IM 812 / Page 17 of 28
Remote
Thermostat
Temperature
Fall
System
Switch
Heat
Off
Cool
On
Auto
Fan
Switch
Common
Slave Unit
RD YE
GN WH
BK
W1
Y1
G1
R1
W
Y
G
R
BL
BR
Plug and Wire Assembly
7 Pin Receptacle on Cord Going to
Main PC Board
High FAN
2nd Stage
Heat
Installing Remote Mounted Thermostat
Units that use remote mounted 24V thermostats should be
field wired as shown in Figure 16. The Remote Wall Thermo-
stat internal wiring shown is typical for manual changeover.
Other thermostats will have different internal wiring. Master
transformer size (15VA) allows only one slave (2 units per wall
stat). Other considerations for this arrangement are as follows.
1. When wiring the low voltage plug and wire assembly, pro-
vide enough wire to move harness out of the way for
chassis removal. Also see pages 5 and 8.
2. If a subbase is used under the unit wall sleeve, a small
hole may be drilled and grommeted in the subbase front to
allow passage of the low voltage wires.
3. When using a programmable or electronic wall thermostat
that requires 24V power, include the BK (common) wire to
the thermostat. Wall stats with 2 stage heat or multiple fan
speed controls, may require that all 7 low voltage wires be
connected. Two stage thermostats must be programmed
to power both WH and BR wires simultaneously to bring
on 2nd stage heat (electric) and turn off reverse cycle
heating.
Figure 16. Typical Remote Thermostat Wiring
Hazardous Voltage!
Disconnect all electric power including remote
disconnects before servicing. Failure to discon-
nect power before servicing can cause severe
personal injury or death.
Use copper conductors only. Unit terminals are not
designed to accept other types of conductors.
Failure to do so may cause damage to the
equipment.
WARNING
!
CAUTION
!
