Tubing Hanger; Underground Installation; Piping Connections; Precautions During Line Installation - York 12 SEER - CMA SERIES Installation Manual

LIQUID LINE FILTER-DRIER
The air conditioning unit's copper spun bi-flow filter/dryer is located on
the liquid 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.
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.
029-22156-000
029-22157-000

PIPING CONNECTIONS

The outdoor condensing unit must be connected to the indoor evapora-
tor coil using field supplied refrigerant grade copper tubing that is inter-
nally 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.

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 and/or high temperatures must also be
insulated.
Tape and suspend the refrigerant lines as shown. DO NOT allow tube
metal-to-metal contact. See Figure 2.
5. 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
6. 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.
7. See application part number 036-61920-000 for additional piping
information.
Unitary Products Group
Apply with Models
CMA / AC2A / AL2A
2 -3 Ton
3-1/2 - 5 Ton
Sheet Metal Hanger
Liquid
Line
Incorrect
Correct
FIGURE 2: Tubing Hanger
TO INDOOR COIL
LIQUID LINE
PVC
CONDUIT
FIGURE 3: Underground Installation
ORIFICE SELECTION (ON SWEAT FIT COILS)
NOTE: The proper orifice must be installed in the indoor coil liquid line
connection prior to the connection of the refrigerant lines.
Coil is under 30 to 35 psig (inert gas) pressure.
Each coil has an orifice installed in the fitting between the liq-
uid line connection and distributor. The orifice is identified on
a label next to the liquid line connection.
The orifice shipped with the outdoor unit is based on the "most sold"
combination, but it may be changed, depending on the capacity and
efficiency of the outdoor unit, elevation differences, and/or long total line
lengths. An additional orifice(s) is shipped with most outdoor units for
the most commonly required replacement combinations. Other sizes
must be ordered from Source 1 Parts if required.
See the appropriate Tabular Data Sheet for the correct orifice size and
charge adder. If the orifice size matches, nothing further is required and
the refrigerant lines may be connected per the outdoor unit instruction.
However, if another orifice should be used, see the coil instruction for
details to change the orifice in the coil.
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.
035-19946-001 Rev. B (0804)
Tape
Insulated Vapor Line
TO OUTDOOR UNIT
INSULATED
CAP
VAPOR LINE
3