Carrier 25HCD Instruction Manual download pdf (Page 4)

Table 2 – Refrigerant Connections and Recommended Liquid

and Vapor Tube Diameters (In.)

UNIT SIZE

LIQUID RATED VAPOR

Connection

Diameter

Tube

Diameter

Connection

Diameter

Tube

Diameter

18, 24 3/8 3/8 5/8 5/8

30, 36 3/8 3/8 3/4 3/4

42, 48 3/8 3/8 7/8 7/8

60 3/8 3/8 7/8 1–1/8

* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance

data when using different size and length linesets.

Notes:

1. Do not apply capillary tube indoor coils to these units.

2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or

20 ft. (6.09 m) vertical differential 250 ft. (76.2 m) Total Equivalent Length, refer to

the Residential Piping and Longline Guideline – Air Conditioners and Heat Pumps

using Puron refrigerant.

Installing with Indoor Piston

Outdoor Unit Connected to Factory Approved Indoor Unit

Check piston size shipped with indoor unit to see if it matches

required indoor piston size. If it does not match, replace indoor

piston with correct piston size.

NOTE: Correct pistons are shipped with outdoor units in the

accessory bag and are only qualified for piston fan coils. Example

fan coils with piston: FB4C and FY5B (1.5 through 4 ton)

When changing indoor piston, use a back−up wrench. Hand

tighten hex nut, then tighten with wrench 1/2 turn. Do not exceed

30 ft−lbs. The indoor piston contains a Teflon ring (or seal) which

is used to seat against the inside of distributor body, and must be

installed properly to ensure proper seating. See Fig. 5.

13/16” BRASS HEX NUT

TEFLON® SEAL

TEFLON®

RINGS

3/4” BRASS HEX BOD

“H” DISTRIBUTOR

PISTON RETAINER

PISTON

A10342

Fig. 5 -- Indoor Piston Installation

Install Liquid Line Filter Drier Indoor

Refer to Fig. 6 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 5 in. (127 mm) long liquid tube from

step 1.

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

A05227

Fig. 6 -- Liquid Line Filter Drier

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

Installation of filter drier in liquid line is required.

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 triple evacuation

procedure in service manual). Always break a vacuum with dry

nitrogen.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gage 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. A tight dry system will hold a vacuum of 1000

microns after approximately 7 minutes. (See Fig. 7.)

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. 7 -- 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, makings sure wire ties on feeder tubes are

secure and tight.

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction of

improper voltage. See unit rating plate for recommended circuit

protection device.

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do not

install unit in system where voltage may fluctuate above or below

permissible limits.

25HBB / 25HBC / 25HCD

1 2 3 4 5 6 7 8 9 10 11 12

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