White Rodgers 1F85-0477 Installation And Operating Instructions Manual page 4

WIRING DIAGRAMS
Figure 5 – Single Stage or Multi-Stage System (No Heat Pump) with Two Transformers
System
Single
Stage 1
(SS1)
Fault
Indicator
(NOT
USED)
Multi-
Stage 2
(MS2)
NEUTRAL
120VAC
24VAC
HOT
HEATING
CLASS II
TRANSFORMER
6
System
Single Stage
Closes
3-wire
Valve
Zone Valve
(6)
application
4
L Y
O/B
O
Energized Constantly
in Cool Mode
Cool Mode
B
1st Stage
Energized Constantly
in Heat, Off,
Emergency
Mode
Figure 6 – 3-Wire (SPDT) Heat Only Zone Valve Wiring
W
G
Y
Opens
Blower/Circulator
Valve
Fan Energized
(4)
G
Y2 W2
W/E
Blower/
No
Circulator
No Output
Output
Fan Energized
Heat on Call for
Mode
Cool (and
1st Stage
Heat if
Cool
Heat Mode configured
Mode
2nd Stage for Electric
2nd
Heat)
Stage
Jumper
RH C
RC
24 Volt Constant
24 Volt
(Hot) 24 Volt
(Hot)
Heat (Com-
Cool
mon)
(5)
Remove Jumper Wire
Jumper
between RH & RC
RH RC
C
Optional
24 Volt 24 Volt
24 Volt
(Hot) (Hot)
(Com-
Heat Cool
mon)
NEUTRAL
24VAC
HOT
CLASS II
TRANSFORMER
NEUTRAL
24VAC
HOT
CLASS II
TRANSFORMER
120VAC
COOLING
120VAC