Feature Notes

Zone Controller
Master and Slave types
Features new this issue are in RED text

ZON / PTR / LCD /... / ...(master types)
ZSL / PTR / LCD / .../ ... (slave types)

Main Features

Controls Space Temperature in a Zone

Optimum Start and Stop Control

User Interface for any type of plant

Engineering Display for Commissioning

Summary Features

General

Large Clear Display shows System Status and Current Settings
Settings easily made using Dedicated Push Buttons and Rotary Adjustment Knob
2 Time Periods per Day: 7 Days per Week
Special settings for Today and Tomorrow
Holiday Period Feature
Can be used to remotely display values from another module
Can use temperature values from other modules for control
Can be used to supervise the operation of other plant
Condensation control for Chilled Ceilings
Fabric Protection using temperature or Relative Humidity
Can be used to display Alarms from the system
External inputs for remote sensors or Occupancy Override signals

Master / Slave operation

Both Zone Controllers and Slave Zone Controllers are available.
Slave Zone controllers take all of their time settings from a (master) Zone Controller, and hence do not have the relevant time control buttons.
Users may still adjust their temperature setpoints and use the Override & Time Extension features.
Slave Zone Controllers perform their own Optimum Start function independent of the master Zone Controller.
Up to 100 Slaves can be associated with one Zone Controller.

Description of Features

User Display Options

The Zone Controller can be used to display certain other parameters in the system which can be particularly useful to installers and maintenance staff.

 Viewing User Displays

To view user display parameters:
Preset (factory default) parameters are:
1
Room Temperature
ROOM
2
Required Temperature
REQD
3
Zone Control Demand
DMND
4
Outside temperature
OUTS
5
Boiler flow temperature
FLOW
6
Time & Day
MON-SUN
Release button:
To return the display to Room Temperature

Changing User Displays

It is possible to reconfigure two of the user display parameters - Nos 4 & 5 - to read other system parameters than those preset. This can be used to display temperatures from other modules e.g. POOL temperature or DHW temperature.
Put zone into configuration mode and select required parameter on target module by:

To Reset User Displays to Factory Defaults

Confirming the Source of a User Display which is already set up

To confirm where a user display is coming from, put the Zone Controller into config. mode, select suspected target module, turn knob clockwise with select button depressed to locate suspected value, if tick displayed this is the displayed user value. If no tick displayed then value can be updated by pressing the appropriate buttons together (see Changing User Displays).

Remote PV (Process Variable)

The Zone Controller normally uses the Room Temperature either measured by its internal temperature sensor or a remote sensor wired into its terminals as the Process Variable that the Zone will control.
It is possible to use a temperature measurement being made by another module in the system as a Remote Process Variable in place of the Room Temperature. The Zone Controller accesses this information from the other module over the communications network.
The Zone Controller will then display the new value and 4-character label (e.g. POOL from a Pool Controller or HW T from a DHW Controller)in place of the ROOM temperature.
To set Remote Process Variable:
Note this variable must be a measured temperature parameter. Do not try to use a remote setpoint as a Process Variable by this process.
Be careful if using the Zone Controller to perform the control of the temperature, because the Zone Controller Fuzzy Logic constants are set assuming a slow moving Room temperature and may not cope well with a fast changing temperature.
Alternatively, this feature may simply be used to remotely display an appropriate value (if, for instance the Zone Controller is being used to set Return Air Setpoint in an AHU Controller using Setpoint Supervision, then the measured temperature RTNA from that module should be displayed on the Zone). In this case, the HTSC and CLSC parameters in the Zone Controller should be set to zero, to disable spurious Energy Demand signals to other modules (because the control is being done by the AHU module, not the Zone).
See also Temperature Sensors and Occupancy Inputs for details of Networked Temperature Sensors.

