Marvair ComPac Installation & Operation Manual
12/2017 Rev.16
9
LEDs
Post Purge Wheel
Delay on Make
(Compressor Time Delay)
Wheel
1.7
Optional Controls & Packages
Hard Start Kit
Used on single phase equipment to give the compressor higher starting torque under low voltage condi-
tions. Generally not recommended on units with scroll compressors.
Extreme Duty Package (not available on AVPA12)
The Extreme Duty Package allows selected Marvair ComPac
®
air conditioners to operate in extremely
cold and hot ambient conditions. The Extreme Duty Kit is always factory installed. Non-economizer
ComPac air conditioners will operate from 0° F to 131° F (-18° to 55°C). Economizer equipped ComPac
air conditioners will operate from -40° F to 131° F (-40° to 55°C).
The Extreme Duty Package includes a suction line accumulator, thermal expansion valve (TXV),
crankcase heater, hard start kit, an auto reset, high pressure switch and an outdoor thermostat and fan
cycle switch. The fan cycle control is standard on all ComPac air conditioners and operates based upon
the liquid line pressure. The outside thermostat closes whenever the outside temperature is below 50°F
(10°C) and opens when the outside temperature is 50° F (10°C) or higher. Whenever the temperature
is below 50°F (10°C), the fan cycle switch is in the circuit; when temperatures are 50° F (10°C) or
higher, the fan cycle switch is not in the circuit. The fan cycle control is used with a TXV to prevent
excessive cycling or "hunting" of the TXV.
Protective Coating Packages
Typically only the non-economizer ComPac are used in corrosive environments, but the ComPac with
an economizer is also available with corrosion protection. Two corrosion protection packages are of-
fered- one for the condenser section (the Coastal Environmental package) and the other for the entire
unit (the Coat-All Package).
The Coastal Environmental Package includes:
• Corrosion resistant fasteners
• Sealed or partially sealed condenser fan motor
• Protective coating applied to all exposed internal copper and metal in the condenser section
• Protective coating on the condenser coil (Luvata Insitu®) contains ES2 (embedded stainless steel
pigment) technology.
The Coat all Package includes all of the above, plus:
• Protective coating on the evaporator coil (Luvata Insitu®) contains ES2 (embedded stainless steel
pigment) technology
• Protective coating on exterior and interior components and sheet metal. (Note: the internal sheet
metal which is insulated, bottom outside panel, and the internal control box are not coated)
Note:
The AVPA12 is available with the protective coatings and corrosion resistant fasteners, but does
not have a sealed condenser fan motor.
