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INTEGRATED
FURNACE CONTROLS
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
50V51-843 TYPICAL SYSTEM WIRING DIAGRAM
HOT
(LINE)
HUMIDIFIER
(OPTIONAL)
ELECTRONIC
AIR CLEANER
(OPTIONAL)
THERMOSTAT
CONDENSING
UNITS
FLAME
SENSOR
PROBE
120 VAC
24 VAC CLASS II
TRANSFORMER
TH
24 VAC
TR
50V51-843
LINE
XFMR
EAC
HUM
IGN
IND HI
INDUCER
IND LO
IND N
IGN N
CIRC N
HUM N
LINE N
XFMR N
EAC N
R
R
G
G
W2
W2
W1
W1
Y
Y2
Y
YLO
DEHUM
B/C
O
E2
HIGH LIMIT
(N. C.)
HLO
HLI
FP
PS1
MVL
MVH
GND
GND
PS2
MV COM
TR
TH
2ND STAGE PRESSURE
www.white-rodgers.com
21V51U-843 WIRING
AND CONFIGURATION
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.
CIRC.
INTER-
CIRCULATOR
FACE
IGNITOR
1ST STAGE PRESSURE
ROLLOUT
SWITCH (N. O.)
SWITCH (N. C.)
AUX. HIGH
LIMIT (N. C.)
GAS
VALVE
SWITCH (N. O.)
NEUTRAL
(LINE)
LEGEND
Low Voltage (24 VAC)
Line Voltage (120 VAC)
N.C. = Normally closed switch
N.O. = Normally closed switch
183
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Summary of Contents for White Rogers 21V51U-843
- Page 1 INTEGRATED 21V51U-843 WIRING FURNACE CONTROLS AND CONFIGURATION The 50V51-843 has only one serviceable part –an automotive cause of the control’s problem, replace the entire 50V51-843 control. There are no other user serviceable parts. type fuse, which protects the low voltage transformer from dam- age if the output is short-circuited.
- Page 2 21V51U-843 WIRING INTEGRATED AND CONFIGURATION FURNACE CONTROLS 50V51-843 TYPICAL SYSTEM WIRING TABLE 50V51-843 TERMINAL SYSTEM COMPONENT TERMINAL TYPE CONNECTION two-stage thermostat W1 terminal (or equivalent) two-stage thermostat W2 terminal (or equivalent) two-stage thermostat G terminal (or equivalent) 9-screw two-stage thermostat R terminal (or equivalent)
- Page 3 INTEGRATED 21V51U-843 FURNACE CONTROLS OPERATION OPTIONS SWITCHES Heat Fan Off Delay Timing DIP switches S7-3 and S7-4 (see table above) configure Option switches are used to determine the length of the delay periods. The following tables show the time periods that will the number of seconds the blower will run after the call result from the various switch settings.
- Page 4 21V51U-843 INTEGRATED OPERATION FURNACE CONTROLS OPTION SWITCH SETTING - NORMAL OPERATION – HEAT ON When the thermostat calls for heat the module verifies the MOTOR OPTIMIZATION pressure switches are open and energizes the inducer Amana/Goodman/Trane/Lennox/Thermo Pride – The motor (high speed) and optional humidifier contacts. When the low configuration DIP switches S3 and S4 must be set to match pressure switch contacts close a 15 second pre-purge begins.
- Page 5 INTEGRATED 21V51U-843 FURNACE CONTROLS OPERATION To reset the control after system lockout, do one of the MOUNTING AND WIRING following: All wiring should be installed according to local and national electrical codes and ordinances. System Reset The control must be secured to an area that will experience a...
- Page 6 21V51U-843 INTEGRATED OPERATION FURNACE CONTROLS TRI-COLOR (DSI LED) DIAGNOSTIC TABLE Green Amber Red LED Error/Condition Comments/Troubleshooting Flash Flash Flash Flame sensed when no flame should be Verify the gas valve is operating and shutting down properly. Flame in burner assemble should extinguish promptly at the end of the cycle. Check orifices present and gas pressure.
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