York W)036 THRU 060 Specifications download pdf (Page 12)

542300-YIM-A-1009

12 Johnson Controls Unitary Products

Ductwork

Ductwork should be designed and sized according to the

methods in Manual D of the Air Conditioning Contractors of

America (ACCA) or as recommended by any other recognized

authority such as ASHRAE or SMACNA.

A closed return duct system should be used. This will not

preclude use of economizers or outdoor fresh air intake. The

supply and return air duct connections at the unit should be

made with flexible joints to minimize noise.

The supply and return air duct systems should be designed for

the CFM and static pressure requirements of the job. They

should NOT be sized to match the dimensions of the duct

connections on the unit.

Refer to Figures 5 and 6 for bottom air duct openings. Refer to

Figure 9 for side air duct openings.

NOTE: It is recommended that, in Canada, the outlet duct be

provided with a removable access panel. It is

recommended that this opening be accessible when

the unit is installed in service, and of a size such that

smoke or reflected light may be observed inside the

casing to indicate the presence of leaks in the heat

exchanger. The cover should be attached in a manner

adequate to prevent leakage.

Condensate Drain

Plumbing must conform to local codes. Use a sealing compound

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

3/4” 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 11.

Figure 11: 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.

Units with scroll compressors have a shipping bracket which

must be removed after the unit is set in place. See Figure 12.

When fastening ductwork to side duct flanges on unit,

insert screws through duct flanges only. DO NOT insert

screws through casing. Outdoor ductwork must be

insulated and water-proofed.

This system uses R-410A Refrigerant which operates at

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

used in this system.

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.

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York W)036 THRU 060 Specifications Page 12

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