Install Instructions

© COPYRIGHT 2009 PECO, INC. ALL RIGHTS RESERVED. P/N 69387 3220-2124 REV 2 PAGE 4
FAN ON: Fan is on continuously and is not dependant on a heat or
cool demand.
FAN AUTO: Fan cycles on with a heat or cool temperature demand
and cycles off with the heat or cool output.
FAN SPEED: High, medium, or low is selected by the user.
Single setpoint represented in drawing. Programming mode includes
multiple setpoints.
Staged Fan Operation With Temperature Demand:
FAN ON: Fan stages from high to medium to low and stays continuously
on in the lowest available speed.
FAN AUTO: Fan stages from high to medium to low and cycles off at
set point.
FAN SPEED: is selected by the thermostat program.
Single setpoint represented in drawing. Programming mode includes
multiple setpoints.
Pipe Sensor Operation: A pipe sensor can be connected when the thermostat
is congured for either 2-pipe or 4-pipe fan coil operation (see JP4 jumper
conguration). The Pipe sensor is used to determine the water temperature
in the Main Coil. The Pipe Sensor should be mounted on the Main Coil supply
and wrapped with insulating material.
Pipe Sensor Input: 10K PECO Remote Probe or a standard On-Off Aqua-stat
can be used for summer/winter changeover. ON (closed) is winter heating
mode and OFF (open) is summer cooling mode.
Purge Cycle Operation: With a pipe sensor connected, this thermostat will
initiate a purge cycle if the sensed water temperature is ambiguous (not
adequately hot or cold). The purge cycle algorithm can be either temperature
or time based, depending on the conguration of Service Menu 16.
Temperature-Based Purge:
When an Ambiguous mode is detected and a demand exists, a 3
minute purge timer begins and the Main Output is opened.
After the 3 minute purge cycle, the thermostat checks again to see if
the water temperature is more than 15°F from set point, or above 80°F
or below 60°F.
If Winter or Summer mode is determined, normal HVAC operation
occurs. If still ambiguous, the thermostat checks to see if the COIL
temperature is below 60°F or above 80°.
Coil < 60°F = Summer Mode.
Coil > 80°F = Winter mode.
Purge Cycle is repeated until a non-ambiguous condition is sensed.
NOTE: If at any time the demand goes away, the thermostat will abort the
purge cycle.
Time-Based Purge: (Default)
The time-based purge cycle will start a 3-min purge cycle and enable
the Main Output if any of the following conditions occur: transition
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from OFF to AUTO mode, Reset event, power cycle, and/or 1-hour
timer expires.
After the 3 min purge cycle, a pipe sensor reading says:
Pipe is 15°F+ below the zone temp = Summer mode
Pipe is 15°F+ above the zone temp = Winter mode
Pipe is within 15°F of zone temp = still Ambiguous
If a Winter or Summer mode is determined, the appropriate heating/
cooling occurs. The thermostat will purge and check pipe temperatures
again after 1-hour.
If step 2 is still ambiguous, all thermostat outputs are disabled for 1
hour.
After 1 hour, the purge cycle resumes at step 1.
HVAC Setback Systems
Setback Operation - Remove JP3
This is a low level input that is normally open. When switch is closed, the T180
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 unless
control is turned to OFF.
Intelligent Occupancy Sensors like the SD200-001 and SD200-002 can be
used with this input to set the HVAC system to control at setback limits.
Occupancy Operation – Install JP3
The T180 can be used with PECO S200 series occupancy detection
equipment. The occupancy and switch inputs are designed to connect to the
SB200 slave sensor and SE200 door switch.
The Occupancy Sensor is a low-level switch that is open when there is
occupancy and closed when unoccupied.
The Door Switch is a low-level switch that is open when the door is
open and closed when the door is closed. This system requires both
an Occupancy Sensor and a Door Switch.
Operation From an Occupied Mode:
The T180 operates normally and looks for a door close. A door close
signal initiates an occupancy status detection.
If occupancy is detected, the T180 will maintain normal HVAC control.
It then waits for a door open signal before determining occupancy
again.
If no occupancy signal is detected within 2 minutes, the T180 changes
to unoccupied mode and controls at setback temperature values.
Operation From an Unoccupied Mode:
In an Unoccupied State, the T180 sets heating and cooling set points
to setback values, as determined in the service menu. In this mode,
the fan is automatically set to cycle with demand.
The T180 will continually monitor the room for occupancy.
Any occupancy detection, including door open, will set the operation
to occupied mode.
In either mode, if the door is left open for more than 2 minutes the T180 will
disable the HVAC system. A one-time ten minute override can be initiated by
pressing any thermostat key pad.
Door Switch Only Operation - Install JP3. A stand alone door or window
switch can be connected to the T180 to disable the HVAC system (outputs) if
a door or window is left open for more than 2 minutes. A one-time ten minute
override can be initiated by pressing any thermostat key pad.
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