Carrier 38AH044 38AH044-134 Spécifications télécharger pdf (Page 38)

Table 15 — Main Power Connection and Control Circuit Wiring

LEGEND

kcmil — Thousand Circular Mils

*Conductors are from the safety disconnect.

†Control power is accomplished with a step-down transformer where

primary voltage is field voltage.

Step 5 — Install Accessories

LOW-AMBIENT OPERATION

Units 38AH044-084, 124, and 134

— If operating tempera-

tures below 55 F (13 C) are expected, Motormaster

V fan

motor control is recommended. Refer to separate installation

instructions for low-ambient operation guidelines.

Units 38AH094 and 104

— If operating temperatures below

45 F (7 C) are expected, Motormaster V fan motor control is

recommended. Refer to separate installation instructions for

low-ambient operation guidelines.

MISCELLANEOUS ACCESSORIES — For applications

requiring special accessories, the following packages are

available: condenser coil hail guard package, gage panel,

unloader package, unloader conversion kits, sound reduction

package, condenser coil protective grilles, compressor security

grilles, ModuPanel™ control, and thermostat transformer relay

package.

PRE-START-UP

Do not attempt to start the air-conditioning system until the

following checks have been completed.

System Check

1. Check all system components, including the air-

handling equipment. Consult manufacturers instruc-

tions. If the unit has field-installed accessories, be sure

all are properly installed and wired correctly. Refer to

unit wiring diagrams.

2. Backseat (open) compressor suction and discharge

shutoff valves. Close valves one turn to allow refriger-

ant pressure to reach the test gages.

3. Open liquid line service valves.

4. Check tightness of all electrical connections.

5. Oil should be visible in the compressor sight glasses.

See Fig. 32. An acceptable oil level in the compressor

is from

up on the sight glass. Adjust the oil

level as required. No oil should be removed unless the

crankcase heater has been energized for at least 24

hours. See Preliminary Oil Charge section on page 40,

for Carrier-approved oils.

6. Electrical power source must agree with unit

nameplate.

7. Crankcase heaters must be firmly locked into compres-

sors, and must be on for 24 hours prior to start-up.

8. Fan motors are 3-phase. Check rotation of fans during

first start-up check. Fan rotation is clockwise as

viewed from top of unit. If fan is not turning clock-

wise, reverse 2 of the power wires.

9. Check compressor suspension. On units 38AH044-

084, 124, and 134, snubber washers (for noise suppres-

sion) can be moved with finger pressure. On units

38AH094 and 104, rails allow compressors to float

freely on compressor rail springs.

10. On 38AH074,084 single-circuit units and module

38AH134B, ensure that the packaging block located

between the oil equalization tube and the compressor

cross-brace has been removed.

MAIN POWER CONNECTION CONTROL CIRCUIT

Electrical

Characteristics

(V-Ph-Hz)

Qty

Terminal

Blocks

Qty

Parallel

Conductors*

Max Wire

Size

(kcmil)

Control Power

(V)

Safety Circuit

(V)

208/230-3-60 1 6 500 115† 24

230-3-50 1 6 500 230 24

346-3-50 1 3 500 200 24

380-3-60

380/415-3-50

1 3 500 230 24

460-3-60

575-3-60

1 3 500 115† 24

IMPORTANT: Before beginning Pre-Start-Up or Start-

Up, review Start-Up Checklist at the back of this publi-

cation. The checklist assures proper start-up of a unit and

provides a record of unit condition, application require-

ments, system information, and operation at initial start-

up.

CAUTION

Crankcase heaters on all units are wired into the control cir-

cuit, so they are always operable as long as the main power

supply disconnect is on (closed), even if any safety device

is open. Compressor heaters must be on for 24 hours prior

to the start-up of any compressor. Failure to comply could

result in equipment damage.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 55 56

Commentaires sur ces manuels

Pas de commentaire

Carrier 38AH044 38AH044-134 Spécifications Page 38

Commentaires sur ces manuels

Produits connexes et manuels pour Compresseurs d'air Carrier 38AH044 38AH044-134