McQuay AMB 35 Installation Manual

ULLETIN

INSTALLATION AND

MAINTENANCE DATA

NO. IM 104

REVISED MAY 1967

-2

AMD-AMB

AIRCONS”

AIR COOLED CONDENSERS

.13600

INDUSTRIAL PARK BLVD., MINNEAPOLIS, MINNESOTA 55427 1 PHONE: 377-9750

AREA CODE: 612

GENERAL INFORMATION

ASSEMBLY OF UNITS

INSTALLATION OF UNITS

DIMENSIONAL DATA

PIPING

PIPING DIAGRAMS

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GENERAL

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.........

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4-5

6-7

INFORMATION

INSPECTION

When the equipment is received, items should be

carefully checked against the bill of lading to

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 for damage. All motor nameplates should be checked to be sure they agree with the power supply available.

RIGGING AND MOVING UNITS

The exact method of handling and setting the Aircon

depends on available equipment, size of unit, final

location, and other variables. It is therefore up to the

judgment of the riggers and movers to determine the

specific method of handling each unit. All units are shipped on heavy skids and all vertical airflow units have rigging holes in the legs. In addition, all the larger units have rigging holes in each end of the

base channels for aiding in handling of the units. See Figure 2 for suggested rigging.

Under no circumstances should the coil headers or

return bends

used in moving

these units.

LOCATION

A. General -The

marily for outdoor location. The fan motors are enclosed within the cabinet for their protection on AMB units. Motors are totally enclosed type

McQuay

Aircon is designed pri-

RECEIVER AND OPERATING

CHARGE.

ELECTRICAL WIRING.

START UP

OPERATION

MAINTENANCE.

REPLACEMENT PARTS

AMD

doors, the air leaving the unit should be discharg-

the

ed to warmed air through the unit.

AMD & AMB Horizontal Aircons.

type

flow

(inlet air side) facing the prevailing winds. Where strong winds are common, it is recommended that a wind deflector be used to discharge the air ver-

tically

capacity during varying wind conditions. The wind deflector should be installed on the fan side of the

unit. The wind deflector is shipped knocked

down,

units

are tance tween unit and wall. If it is absolutely necessary to have the unit positioned so that the air discharge the wall a distance of not less than d

iameter

AMD & AMB Vertical Aircons.

type units should be fan diameter from a wall or other obstruction. If two or area, at least one fan diameter distance should be maintained between adjacent units. Sufficient free area should be left around and below unit to

avoid air restriction

required

not

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units. If the unit is to be installed in-

outdoors to prevent

units should be installed with the coil

from

the unit, so as to prevent loss of

complete

installed with coil facing a wall, a dis-

at least

of the fan.

with assembly instructions. If

24”

should be maintained be-

toward a wall. it should be

units are to be positioned in the same

for vertical

9-10

............

.12-19

...........

re-circulation

Horizontal air

Vertical air flow

located no closer

coil. Wind deflectors are

Aircons.

of the

spaced

1-1/2

times the

than one

from

Page 2

ASSEMBLY OF UNITS

GENERAL

‘-

Aircons except for the mounting legs, wind deflectors, and head pressure control packages. Mounting legs and wind deflectors are furnished with nuts and washers.

LEG ASSEMBLY (Horizontal

AMD

tional sets of holes for mounting. These holes are

furnished so that the legs can be positioned on the unit at different leg heights. The location of cross piece “A”, of the unit above

On horizontal air flow units, the electric damper

motor, when furnished, is to bc installed on the under

are usually shipped completely assembled,

necessary

Aircons)

units are furnished with legs that have addi-

shown in Figure 1, determines the height

the

base.

bolts,

side of the damper section at the end nearest the damper arm. See Figure 11, Page 16.

LEG ASSEMBLY

The legs of the vertical air flow units

adjustable. The legs are most easily assembled to the unit when the unit is still in the upright position, as

shipped.

work by 4 bolts furnished with the unit.

On vertical airflow units, when face dampers and electric damper motors are used, it is necessary that the leg

damper motor bracket be assembled to the corner nearest the damper arm on the damper section. See Figure 10, Page 16.

Each leg is fastened to the angle frame-

furnished

with the additional holes for the

(vertical Aircons)

are

not

FIGURE 1

HORIZONTAL

LEG ASSEMBLY

VERTICAL LEG

HOLES FOR HEIGHT ADJUSTMENT (AMD

ANGLE B

MODELS)

FIGURE 2 SUGGESTED RIGGING

U--\

AMB 50 THRU

8 THRU 30

AMD

20 THRU 45

AMB

140

INSTALLATION OF UNITS

The Aircon must be installed level to insure proper

drainage of liquid refrigerant and oil. Mounting holes

3/4"

diameter are provided on all models. See

ures 3

and 4. Sleepers are normally required when distribution of load is necessary. ished

with single section coils as standard on

two

(2)

smaller sizes, the

section coils of equal capacity are furnished as

AMD-8

Aircons

and

AMD-10.

Fig-

are furn-

the

Two

standard on all other sizes. All models are available with coils circuited for use with multiple compressors. On furnished with reference numbered tags for cation relat sions

See Tables 1 & 2.

multi-section Aircons, each section is

identifi-

ing

to the proper compressor. For dimen-

and

weights of horizontal and vertical

Aircons,

Page 3

DIMENSIONAL DATA

TABLE 1

2- :: r:g, I:$&

ij.$%

2-l'/,

2-l

2-2

2-42 2-42 2-42

2-42 2-42

DIMENSIONAL AND PHYSICAL DATA

:,,L’ g?

