Installation Guide

ManualsBrandsWinchester ManualsAir Conditioners1.5 Ton 14 SEER Residential Whole House Unit Sweat A/C System with 30 ft. Line Set

1183509-UIM-D-0815

4 Johnson Controls Unitary Products

PIPING CONNECTIONS

The outdoor condensing unit must be connected to the indoor evapora-

tor coil using field supplied refrigerant grade (ACR) copper tubing that is

internally clean and dry. Units should be installed only with the tubing

sizes for approved system combinations as specified in tabular data

sheet. The charge given is applicable for total tubing lengths up to 15

feet (4.6 m). See Application Data Part Number 247077 for installing

tubing of longer lengths and elevation differences.

PRECAUTIONS DURING LINE INSTALLATION

1. Install the lines with as few bends as possible. Care must be taken

not to damage the couplings or kink the tubing. Use clean hard

drawn copper tubing where no appreciable amount of bending

around obstruction is necessary. If soft copper must be used, care

must be taken to avoid sharp bends which may cause a restriction.

2. The lines should be installed so that they will not obstruct service

access to the coil, air handling system, or filter.

3. Care must also be taken to isolate the refrigerant lines to minimize

noise transmission from the equipment to the structure.

4. The vapor line must be insulated with a minimum of 1/2” foam rub-

ber insulation (Armaflex or equivalent). Liquid lines that will be

exposed to direct sunlight, high temperatures, or excessive humid-

ity must also be insulated.

5. Tape and suspend the refrigerant lines as shown. DO NOT allow

tube metal-to-metal contact. See Figure 2.

6. Use PVC piping as a conduit for all underground installations as

shown in Figure 3. Buried lines should be kept as short as possible

to minimize the build up of liquid refrigerant in the vapor line during

long periods of shutdown.

7. Pack fiberglass insulation and a sealing material such as perma-

gum around refrigerant lines where they penetrate a wall to reduce

vibration and to retain some flexibility.

8. For systems with total line length exceeding 80 feet (22.86 m), see

APPLICATION DATA and worksheet “General Piping Recommen-

dations and Refrigerant Line Length” for vapor and liquid line siz-

ing, calibration of liquid line pressure loss or gain, determination of

vapor line velocity, elevation limitations, TXV connections, system

charging, traps, etc.

PRECAUTIONS DURING BRAZING OF LINES

All outdoor unit and evaporator coil connections are copper-to-copper

and should be brazed with a phosphorous-copper alloy material such

as Silfos-5 or equivalent. DO NOT use soft solder. The outdoor units

have reusable service valves on both the liquid and vapor connections.

The total system refrigerant charge is retained within the outdoor unit

during shipping and installation. The reusable service valves are pro-

vided to evacuate and charge per this instruction.

Serious service problems can be avoided by taking adequate precau-

tions to assure an internally clean and dry system.

PRECAUTIONS DURING BRAZING SERVICE VALVE

Precautions should be taken to prevent heat damage to service valve

by wrapping a wet rag around it as shown in Figure 4. Also, protect all

painted surfaces, insulation, and plastic base during brazing. After braz-

ing, cool joint with wet rag.

Valve can be opened by removing the service valve cap and fully insert-

ing a hex wrench into the stem and backing out counter-clockwise until

valve stem just touches the chamfered retaining wall.

Connect the refrigerant lines using the following procedure:

1. Remove the cap and Schrader core from both the liquid and vapor

service valve service ports at the outdoor unit. Connect low pres-

sure nitrogen to the liquid line service port.

NOTICE

Using a larger than specified line size could result in oil return prob-

lems. Using too small a line will result in loss of capacity and other

problems caused by insufficient refrigerant flow. Slope horizontal

vapor lines at least 1" (2.5 cm) every 20 feet (6.1 m) toward the out-

door unit to facilitate proper oil return. If more than the 80 foot line

length is necessary, facilitate proper refrigerant velocity with

adjusted line diameter in accordance with the Piping Application

Guide (P/N 24077).

CAUTION

This system uses R-410A refrigerant which operates at higher pres-

sures than R-22. No other refrigerant may be used in this system.

Gauge sets, hoses, refrigerant containers, and recovery system

must be designed to handle R-410A. If you are unsure, consult the

equipment manufacturer.

WARNING

Never install a suction-line filter drier in the liquid line of an R-410A

system. Failure to follow this warning can cause a fire, injury or

death.

FIGURE 2: Installation of Vapor Line

Liquid

Line

Incorrect

Correct

Tape

Sheet Metal Hanger

Insulated Vapor Line

A0151-001

FIGURE 3: Underground Installation

CAUTION

Dry nitrogen should always be supplied through the tubing while it

is being brazed, because the temperature required is high enough

to cause oxidation of the copper unless an inert atmosphere is pro-

vided. The flow of dry nitrogen should continue until the joint has

cooled. Always use a pressure regulator and safety valve to insure

that only low pressure dry nitrogen is introduced into the tubing.

Only a small flow is necessary to displace air and prevent oxidation.

WARNING

This is not a backseating valve. The service access port has a

valve core. Opening or closing valve does not close service access

port.

If the valve stem is backed out past the chamfered retaining wall,

the O-ring can be damaged causing leakage or system pressure

could force the valve stem out of the valve body possibly causing

personal injury.

TO IND

OOR C

LIN

PVC

VAPOR LINE

A0152-001