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Service and Warranty Procedure
Replacement Parts
When writing to McQuay for service or replacement parts,
provide the model number, serial number, and unit part num-
ber of the unit as stamped on the serial plate attached to the
unit. For questions regarding wiring diagrams, it will be nec-
essary to provide the number on the specific diagram. If
replacement parts are required, include the date of unit instal-
lation, the date of failure, an explanation of the malfunction,
and a description of the replacement parts required.
Compressor
McQuay Rooftops use the following Copeland Scroll Com-
pressors.
1. Single compressors, one per refrigerant circuit
2. Tandem compressors, basically two compressors specifi-
cally manufactured by Copeland into a single assembly.
3. Trio compressors, basically three single compressors fac-
tory piped in parallel with equalization lines.
Scroll service replacement compressors for McQuay Rooftop
Units can be obtained from two sources.
McQuay Service Parts maintains a stock of replacement
compressors.
Copeland Refrigeration has stocking wholesalers throughout
the U.S. who maintain a limited stock of replacement scroll
compressors. The stock of single compressors is much better
than the stock of tandems "tandem/trio ready", single com-
pressors. Trios are almost never in wholesaler stock and are
not recommended for use on McQuay Rooftops due to piping
interference. Copeland does offer quick ship options though
their wholesalers.
Both sources can be used, at the customer’s discretion, within
the following limitations.
1. RPS18-20 (with single compressors. No limitations).
2. RPS25-30 (with single and tandem compressors).
a.If any part of the tandem fails then the entire tandem
must be replaced. Both sources are acceptable.
b.Single compressor. No limitations.
3. RPS36 (with tandem compressors).
a.Circuit #1 tandem - If any part of the tandem fails then
the entire tandem must be replaced. Both sources are
acceptable.
b. Circuit #2 tandem - Each of the tandem’s compressors
have a rotalock and only the failed portion of the tandem
may need replacement. See below.
4. RPS40-60 - Each of the tandem’s compressors have a
rotalock and only the failed portion of the tandem may
need replacement. See below.
5. RPS70-75 - Each of the tandem’s compressors have a
rotalock and only the failed portion of the tandem may
need replacement. See below.
The decision to replace the failed portion of the tandem or
trio, as opposed to replacing the entire tandem or trio, must
be decided based on the following.
1. The entire tandem must be replaced if the individual por-
tions do not include rotalocks and rotalocks are not avail-
able on the RPS25-30 (tandems and the RPS circuit #1
tandem).
2. In warranty - Warranty will only cover replacement of the
failed portion of the tandem or trio. Either source may be
used.
3. Out of warranty - The customer decides whether to
replace the entire tandem / trio or just a portion and either
source may be used.
4. Only a "tandem or trio ready" compressor, with oil equal-
izer lines, can be used to replace a portion of the tandem
or trio.
When replacing an "in warranty" compressor through a
Copeland Wholesaler, take the failed compressor to the
wholesaler for an over-the-counter or an advanced replace-
ment exchange. Credit is issued by Copeland on the returned
motor compressor upon receipt and factory inspection of the
inoperative motor compressor. In this transaction, be certain
that the motor compressor is definitely defective. If a motor
compressor is received from the field that tests satisfactorily,
a service charge plus a transportation charge will be charged
against its original credit value.
In-Warranty Return Material Procedure
Material other than compressors may not be returned except by
permission of authorized factory service personnel of McQuay
International at Minneapolis, Minnesota.
A "return goods" tag will be sent to be included with the
returned material. Enter the information as called for on the
tag in order to expedite handling at out factories and issuance
of credits. All parts shall be returned to the factory desig-
nated on the return goods tag, transportation charges prepaid.
The return of the part does not constitute an order for
replacement. A purchase order for the replacement part must
be entered through your nearest McQuay representative. The
order should include the component's part number and
description and the model and serial numbers of the unit
involved.
If it is determined that the failure of the returned part is due
to faulty material or workmanship within the standard war-
ranty period, credit will be issued on the customer's purchase
order.
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