Marvair AVP 24 Manuel télécharger pdf (Page 12)

ComPac 6/09-18

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

The Extreme Duty Package allows selected Marvair

ComPac

I & ComPac

II air conditioners to

operate in extremely cold and hot ambient conditions. The Extreme Duty Kit is always factory installed

and is available on all ComPac

air conditioners. ComPac

I air conditioners (non-economizer units)

will operate from 0° F to 130° F (-18° to 54°C). ComPac

II air conditioners (economizer units) will

operate from -20° F to 130° F (-29° to 54°C).

The Extreme Duty Package includes a suction line accumulator, thermal expansion valve (TXV),

crankcase heater, hard start kit, an auto reset, adjustable 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.

Coastal Environmental (ComPac® I A/C Only)

Recommended for units to be installed near an ocean or on seacoast. Includes corrosion resistant

fasteners, sealed condenser fan motor, protective coating applied to all exposed internal copper in the

condenser section and a protective coating on the condenser coil.

Stainless Steel Cabinet (ComPac® I A/C Only)

All sheet metal constructed of stainless steel.

Hot Gas Bypass (ComPac® I A/C Only)

Used in specialty applications; i.e., Magnetic Resonance Imaging (MRI) buildings, to prevent magnetic

voltage disturbance caused by compressor cycling. Two hot gas bypass option packages are available

to allow operation to 20°F (-7°C) or minus 20°F (-29°C). Please refer to Hot Gas Bypass Application

Bulletin for details.

Electric Reheat Dehumidication

A humidity controller (p/n 50057) allows electric heat and cooling to operate simultaneously. Marvair

air conditioners equipped with the dehumidication option allow the indoor humidity of the controlled

environment to be maintained at or below a certain humidity set point. These units do not have the

ability to add humidity to the building.

IMPORTANT: The electrical wire and breaker or fuses must be sized for simultaneous operation

of the electric heater and the air conditioner. Refer to the data sticker on the unit or the ComPac

Air Conditioner Product Data Sheet for the sizing information.

Dehumidication is achieved by operating mechanical cooling in conjunction with electric reheat. The

strip heat is sized approximately to the sensible capacity of the total tonnage of the machine (i.e., on a

24,000 BTU unit the strip heat is sized at approximately 20,000 BTU). Because the strip heat is sized

to the approximate sensible cooling capacity, only selected models are available.

Operation:

When the humidity rises above the set point on the humidity controller both mechanical cooling and

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Marvair AVP 24 Manuel Page 12

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