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 indoor coil. Refer to Table 4 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 indoor coil connections are copper-to-cop-
per 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 9.
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 . See Figure 10.
Valve can be opened by removing the plunger cap and fully
inserting a hex wrench into the stem and backing out counter-
clockwise until valve stem just touches retaining ring.
CAUTION: If visual verification ot the valve stem reaching the
retaining ring is impossible, stop backing out the
valve stem when the slightest increase in resis-
tance is felt. Because of the small size and there-
fore the reduced resistance, back out the liquid
valve 5 turns maximum to prevent going past the
retaining ring.
WARNING: If the valve stem is backed out past the retaining
ring, 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.
In the event the retaining ring is missing, do not
attempt to open the valve.
Replace plunger cap finger tight, then tighten an additional 1/12
turn (1/2 hex flat). Cap must be replaced to prevent leaks.
LINE INSTALLATION
Install the refrigerant lines using the following procedure:
1. Remove the cap and Schrader core from both the liquid and
vapor fitting service ports at the outdoor unit. Connect low
pressure nitrogen to the liquid line service port.
2. Braze the liquid line to the liquid fitting at the outdoor unit.
Be sure to wrap the fitting body with a wet rag. Allow the
nitrogen to continue flowing.
3. Carefully remove the rubber plugs from the indoor coil
liquid and vapor connections. Use caution, since the coil is
pressurized. Release the gas through the schrader fitting
at the liquid connection before removing cap on vapor line.
4. Braze the liquid line to the indoor coil liquid connection.
The nitrogen should now be flowing through the coil.
5. Remove the grommet from the vapor connection at the coil.
Braze the vapor line to the indoor coil vapor connection.
After the connection has cooled, replace the grommet.
FIGURE 9 - HEAT PROTECTION
FIGURE 10 - SHUT-OFF VALVE
SERVICE ACCESS
PORT WITH
SCHRADER
PLUNGER CAP
515.26-N5Y
8
Unitary Products Group
