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Reznor YDSA Operation Manual User Manual

Page 21

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Form O-Y P/N 273647R1, Page 21

Modulating Cooling

Circuit A has a modulating capacity compressor. Each modulating compressor has

a digital controller. The digital controller in the electrical compartment (See

FIGURE

1 on page 4, and FIGURE 15, page 14) is the electronic interface between the com-

pressor and the system controller. The compressor controller is connected to the unit

controller to provide protection and diagnostics for modulating compressor operation.
After a compressor shutdown, a two-minute anti-short cycle timer in the compressor

controller delays the compressor restart. The unit controller has a five-minute com-

pressor on/off time. The delay times are concurrent so total delay time is five minutes.

Compressor Handling

Do not lift compressor by copper tubing. To prevent internal damage, compressors

must ALWAYS be held upright.

The following instructions include major points of consideration that will ensure proper

installation and protect you from potential personal injury. Please use the following 13

steps as a checklist, taking each item in order before proceeding to the next. If more

information is required, contact the Reznor Service Department for Reznor

®

products.

WARNING

To avoid electrical shock, power to the compressor(s) MUST

REMAIN OFF during performance of Steps 1 through 9 below. LOCK

DISCONNECT SWITCH OFF (open).

Step 1. Verify Proper Application

Verify that the replacement compressor is identical to the model being replaced.

All system components are matched to the compressor. Replacing a compressor

with a model other than the Reznor

®

specified replacement will void the product

warranty. See part numbers for R-410A compressors in the tables on page 18.

Step 2. Determine Cause of Initial Failure and Remove the

Compressor

In order to prevent a second failure, the cause of the original failure must be

determined. Identify the cause and make the necessary repairs.

CAUTION: DO NOT LIFT compressor by copper tubing; damage will

occur. Compressor must remain upright.

WARNING

Wear eye protection and gloves when handling refrigerant or oil and

when brazing.

a) BEFORE REMOVING THE FAULTY COMPRESSOR, remove refrigerant

charge using proper recovery procedures. Call 1-800-441-9450 for the name

of the nearest Dupont authorized distributor or 1-800-ASK-KLEA (IGI) for

information on their refrigerant reclaim programs.

b) Disconnect wires. All compressor wiring is connected using a black molded

plastic plug. Remove the plug from the compressor.

c) Open access ports so that pressure does not build up in the system. Before

unbrazing stubs from the compressor, cut suction and discharge tubing with a

tubing cutter.

WARNING

Have a fire extinguisher near. The compressor contains oil. There is a

risk of fire when unbrazing stubs.

Compressor

Replacement

WARNINGS

For your safety, wear eye protection, gloves, and protective clothing

when handling refrigerant and oil and when brazing. Have a fire

extinguisher nearby. See Hazard Levels, page 2.

This manual is related to the following products: