32
Install the room thermostat in accordance with the instruction sheet packed in the box with
the thermostat. Run the thermostat lead wires through control entry opening (Figure 2 or
Figure 17) and connect to the low voltage thermostat connections (see wiring diagram).
Never install the thermostat on an outside wall or where it will be influenced by drafts, con-
cealed hot or cold water pipes or ducts, lighting fixtures, radiation from fireplace, sun rays,
lamps, televisions, radios or air streams from registers. Refer to instructions packed with
the thermostat for “heater” selection or adjustment.
The following is a list of recommended thermostats to be used with or without an econo-
mizer:
FIGURE 17
FIGURE 18
T
YPICAL THERMOSTAT WIRING
S
T-A1111-04
WIRE SIZE, AWG
14
1/2”
7/8”
12
1/2”
7/8”
10
1/2”
7/8”
8
3/4”
1-31/32”
6
1”
1-23/64”
4
1”
1-23/64”
3
1-1/4”
1-23/32”
2
1-1/4”
1-23/32”
1
1-1/2”
1-31/32”
0
1-1/2”
1-31/32”
00
2”
2-15/32”
000
2”
2-15/32”
CONDUIT SIZE
HOLE SIZE
NOTES: 1. DETERMINE REQUIRED WIRE SIZE FROM MINIMUM CIRCUIT AMPACITY SHOWN IN INSTALLATION & OPERATING INSTRUCTION.
2. BOTTOM POWER ENTRY WILL NOT ACCOMMODATE WIRE LARGER THAN #2 AWG (SHADED AREA).
WIRE FROM ZONE THERMOSTAT
TO BE ROUTED BEHIND SHIELD
AS SHOWN.
AND CONNECTED TO INTEGRAT-
ED FURNACE CONTROL LOW
VOLTAGE TERMINAL STRIP
POWER WIRES
FROM DISCONNECT
TO CONTACTOR
P
OWER WIRES
T
O DISCONNECT
W
IRE FROM
Z
ONE THERMOSTAT
T
O BE ROUTED BEHIND
S
HIELD AS SHOWN.
CUT HOLE
SIZED PER CHART
MIN. CIRCUIT AMPACITY
W
IRE SIZE FROM
M
IN. CIRCUIT AMPACITY
S
TRAIGHT CONDUIT
F
ITTING SIZED
P
ER CHART
CONDUIT FROM
POWER SUPPLY
SIZED PER CHART
CONDUIT FROM
ZONE THERMOSTAT
S
TRAIGHT
C
ONDUIT FITTING
WIRE FROM
ZONE THERMOSTAT
CONTROL VOLTAGE
KNOCK-OUT
C
ONDUIT
N
UT
BOTTOM
GAS ENTRY
E
XTERNAL
G
AS VALVE
MAIN
GAS VALVE
E
XTERNAL
P
IPING
S
UPPLIED
B
Y OTHERS
FIELD WIRE SIZE FOR 24 VOLT THERMOSTAT CIRCUITS
SOLID COPPER WIRE - AWG.
3.0 16 14 12 10 10 10
2.5 16 14 12 12 12 10
2.0 18 16 14 12 12 10
50 100 150 200 250 300
Length of Run – Feet (1)
Thermostat Load -
Amps
TABLE 6
(1) The total wire length is the distance from the furnace to the thermo-
stat and back to the furnace.
NOTE: DO NOT USE CONTROL WIRING SMALLER THAN NO. 18
AWG.
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