Safety Devices and the UPM Controller Overview
12.2 Second-Stage UPM Board
Fig. 9 Second-Stage UPM Controller Board
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[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 3)
[6] LED Status Indicator (Fault Status)
[7] Air Coil Freeze Connection (FREEZE 4)
[8] Ground Connection
[9] UPM Board Settings DIP Switch
[10] A2L Sensor
[11] 24VAC Power Common
[12] 24VAC Power Input
[13] UPM Standoff
[14] Power LED
[15] Fan (Fan in the event of an A2L leakage)
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EC Series Heat Pumps — 8733841499 (2024/05)
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