White Rodgers 1F90W-51 - Manual (Page 4)

4
All wiring diagrams are for typical systems only. Refer to
equipment manufacturers' instructions for specific sys-
tem wiring information. To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box or circuit breaker until installation is
complete.
NOTE CAUTION !
RC Y
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 6. Typical Wiring Diagram for Cool Only, 3-Wire, Single Transformer Systems
Fan
Relay
Cooling
System
RH
TRANSFORMER
G
RC
Y
W
RH
Thermostat Terminal Connections
G
From 24vAC
transformer
From fan relay
From cooling system
RC
Y
RH Y
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 5. Typical Wiring Diagram for Heat Only, 3-Wire, Single Transformer Systems
TRANSFORMER
RC
Fan
Relay
Heating
System
JUMPER
WIRE
G
RC
Y
W
RH
W
RH
Thermostat Terminal Connections
G
From heating system
From 24vAC
transformer
From fan relay
CONNECT red jumper
wire (provided)
NOTE
RED jumper wire (pro-
vided with thermostat)
must be connected be-
tween thermostat's RH
and RC terminals for pro-
per thermostat operation
with this system.
RH Y
24vAC 120vAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 4. Typical Wiring Diagram for Heating Only, 2-Wire, Single Transformer Systems
TRANSFORMER
Heating
System
RC
G
RC
Y
W
RH
W
RH
Thermostat Terminal Connections
From heating system
From 24vAC transformer