Compressors; Filters; Power And Control Wiring; Condensate Drain - York ZH078 Installation Manual

for piping inside the roof curb. Trap the connection per Figure 21.
The trap and drain lines should be protected from freezing.
Plumbing must conform to local codes. Use a sealing compound
on male pipe threads. Install condensate drain line from the 1
inch NPT female connection on the unit to an open drain.
3" Minimum
Figure 21: Condensate Drain

Compressors

The scroll compressor used in this product is specifically
designed to operate with R-410A Refrigerant and cannot be
interchanged.
This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system.
The compressor also uses a polyolester (POE oil), Mobil 3MA
POE. This oil is extremely hygroscopic, meaning it absorbs water
readily. POE oil can absorb 15 times as much water as other oils
designed for HCFC and CFC refrigerants. Take all necessary
precautions to avoid exposure of the oil to the atmosphere.
Do not leave the system open to the atmosphere. Unit
damage could occur due to moisture being absorbed by
the POE oil in the system. This type of oil is highly
susceptible to moisture absorption
POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.
Johnson Controls Ducted Systems
Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking) to occur in one year
or more. When performing any service that may risk
exposure of compressor oil to the roof, take precautions
to protect roofing.
Procedures which risk oil leakage include, but are not limited to,
compressor replacement, repairing refrigerant leaks, replacing
refrigerant components such as filter drier, pressure switch,
metering device or coil.
Units are shipped with compressor mountings which are
factory-adjusted and ready for operation.
Do not loosen compressor mounting bolts.

Filters

Two-inch filters are supplied with each unit. One-inch filters may
be used with no modification to the filter racks. Filters must
always be installed ahead of evaporator coil and must be kept
clean or replaced with same size and type. Dirty filters reduce
the capacity of the unit and result in frosted coils or safety
shutdown. Refer to physical data tables, for the number and
size of filters needed for the unit. The unit should not be
operated without filters properly installed.
Make sure that panel latches are properly positioned on
the unit to maintain an airtight seal.

Power And Control Wiring

Field wiring to the unit, fuses, and disconnects must conform to
provisions of National Electrical Code (NEC), ANSI/NFPA No.
70 – Latest Edition (in U.S.A.), current Canadian Electrical
Code C221, and/or local ordinances. The unit must be
electrically grounded in accordance with NEC and CEC as
specified above and/or local codes.
Voltage tolerances which must be maintained at the
compressor terminals during starting and running conditions are
indicated on the unit Rating Plate and Table 1.
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