Install Instructions

© Copyright 2005 PECO, Inc. All Rights Reserved P/N 68841 3220-1479 Rev 0 Page 2
THERMOSTAT OPERATION
APPLICATION NOTES
1. When no changeover pipe sensor is used, the main output
controls cooling and the secondary output controls heating.
2. The fan output, terminal 12, is energized whenever there is
a demand for heating or cooling. This output can be
connected to a relay that can be used to provide fan cycling
to terminal 1.
3. The changeover pipe sensor should be mounted on the
main coil input for water system operation and in the main
duct system for forced air operation.
4. The set point and operating mode will be retained on a loss
of power.
5. When using either a remote probe or pipe sensor, run wiring
away from any electrical motors or power wiring.
6. The auxiliary heat output supplies a 24 VAC signal with call
for heat. This output is shipped configured for staged heat.
7. The thermostat is shipped with all dip switches in the “ON”
(closed) position.
8. The damper output is ON when mode is AUTO, HEAT or
COOL, damper is OFF in set back.
CONFIGURATION
CIRCUIT BOARD JUMPER CONFIGURATION
Jumper
Designation
Closed
ON*
Open
OFF
JP1
JP2
JP3
JP4
JP5
Local Sensing
2 Pipe System
Factory Use Only
0-10 VOC
Main Output
0-10 VOC
Secondary Output
Remote Sensing
4 Pipe System
4-20 mA
Main Output
4-20 mA
Secondary Output
* On is with the dip switch handle to the right-see diagram below
DIP SWITCH CONFIGURATION
Switch
Designation
Closed
On*
Open
Off
1
2
3
4
5
6
Not Used
Not Used
Not Used
Staged Heat
3°F Diff. (Term. 13)
Aux. Heat No
Diff. (Term. 13)
F Display
C Display
Main & Sec. Outputs
0-10 VOC (Term. 10 & 11)
requires JP4 & JP5
Main & Sec. Outputs
4-20 mA (Term. 10 & 11)
Remove JP4 & JP5
Operating Position
Setback= 90°F & 50°F
Setback = 85°F & 60°F
These thermostats are designed to control 0-10 VDC/4-0 mA
valves. These units may include a fan switch with one or
more fan speed selections.
MODE BUTTON OPERATION
OFF All thermostat outputs are off, fan is still operational if
connected to a manual fan switch.
AUTO The thermostat automatically selects heating or
cooling mode depending upon the relationship of the
setpoint and the room temperature. The appropriate
HEAT or COOL indicator is enabled in addition to
AUTO. A 3°F dead band is provided to prevent
short cycling between heating and cooling modes.
After changeover, the control points automatically
shift so that the heating off point equals the set
point temperature or the cooling off point equals the
set point temperature.
COOL The thermostat operates as a cooling only
thermostat. The heating outputs are disabled.
HEAT The thermostat operates as a heating only
thermostat. The cooling outputs are disabled.
FAN SPEED SWITCH OPERATION
Fan speed is determined by manual selection from
fan switch OFF to HIGH, MEDIUM and/or LOW. In
the OFF position all outputs are off and the display is
blank.
UP/DOWN ARROW OPERATION
A first touch of either arrow will display the setpoint
(a single set point is employed for both heating and
cooling). Continued pressure on either arrow will
scroll the setpoint to new values. After three
consecutive seconds on either arrow, the selected
setpoint becomes effective and the display of the
room temperate resumes.
Item # Function Range Default
1 Zone Temp Offset -5.1F to 5.1F 0F
2 Valve Stroke Time 30 sec. To 5 min. 120 sec.
3 Fan Delay to OFF 2 to 10 Minutes 120 Sec.
4 Compressor Minimum
Off Time
30 Sec. To 10 min. 120 Sec.
5 Purge Cycle 0 = Time Based
1 = Temperature Based
1
Service Menu:
Access: Press UP and DOWN arrows for 5 seconds.
Menu Selection: Select 1 to 5 by pressing the mode button
or by pressing the UP and DOWN arrows simultaneously.
Adjust Value: Use UP or DOWN arrow.