Temperature Control

Optimum Start (OPST)

The Occupation Time periods define the times that the building or zone will be to temperature and suitable for occupation.
The Controller will bring on the heating services or HVAC system for a boost period before the beginning of the occupation period to bring the building to the required temperature. The boost period is varied depending on both the zone temperature and the outside temperature in order to bring the zone just up to the required temperature by the beginning of the occupation period. This feature is known as optimum start. By changing the boost time, energy is saved as the plant does not run longer than actual conditions require, the Zone Controller adapts the parameters in its optimum start algorithm so it learns the characteristics of the building and of the services plant.
The Zone learns different characteristics for heating and cooling modes because the plant will have different characteristics in each mode.
Two Parameters can be adjusted to affect Optimum Start; MXOS is used to limit the length of the boost period. With undersized plant, it may not be possible to reach the Occupied Setpoint on very cold days without an excessively long boost period, so the length of the boost period may need to be limited.
The OPTE parameter may be used to allow the Optimum Start algorithm to aim for a setpoint lower than the Occupied Setpoint; this is useful where a step change in heat gain occurs at Occupancy Start, due to lots of people entering the space (e.g. schools) or equipment being turned on. The use of the OPTE parameter can prevent temperature overshoot under these conditions.
During the Optimum Start period the figure on the display jumps in and out of the house.

Optimum Stop

The services for a zone can often be turned off before the end of occupation without the temperature falling outside acceptable conditions. The optimum stop control algorithm calculates how long before the end of occupation the services can be switched off based on zone temperature, outside temperature and its learned characteristics of the building.
The maximum optimum off period is preset to 2 hours configurable by MXOF. Setting the parameter of 0 disables the optimum off function which is the preset. Note that the optimum off function turns off the heating or cooling only . Fresh air and ventilation plant would continue to run until the normal end of the occupation period. The target temperature for optimum off can be offset from the Required Temperature by setting the configuration parameter SBDB - preset to 0°C.
During the Optimum Stop period the figure on the display flashes ON and OFF inside the house.

Required Temperature

The Zone Controller normally displays the Room temperature.
To View and Change the Required Temperature
The Required Temperature is preset to 20°C; to change the Required Temperature rotate the knob more than one click. Clockwise to increase, anti-clockwise to decrease.

Intelligent Setpoint

The Zone Controller has a number of functions that limit the adjustments that the user can make to the temperature in order to ensure comfort and energy efficient operation are maintained.

Setpoint Adjustment Limit

Changes that can be made to the Required Temperature using the knob are limited to 2degC at a time (the adjustment limit) to prevent users unthinkingly making large adjustments that would impair the energy efficiency of the system. After a few minutes the Required Temperature can be altered further. The adjustment limit is a configuration parameter SPAJ which is preset to 2°C

Adjustment Range

The total Adjustment Range of the Required Temperature is limited to prevent it being set to unacceptable conditions. The Adjustment Range is preset to 5°C about the range midpoint temperature which is preset to 20°C. The Adjustment Range and Midpoint can be set by configuration parameters, SPRG & SPMD.

Required Temperature Reversion

At the beginning of each day the Required Temperature reverts to its Default value so that any changes made the previous day are lost and the control returns to an energy efficient default. The Default temperature can be configured to be anywhere within the Adjustment Range and is preset to 20°C (configuration parameter SPOC). The Required Temperature Reversion feature can be disabled by setting the configuration parameter SPDF to zero.

Heat - Cool Control

The Zone Controller has the ability to control cooling as well as heating and can work through separate plant and actuator controllers for both heating and cooling.
It is normal to set a dead band between the heating and cooling functions to allow the temperature to float between the two modes which will improve energy efficiency. The dead band is configured by the SPDB parameter. It is preset to 0 which disables the cooling control loop. Setting between 1 to 10°C enables cooling control and sets the cooling dead band.

It is sometimes desirable to switch off the cooling control without loosing the deadband setting. This can now be done by changing the value of C84 ENCL ENable CooLing, this needs to be set to 1 to enable the cooling function. Note the code automatically sets this parameter if the deadband setting is set/changed to a non zero value.

Fabric Protection - using Temperature

During the occupation period the Zone controls to the Required Temperature. Outside the occupation period, the zone will bring on the services if the temperature falls to the Fabric Protection Temperature in order to avoid condensation forming.
Once the Fabric Protection algorithm has been initiated it will bring the temperature up by the Fabric Rise Temperature in order to avoid the plant cycling ON and OFF. The Zone remains in this mode until the temperature has risen by the amount specified by the parameter FRSE at which point the Zone Controller reverts to non-occupied setpoint as before. If a stable temperature is required during non-Occupancy (e.g. night setback for a nursing home) then FRSE can be left set to the factory default setting of zero.
The Fabric protection temperature is a configuration parameter SPNO and is preset to 10°C.
When the Zone is running the plant in Fabric Protection mode a snowflake symbol appears on the display.

