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Figure 24. Condensate drain locations for units with
staggered indoor coils
Compressor Crankcase Heaters
NOTICE
Compressor Failure!
Failure to follow instruction below could result in
compressor failure.
Unit must be powered and crankcase heaters
energized at least 8 hours BEFORE compressors are
started.
Each scroll compressor is equipped with a crankcase
heater.
The proper operation of the crankcase heater is important
to maintain an elevated compressor oil temperature during
the OFF cycle to reduce oil foaming during compressor
starts. When the compressor starts, the sudden reduction
in crankcase pressure causes the liquid refrigerant to boil
rapidly causing the oil to foam. This condition could
damage compressor bearings due to reduced lubrication
and could cause compressor mechanical failures.
Table 12. Crankcase heater sizes
Compressor Name
ZPS*
ZP*
CSHD*
VZH088*, VZH117*
VZH170*
CSHN*
Gas Heat Units
All internal gas piping is factory-installed and pressure
leak-tested before shipment. Once the unit is set into place,
the gas supply line must be field-connected to the elbow
RT-SVX063G-EN
CONDENSATE
DRAIN OPENINGS
Crankcase Heater Watts
70
90
160
located inside the gas heat control compartments.
Note: For conversion from Natural Gas to Propane refer to
the LP Converstion Kit (RT-SVN033*-EN) for part
numbers and installation instructions.
WARNING
Hazardous Gases and Flammable
Vapors!
Failure to observe the following instructions could
result in exposure to hazardous gases, fuel
substances, or substances from incomplete
combustion, which could result in death or serious
injury. The state of California has determined that
these substances may cause cancer, birth defects, or
other reproductive harm.
Improper installation, adjustment, alteration, service
or use of this product could cause flammable
mixtures or lead to excessive carbon monoxide. To
avoid hazardous gases and flammable vapors follow
proper installation and setup of this product and all
warnings as provided in this manual.
WARNING
Explosion Hazard!
Failure to properly regulate pressure could result in a
violent explosion, which could result in death, serious
injury, or equipment or property-only-damage.
When using dry nitrogen cylinders for pressurizing
units for leak testing, always provide a pressure
regulator on the cylinder to prevent excessively high
unit pressures. Never pressurize unit above the
maximum recommended unit test pressure as
specified in applicable unit literature.
Access holes are provided on the unit to accommodate a
side or bottom pipe entry.
Important: If bottom pipe entry is used, ensure the opening
in the base pan is sealed from water intrusion
into the inside of the roof curb.
Figure 25. Bottom pipe entry
Installation
41
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