McQuay CUB-007S Installation Manual

BULLETIN NO. IM 116

JANUARY 1968

FORM 2164341

INSTALLATION AND

MAINTENANCE DATA

MODEL CUB

AIR COOLED CONDENSING UNIT

7

1/2

THRU 60 TONS

INC.. 13600 INDUSTRIAL PARK BLVD.. P.O. BOX 1551, MINNEAPOLIS, MINNESOTA 55440

PHONE: [phone]. AREA CODE: 612

INTRODUCTION

McQUAY SEASONCON air cooled condensing units are

for outdoor installation, basically designed for use
with direct expansion coils, air handling units, or
water chillers. The SEASONCON air cooled

ing units are factory assembled on a single base,

wired, evacuated, performance tested, given a holding

refrigerant charge, and shipped ready for installation.

Each unit consists of accessible hermetic

condens-

compress-

NOMENCLATURE

117

CUB-027s 1

D

1

INSTALLATION

GENERAL Commerical equipment of this type is in-

tended for installation by qualified refrigeration me­chanics only. As a condition of the warranty the check,
test, and startup procedure must be performed by such
personnel and properly reported on the form provided.

Failure to do so voids the warranty. Arrangement for

service should be made prior to installation, as it is
not included in the warranty or the catalog price. See
warranty terms on Page 3.

INSPECTION When the equipment is received, all
items should be carefully checked against the bill of
lading to be sure all crates and cartons have been

received. All units should be carefully inspected for

damage when received. Visible or concealed damage
should be reported immediately to the carrier and a

claim

filed fordamage. The electrical nameplate should

be checked to be sure it agrees with the power supply
available.
LOCATION The
ing units are designed for outdoor application. The

evaporator and accessories connected to the unit are
ordinarily installed indoors.

The cabinet is made of heavy reinforced aluminum

panels to give a fairly light but durable unit.

The condensing unit should be located so that all
four sides of the unit have free area for inlet air flow.
The unit should not be located closer than one fan

diameter from a wall or other obstructions. The units

have an
in from the underside of the unit.

ished with suitable holes in the legs and channels for
use by the riggers. See Figure 1, Page 5.

man has free access to the compressor compartment

and to the access panel and the condenser fans and

motors. If the location of the
tion may be transmitted objectionably to the building+
vibration isolators should be used.

upflow

The unit must be mounted level. The unit is furn-

The unit location should be such that the service

McQUAY

condenser air discharge, with air taken

line of air cooled condens-

unit

is such that

vibra-

or(s) (single, dual, or tandem), air cooled condenser
with propeller fans & motors and a completely wired
control panel in a heavy aluminum cabinet. The con­trol panel includes a power terminal block, circuit

breaker protection for all motor phases, starting
tactors,
ready for operations.

SERVICEABILITY The compressor compartment is
accessible from the top and two sides by simply re­moving panels. Under no condition should any access
panel be blocked or locked in place by mounting parts
on them or running piping through them.

area has generously sized access doors for checking
the fan motors, belts, and drive. On direct drive units
access is through the fan orifice.

enclosure having a

the first section of the line proper.

that vibration from the unit is not transmitted from the

equipment to the bui
joints
or flexible connectors in the lines will be required.
All refrigeration lines must be checked and secured to
prevent wear or vibration at all operating conditions.

and safety and overload controls, wired and

Air Cooled Condensing Unit
Series Designation

Nominal Capacity (Tons)

Single Compressor
Dual Compressors

Tandem Compressor

On the belt driven fan units, the condenser fan motor

The control panel is protected by a weather proof

REFRIGERANT PIPING The refrigerant piping should
be installed according to standard practice and should
follow latest

the motor-compressors are resilient mounted, it is
necessary that a vibration eliminator be installed be­tween the suction connection on the compressor and

There must be sufficient flexibility in the piping so

at the unit are not stressed. Loops, hairpins,

A filter-drier must be installed in the liquid line to

pick up acids, dirt and moisture that may be left in

the system. A moisture indicating sight glass, located

in the liquid line, must also be installed. A suction

line filter is also recommended to prevent grit or dirt

from getting to the compressor.

The unit is furnished with a liquid line shut off

valve located ot the subcooler outlet.

It is urged that dry nitrogen be run through the con­necting refrigerant lines during the brazing operation
to prevent oxidation of
joints are not acceptab e.

CONTROL PANEL All operational and refrigerant

safety controls are located in the control panel. Also

note following section on fuses and circuit breakers.

ASHRAE

gasketed

and hinged door.

guide recommendations. In that

Iding,

and so that the brazed

iping

P

interior. Soft soldered

con-

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