Fabric Protection - using Relative Humidity

If a Networked T+RH sensor is registered to the Zone Controller, the Humidity value may be used for Fabric Protection; the Zone Controller can be made to bring on the heating to prevent RH levels rising above a predetermined level.

The Humidity reading can be read from another module by setting the controller to receive the RH value on USR1 or USR2 values, see above and then setting C149 RHPV to 1 or 2 to indicate which parameter contains the RH value.

The desired maximum RH level is set on parameter SPRH (Rh setpoint); setting a non-zero value will enable RH Fabric Protection
If the RH is below the RH setpoint, the Zone will control to its normal non-occupied setpoint (set on SPNO) as for temperature-based Fabric Protection. As the RH in the space rises, the Zone Controller will increase its current setpoint (which can be read on Monitoring Parameter REQD) at a maximum rate of 0.1 degC per minute according to an integrating control action. As this temperature setpoint exceeds the current temperature in the space, so the heating will be enabled, raising the temperature and thus reducing the Relative Humidity. The temperature setpoint is limited to the normal Occupied setpoint for the zone (set on SPOC) thus providing a high limit for space temperature.

Frost Protection

The Zone Controller is made aware of the Frost protection status of the Boiler Controller. If the Boiler is in Frost protect this is communicated to the zones which will display the frost symbol and open any registered actuators to 50% and start any optimum start/stop switched loads. The Zone remains in non-occupied (man out of the house) to distinguish this mode from Fabric Protection.

Two Pipe Control

When used in conjunction with Heat Source HSCVT4d1 or later as its Heat Source the Zone Controller now allows for Two Pipe heating and cooling. This Heating Secondary Controller must have a temperature sensor connected to the Flow side of the two pipe system so that it can broardcast the medium temperature to all it's registered consumers. The 4d1 range of secondary controllers also allows for interlocks between heating and cooling versions so that the meduim can be controlled.
A new configuration variable TPSL Two Pipe SeLect must be set to enable this feature, two modes are available. (The minimum output feature MNOP has been removed) Remember the SPDB SetPoint DeadBand also needs to be set to enable the cooling control. The Zone Controller will display the medium Flow temperature from its Heat Source on the FLOW display.
Two Pipe Mode 1: mixed actuators
With TPSL Two Pipe SeLect set to 1, the Heating demand to the actuator controller will carry the Cooling Demand if the meduim temperature at least 1 degree less than the controller mid point setpoint. Normal Heating is resumed if the medium Flow temperature is at least 1 degree above the controller mid point setpoint.
Two Pipe Mode 2: intelligent actuators
With TPSL Two Pipe SeLect set to 2, heating and cooling demands are sent to standard Actuator controllers as normal. A new output signal is sent to all intelligent actuators registered to the controller, this demand will be for cooling if the meduim temperature at least 1 degree less than the controller mid point setpoint, and will be for heating if the medium Flow temperature is at least 1 degree above the controller mid point setpoint.
The new demand does not use the normal Heat or Cool demands to the intelligent actuator so the heating/cooling selection on the IA is not important.
The Zone Controller will display the medium Flow temperature from its Heat Source on the FLOW display.

Occupancy Control

Time Schedules

The user can set the times that the Zone is to be used - called occupation periods - by setting the time schedule. This allows 2 occupation periods per day and different settings for each day of the week.
Preset times are

System Clock

All Zones share a common system clock function so on multi zone systems it is only necessary to set the clock and day on one zone - all the other zones will receive and use the updated time and day.

The Real Time Clock (RTC) is located in the System Housekeeping Module and this module broadcasts the time information over the network every minute and this is received and used by all modules that require this information. If the Zone Module fails to receive the time update - (for instance if the System Housekeeping Module is disconnected or is in configuration mode when it will not communicate) then the zone will automatically switch to use its internal software based clock until the time signals are restored.The Zone Controller alerts the user by bringing an X symbol in the lower part of the display when it is running on its software clock.

Setting the System Clock

To Set Current Time

To Set Current Day

Setting the 7 Day Time Schedule

Select the Day to be changed
View and adjust time periods

To skip an Occupation Period:

The controller will skip an occupation period if the start and stop times are set the same. The default times are to skip the second occupation Monday to Friday preset to 24:00 and both periods Saturday & Sunday preset to 00:10.

