user manual

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Two versions are available:
1. Self-Contained Systems
2. Split Systems
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These systems feature a scroll compressor and con-
trols, expansion valve, hot gas bypass and evaporator
coil in the room unit.
Air Cooled models also include a crankcase heater
on the compressor and require field connection to
remote air cooled condenser.
Water, Glycol and GLYCOOL models also include
a coaxial condenser with field connections required
to the water or glycol coolant loop.
Water/Glycol models have 2-way WRV with bypass.
GLYCOOL models have 3-way WRV.
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These pre-charged systems feature the evaporator
coil and expansion valve in the room unit, with the
scroll compressor, and the condensing equipment
located in one of several different types of condensing
units. Pre-charged line sets are available on 3-ton
systems.
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The heart of the refrigeration system is the compres-
sor.
All self-contained evaporator units and split system
condensing units contain a high efficiency, quiet
operating scroll compressor. The compressors have
internal vibration isolating mountings, pressure
safety controls and built-in overload protection.
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The evaporator coil is designed for the high sensible heat
ratio required by electronic equipment applications. The
copper tube, aluminum fin coils are configured as A-
frame coils on downflow units and V-frame coils on
upflow units for smooth air flow through the unit.
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Every Challenger compressor has a high pressure
switch with an exclusive manual reset after high
pressure cut-out. This prevents cycling the compres-
sor at high pressure, resulting in greater efficiency
and longer compressor life.
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The externally equalized thermostatic expansion
valve smoothly controls the flow of refrigerant
through the coil and provides precise control of
superheat.
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