Summary Features

The Room Controller is a version of the Slave Zone Controller that has buttons behind the flap to manually set the fan speed on multispeed fan coil units.

The unit has buttons for Auto, Off, and Fan Speeds 1, 2 and 3.

In Auto mode the Fan Coil will control its fan speed automatically depending on load. Pushing the fan speed buttons 1, 2, 3 manually selects that fan speed. Off turns the fan and the unit off.

The Room Controller will work with up to 8 multispeed fan coil controllers.

Used in Hotel applications the Room Controller may be enabled and disabled from a PC running SeaChange Doorway at the Front Desk.

The Room Controller has three states:

Occupied, when the fan will be running and Temperature controlled to a narrow deadband set by the SPDB parameter.

Standby, when the fan is running and the Temperature controlled to a wide deadband set by the SBDB parameter.

Unoccupied, when the fan is off unless the temperature dips below the Fabric Protection setpoint parameter SPNO.

When switched from Standby to Occupied mode using Seachange Doorway, the Fan Coil will be set to Automatic Fan Speed (starting in ‘boost’ at fan speed 3 in order to achieve the required temperature quickly) and control to a default setpoint SPOC.

The user may make changes subsequently using the buttons and knob; when the controller is taken out of Occupancy and back in all the adjustments revert to default settings.

The unit is Wall mounted on a standard wall box and is of two part plug in construction

Description of Features

Hotel Room User Interface
 
The controller has a modified user interface for use primarily in Hotel Rooms with FCU-DIN-7R Multi-speed Fan Coil Controllers.  Details of these changes are as follows:

• 'select' button becomes 'auto', pressing this selects automatic fan speed control and puts the controller into 'occupied'
• 'override' button becomes 'on/off' toggles between 'occupied' and 'non-occupied'. When 'non-occupied' fan will be stopped. ( Note non-occupied could mean 'standby' if room is let)
• First three buttons on top row now control fan speed, '1', '2', '3'. Numbers will match the display and are more internationally recognised.
• Doorway 'switch 3' becomes "RLET" room let, when set from the front desk this puts the Controller into 'occupied' and the fan speed to auto.
• Doorway 'switch 4' becomes "STBY", when set this puts the room to 'standby' which brings on the control but with the deadband increased to the sum of Occupied deadband and Standby deadband. This will allow the front desk to get rooms to an acceptable condition from the time they are 'booked'.
• If both 'switch 3' and 'switch 4' are off the room is 'non-occupied', pressing the 'on/off' will only give 20 minutes run time, for testing or cleaners.

The Controller is designed initially to work in conjunction with the Fan Coil (FCU-DIN-7R) controller. This will take demands Heat%, Cool%, FanSpeed% from the Room Controller and control the 'off coil' temperature from the fan coil. If no sensor is fitted or it fails then the Actuator FanCoil will revert to controlling directly from the Room Controller demands.

Occupation Times
This controller does not support Occupation times, it is assumed that the controller will be set from the Front Desk or by the Occupant of the Room. The Room can be put into Room Let (switch 3) or Standby (switch 4) from Doorway. When the Room is put into LET mode then the setpoints are reset to the default values, in the same manner as at start of occupation for a standard Zone Controller.

Default Display
A configuration variable defines the display the the User sees, because the normal select button is used for 'auto mode' the display is essentially 'fixed'. Config variable DISP set to 1 displays the ROOM temperature, set to 2 displays the REQD temperature.

Fan Speed Control
When auto is selected, status led on and not pulsing, the Fan speed is controlled by the Room Controller based on the demand levels on the control loops. There is a minimum time delay of 5 minutes between automatic changes of fan speed. (Note on first power up the delay on full demand will be about 10 minutes to move to stage 2 because it takes time for the averaging routine to build up its stored value.)

Increasing Fan Speed
If the average demand for heating or cooling exceeds 90% and the minimum change time has been exceeded the FanSpeed is increased by one step.

Decreasing Fan Speed
If the average demand for heating or cooling is below 10% and the minimum change time has been exceeded the Fan Speed is decreased by one step.

When the Room is changed from EMPTY to LET (from Doorway) the fan speed is set to 3 and automatic fan speed control is selected. The equivalent can be acheived at the Zone Controller by selecting fan speed 3 then selecting auto. Automatic control of fan speed will commence with the selected speed.

The configuration parameter FNMD Fan Mode can be set to alter the operation of the automatic fan control, it has no effect in manual mode.

Standby Mode
In this application it is intended that 'standby' is selected from the Front Desk using Doorway (switch 4), however the standard external method is also available. Note the default settings for Occupation deadband and Standby deadband are 1.0 and 2.0 deg C for this product.

External Deadband Control
An additional option for sensor action SACT 6 allows the use of the external input for deadband control. If the zone is occupied and the external input is open circuit then the control loops will work to a deadband of setpoint deadband plus standby deadband, when the external input is short circuit the deadband becomes equal to the normal setpoint deadband. The external input will still force the controller into Occupation as for SACT mode 4 described below. When in Standby mode the man will flash in the house and the REQD setpoint display will display the current setpoint. Adjusting the setpoint with the knob will change the Normal Occupied Midpoint as normal.