Copy Feature

Having set the occupation periods for one day they can be copied to other days of the week using the copy facility
The occupation times have been copied, from the initial day to all the days, including the final day in the sequence. The copy process can go both forward (Mon to Fri) and back (Fri to Mon) depending on which way the knob turned.
The variable display shows both the initial day and the final day in the sequence as day number 1 - 7, Monday is day 1 and Sunday day 7, so copy from Monday to Friday and the variable display will show 01:05

Today & Tomorrow

The time periods for today and tomorrow can be set to be different from the normal 7 day time periods but they are volatile and the system will revert to the normal 7 day time periods when they are over. This is useful for unusual events (e.g. late working, or early starts) which are not repeated every week.

To set times for today and tomorrow

Override

Occupation Status is shown on the display During an occupied period, the figure is in the house, outside occupation the figure is outside.
The user can Override the Occupation Status using the Override Button that appears through the flap on the front of the controller.
The way the Override works changes depending on the periods of the day when override is used.
If used before the beginning of either Occupation period in the day, then the zone will be Occupied until the end of that Occupation period. If Override is used when the zone is Occupied, then the unit will switch to non Occupied until the start of the next time period. If Override is used after the end of the Occupation periods then there will be a timed extension to the Occupation period. This extension period is preset to 1 hour but may be changed by using configuration parameter XHRS.

Switch 3 Master Override MOVR

When set any change in the Override settings initiated by pressing the Override button on the Master controller will be sent to all Slave Zones. The Slave Zones must be issue 4c or later for this to work. This feature is only available on Master Zone Controllers.
If the Slave Zone is time slaved to a Master Zone Controller which has MOVR Master Override set, then changes to the Override state of the Master will be reflected in all the slaves controlled by that Master.

Holiday

The Zone Controller can be set to Holiday Mode which is the number of days holiday period starting from the following day. Occupation periods can be set for holiday (for cleaners etc.); the preset value is for no occupation period.
To set Holiday Occupation period

To set Holiday Mode

When Holiday Mode has been set (but is not active, i.e on the last working day) the display will indicate this by showing a flashing “Suitcase” symbol. When Holiday Mode is active, the display will show steady “Suitcase” and flashing “Seagull” symbols.
If the holiday setting is set to zero, either from Doorway or by using the holiday button and the knob, the holiday mode is cancelled. If the Holiday process is active, suitcase and seagull displayed, then the standard occupation pattern is loaded for today otherwise the current today's times are retained.
If switch 4 MHOL Master Holidays is set then any change to the holiday settings, at the controller or via Doorway will result in these settings being sent to all Zone Controllers and DHW controllers on the whole system. It is advisable to only activate this feature on one controller on the system. Similarly setting HDAY to zero when MHOL is set will cancel any Holiday setting throughout the system.
From issue 4c1 the number of days holiday is sent to all slave zones, or to all zones if MHOL is set, this means that the holiday status is now evident at each zone because the 'suitcase' and 'seagull' will be displayed in the same way as on the master zone. Changes to the holiday settings are sent after a 30 second delay, to give the user time to complete and check the change.

Extended Holiday features

The range of the Holiday features when changed from the network has been extended to 500 days also a special value for HDAY -1, displayed as OFF on the Zone Controller, allows the Zone to be put into Holiday (unoccupied) mode for ever. To set this from the Zone hold holiday button and rotate anticlockwise past 0 to OFF. This provides a simple method for Holiday Home owners to shut down the house until their next visit.
Two addtional configuration variables have been added C168 RDAY RunDays and C169 SHOL StartHolidays. The operation of these parameters is quite complicated and it is intended that they are only changed by the Web Server. In essence Start Holidays provides a daily countdown to the start of a non occupied holiday period the length of which is defined by HDAY. RunDays provides for a number of days of normal occupation after which the Zone will become permanently not Occupied. Using these two values and HDAY the WebServer is able to set any length occupied or unoccupied period for any time in the next year.
If trying to recover from miss set parameters set RDAY and SHOL to -1 (OFF) to disable the feature. This can be acheived using the knob by holding down Start 1 & Holiday to adjust SHOL and Stop1 & Holiday for RDAY.

External control of Holiday settings

If SACT is set to 8 then the external contact input is used to set the Controller into and out of Holiday mode. This contact can be wired to a security system or other Home Automation Controller. The logic used allows subsequent setting of expected arival date using the normal Holiday setting.
When the contact changes from open circuit to closed circuit the Holidays setting is changed to -1 or OFF, providing permanent Holiday mode.
When the contact changes from short circuit to open circuit, if HDAY is still -1 then it is reset to 0 No Holidays, otherwise no action is taken. This allows for HDAY to be changed in the intervening period to represent the expected arrival date so that the building can be brought back up to temperature prior to arrival.

