3. Disconnect wires from existing thermostat, 1 at a time. Be
careful not to allow wires to fall back into wall.
4. As each wire is disconnected, record wire color and
terminal marking.
5. Discard or recycle old thermostat.
NOTE:
Mercury is a hazardous waste and MUST be disposed of
properly.
6. If existing thermostat cable is acceptable for application
(See Table 5), proceed to Mount Wall Thermostat and
Connect Thermostat Wires section.
If installing new thermostat cable, route as follows:
1. Drill hole for cable at location selected for thermostat.
2. Remove front panel of unit.
3. Route thermostat cable from unit’s compartment and pull
approximately 6-12 in. of cable through hole drilled in wall
for connection to thermostat terminals.
4. Strip outer casing off area of cable pulled through wall for
greater flexibility.
TABLE 5—REQUIRED THERMOSTAT CABLE TYPE
APPLICATION
THERMOSTAT
NO. OF
CONDUCTORS
REQUIRED
18 GAGE
REQUIRED
CONNECTIONS
WIRING
DIAGRAM
Air Conditioner
Robertshaw (TX400-42K)
4
G, R, Y, W
Fig. 18
TSTATPPNAC01-A
5
R, C, W/W1, Y/Y2, G
Fig. 19
TSTATPPPAC01-A
5
R, C, W/W1, Y/Y2, G
Fig. 20
Heat Pump
Honeywell (T841A1548)
6
G, R, Y, B, W2, E
Fig. 21
TSTATPPNHP01-A
8
R, C, W/W1, Y/Y2, G, B, S1, S2
Fig. 25
TSTATPPPHP01-A
8
R, G, W/W1, Y/Y2, C, B, S1, S2
Fig. 26
Fig. 17—Typical Wiring Installation
NOTE:
This diagram shows a typical wiring installation for an 036 unit with 15-kw heat. It may not reflect the wiring in unit. The actual wiring
installation to use depends on unit and electric heat requirements. (See Tables 3 and 4.) The installer must follow NEC, state, and local codes.
A95353
ON
OFF
60 AMP
ON
OFF
30 AMP
ON
OFF
40 AMP
SERVICE GROUND LUG
FOR NO. 10 AWG
AND NO. 8 AWG
NO. 6 AWG AUXILIARY
10KW HEATER NO. 2
LOAD LEADS
10KW
5KW
AUXILIARY
10KW HEATER NO. 2
LOAD LEADS
AUXILIARY
5KW HEATER NO. 1
LOAD LEADS
NO. 10 AWG AUXILIARY
5KW HEATER NO. 1
LOAD LEADS
NO. 8 AWG
COMPRESSOR LEADS
NO. 8 AWG
COMPRESSOR LEADS
COMPRESSOR
—8—
