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.
CAUTION: Do not connect manifold gauges unless trouble is
suspected. Approximately 3/4 ounce of refrigerant
will be lost each time a standard manifold gauge is
connected.
7. The quick connect outdoor unit contains enough refrigerant
charge for a matched evaporator. Refer to Table 3 for the
amount of additional charge required for some mix-
matched indoor coils. If additional charge is required, see
recommended charging methods.
SWEAT-CONNECT SYSTEMS
The outdoor units have re-usable 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 re-usable service valves are provided to
evacuate and charge per this instruction.
Serious service problems can be avoided by taking adequate
precautions to assure an internally clean and dry system.
Always use refrigeration-grade copper tubing that is internally
clean and dry for refrigerant lines. Use clean hard drawn copper
tubing where no appreciable amount of bending around ob-
struction is necessary. If soft copper must be used, care must
be taken to avoid sharp bends which may cause a restriction.
The vapor line must be insulated with a minimum of 1/2 inch
insulation (Arm-A-Flex or equivalent).
CAUTION: Dry nitrogen should always be supplied through
the tubing while it is being brazed, because the
temperature required is high enough to cause oxi-
dation of the copper unless an inert atmosphere is
provided. 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.
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.
BASE VALVE CONNECTION PRECAUTIONS
Precautions should be taken to prevent heat damage to the
fitting by wrapping a wet rag around it as shown in Figure 7.
Also, protect all painted surfaces and insulation during brazing.
After brazing - cool joint with wet rag.
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.
LABEL
LEFT-HAND THREAD
DISTRIBUTOR
ORIFICE
LIQUID LINE
FITTING
WITH #65
ORIFICE
COIL EQUIPPED
FIGURE 6 - ORIFICE LABEL
515.26-N1Y
Central Environmental Systems
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