Registration

The Zone Controller can be used in several different ways, for Controlling the Zone temperature directly, for supervising other controllers in various ways, or for demanding services from other controllers. Some of these features are mutually exclusive, whilst some can co-exist at the same time.
The various forms of Logical Links between this Zone Controller and other Controllers are made by the process of Registration; a brief description of the process is given below. For a full description, see our CD ROM.

Address Allocation

Before any Registration Links can be made, the Zone Controller must be allocated an address by the System Housekeeping Module. The Register button is pressed; the Zone should display its address; “ZONE1”, “ZONE2” etc.

Submodules

The Zone Controller may have up to 8 Submodules (e.g. Actuator Controllers, Pump Changeover Modules) registered to it. The Zone is put into Configuration Mode and the Submodule is registered to it. This sets up the Submodule’s address (which will be of the form Zn Am , where n is the Zone’s address, and m is the Submodule’s address).
The registration process also makes Control Demand links between Zone and its Submodules, so that they will respond to Occupancy and Heating/Cooling demand signals from the Zone as appropriate.

Networked Sensors

The Zone Controller may have a Networked Sensor registered to it; either a Condensation sensor, a Networked Temperature sensor, or a Networked Temperature + Relative Humidity sensor. Only one sensor may be registered to a Zone. The Zone is put into Configuration Mode and the Sensor is registered to it.

Demand Links

These links are Many-to One links made from this Zone (and perhaps many others) to a Module that is providing a service to the Zone (provision of Fresh Air, Energy or Domestic Hot Water services). They can each exist with any other links simultaneously.

Occupancy Demand

The Occupation state of the Zone can be passed to an AHU or DHW Controller using Occupancy Demand linking; this is for plant which provides a service for many zones (e.g. Fresh Air plant). The Target Module is put into Configuration Mode, and the Zone register to it. This sets up the Occupancy Destination parameter OCDS to “point” the Zone’s Occupancy Demand at the target, which will then run when the Zone (or any other Zone thus registered) is in Occupancy. Occupancy Demand linking can be used in conjunction with any other links at the same time.

Energy Demand

The Zone Controller can send its Energy Demands for Heating and Cooling to another Module (a Distributor Module, like a Secondary Circuit Controller or Provider Module like a Boiler Controller) if that Module is responsible for providing energy to the Zone. The Distributor/Provider Module is put into Configuration Mode, and the Zone is registered to it. This sets up the HTSC and CLSC parameters in the Zone to “point” the Energy Demands at the appropriate Modules. Energy Demand linking can be used in conjunction with any other links at the same time.

Supervision Links

These links are One-to Many links made from this Zone to one or many other Modules. The Zone Controller will supervise the behaviour of these other modules in some way; either their Setpoint, Occupancy Status (i.e whether they are On or Off) or their Time Schedules (so that they can still perform their own Optimum Start and Fabric Protection). The Zone Controller can only have one of the 3 types of link with any given Module, but it may have links of each type with several different Modules concurrently (e.g. it can supervise the Setpoint in an AHU Controller, and send Occupancy Times to a Slve Zone Controller at the same time)..

Setpoint Supervision:

The Zone Controller can be used to transmit its Setpoint to another Module (e.g. an AHU Controller) or to many other Contollers (e.g. Fan Coils).
Parameters in the Supervised Modules will need to be set (typically their SPTY parameter -see appropriate Data Sheets for details).
The SLVM parameter in the Zone must be set to 2 or 3 (a setting of 3 will allow the Zone to also send Occupancy Times to a different Controller). The Zone Controller is put into Configuration Mode, and the target Controller(s) are registered to it. This Setpoint Master-Slave link will be confirmed by “SLVE” (for Zones, Fan Coils etc.) or “SAHU” appearing in the Zone’s display.
AHU Controllers thus supervised would normally run to the Zone’s setpoint during Occupancy, and will turn off during Non-Occupancy. If it is desired to run the AHU during Non-Occupancy (i.e for 24 hours) but at a different setpoint, the parameter NOSV may be used ; if set to a non-zero value, this will keep the AHU running at the desired setpoint.

