MrCool MST03 - Terminal Designation Descriptions

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Table 1. Terminal Designation Descriptions.
Terminal Designation Description
RC (see Note 1)
Power for cooling--connect to secondary side of cooling system
transformer
R (see Note 1)
Power for heating--connect to secondary side of heating system
transformer
C (see Note 2) Common wire from secondary side of cooling system transformer
Y Compressor contactor
G Fan relay
Y2 Second stage cooling
O/B/W (see Note 3) Changeover valve for heat pump systems or heat relay
AUX/W2 Auxiliary heat relay for heat pump systems or second stage heat relay
E Emergency heat relay for heat pump systems
L (see note 4) Equipment monitor for heat pump systems