White Rodgers 50A55-843 Reference Guide
50A55-843 Universal Cross Reference Chart
30
4
Ignition Activation
2 times
Valve Sequence
60
15
300
60, 90,
60, 90,
60, 100,
60, 90,
120, 180
Cool
Cool
Air Cleaner
Humidifier
See other side for 50A50 replacement Cross Reference
50A55-474,
Type Number
50A55-120 50A55-143 50A55-285 50A55-286 50A55-288 50A55-438
Pre-Purge 15 30 0 0 0 0 0
Trial for Ignition 4 4 4 7 4 4 4
Period
1 4 4 4 1 3 1 1
Retries 4 times 4 times 2 times 2 times 2 times 2 times 2 times
Period
12 20 12 21 12 12 12 12
Interpurge 15 60 60 15 60 60 60
Post-Purge 5 5 15 15 15 5 5
Lockout Time 150 678 272 272 300 269 300
Heat
Delay-to-Fan-On
Heat
Delay-to-Fan-Off
Delay-to-Fan-On
Delay-to-Fan-Off
terminal
terminal
45
120, 180
0 0 0 0 5 2 2 5
0 45 45 45 45 0, 80 0,,80 45, 90
Yes Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes
15, 30,
45, 60
60, 90,
120, 180
30 30
60, 90,
120, 180
60, 90,
120, 180
30
120, 180
45
60, 90,
120, 180
140, 180
Replaces
-571
45
50A55-843
30, 45
*
All times are in seconds
*The Universal 50A55-843 control will replace all 50A50 and 50A55 models
Part No. 37-6376A
1
0204
50A55-843 Universal Cross Reference Chart
Ignition Activation
Valve Sequence
Cool
Cool
Air Cleaner
Humidifier
30
4
2 times
60
15
300
60, 90,
120, 180
See other side for 50A55 replacement Cross Reference
Type Number
Pre-Purge
Trial for Ignition
Period
Retries
Period
Interpurge
Post-Purge
Lockout Time
Heat
Delay-to-Fan-On
Heat
Delay-to-Fan-Off
Delay-to-Fan-On
Delay-to-Fan-Off
terminal
terminal
Replaces
50A50-143 50A50-285 50A50-286 50A50-438 50A55-843
30 0 0 0
7 7 7 6
4 4 4 3 1
6 times 2 times 2 times 2 times
49 21 21 18 12
60 60 60 60
0 15 15 5
678 272 272 269
15, 30, 45, 60 30 30 45
60, 90,
120, 180
90
60, 90,
120, 180
90, 120,
150, 210
30, 45
0 5 0 2 5
110 45 45 0, 80 45, 90
Yes Yes N/A Yes Yes
Yes Yes N/A Yes Yes
50A50-110,
-111, -112,
-113
50A50-205,
-206, -207,
-288, -295
50A50-209,
-296
50A50-405,
-406,-408,
-471, -472,
-473, -474
*
All times are in seconds
*The Universal 50A55-843 control will replace all 50A50 and 50A55 models
Part No. 37-6376A
2
0204
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