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IMPORTANT:
Do not unseal refrigerant tubing until ready to fit
refrigerant lines.
There is only a holding charge of dry air in the indoor coil, therefore
no loss of operating refrigerant charge occurs when the sealing
plugs are removed.
NOTE:
TXV bulb MUST be protected (wrapped with wet rag) or
removed, while brazing the tubing. Overheating of the
sensing bulb will affect the functional characteristics and
performance of the comfort coil.
1.
Clear all A2L sensor wires well away from the braze
connections both inside and outside the coil cabinet. If
needed, the control box may be removed from the lineset
panel by pressing outward on snap and rotation out for
clearance. See Figure 14.
2.
Remove both rubber plugs from the indoor coil.
3.
Field supplied tubing should be cut square, round and free
of burrs at the connecting end. Clean the tubing to prevent
contaminants from entering the system.
4.
Run the refrigerant tubing into the stub tube sockets of the
indoor unit coil.
Capillary tubes will come
out the top of bulb when
positioned correctly.
Figure 15
18-AD47D1-1B-EN
Figure 14
Installer's Guide
PAINTED AREAS OF THE UNIT MUST BE SHIELDED
DURING BRAZING.
5.
Flow a small amount of nitrogen through the tubing while
brazing.
6.
Use good brazing technique to make leakproof joints.
7.
Minimize the use of sharp 90 degree bends.
8.
Insulate the suction line and its fittings.
9.
Do NOT allow un-insulated lines to come into contact with
each other.
When replacing the TXV bulb, reinstall the bulb in the
proper orientation.
Some models will use a spring steel clip to attach the
TXV bulb, and some models will use a hose clamp. When
supplied with a hose clamp, the clamp should be "snug"
but not "tight" - the specification is to torque the hose
clamp to 20 +/-5 in-lbs.
9.
Rewrap the TXV bulb, spring clip, and suction line with
insulation after spring clip is installed.
10. For optimal performance, the TXV bulb may be relocated
outside the coil cabinet after the field line brazing is complete.
a. Remove the bulb insulation and bulb clip/hose clamp.
b. Lace the TXV bulb it through the large coil panel grommet.
c. Assemble the TXV bulb to the field provided suction
line outside the unit using the hose clamp provided in
the documentation pack. Ensure the bulb is mounted on a
straight, smooth section of the copper line. The bulb should
be clear of any field braze joints and located away from
any bends in the pipe.
d. The recommend installation position for the TXV bulb
is parallel to the ground (on a horizontal plane). The
bulb position should be at 2 o'clock or 10 o'clock. See
Figure 16.
e. Wrap the bulb and suction with field provided insulation
after the hose clamp is installed.
SENSING BULB
Bulb position at
SUCTION LINE
2 o'clock or
10 o' clock
Figure 16
11
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Troubleshooting