Occupancy Supervision:

The Zone Controller can be used to transmit its Occupancy Status to many other Contollers (e.g. Fan Coils). This mode of linking can be used instead of Setpoint Supervision to drive Fan Coils on and off, but leave them controlling to their own setpoints. The Zone Controller will be responsible for Optimum Start and Fabric Protection.
Parameters in the Supervised Modules will need to be set (typically their SPTY parameter -see appropriate Data Sheets for details).
The SLVM parameter in the Zone must be set to 2 or 3 (a setting of 3 will allow the Zone to also send Occupancy Times to a different Controller). The Zone Controller is put into Configuration Mode, and the target Controller(s) are registered to it. This Setpoint Master-Slave link will be confirmed by “SLVE” (for Zones, Fan Coils etc.) or “SAHU” appearing in the Zone’s display.

Time Schedule Supervision:

The Zone Controller can be used to transmit its Occupancy Time Schedules to many other Contollers (e.g. Slave Zone Controllers). This mode of linking can be used instead of Setpoint Supervision to set Occupancy Times but leave them controlling to their own setpoints, and performing independent Optimum Start and Fabric Protection for their parts of the building.
Parameters in the Supervised Modules will need to be set (typically their SPTY parameter -see appropriate Data Sheets for details).
The SLVM parameter in the Zone must be set to 1 or 3 (a setting of 3 will allow the Zone to also send Setpoints to a different Controller). The Zone Controller is put into Configuration Mode, and the target Controller(s) are registered to it. This Setpoint Master-Slave link will be confirmed by “SLVE” (for Zones, Fan Coils etc.) or “SAHU” appearing in the Zone’s display.

Temperature, RH and Occupancy Inputs

Conventional Thermistor Sensors

The Zone Controller (type /001) is fitted with its own internal temperature sensor which is used as the measured temperature to be controlled.
The unit can be connected to a remote temperature sensor which is a conventional, low cost thermistor type for applications where it is inappropriate to locate the Zone Controller in the area to be controlled because it may be tampered with. The Zone Controller is preset to switch control to the remote sensor if one is fitted but the sensor action parameter SACT can be set so the controller uses the higher, lower or average value of the two sensors. If one sensor fails the control will continue on the other sensor alone.
A version (/003) of the Zone Controller is available without an Internal Temperature sensor but with the ability to use 2 remote sensors. This is useful to provide freedom of location of sensors and to allow two measurement points in a larger space.
Because they are standard 10K ohm thermistors, 4 can be wired in series/parallel configuration to provide electrical averaging of 4 sensors. Thus up to 8 sensors can be wired to a Zone Controller.

Intelligent Networked Sensors - Temperature

A SeaChange Intelligent Networked Temperature Sensor (which has its own Microprocessor and derives its power from the network) may be registered (as a Submodule) to the Zone Controller. The Zone will display SEN1 when the device is registered. This type of sensor has the advantage that it may be located anywhere on the network, and so may provide installation benefits because an additional cable may not need to be run between the Zone and the sensor. The parameter SACT must be adjusted accordingly to make the Zone Controller use the Networked Sensor value as its Process Variable in place of its own thermistor. Control will revert to the local thermistor if the Networked Sensor reading is invalid.
Unlike the feature Remote Process Variable, (described under User Display Options) where the Process variable is obtained from another Controller Module, here the value is coming from a Sensor Submodule, so the Zone Display will still read “ROOM”.

Intelligent Networked Sensors - Temperature + Humidity

A SeaChange Intelligent Networked T + Rh sensor connected somewhere on the network may be registered (as a Submodule) to the Zone Controller. The Zone will display SEN1 when the device is registered. The parameter SACT must be adjusted accordingly to make the Zone Controller use the Networked Sensor Temperature value as its Process Variable in place of its own thermistor. Control will revert to the local thermistor if the Networked Sensor reading is invalid.
The Relative Humidity may be used for Monitoring only, or it may be used for enhanced Fabric Protection using Rh control - see Fabric Protection.

Send own Temperature SNDT

When a Zone Controller is registered to an AHU controller which is set to SPTY 2 then the Zone's temperature reading may be used as the Return temperature reading for the AHU. The AHU might have many Zones registered and might also be using an intelligent TRH sensor for its Return temperature reading. To allow for these cases the Zone code has been changed so that sending the Zone temperature needs to be enabled at the Zone using configuration value SNDT. Do not set this if a) the AHU is using TRH sensor for Return Temperature or b) if multiple zones are registered to the AHU only set SNDT on one representative Zone. If you see the Return temperature cycling between one or more values then check SNDT on any registered zones. SNDT is 0 (OFF) by default.

