Airmark GFS Series Installation manual - page 8
8
IO-123163 Effective 01-14-2016
9. Connecting Refrigerant Lines
1. Release nitrogen holding
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
regarding 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
handler. 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
procedures.
9. When all line connections are brazed, perform a proper system
evacuation procedure per the outdoor unit manufacturer instructions.
10. Seal the penetration openings where the lineset piping enters the
air handler cabinet.
1. Following outdoor unit manufacturer instructions and
recommendations, charge the system with dry nitrogen to a maximum
pressure of 150 PSIG.
3. If any leaks 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.
11. Electrical Installation
These units are designed for a single phase 120VAC, 60 Hz power
supply. Wire selection and wiring must be in accordance with the
National 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 connections and corrosion protection.
Fig.11-1 shows the typical electrical connections.
Line voltage wiring should be routed through the access holes at
the side of the air handler. Proper electrical conduit connection
fittings should be used. Connect the power wiring to the line side
connections on the air handler. The electrical ground wire should
be connected to the grounding lug. Ensure both the field supplied
ground wire and air handler GREEN ground wire are both secured
to the grounding lug of the air handler (Fig 11-2).
Fig. 11-1
Fig. 11-2