Carrier 38AE Bedienungsanleitung PDF herunterladen (Seite 3)

Table 2 — Weight Distribution

UNIT

38AE

WEIGHT - lb (kg)

Oper

Support Point

A B C

012

732 (333) 142 (65)

138 (63) 225 (102)

227(103)

014

779 (354)

143 (65)

140 (64) 247 (112)

249 (113)

016

789 (359) 143 (65)

143 (65) 250 (114)

253 (115)

COIL

TOP VIEW

Step 2 — Rig and Mount the Unit

A CAUTION

Be sure unit panels are securely in place prior to

rigging.

RIGGING — These units are designed for overhead rig

ging only. For this purpose, the transverse base channels

extend beyond the sides of the unit, with holes provided in

end plates to attach cables or hooks. Rig with top skid pack

aging assembly in place to prevent unit damage by the rig

ging cable. As further protection for the coil faces, plywood

sheets may be placed against the sides of the unit, behind

the cables. Run the cables to a central suspension point so

that the angle from the horizontal is not less than 45 de

grees. Raise and set the unit down carefully.

If it is necessary to roll the unit into position, mount the

unit on longitudinal rails, using a minimum of 3 rollers.

Apply force to the rails, not the unit. If the unit is to be

skidded into position, place it on a large pad and drag it by

the pad. Do not apply any force to the unit.

Raise from above to lift unit from the rails or pad when

unit is in final position.

COMPRESSOR MOUNTING — As shipped, the compres

sor is held tightly in place by self-locking bolts. Before

starting unit, loosen self-locking boits until the

flanged washer is stiil snug but can be moved side

ways with finger pressure. Do not remove ship

ping bolts.

Step 3 — Complete Refrigerant Piping

Connections

SIZE REFRIGERANT LINES - Consider the length of

piping required between outdoor unit and indoor unit (evap

orator), the amount of liquid lift, and compressor oil re

turn. See Table 3 and also refer to Part 3 of Carrier System

Design Manual for design details and line sizing. Refer to

indoor installation instructions for additional information.

Table 3 - Liquid Line Data

UNIT

38AE

MAX

ALLOW.

LIQUID

LIFT

ft(m)

LIQUID LINE

Max Allow.

Press. Drop

psig (kPa)

Max Allow.

Temp

Loss

•F (”C)

Filter Drier and

Sight Glass

Flare Conn.*

in. (mm)

012

52 (15 8) 7 (48.3)

2(1 1) %

014

67 (20.4) 7 (48 3)

2(1 1)

016

82 (25) 7 (48 3)

2(1 1)

INSTALL FILTER DRIER(S) AND MOISTURE INDICA-

TOR(S) — Every unit should have a filter drier and liquid-

moisture indicator (sight glass). In some applications, de

pending on space and convenience requirements, it may be

desirable to install 2 filter driers and sight glasses. One fil

ter drier and sight glass may be installed at A locations in

Fig. 3. Or, 2 filter driers and sight glasses may be installed

at B locations.

Select the filter drier for maximum unit capacity and min

imum pressure drop. Complete the refrigerant piping from

indoor unit to outdoor unit before opening the liquid and

suction lines at the outdoor unit.

Fig. 3

Locations of Sight Glass(es)

and Filter Drier(s)

INSTALL LIQUID LINE SOLENOID VALVE - SOLE

NOID DROP — It is recommended that a solenoid valve

be placed in the main liquid line (see Fig. 3) between con

densing unit (38AE) and fan coil (40RR, 40RE). This valve

prevents refrigerant migration (which causes oil dilution) to

the compressor during the off cycle at low outdoor ambient

temperatures. The solenoid should be wired in parallel with

the compressor contactor coil. This means of electrical con

trol is referred to as solenoid drop control.

INSTALL LIQUID LINE SOLENOID VALVE (OP

TIONAL) - CAPACITY CONTROL - If 2-step cooling

is desired, place a solenoid valve in the location shown in

Fig. 3.

DO NOT USE A RECEIVER — No receiver is provided

with the unit. It is recommended that one NOT be used.

MAKE PIPING CONNECTIONS - Do not remove plas

tic dust plugs from suction and liquid line stubs in the com

pressor compartment until piping connections are ready to

be made. Pass nitrogen or other inert gas through piping

while brazing to prevent formation of copper oxide.

Install field-supplied thermostatic expansion valve(s) to

indoor section. If 2 thermostatic expansion valves are in

stalled for 2-step cooling, install field-supplied liquid line

solenoid valve ahead of the second expansion valve.

*lnlet and outlet.

NOTE: Figures shown are for units operating at 45 F (7.2 C) saturated suction

and 95 F (35 C) entering air

1 2 3 4 5 6 7 8 ... 11 12

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