White Rodgers 50A55-843 User Manual

2

°

°

Input Voltage: 25 VAC 50/60 Hz
Max. Input Current @ 25 VAC: 0.45 amp

Relay Load Ratings:

Valve Relay:

1.5 amp @ 25 VAC 50/60 Hz 0.6 pf

Ignitor Relay:

6.0 amp @ 120 VAC 50/60 Hz
(resistive)

Inducer Relay:

2.2 FLA–3.5 LRA @ 120 VAC

Circulator Relay:

14.5 FLA–25.0 LRA @ 120 VAC

Minimum current to insure flame detection: 1 

µ

a DC*

Maximum current for non-detection: 0.1 

µ

a DC*

Maximum allowable leakage resistance: 100 M ohms

*Measured with a DC microammeter in the flame probe lead

-40

°

 to 175

°

F (-40

°

 to 80

°

C)

5% to 93% relative humidity (non-condensing)

Surface mount multipoise

Timing Specs: (@ 60 Hz**)

Flame Establishing Time:

0.8 sec

Flame Failure Response Time:

2.0 sec

** At 50 Hz, all timing specifications should be increased by

20%

Gases Approved: Natural, Manufactured, Mixed, Liquified
Petroleum, and LP Gas Air Mixtures are all approved for use.

(All times are in seconds, unless noted otherwise)

PRE-PURGE

INITIAL IGNITOR WARM-UP 
(1st 64 attempts)

MINIMUM IGNITOR WARM-
UP

MAXIMUM IGNITOR WARM-
UP

IGNITION ACTIVATION 
PERIOD

TRIAL FOR IGNITION 
PERIOD

RETRIES

VALVE SEQUENCE PERIOD

INTERPURGE

POST-PURGE

LOCKOUT TIME

HEAT DELAY-TO-FAN-ON*

HEAT DELAY-TO-FAN-OFF*

COOL DELAY-TO-FAN-ON

COOL DELAY-TO-FAN-OFF*

AUTO RESET

HUMIDIFIER

ELECTRONIC AIR CLEANER

30

17

5

21

1

4

2 times

12

60

15

300

30, 45

60/90/ 

120/180

5

45, 90

60 minutes

YES

YES

50A55-843

* These times will vary depending on 

option switch position. The control is 
factory-set at 30 seconds heat delay-
to-fan-on, 180 seconds heat delay-to-
fan-off and 45 seconds cool delay-to-
fan-off. See OPERATION section for 
further information.