15'.;

123

937;

58%

58?~

87',

79'ii

29?<

377,, 99:/,

111'4

121%

58'4

58'/;

58'/,

58s;

24:/,

54%

59%

r,;

1’~

TABLE 2

NET WEIGHTS-LBS. (APPROX.)

(WITHOUT REFRIGERANT CHARGE)

130 160 160 160 160 160 160 600

600

600 600

Page 4

('IFace

damper on one fan section only.

DIMENSIONAL DATA

FIGURE 3

,p-B---_l/

=/i’

DIA.

ANCHOR HOLES

FIGURE 4

INLET FACE

DAMPER

(OPTIONAL)

WIND DEFLECTOR

f0prf0~At)

VERTICAL AIR FLOW TYPE

ELECTRIC

JUNCTION BOX

MAX.7

INLET

CONN

OUTLET CONN.

,--p

INLET

FACE DAMPERS

~~PTIoNAL)

ONE SECTION

ONLY

HORIZONTAL AIR

MAX _cl

--~ pAp

NOTE:

RIGHT HAND UNIT SHOWN LEFT HAND UNIT AVAILABLE

FLOW TYPE

NOTE

RIGHT HAND UNIT SHOWN LEFT HAND UNIT AVAILABLE

ACCES:

DOOR!

HOT GAS

HORIZONTAL

r’

CONNECTION

MANIFOLDS

VERTICAL

UNITS

HAVE SINGLE

INLET AND

OUTLET CONN

LEGS

,,/-AMD

DIM “C” MAY BE INCREASED 6”

ACCESS

DOORS BOTTOM

_--_:,I

AMB 50.75

CONTROL PANELS

FANTROL AND DAMPERTROL

ADJ.-

UNITS

Page 5

PIPING

GENERAL

The design of refrigerant piping for air cooled densers involves a number of considerations not commonly associated with other types of condensing equipment. The following text is intended for

a general guide to sound, economical and trouble-free

piping of air cooled condensers.

Discharge

lines involves two objectives:

1. To minimize refrigerant pressure drop, since high pressure losses ser horsepower per ton of refrigeration.

2. To maintain sufficiently high gas velocity to carry oil through to the receiver at all loading conditions.

Liquid to allow free drainage of refrigerant from denser coil to the receiver. If this is not done, the liquid will build up in

denser coil,reduce the effective surface and

cause increased operating head

line should

may cause gas binding in the receiver. The liquid

line should be sized so the liquid velocity from

the condenser coil to the receiver

100 feet per minute. Beyond this velocity the

flow of liquid prevents air or other

si bles from passing back through the liquid line into the condenser coil.

Line

Sizing-Table No. 3 should be used as a guide to proper sizing of discharge and liquid lines. The discharge on tons of refrigeration resulting in a line sure drop per 100 feet. of equivalent, pipe length corresponding to 2 degrees F change temperature. The liquid based on a maximum of 100 denser to receiver liquid velocity.

Lines

-The proper design of discharge

cause

Lines

-The liquid line must be

the

free of any

traps

line

capacities are based

line

capacities shown are

increased compres-

condenser

bottom of the

pressure.

or loops which

does

not exceed

non-conden-

feet

per minute con-

con-

use

coil and

designed

the

con-

This

pres-

saturation

TYPICAL ARRANGEMENTS

In this case the design of the discharge line is very critical tion, the gas velocity might be too low at reduced

loads to carry oil up through the discharge line

condenser

and size

would increase the gas velocity sufficiently

reduced

at ing at sized. pressure drop. This condition can one of’

The d the

and an the pressor.

2. A shown be sized to carry the oil at minimum load conconditions and line

that at the full load condition both lines would

have sufficient flow velocity to carry the oil to the condenser.

Figure 7, Page 8, illustrates another very common

application where the Aircon is located

tially

cciver. The principal problem encountered with this arrangement is that there is frequently insufficient liquid refrigerant from the condenser coil to the receiver.

To guard against gas binding in the receiver and liqu are common to this arrangement, the receiver

should let as possible. The liquid line should be free of any

traps

runs,

ceiver.

If properly sized for full load condi-

coil. Reducing the discharge line

1 oad conditions; however, when operat-

full

load. the line would be greatly under-

and thereby

two

following

i schargc l

desired pressure drop at full load condition

oi 1 separator installed at the bottom of

trap

in the discharge 1 inc from the com-

double

in Figure 6, Page 8. Line “A” should

the

same

vertical

located as far below the condenser out-

or loops and if there are any horizontal

they

should be pitched down toward the re-

create an excessive refrigerant

overcome in

ways:

ine

may be properly

riser discharge line may he used as

"B"

should be sized so

level

as the compressor and

distance to allow free drainage of

buildup in the condenser coil, which

sized

essen-

for

re-

Page 6

Figure 5, Page 8 illustrates a typical piping ar-

A..

rangement involving a remote Aircon located at a higher elevation, as commonly encountered when the Aircon is on a roof and the compressor and receiver are on grade level or in a ment room.

basement

equip-

C. Figure

application where two or more separate are piped together to a single compressor.

1. It is very important that the two Aircons have

Page 8, illustrates a third very common

the

same capacity so that the refrigerant pres-

sure

drop

through each unit is equal.

Aircons

+ 14 hidden pages

McQuay AMB 35 Installation Manual

TABLE OF CONTENTS

GENERAL INFORMATION

INSTALLATION OF UNITS

ASSEMBLY OF UNITS

DIMENSIONAL DATA

PIPING