Wiring - White Rodgers 21V51U-843 Installation Instructions Manual

WIRING

The 50V51-843 has only one serviceable part –an automotive
type fuse, which protects the low voltage transformer from dam-
age if the output is short-circuited. If the fuse has opened up,
remove whatever caused the short circuit and replace the fuse
with only a 3 amp automotive type fuse. If the fuse is not the
HOT
(LINE)
HUMIDIFIER
(OPTIONAL)
ELECTRONIC
AIR CLEANER
(OPTIONAL)
THERMOSTAT
CONDENSING
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N.C. = Normally closed switch
N.O. = Normally closed switch
6
50V51-843 TYPICAL SYSTEM WIRING DIAGRAM
120 VAC
TH 24 VAC
50V51-843
INDUCER
IND LO
[5-Pin Connector]
CIRC N
HUM N
LINE N
XFMR N
EAC N
R R
G G
W2 W2
W1 W1
Y2 Y
Y YLO
DEHUM
UNITS
B/C
O
HUMIDISTAT
(OPTIONAL)
FLAME
SENSOR
PROBE
MV COM
[12-Pin Connector]
LEGEND
cause of the control's problem, replace the entire 50V51-843
control. There are no other user serviceable parts.
Following installation or replacement, follow appliance manu-
facturer's recommended installation or service instructions to
insure proper operation.
24 VAC CLASS II
TRANSFORMER
TR
CIRC
LINE
CIRCULATOR
XFMR
EAC
HUM
IGN
IND HI
IGNITOR
IND N
IGN N
E2
HIGH LIMIT ROLLOUT
(N. C.) SWITCH (N. C.)
HLO
HLI
AUX. HIGH
FP
LIMIT (N. C.)
PS1
MVL
MVH
GND
GND
PS2
TR
TH
2ND STAGE PRESSURE
SWITCH (N. O.)
IND IND IND IGN
IGN
HI LO N N
5-Pin Connector
NEUTRAL
(LINE)
CIRC.
INTER-
FACE
1ST STAGE PRESSURE
SWITCH (N. O.)
GAS
VALVE
MVH GND MVL GND
MV
PS2 TH HLO
COM
FP HLI TR PS1
12-Pin Connector