Carrier 25VNA8 Instruction Manual download pdf (Page 5)

Outdoor Unit Connected to Factory--Approved Indoor

Unit

Outdoor unit contains correct system refrigerant charge for

operation with factory-- approved, AHRI--rated indoor units when

connected by 15 ft. (4.57 m) of field--supplied or factory--accessory

tubing, and factory--supplied filter drier. Check refrigerant charge

for maximum efficiency.

NOTE: If the indoor furnace coil width is more than the furnace

casing width, refer to the indoor coil Installation Instructions for

transition requirements.

Install Liquid--Line Filter Drier Indoor

Refer to Fig. 4 and install filter drier as follows:

1. Braze 5 --in. (127 mm) liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to above 5 --in. (127 mm) liquid tube.

4. Connect and braze liquid refrigerant tube to the filter drier.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in unit damage or

improper operation.

Installation of filter drier in liquid line is required.

A05227

Fig. 4 -- Liquid--Line Filter Drier

Refrigerant Tubing connection Outdoor

Connect vapor tube to fitting on outdoor unit vapor service valves

(see Table 1).

No Installation of Adapter Tube

Although it is a heat pump this unit has a standard AC liquid

service valve. An EXV inside the unit serves as the heating

expansion device.

Sweat Connections

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

S Use a brazing shield

S W rap service valves with wet cloth or heat sink material.

Use refrigerant grade tubing. Service valves are closed from factory

and ready for brazing. After wrapping service valve with a wet

cloth, braze sweat connections using industry accepted methods

and materials. Consult local code requirements. Refrigerant tubing

and indoor coil are now ready for leak testing. This check should

include all field and factory joints.

Evacuate Refrigerant Tubing and Indoor Coil

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the

recommended deep vacuum method of 500 microns. The alternate

triple evacuation method may be used. See Service Manual for

triple evacuation method. Always break a vacuum with dry

nitrogen prior to opening the refrigerant system for servicing.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gauge capable of

accurately measuring this vacuum depth. The deep vacuum method

is the most positive way of assuring a system is free of air and

liquid water. (See Fig. 5)

500

MINUTES

01234567

1000

1500

LEAK IN

SYSTEM

VACUUM TIGHT

TOO WET

TIGHT

DRY SYSTEM

2000

MICRONS

2500

3000

3500

4000

4500

5000

A95424

Fig. 5 -- Deep Vacuum Graph

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both indoor

and outdoor unit has not shifted during shipment. Ensure tubes are

not rubbing against each other or any sheet metal. Pay close

attention to feeder tubes, making sure wire ties on feeder tubes are

secure and tight.

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Carrier 25VNA8 Instruction Manual Page 5

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