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5 REFRIGERANT CONNECTIONS
CAUTION
Gently remove the sealing plug of vapor line, use
one wrench to fix valve base, loose the nut with
another wernch, take out the flange pad and
sealing ring.
To prevent refrigerant leak, use proper tools to ensure
clean, burr-free cut.
CAUTION
TXV bulb MUST be protected (wrapped with wet
rag) or removed, while brazing the tubing.
Overheating of the sensing bulb will affect the
fuctional characteristics and performance of the
comfort coil.
Use brazing shield when brazing close to the cabinet
surface and wet rag to protect rubber grommet.
Brazing alloy should be at least 5% silver content.
6 PISTON/TXV INSTALLATION
NOTE
A piston does come pre-installed. The piston
must be removed before installing a TXV.
6.1 Piston Installation
1. Using a wrench to loosen the nut. Remove the nut and
sealing flange.
2. Check the piston sizes for each outdoor/coil combina-
tion in Table 6-1 and choose the correct piston size for
your combination.
3. If a different size piston is needed for your system
combination, remove the pre-installed piston.
NOTE
Avoid pulling the piston sleeve out when removing
the pre-installed piston.
4. Choose correct size piston from the doc pack and
insert it with correct orientation.
5. Replace outer O-ring with the O-ring provided in the
doc pack.
6. Attach the connection pipe with nut and tighten to 1/6th
turn past hand-tighten.
NOTE
MUST wrap the nut with a wet rag before
brazing.
Fig 6-1
This coil comes with a factory installed piston metering
device. See Table 6-1 for factory installed piston size.
Some system combinations will require a different sized
piston to be field installed.
* Use the piston size recommended by the outdoor unit if
available.
* Reference Table 6-2 If the outdoor unit dose not list a
piston size.
05
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