If the zone controller has a T_RH intelligent sensor registered to it and SNDT is set both the Temeprature and RH value will be sent to the AHU as the Return Air values.

Sensor Action

The parameter Sensor Action SACT allows considerable scope for combining internal, external and networked sensor values. The min, max and average options will use all the sensor values which are valid so for example the minimum value would be the minimum of the in-built sensor, an external hard wired sensor and a networked sensor if all were being used and were presenting valid readings.

Sensor Calibration

The sensor calibration can be trimmed using the SCAL parameter. This provides a fixed offset to the temperature measurement and applies to the resultant temperature - after selection of remote, average, etc. functions using SACT parameter. Sensor calibration is preset to 0°C.

Switch Inputs

Remote Occupation Status Input

A Volt-Free Contact (VFC) may be wired to the external input connections to provide external control over the Occupation Status of the controller.

Occupancy/Non-Occupancy Switching

The remote temperature input connections can be configured by SACT to be a remote input to provide occupation override. This uses a contact closure (volt free contact) to drive the zone into the occupancy state if it currently is not occupied but will not alter the occupancy state if the time schedule etc., has already put the zone into occupancy. This feature can be used to drive a zone into occupancy using an input from a simple switch, another item of plant, or a Presence Detector or Card Access Controller. Note that any timed on period should be part of the presence detector function, the Zone Controller will revert to Non-occupied directly the signal is removed.
A new setting SACT 7 has been added which tests for normal Zone Occupancy AND an external signal to be available for the Zone to enter Occupation. This allows override OFF for non occupied periods to be set with a switch or interlocked with other equipment in the panel.

Occupancy/Standby Mode Switching

The remote temperature input connections can be configured by SACT to be a remote input to provide Occupation/ Standby Mode switching. This uses a contact closure (volt free contact) to drive the zone into the occupancy state if it is currently outside of its Occupation Times. If the Zone is in its normal Occupancy period, with the external contact open circuit, it will be running in Standby Mode (i.e with a wide deadband set on parameter SBDB).
When the external contact closes, the Zone will be driven into its normal Occupation Mode (with a normal close deadband set on SPDB). This feature can be used to drive a zone into occupancy using an input from a simple switch, another item of plant, or a Presence Detector or Card Access Controller. Note that any timed on period should be part of the presence detector function, the Zone Controller will revert to Non-occupied directly the signal is removed.

Condensation Control

The Zone Controller can control condensation in Static Cooling (Chilled Ceiling and Chilled Beam) installations, where condensation can form on the cold surfaces of the ceiling if the ceiling temperature is allowed to fall below the dewpoint of the surrounding air. This phenomenon is sometimes refererred to as “Office Rain”.
A SeaChange Intelligent Networked Condesation Sensor must be registered to the Zone Controller (the sensor can be connected anywhere on the network). Upon registration, the Zone Controller will display “SEN1”.
If the Condensation Sensor reports a condensing condition, the Zone Controller will progressively ramp down its Cooling Control demand signal, and hence start to close down any registered Actuator Submodules, which would be controlling the Cooling Valve on the Chilled Ceiling. An alarm can also be generated; see Alarm Handling and Display.
As the condensing condition clears, the Zone Controller will resume normal control; thus a simple form of local Dewpoint Control has been created. The Controller will allow the Chilled Ceiling to run as cold as possible whilst preventing condensation, which will ensure that the maximum possible cooling output is derived from the ceiling.
If the Condensation Sensor fails to respond or becomes disconnected during a condensing event, the Zone Controller will recover normal operation within 7 minutes, until the sensor is re-connected.

Alarm Handling and Display

The Zone Controller can generate alarms, and can also respond to alarms sent by other Controllers. If it receives an alarm, it can be set to take some control action, display the alarm, or both.

Alarm Generation

The Zone Controller can generate 3 different alarms, which can be reported at Doorway Supervisor, or on the display of this Zone Controller (see below).

SENF
Alarm is generated when the sensor reading is outside of the allowable range

RPVF
Alarm is generated if the Controller is set to use a Remote Process Variable from another controller in place of its own sensors, and the Variable is not being received across the network

CNDF
Alarm is generated when a Condensation sensor registered to this Zone has detected condensation.

