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12 Safety Devices and the UPM Controller
Overview
RL models are equipped with the Unit Protection Module (UPM)
that controls the compressor operation and monitors the safety.
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Fig. 17 UPM Controller Board
[1] Compressor Contact Output
[2] High-Pressure Switch Connection
[3] Call for Compressor (Y1)
[4] Low-Pressure Switch Connection
[5] Water Coil Freeze Connection (FREEZE 1)
[6] UPM Status LED Indicator (Fault Status)
[7] Air Coil Freeze Connection (FREEZE 2)
[8] Condensate Overflow Sensor Connection
[9] Ground
[10] UPM Settings DIP Switch (SW1)
[11] A2L Sensor
[12] 24VAC Power Common
RL Series Heat Pumps — 8733842393 (2024/05)
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Safety Devices and the UPM Controller Overview
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[13] 24VAC Power Input
[14] UPM Standoff
[15] Power LED
[16] Fan (Fan in the event of an A2L leakage)
[17] Dry Contact
When a malfunction light is used for diagnostic purposes, the
connection is made at the dry contact connection terminals of
the UPM board.
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