HVAC SETBACK SYSTEMS
•Occupancy Detection
•Setback Operation
•Door Switch Only Operation
Occupancy Detection
Install jumper JP3.
The T170 can be used with the PECO S200 series occupancy detection equipment. The occupancy and door switch inputs are designed to con- nect to the SB200 slave sensor and SE200 door switch. The Occupancy sensor switch is open when there is occupancy and closed when unoccupied. The Door Switch is open when the door is open and closed when the door is closed. This system requires both an Occupancy Sen- sor and a Door Switch. Operation is as follows:
FROM OCCUPIED MODE:
1.A door close signal initiates an occupancy status detection.
2.If occupancy is detected the T170 will maintain normal HVAC control. It then waits for a door open signal before determining occupancy again.
3.If no occupancy signal is detected within 2 minutes the T170 changes to unoccupied mode and controls at setback values.
FROM UNOCCUPIED MODE:
1.The T170 continually monitors the room.
2.Any occupancy detection, including door open, will set the operation to occupied mode.
In either mode, if the door is left open for more that 2 minutes the T170 will disable the HVAC system. A
In an Occupied State the thermostat operates normally and looks for a door close. In the Unoccupied State the thermostat sets heating and cooling set points to setback values, as determined by factory or user settings. In this mode the fan is automatically set to cycle with demand. The T170 will continue to monitor the occupancy sensor and will go to occupied state anytime occupancy is detected.
Setback Operation
Remove jumper JP3.
This is a low level switch input that is normally open. When closed the T170 Heating and Cooling setback limits are used as temperature control points. Fan operation in setback is cycled with demand. Pressing any button will override setback for 1 hour. Setback will override any user setting except if the control is turned to OFF. Units with a controlled off factory setting will override the OFF setting.
Intelligent occupancy sensors like the
Door Switch Only Operation
Install jumper JP3.
A stand alone door switch can be connected to the T170 to disable the HVAC system if the door is left open for more that 2 minutes. A
CONDENSATE OVERFLOW INTERRUPT
The remote probe input can be used with a condensate overflow switch (CO), either in conjunction with a remote probe (normally closed CO switch) or with local sensing (normally open CO switch). When con- densate switch activates, the T170 will display the service wrench and disable all outputs.
Local Sensor Installation
Remote Probe |
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White/Yellow |
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Circuit Common |
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White/Violet |
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Remote Probe Installation
Remote Probe |
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White/Yellow | Normally |
Circuit Common | Closed |
Condensate | |
White/Violet | Switch |
FAN OPERATION
Your thermostat can be configured for up to two fan speeds. Fan staging follows the Heat and Cool Staging Separation. Heat and Cool staging can be user selected to different values.
The FAN button is used to select FAN AUTO or ON. In the Auto position the fan cycles on with demand for heating or cooling. If ON is selected the fan will run continuously.
FAN AUTO:
Fan cycles on with demand
FAN ON: |
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Fan runs continuously |
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| FAN 1 ON |
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| IF | 2F | 3F | 4F | ||||||||
SETPOINT | Temperature Demand |
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CONTROLLED OFF
FACTORY CONFIGURATION
A factory configuration may be provided to ensure minimum heat and cool requirements. With this configuration the heat and cool outputs are automatically cycled on at the heat and cool setback limits. Your thermo- stat may not have this feature.
© COPYRIGHT 2008 PECO, INC. ALL RIGHTS RESERVED. | P/N 69289 |
