138 RT-SVX36G-EN
Unit Start Up
Compressor Crankcase Heaters
20 - 73 and 80 ton units are equipped with 90 watt heaters installed on each compressor. 75 and
89 - 130 ton units are equipped with 160 watt heaters per compressor.
Compressor Operational Sounds
At Low Ambient Start-Up
When the compressor starts up under low ambient conditions, the initial flow rate of the
compressor is low due to the low condensing pressure. Under this condition, it is not unusual to
hear the compressor rattle until the suction pressure climbs and the flow rate increases.
Compressor – Blink Codes
The CSHN*** compressors come equipped with a compressor protection device capable of
detecting phase reversal, phase loss, and phase unbalance. The compressor protection device
uses a Green and Red LED to indicate the compressor status. A solid Green LED denotes a fault free
condition; a blinking Red LED indicates an identifiable fault condition.
Note: If the compressor has tripped, the resistance will be 4500 ohms or greater; when reset, they
will be less than 2750 ohms.
Blink Code: The blink code consists of different on / off time of the Red LED which is repeated
continuously until either the fault is cleared or until power is cycled.
Table 50. CPM Blink Codes
Fault LED on LED off LED on LED off
PTC overheat or PTC reset delay active short blink long blink short blink long blink
Phase loss long blink long blink long blink long blink
Incorrect phase sequence short blink short blink short blink long blink
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