Heating Blower On And Off Delay; Dip-Switch Settings Or Jumper Wire - American Standard *UD Series Operation Manual

White-Rodgers Integrated Furnace Controls –

Heating Blower On and Off Delay

These controls provide a fixed 45 second indoor "blower
on" delay after the flame is sensed during heating
cycles. After this time delay, the indoor blower
motor will be energized to run on heating speed. The
Control also provides an indoor "blower off" delay.
The 50A50-571 I.F.C. delay to off is not adjustable,
all other 50A50 and 50A51 controls have field
adjustable delays to off. The off delay time is field
selectable by adjusting Dip-Switches 2 and 3 on
the Control.

Dip-Switch Settings or Jumper Wire

1 2 3
ON
OFF
Cooling Fan Off Delay (seconds)
Switch 1/Jumper ON = 0 (Factory Setting)
Switch 1 OFF/Jumper cut = 80
Heating Fan Off Delay (seconds)
Switch 2 Switch 3
ON OFF
OFF ON
ON ON
OFF OFF
1 I.F.C. Control 50A50-473-474 and 50A51-495/507 use these
harmonized delay times, 50A50-571 heating time delay is
100 seconds.
2 Factory setting.
Time Time1
90 60
120 140
1502 1002
210 180
WHITE–RODGERS
Model 50A50-571
FOR USE WITH ALL GASES
INPUT: 25VAC. 60HZ.
XFMR SEC. CURRENT: 350mA + MV
IGN. OUTPUT: 6.0A @ 120VAC; MV OUTPUT 1.5A @ 24VAC
IND. OUTPUT: 1.5 FLA, 3.0 LRA @ 120VAC
CIR. BLOWER OUTPUT: 14.5 FLA, 25.0 LRA @ 120VAC
TRIAL FOR IGNITION: 4 SEC.; PREPURGE: 0 SEC.
RETRIES: 2; ATTEMPTS: 3; POSTPURGE: 5 SEC.
CIR. BLOWER ON DELAY: HEAT 45 SECONDS.
DISCONNECT POWER
BEFORE SERVICING
-NOT FIELD REPAIRABLE-
REPLACE ONLY WITH
EXACT MODEL NUMBER.
EXPLOSION AND SERIOUS
INJURY COULD RESULT
HOT 120VAC
CIRCULATOR BLOWER
50A51-405 Control
RS
Emerson Electric Co.
D340021P01
REPLACE WITH
CNT1308
® ®
50A50-571 Control
Emerson Electric Co.
D330927P01
REPLACE WITH
CNT 2181
® ®
HEATING OFF DELAY (SEC.) CUT JUMPER FOR
80 SEC. COOL OFF
100 SEC.**
DELAY.
COOLING OFF DELAY (SEC.)
0 SEC.**
**FACTORY SETTING
DIAGNOSTIC INDICATOR
FLASHING SLOW NORMAL. NO CALL FOR HEAT
FLASHING FAST NORMAL. CALL FOR HEAT
CONTINUOUS ON INTERNAL CONTROL FAILURE (REPLACE)
CONTINUOUS OFF NO POWER OR CONTROL FAILURE
2 FLASHES SYSTEM LOCKOUT (NO FLAME) CHECK LINE POLARITY
3 FLASHES PRESSURE SWITCH PROBLEM
4 FLASHES THERMAL PROTECTION DEVICE OPEN
5 FLASHES FLAME SENSED WITH GAS VALVE OFF
REFER TO SERVICE INSTRUCTIONS FOR MORE INFORMATION
IND IGN
IND IGN
N N
8
50A50 & 50A51 Series
1 2 3
Clip
Wire
TH FP HLO
TR
MV GND HLI
MV PS
E
NEUTRAL 120VAC
ON
OFF