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Operation
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the combustion air prove switch closes proving that the
combustion air inducer is operating before allowing the ig-
sensing electrode. Once the gas valve is energized the
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10-Power Exhaust Transformer T10 (J volt)
in 575V applications
B-Cooling Components
drawthrough type condenser fan is used in ZGB units.
Units are equipped with belt-drive blowers which draw air
across the evaporator during unit operation.
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stalled economizer. The evaporator coil is slab type and
tubing. In all units each compressor is protected by a high
1-Compressor B
IMPORTANT
he Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFC’s and HCFC’s) as of July 1,
1992. Approved methods of recovery, recycling
or reclaiming must be followed. Fines and/or
incarceration may be levied for non-compliance.
WARNING
Electrical shock hazard. Compressor must be
grounded. Do not operate without protective cover
over terminals. Disconnect power before removing
protective cover. Discharge capacitors before
servicing unit. Failure to follow these precautions
could cause electrical shock resulting in injury or
death.
IMPORTANT
Some scroll compressors have an internal vacuum
protector that will unload scrolls when suction
pressure goes below 20 psig. A hissing sound
will be heard when the compressor is running
unloaded. Protector will reset when low pressure
in system rises above 40 psig. DO NOT REPLACE
COMPRESSOR
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The compressor is energized by a compressor contactor.
NOTE-Refer to the wiring diagram section for specic unit
operation.
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