Identifying Radiant Sense Controls - American Standard *UD Series Operation Manual

Identifying Radiant Sense Controls

50A52-100 Version 1 (E90)
E90 – Cooling fan runs when limit opens
50A52-100 Version 4 (E93)
E93 – 2 try lock out control. Used in BAYLPKT212/212A and
Kit 2537 only.
50A52-100 Versions 2 and 3 (E91, E92)
E91 – Heating fan runs when limit opens in heating only.
E92 – SPDT Radiant Sensor
50A52-101 Version 4 (E93, E1, E2, E3)
50A52-102 (E90, E4)
E93, E1 – Same as 50A52-100 E93 with addition of protective
housing and LVTB screw connections.
E2 – Radiant sensor must be in cold position before hot
surface ignitor can be energized.
E3, E90, – 12 second mimimum, 30 second maximum HSI
E4 warm-up time.
50A52-102
E90, E4 – 90 second indoor fan off delay in cooling mode.
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