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8
9. Connecting Refrigerant Lines
11. Electrical Installation
1.
Release nitrogen hold-
ing charge by depressing the
Shrader Valve at the liquid line
connection on the air handler.
If no gas releases from the air
handler, contact distributor re-
garding potential leak.
2.
Cut off Shrader Valve fitting at
the liquid line connection. Use a
tubing cutter for this step. Clean
the burr from the cut tubing to
reduce the chance of future
leaks. Connect the liquid line to
the tubing at the indoor unit.
3.
Use a tubing cutter to remove
the spun end from the suction
line connection at the air han-
dler. Clean the burr from the cut
tubing to reduce the chance of
future leaks.
4.
To avoid heat damage to grommets where present, remove these
prior to brazing by sliding them over the refrigerant lines and out of
the way.
5.
Check to determine if the
evaporator coil has a Shrader
fitting on the suction manifold.
If yes, remove the valve core
to prevent heat damage during
brazing. Replace the valve core
once the piping has cooled.
6.
If the air handler has a TXV
metering device, remove the
sensing bulb from the suction
line prior to brazing to prevent
heat damage from occurring.
Replace the sensing bulb once
the piping has cooled.
7. Flow nitrogen through the piping when brazing.
8. Braze both refrigerant line connections using proper brazing pro-
cedures.
9. When all line connections are brazed, perform a proper system
evacuation procedure per the outdoor unit manufacturer instructions.
10.
Seal the penetration open-
ings where the lineset piping en-
ters the air handler cabinet.
1.
Following outdoor unit manufacturer instructions and recommen-
dations, charge the system with dry nitrogen to a maximum pressure
of 150 PSIG.
3.
If any leaks or are discovered, relieve system pressure and repair
leaks. Repeat steps 1-3.
4.
With no leaks or weak connections present, evacuate the system
and charge as per the outdoor unit manufacturer instructions and
specifications.
10. Leak Check
2.
Check all brazed and screw-
on line connections by applying a
soap solution to the joint. A leak
will produce bubbles in the soap
solution.
These units are designed for single phase 120 volts, 60 Hz power
supply. Wire selection and wiring must be in accordance with the Na-
tional Electric Code and/or local codes. Unit terminals are designed
to accommodate copper or aluminum wiring. If aluminum wiring is
used, please observe special precautions relative to sizing, wire con-
nections and corrosion protection.
Fig.11-1 shows the typical electrical connections required for A/C
only and heat pump applications.
Fig 11-1.
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