N O T E
If you are mounting the base to a soft material like plasterboard or if you
are using the old mounting holes, the screws may not hold. Drill a 3/16-
in. (4.8mm) hole at each screw location, and insert the plastic anchors
provided. Then mount the base as described below.
WIRING DIAGRAMS
These diagrams are provided for new installations or un-referenced
wires.
G
C
Y
RC
O
B
RH
W
TERMINALS
BASE
TAB
5. Route the wires through the large hole in the base
plate by the terminal block. Hold the base against the
wall, with the wires coming through. Position the base
for best appearance (to hide any marks from an old
thermostat). The terminal block should be either to the
right of or below the routing hole. Attach the base to the
wall with the two screws provided.
C A U T I O N
Read instructions carefully before removing any wiring from existing
thermostat. Wires must be labeled before they are removed. When removing
wires from their terminals, ignore the color of the wires since they may not
comply with any standard.
REMOVING THE OLD THERMOSTAT
1. Switch electricity to the furnace and air conditioner
OFF; then proceed with the following steps.
2. Remove cover from old thermostat. Most are snap-on
types and simply pull off. Some have locking screws on
the side. These must be loosened.
3. Note the letters printed near the terminals. Attach labels (enclosed) to
each wire for identification. Label and remove wires one at a time. Make
sure the wires do not fall back inside the wall.
4. Loosen all screws on the old thermostat and remove it from the wall.
MOUNTING THE PSD111 ON THE WALL
1. Decide whether the thermostat will be mounted vertically or horizontally.
Y
W
C A U T I O N
Be careful not to drop the unit or disturb any electronic parts.
2. Strip insulation 3/8 in. (9.5mm) from
wire ends and clean off any corrosion.
3. Fill wall opening with non-combustible
insulation to prevent drafts from affecting
the thermostat.
4. Cup the thermostat with one hand behind the thermostats display.
Separate the unit from it’s base
plate using the tabs protruding
from it’s body with the other hand.
Y
W
Y
W
R
ATTACHING WIRES
W
RH
B
O
RC
Y
G
C
J
U
M
P
E
R
P
R
O
V
I
D
E
D
W
RH
B
O
RC
Y
G
C
J
U
M
P
E
R
P
R
O
V
I
D
E
D
W
RH
B
O
RC
Y
G
C
J
U
M
P
E
R
P
R
O
V
I
D
E
D
W
RH
B
O
RC
Y
G
C
J
U
M
P
E
R
R
E
M
O
V
E
D
W
RH
B
O
RC
Y
G
C
J
U
M
P
E
R
P
R
O
V
I
D
E
D
GAS
VALVE
TYPICAL 2 WIRE HEAT HOOKUP
24 VAC AND MILLIVOLT SYSTEMS
AC
LINE
24
VAC
XFMR
OPTIONAL
COMMON
GAS
VALVE
TYPICAL 3 WIRE HEAT HOOKUP
WHERE THIRD WIRE IS FAN WIRE
AC
LINE
24
VAC
XFMR
FAN
OPTIONAL
COMMON
GAS
VALVE
TYPICAL 4 WIRE HOOKUP
HEATING AND COOLING
AC
LINE
24
VAC
XFMR
FAN
COOL
COMPRESSOR
OPTIONAL
COMMON
GAS
VALVE
TYPICAL 5 WIRE HOOKUP
HEATING AND COOLING
AC
LINE
24
VAC
24
VAC
XFMR
AC
LINE
XFMR
FAN
COOL
COMPRESSOR
OPTIONAL
COMMON
TYPICAL SINGLE STAGE HEAT PUMP
HEATING AND COOLING
24
VAC
AC
LINE
XFMR
CHANGEOVER
VALVE
FAN
HEAT
COMPRESSOR
OPTIONAL
COMMON
NOTE: ADD JUMPER BETWEEN "W" AND "Y"
B
B
O
O
B
O
OR
USE "B" OR "O"
BUT NOT BOTH
ALL COMMON WIRES ARE OPTIONAL
AND MAY BE TAPED OFF
W
RH
B
O
RC
Y
G
C
OPTIONAL
OPTIONAL
OPTIONAL
OPTIONAL
OPTIONAL
OPTIONAL
TC B
C
F
G
RC
RH
V 5
R
H
W
4
J
U
M
P
E
R
P
R
O
V
I
D
E
D
ALL COMMON WIRES ARE OPTIONAL
AND MAY BE TAPED OFF
** IF A "B" WIRE IN YOUR SYSTEM IS A
SYSTEM COMMON, THEN CONNECTING IT
AT THE "B" TERMINAL MAY CAUSE
DAMAGE TO YOUR SYSTEM
* IF Y AND "C" ARE BOTH PRESENT,
"C" IS THE COMMON WIRE
W
RH
B
O
RC
Y
G
C
DO NOT CONNECT
A "B" WIRE HERE
UNLESS YOU ARE SURE
THAT IT IS CORRECT
B
TC
C
F
G
C*
6
Y
RC
RH
V 5
R
B**
H
W
4
O
J
U
M
P
E
R
P
R
O
V
I
D
E
D
J
U
M
P
E
R
R
E
M
O
V
E
D
ALL COMMON WIRES ARE OPTIONAL
AND MAY BE TAPED OFF
** IF A "B" WIRE IN YOUR SYSTEM IS A
SYSTEM COMMON, THEN CONNECTING IT
AT THE "B" TERMINAL MAY CAUSE
DAMAGE TO YOUR SYSTEM
* IF Y AND "C" ARE BOTH PRESENT,
"C" IS THE COMMON WIRE
* IF Y AND "C" ARE BOTH PRESENT,
"C" IS THE COMMON WIRE
B**
W
RH
B
O
RC
Y
G
C
B
TC
C
F
G
R
RC
C*
6
Y
RH
V 5
H
W
4
O
ALL COMMON WIRES ARE OPTIONAL
AND MAY BE TAPED OFF
W
RH
B
O
RC
Y
G
C
B TC
C
F
G
C*
Y
6
RC
R
V
J
U
M
P
E
R
P
R
O
V
I
D
E
D
HEATING SYSTEMS
COOLING SYSTEMS
4- or 5-WIRE WITH ONE TRANSFORMER
5- or 6-WIRE WITH TWO TRANSFORMERS
HEATING / COOLING SYSTEMS
HEATING / COOLING SYSTEMS
DO NOT CONNECT
A "B" WIRE HERE
UNLESS YOU ARE SURE
THAT IT IS CORRECT
