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Part I: Install the wallPlate
1. Position the wallplate on the wall with the directional arrow pointing up (see Fig. 3) and
terminal blocks facing outward.
Figure 3.
Position
the wallplate
on the wall.
Pull wires
through
wiring passage.
terminal blocks enlarged
2. Pull equipment wires through the wallplate wiring passage (see Fig. 3).
3. Use a level to determine the best horizontal wallplate mounting position.
4. Mark positions of the screw holes (two at minimum) with a pencil and remove wallplate.
5. Drill holes at pencil-marked locations (3/16" for drywall, 7/32" for plaster).
6. Insert the wall anchors in the holes, tapping them into place.
7. Mount the wallplate onto the wall and insert screws through mounting holes. Assure
that all loose wires come through the center opening of the backplate (see Fig. 3).
8. Cap off any unused wires and terminate properly according to local building codes.
Part II: attach wIres to thermostat wallPlate
1. Select the terminal designations that correspond to the system type (see Table 1).
▲
• warnInG: Disconnect power before beginning installation.
!
• caUtIon: Use copper wire only. Insulate or wire-nut all unused leads.
• Use care to avoid electrostatic discharge to thermostat
taBle 1. termInal DesIGnatIons anD sYstem tYPes
Conventional Terminal Letters
Unswitched side, 24 VAC
c
Stage 1 Heat
w1
Stage 2 Heat
w2
Fan
G
a
e
Stage 1 Cool
Y1
Stage 2 Cool (or
Y2
Dehumidify)
Power for heating,
rh
switched side, 24 VAC
Power for cooling,
rc
switched side, 24 VAC
Sensor Common
sc
Indoor Remote Sensor
s1
Occupancy Setback Input s2
s2
i
all electrIcal loaDs
mUst Be connecteD to
termInal c (24 vac).
© COPYRIGHT 2010 PECO, INC. ALL RIGHTS RESERVED.
wiring passage
Heat Pump Terminal Letters
Unswitched side, 24 VAC
c
Reversing Valve
B/o
Auxiliary (Stage 3 Heat)
aUX
Fan
G
a
e
Compressor Stage 1, Heat /Cool 1
Y1
Compressor Stage 2, Heat /Cool 2
Y2
(or Dehumidify)
Power for heating,
rh
switched side, 24 VAC
Power for cooling,
rc
switched side, 24 VAC
Sensor Common
sc
Indoor Remote Sensor
s1
Occupancy Setback Input
*note: See "PECO Compatible Accessories"
in Operating Manual to learn about additional
sensor applications.
System Type 1: 1H/1C Conventional
TERM
Function
C
Common
W1
Heat
W2
G
Fan
A
E
Y1
Cool
Y2
RH
Power for Heating
RC
Power for Cooling
System Type 3: Heat only (without fan)
TERM
Function
C
Common
W1
Heat
W2
G
A
E
Y1
Y2
RH
Power for Heating
RC
System Type 5: Cool only
TERM
Function
C
Common
W1
W2
G
Fan
A
E
Y1
Cool
Y2
RH
Power for Heating
RC
Power for Cooling
System Type 7: 2H/2C Conventional
TERM
Function
C
Common
W1
Heat 1
W2
Heat 2
G
Fan
A
E
Y1
Cool 1
Y2
Cool 2
RH
Power for Heating
RC
Power for Cooling
2
System Type 2: 1H/1C Heat Pump
TERM
Function
C
Common
B/O
Reversing Valve
AUX
G
Fan
A
E
Y1
Compressor
Y2
RH
Power for Heating
RC
Power for Cooling
System Type 4: Heat only with fan
TERM
Function
C
Common
W1
Heat
W2
G
Fan
A
E
Y1
Y2
RH
Power for Heating
RC
System Type 6: 2H/1C Heat Pump (Aux.)
TERM
Function
C
Common
B/O
Reversing Valve
AUX
Auxiliary Heat
G
Fan
A
E
Y1
Compressor
Y2
RH
Power for Heating
RC
Power for Cooling
System Type 8: 2H/1C Conventional
TERM
Function
C
Common
W1
Heat 1
W2
Heat 2
G
Fan
A
E
Y1
Cool
Y2
RH
Power for Heating
RC
Power for Cooling
P/N 70476 3220-2265 REV 01
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