Carrier 25HCD Instruction Manual download pdf (Page 3)

Table 1 – Accessory Usage

Accessory

REQUIRED FOR LOW–AMBIENT

COOLING APPLICATIONS

(Below 55F / 12.8C)

REQUIRED FOR

LONG LINE APPLICATIONS*

REQUIRED FOR

SEA COAST APPLICATIONS

(Within 2 miles / 3.22 km)

Accumulator Standard Standard Standard

Ball Bearing Fan Motor Ye s{ No No

Compressor Start Assist Capacitor and

Relay

Ye s Ye s No

Crankcase Heater Ye s

Ye s

Evaporator Freeze Thermostat Ye s No No

Hard Shutoff TXV Ye s Ye s Ye s

Isolation Relay Yes No No

Liquid Line Solenoid Valve No See Long–Line Application Guideline No

Motor Master Control or

Low Ambient Switch

Ye s No No

Support Feet Recommended No Recommended

* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Piping and Longline Guideline. .

{ Additional requirement for Low–Ambient Controller (full modulation feature) MotorMasterr Control.

Make Piping Connections

WARNING

PERSONAL INJURY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could result in personal injury

or death.

Relieve pressure and recover all refrigerant before system

repair or final unit disposal.

Use all service ports and open all flow–control devices,

including solenoid valves.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

If ANY refrigerant tubing is buried, provide a 6–in (152.4

mm). vertical rise at service valve. Refrigerant tubing lengths

up to 36–in (914.4 mm). may be buried without further special

consideration. Do not bury lines longer than 36 in (914.4 mm).

Outdoor units may be connected to indoor section using accessory

tubing package or field–supplied refrigerant grade tubing of correct

size and condition. For tubing requirements beyond 80 ft,

substantial capacity and performance losses can occur. Following

the recommendations in the Residential Piping and Long Line

Guideline will reduce these losses. Refer to Table 1 for accessory

requirements. Refer to Table 2 for field tubing diameters.

There are no buried–line applications greater than 36 in. (914.4

mm)

If refrigerant tubes or indoor coil are exposed to atmosphere, they

must be evacuated to 500 microns to eliminate contamination and

moisture in the system.

Outdoor Unit Connected To Factory Approved Indoor

Unit

Outdoor unit contains approximate system refrigerant charge for

operation with approved AHRI rated indoor unit when connected

by 15 ft (4.57 m) of field–supplied or factory–accessory tubing,

and factory supplied filter drier. Some indoor units require

additional subcooling to achieve optimal heating performance.

Using Table 5 or 6– Additional Subcooling Required, check

refrigerant charge for maximum efficiency

Refrigerant Tubing and Sweat Connections

Connect vapor tube to fitting on outdoor unit vapor service valves

(see Table 2). Connect liquid tubing to adapter tube on liquid

service valve. Use refrigerant grade tubing.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Service valves must be wrapped in a heat–sinking material

such as a wet cloth while brazing.

Remove plastic retainer holding outdoor piston in liquid service

valve, leaving the piston and piston retainer inside the valve.

Connect sweat/flare adapter provided, to valve. (See Fig. 4.)

Connect refrigerant tubing to fittings on outdoor unit vapor and

liquid service valves. Service valves are closed from factory and

ready for brazing. After wrapping service valve with a wet cloth,

tubing set can be brazed to service valve using either silver bearing

or non–silver bearing brazing material. Do not use soft solder

(materials which melt below 800°F/427°C). Consult local code

requirements. Refrigerant tubing and indoor coil are now ready for

leak testing. This check should include all field and factory joints.

NOTE: Some outdoor units contain a mechanical fitting at the

liquid distributor. This connection is not field serviceable and

should not be disturbed.

A05226

Fig. 4 -- Liquid Service Valve

25HBB / 25HBC / 25HCD

Always Ask For

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

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Carrier 25HCD Instruction Manual Page 3

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