York E9FD018 Series Installation Instruction Download

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Use PVC piping as a conduit for all underground installations
as shown in Figure 7. 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.

Pack fiber glass insulation and a sealing material such as
permagum around refrigerant lines where they penetrate a wall
to reduce vibration and to retain some flexibility.

Insulate all vapor lines with a minimum of 1/2" foam rubber.
Liquid lines that will be exposed to direct sunlight and/or high
temperatures must also be insulated.

ORIFICE SELECTION

YORKMATE FLOW CONTROL COILS

NOTE: The proper orifice must be installed in the indoor coil

liquid connection prior to the connection of the refrig-
erant lines.

WARNING: Sweat coil is under 35 PSIG helium pressure.

Each quick connect coil will have an orifice installed in the fitting
between the liquid line connection and distributor. The orifice
is identified on a label next to the liquid connection as shown
in Figure 8.

Sweat coils are shipped with a standard orifice in a plastic bag
attached to the liquid line connection.

The orifice that is shipped with the coil is based on the “most
sold” combination, but it may have to be changed, depending
on the capacity and efficiency of the outdoor unit, elevation
differences, and/or long total line lengths. An additional ori-
fice(s) is shipped with most outdoor units in the literature packet
for the most commonly required replacement combinations.
Other sizes must be ordered from the Parts Department if
required.

Table 4 shows the orifice and charge adjustment for approved
system combinations (indoor coil/outdoor unit). See Applica-
tion Data,"General Piping Recommendations and Refrigerant
Line Lengths" for long line lengths and elevation differences.

If the orifice sizes match, nothing further is required and the
refrigerant lines may be connected per the outdoor unit instruc-
tion. However, if another orifice should be used, see the coil
instruction for details to change the orifice in the coil.

QUICK CONNECT SYSTEMS

Indoor coils and outdoor units are to be connected with pre-
charged interconnecting tubing specified for the split systems.
The units and the lines are equipped with sealed one-time
quick-connect couplings which, when screwed together, will
have their seals broken, allowing for free passage of refriger-
ant. One end of the tubing contains a female fitting for connect-
ing to the outdoor unit. The other end has a male fitting with a
90

bend on the vapor line for connecting to the indoor coil.

The outdoor end of the lines have capped service (Schrader)
ports. Install the coupling in a position that will permit a
Schrader tool to be attached to the service port.

Prepare and connect fittings as follows:

1. Begin at either the indoor coil or the outdoor unit. Remove

only one dust cap at a time to avoid damage and to prevent
dirt from getting into the other. If necessary, carefully wipe
seals and threaded surfaces with a clean cloth.

2. Lubricate the male half diaphragm and the “O” ring with

several drops of refrigerant oil. Thread the halves together
by hand to insure proper mating of the threads. Use proper
size wrenches (on both the body hex and on the union nut)
and tighten until bodies “bottom” or a definite resistance is
felt.

3. Using a marker or ink pen, mark a line lengthwise from the

union nut to the unit panel. Then tighten an additional 1/4
turn (90

from the mark on the panel to the mark on the

union nut).

4. Repeat this procedure with the other three in the system,

removing the dust cap just prior to making the connection.

5. Leak test all refrigerant piping connections including the

service port flare caps to be sure they are leak tight.

DO NOT OVERTIGHTEN (between 40 and 60 inch-lbs.
maximum).

6. Do not remove the flare caps from the service ports except

when necessary for servicing the system.

TO INDOOR COIL