Degrees Fahrenheit
The displayed units can be selected with a new config variable DEGF, setting this to a 1 selects F displays. If the module the Zone Controller is getting information from is running software earlier than 3cx then no units data is displayed and the values will be displayed in C.

Fabric Protection
A config variable allows a more rigorous fabric protection routine to be used. If the Zone measured temperature falls below the non-occupied setpoint then the Zone switches to 'fabric protect mode' the zone becomes 'occupied' and the frost symbol is displayed. Upstream plant which is being signalled using HeatTrim will come on as if for normal occupation. AHU and Fan Coils which are being controlled using Occupancy method can be prevented from starting with the use of OCCO occupation only config variable. The Zone remains in this mode until the temperature has risen by the amount specified by the new config variable FRSE fabric rise, at which point the controller reverts to non-occupied. If FRSE is set to zero the controller will control to the non-occupied setpoint as before.

Frost Protect
The Zone Controller can now be made aware of the Frost protection status of the Boiler (or other heat source). 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 OSS switched loads. The Zone remains in non-occupied (man out of the house) so this mode can be distinguished from Fabric Protection.

Networked Sensor
The controller can now use a networked sensor for it's measured value, the SEN-PR-OUT or SEN-PR-DCT sensor may be used. This is registered to the Zone in the normal manner, the display will show SEN 1. To make the Zone use the networked sensor in preference to the internal sensor set SACT =5. Note this can be used as a method of testing SEN-PR-OUT when on site.

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.

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.

Occupation Output for AHU's
An additional network variable which passes the Occupation state of the Zone has been added. This variable in conjunction with OCDS occupation destination allows the occupation status of many zones to be passed to a common Air Handler, see AHU notes. This output can also be used with DHW Controllers from issue 3c1 onwards.

Alarm Support
The controller supports

• Sensor Fail the connected sensor is reading outside the allowable sensor range
• Remote PV fail the controller is set to use a networked value for the processed variable but this value has stopped being updated
• Condensation Alarm a condensation sensor is registered and indicates that condensation is in progress.
• STOP alarm received from system and being acted on

Alarm mode and Alarm State and Alarm Monitoring config variables have been added to the config variable list.

Alarm Mode ALRM

Alarm state ALST not used at present.

Alarm Monitor AMON

This parameter when set to a non zero values enables the Alarm Monitoring feature. The controller stores the first 10 nodes which report alarms and displays HELP and the current number of nodes which have reported alarms. If the Alarm is generated by the Zone controller itself then the display will show the Alarm label instead of HELP. The scope of the Alarms which are reported is controlled by the setting of AMON.

There is no method of displaying which alarms are present, for this an Alarm Monitoring controller must be used. 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 for just the zone affected.

Remote Processed Variable / User Displays
User displays are not supported on this version of the Zone Controller

External Source for Occupation State
Support has been added to allow the Occupation state of a zone controller to be determined by an external input. To activate this state set sensor action SACT to 4 and wire the external signal (volt free contact only) to the remote sensor terminals. A closed contact will force occupation. This has been implemented as an OR function with our in-built time schedules so this feature could be used as a secondary function say from a PIR sensor or sound sensor in addition to occupation periods set on our 'occupation times'. If the external source is to be the only occupation signal then disable the inbuilt time schedule by setting all days to no occupation. The state of the external signal can be monitored at dig input 8 (I8) XOCC. If a remote temperature sensor is also required, modified hardware 0003/0003, with the internal channel wired out will have to be specified..

Additional configuration variables

Override extension time XHRS
This is used to set the run time used for cleaning or testing when the room is not LET and not in STANDBY. The default setting is 0.5 hours.

Occupation destination OCDS
The parameter OCDS occupation destination is used in conjunction with AHU Fan Coil and DHW controllers more details above.

Occupied and non Occupied setpoints
These are now available as config variables, the Occupied setpoint can be changed within the limits defined by setpoint mid point SPMD and setpoint range SPRG. SPMD range has been extended to allow setpoint supervision of DHW controllers, note this is now set as integer degrees. The non occupied setpoint can be set anywhere within the allowable setpoint range which has been increased to 5-95C.

Standby deadband SBDB
This defines an additional amount of deadband to be applied when the controller is in 'standby mode'

Heating Constant temperature HTCT
This parameter if set to a non zero value defines that the controller should send a CT setpoint instead of the normal percentage demand. The value set is the Constant temperature value which will be sent to the Heat Source.

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.

This feature will be added to all SeaChange controllers as they are all updated to issue 4c, more information here.

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

Accessing Configuration and Monitoring Parameters
Configuration Parameters are used to adjust settings from their factory defaults; Monitoring Parameters are used to
monitor internal readings (such as temperature readings) during the Commissioning process.

The Parameters may be viewed, and in the case of Configuration Parameters, adjusted by one of two methods; either
by using the Zone Controller’s own display, or by using the SeaChange Doorway Supervisor.

Options and Product Codes
Room Controller

ZSL / PTR / LCD / [option] / [colour]

Options

Colour Options

SC Controls Ltd

PO Box313
Wadhurst
East Sussex
TN5 6JL

phone 08707 606040
fax 08707 606041
e-mail seachange@sccontrols.co.uk
http:// www.seachange.co.uk