Carrier start-up and Installationshandbuch PDF herunterladen (Seite 17)

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or

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

this book. The Checklist assures proper start-up of a

unit and provides a record of unit condition,

application requirements, system information, and

operation at initial start-up.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage.

Do not attempt to start the heat pump system, even

momentarily, until the following steps have been

completed. Compressor damage may result.

CAUTION

System Check

1. Check all indoor section and other equipment auxili-

ary components. Consult the manufacturer’s instruc-

tions regarding any other equipment connected to the

condensing unit. If the unit has field-installed ac-

cessories, be sure all are properly installed and cor-

rectly wired. If used, the airflow switch must be prop-

erly installed.

2. Be sure the unit is properly leak checked and dehyd-

rated.

3. Check tightness of all electrical connections.

4. Open the liquid line and suction line service valves.

5. Be sure the unit is properly charged. See “Preliminary

Charge”, below.

6. The electrical power source must agree with the unit’s

nameplate rating.

7. The crankcase heater must be firmly attached to the

compressor crankcase. Be sure the crankcase is warm

(heater must be on for 24 hours before starting com-

pressor).

Turn On Crankcase Heater

Turn on the crankcase heater for 24 hours before starting

the unit to be sure all the refrigerant is out of the oil.To

energize the crankcase heater, proceed as follows:

1. Set the space thermostat set point above the space

temperature so there is no demand for cooling.

2. Close the field disconnect.

Preliminary Charge

Before starting the unit, charge liquid refrigerant into the

high side of the system through the liquid service valve.

The amount of refrigerant added must be at least 80% of

the operating charge listed in the Physical Data table

(Tables 1A and 1B on pages 4 and 5). Allow high and low

side pressures to equalize before starting compressor. If

pressures do not equalize readily, charge vapor on low

side of system to assure charge in the evaporator. Refer to

GTAC II, Module 5, Charging, Recover, Recycling, and

Reclamation for liquid charging procedures.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage.

Prior to starting compressor, a preliminary charge of

refrigerant must be added to avoid possible

compressor damage.

CAUTION

START-UP

38AUQ Units

The compressor crankcase heater must be on for 24 hours

before start-up. After the heater has been on for 24 hours,

the unit can be started. If no time elapsed since the

preliminary charge step was completed, it is unnecessary

to wait the 24-hour period.

Preliminary Checks —

1. Check that electric power supply agrees with unit

nameplate data.

2. Verify that the compressor crankcase heater is se-

curely in place.

3. Check that the compressor crankcase heater has been

on at least 24 hours.

4. Recheck for leaks using the procedure outlined in the

Pre-Start-Up section, Leak Test and Dehydration. If

any leaks are detected, repair as required. Evacuate

and dehydrate as described in the Leak Test and De-

hydration section.

5. Ensure that the preliminary charge has been added as

described in the Pre-Start-Up section, Preliminary

Charge.

6. All internal wiring connections must be tight, and all

barriers and covers must be in place.

NOTE: The units are factory charged with the required

amount of oil. If recharging in required, use Emkarate

RL 32-3MAF.

Compressor Rotation —

On 3-phase units with scroll compressors, it is important

to be certain that the compressor is rotating in the proper

direction. 38AUQ units are equipped with a Comfort Alert

Diagnostic Module (CADM). Alert Code 7 indicates

reverse power phasing.

To correct phase order:

1. Turn off power to the unit, tag disconnect.

2. Reverse any two of the unit power leads.

3. Reapply power to the compressor, verify correct pres-

sures.

To verify the compressor is rotating in the proper direction:

1. Connect service gages to the suction and liquid pres-

sure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the liquid pres-

sure should rise, as is normal on any start-up.

38AUQ

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