Marvair MAA/MGA Wall Mount AC Installation & Operation Manual
05/2023 Rev.21
11
Cabinet Color and Material
Marvair air conditioners are available in three different cabinet colors -the standard Marvair beige, white
and gray. The standard cabinet’s sides, top and front panels are constructed of 20 gauge painted steel. As
an option, these panels can be built of 16 gauge steel in beige & gray or .050 stucco aluminum. When
the 16 gauge painted steel or the aluminum is used, only the side, top and front panels are 16 gauge or
aluminum. Contact your Marvair representative for color chips. The cabinet can also be constructed of
type 316 stainless steel. Two stainless steel cabinet constructions are available- the complete cabinet,
including most internal sheet metal or only the exterior sheet metal
1.7 Electrical Operation
The compressor and condenser fan are energized with a contactor controlled by a 24 VAC pilot signal.
Some compressors incorporate an internal PTC crankcase heater that functions as long as primary power
is available. The heater drives liquid refrigerant from the crankcase and prevents loss of lubrication
caused by oil dilution. Power must be applied to the unit for 24 hours before starting the compressor.
The condenser (outside fan) motor is energized by the same contactor. However, the motor is cycled on
and off by the low ambient control (see low ambient control 1.6).
The indoor evaporator fan motor is controlled by the fan purge on the electronic control board.
