126115-UIM-D-0306
Unitary Products Group
3
ROOF INSTALLATION
When installing units on a roof, the structure must be capable of sup-
porting the total weight of the unit, including a pad, lintels, rails, etc.,
which should be used to minimize the transmission of sound or vibra-
tion into the conditioned space.
LIQUID LINE FILTER-DRIER
The air conditioning unit’s copper spun filter/dryer is located on the liq-
uid line.
NOTE: Replacements for the liquid line drier must be exactly the same
as marked on the original factory drier. See Source 1 for O.E.M.
replacement driers.
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. See Application Data Part Number 036-61920-000 for installing
tubing of longer lengths and elevation differences.
NOTE: Using a larger than specified line size could result in oil return
problems. 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" every 20 feet toward the out-
door unit to facilitate proper oil return.
OIL TRAPPING
When the outdoor unit is above the indoor coil, oil trapping is necessary.
An oil trap should be provided for every 20 ft. of rise. See Figure 2.
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 3.
6.
Use PVC piping as a conduit for all underground installations as
shown in Figure 4. 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 50 ft., see APPLICA-
TION DATA and worksheet "General Piping Recommendations
and Refrigerant Line Length" for vapor and liquid line sizing, cali-
bration of liquid line pressure loss or gain, determination of vapor
line velocity, elevation limitations, orifice 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.
Failure to do so or using a substitute drier or a granular type may
result in damage to the equipment.
R-22
Filter-Drier
Source 1 Part No.
Apply with Models
AY / AM
029-22156-000
All Models
FIGURE 2: Oil Trap
INDOOR
COIL
OUTDOOR COIL
20 Ft.
20 Ft.
10 In.
6 In.
FIGURE 3: Installation of Vapor Line
FIGURE 4: Underground Installation
Liquid
Line
Incorrect
Correct
Tape
Sheet Metal Hanger
Insulated Vapor Line
TO INDOOR COIL
Liquid Line
PVC
Conduit
Insulated
Vapor Line
TO OUTDOOR UNIT
Cap