Alarm Control Action

The Zone Controller can be set to react to alarms in different ways; the ALRM parameter can be set to ignore alarms, to report alarms but take no Control Action, or to shut down its Control Demand output (and hence any registered Submodules’ outputs, e.g. Actuator Controllers) - either because of an internal alarm, or because a System STOP alarm has been received.

Alarm Displays

The Zone Controller can be set to display alarms if required. The setting can make the Zone display only its own alarms, or alarms from any other Controller on the network.
The parameter AMON when set to a non zero values enables the Alarm Monitoring feature. The controller stores the first 10 Controllers which report alarms and the display flashes “HELP” and the current number of Controllers which have reported alarms, alternating with the normal display (usually ROOM and the temperature value). If the Alarm is generated by the Zone controller itself then the display will show the Alarm label instead of HELP.
Pressing override acknowledges the alarm and the display reverts to normal except that the screwdriver symbol continues to flash until the alarms clear.
This feature has been developed to provide simple alarm indication on small systems so that the occupants can alert their maintenance company that there is a fault. Alternatively it can be used to show sensor fail or condensation imminent for just the zone affected.

Accessing Configuration and Monitoring Parameters

Configuration Parameters are used to adjust settings from their factory defaults; Monitoring Parameters are mostly used to monitor internal readings (such as temperature readings) during the Commissioning process.
This Module’s Parameters may be viewed, and in the case of some parameters, adjusted by one of two methods; Either by using the Zone Controller’s own buttons and display, or by using the SeaChange Doorway Supervisor. The Zone Controller may also be used to view parameters in any other Module on the network.

Using the Zone Controller

Note: Once you have selected another controller to view, you can select another controller (by pressing its Select Button), but you cannot “deselect” all other controllers in order to return to viewing the Zone’s own parameters. In order to do this, exit from Configuration Mode (press Select and Override briefly) then start again at step a) above.

Using SeaChange Doorway:

Data Points may be added to a Doorway page to access/adjust any Configuration or Monitoring Parameter. Graphs of certain Parameters are also available. The code used to access a Boiler Controller is Zn ,where n is the Zone’s address number. The code for each parameter is shown in the Config Tables.
Further details of how to set up Doorway pages may be found in the SeaChange Doorway Manual, or in the online help facility supplied with SeaChange Doorway.
The PC running SeaChange Doorway can be connected locally via a Serial Adaptor Module, or remotely using standard High-Speed Modems; all Parameters can thus be monitored and adjusted remotely.

Switch 5 Manual Hand control HAND

When set, the controller output will be determined by the value set on the configuration parameter MANL. This may be changed between -100 full cooling output and +100 full heating output. This feature allows known demand levels to be setup to check that all the relevant demand links have been correctly made.
To activate put the controller into to configuration mode, hold the select button down and rotate the knob clockwise until the switch HAND is displayed. Hold down the Override button and set HAND equal to 1. The controller will automatically exit configuration mode and display the MANL parameter which may be set using the override button and the knob. If it is important that a predetermined manual level MANL is used at the start of HAND mode, select and change the Configuration variable MANL before setting the switch HAND.
While in Manual Hand Mode the status led will fast flash and the Zone controller will only display MANL and the demand value. The value may be adjusted by holding down override and turning the knob. To exit Manual Hand Mode press select and override together.
Using Doorway add a point with the following syntax
[Z1]W5(S)/hand/auto/12/10/C83(V)
This will normally display as auto, when clicked a dialog box will appear which will allow hand to be selected and the level adjusted, the point will change to hand when the controller is in Manual Hand mode.

Options and Product Codes

Zone Controller

ZON / PTR / LCD / [option] / [colour] (master types)
ZSL / PTR / LCD / [option] / [colour] (slave types)

Options

Option
 
/ 001 /
With internal sensor, provision for 1 remote sensor or override device
/ 003 /
With no internal sensor, for use with 2 remote sensors or 1 remote sensor and an override device

Colour Options

Option
 
/ G
Grey housing
/ W
White housing

 

 

Input Configuration
Input 3-4
Remote sensor or external VFC override (optional)
Input 5-6
Remote sensor (optional, for / 003 types only)

 

ENER-G Controls

ENER-G House
Daniel Adamson Road
Salford
Manchester
M5 2DT

phone 0161 7457450
fax 0161 7457457

www.energ.com
www.seachange.co.uk
www.smartkontrols.co.uk