York ZR240 Specifications download pdf (Page 13)

275864-YIM-C-0910

Johnson Controls Unitary Products 13

Figure 9: Fixed Outdoor Air Damper

Condensate Drain

Plumbing must conform to local codes. Use a sealing compound

on male pipe threads. Install a condensate drain line from the

one-inch NPT female connection on the unit to an open drain.

NOTE: The condensate drain operates in a negative pressure

in the cabinet. The condensate drain line MUST be

trapped to provide proper drainage. See Figure 10.

Figure 10: Condensate Drain

Compressors

The scroll compressor used in this product is specifically

designed to operate with R-410A Refrigerant and cannot be

interchanged.

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.

POE (polyolester) compressor lubricants are known to cause

long term damage to some synthetic roofing materials.

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.

Filters

Two-inch filters are supplied with each unit, but units can be

converted easily to four-inch filters. Filters must always be

installed ahead of the evaporator coil and must be kept clean or

replaced with same size and type. Dirty filters will reduce the

capacity of the unit and will result in frosted coils or safety

shutdown. Minimum filter area and required sizes are shown in

Physical Data Table 9.

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

This system uses R-410A Refrigerant which operates at

higher pressures than R-22. No other refrigerant may be

used in this system.

Side Supply

Air Access

Panel

Damper

Baffle

Hood

Screen

* Gasketed

Flange

Rear View

Side Return Air

Access Panel

Outdoor Air

Opening Cover

Base

Pan

Base

Rails

Drain

Plug

2”

3” Min.

Unit Condensate

Connection

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

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.

Do not loosen compressor mounting bolts.

Make sure that panel latches are properly positioned on

the unit to maintain an airtight seal.

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York ZR240 Specifications Page 13

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