Advertisement
Figure 6. Typical wiring for single transformer, single stage heat pump system
This thermostat is easy to operate. Fig. 8
shows how the heating/cooling system
and fan operate when the switches are in
various positions. Use the system switch
to select either heating or cooling, or to
turn the heating/cooling system off. Use
the fan switch to control fan operation.
When the fan switch is in the AUTO
position, the fan will cycle with the heat-
ing or cooling system (the fan will not run
if the system switch is in the OFF position
and the fan switch is in the AUTO posi-
tion). When the fan switch is in the ON
position, the fan will run continuously,
regardless of system switch position (even
if the system switch is set to OFF, the fan
will run if the fan switch is in the ON
position).
KEEP THIS
AREA CLEAR
OF WIRES!
Factory-installed
red jumper wire
O
Factory-installed
yellow jumper wire
Factory-Installed Jumper
RC
G
RH
TRANSFORMER
Fan
Hot
Relay
24 VAC
120 VAC
Neutral
Terminal energized
*
in cooling
6 0
7 0
5 0
8 0
9 0
9 0
8 0
7 0
6 0
5 0
Cover
Figure 7. Attach thermostat to subbase
Shows switch position
FAN
AUTO ON
Figure 8. Subbase switching and thermostat/system operation
G RC
B
THERMOSTAT
W
Field-installed
RH
A
jumper wire
Y
Field-Installed Jumper
O
W
Y
B
Compressor
*
* *
Relay
Terminal energized
* *
in heating
F A
A U
N
T O
O N
S Y
C O
S T
O L
O F
Thermostat
SYSTEM
COOL OFF HEAT
No heating; no cooling; no fan
No heating; no cooling; fan runs continuously
Cooling system cycles from thermostat; fan runs
continuously
Cooling system and fan cycle from thermostat
Heating system cycles from thermostat; fan cycles
from fan control on furnace
Heating system cycles from thermostat; fan runs
continuously
5
WIRING
A
SYSTEM
E M
F
H E
A T
Subbase
OPERATION &
MAINTENANCE
OPERATION
Advertisement
