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Refrigerant Piping
See Tables 1-4 for refrigerant pipe connection sizes. For
ease in brazing, it is recommended that all internal solder
joints be made before unit is placed in final position.
The FAS/FHS direct-expansion units have internal factory-
installed thermostatic expansion valves (TXVs), distributors,
and nozzles for use with R-410A. See Table 8 for part num-
bers. Knockouts are provided in the unit corner posts for
FAS/FHS refrigerant piping. See Fig. 6, which also lists rec-
ommended knockouts and access holes to use for each
FAS/FHS unit size. Recommended fittings are listed in
Table 9.
The sensor bulb capillary tubes must be routed from the
TXVs inside the unit through one of the piping access holes.
Clamp the TXV sensor bulb on a vertical portion of the suc-
tion line, outside the unit. (See Fig. 7.)
Refrigerant Piping Access
The FAS/FHS series units come with standard knockouts
for refrigerant piping. These knockouts are located on both
sides of the unit for installation flexibility. The standard
knockouts provide sufficient access to the unit's coils for all
FAS150 and 180 units. FHS180 units require additional
holes that must be field-fabricated to accommodate the pip-
ing. See Fig. 6 for the positions and dimensions of the
FASFHS150-180-01SI
additional access holes required for 575J*16H units. Rec-
ommended access hole use is also listed for all units. Note
that Fig. 6 shows the access holes on the control-box side
of the unit; this is the side of the unit with the coil headers,
so it is used most often for piping access.
NOTE: Be sure to remove the Styrofoam
from the TXV. Verify that it has been removed. (See Fig. 3.)
IMPORTANT: Never attach the sensor to the suction man-
ifold. Do NOT mount the sensor on a trapped portion of
the suction line.
The FAS/FHS series evaporator coils have a face-split de-
sign. Ensure that lower circuit of coil is first on/last off when
connected to the condensing unit and/or system controls.
(See Fig. 8.)
External TXV equalizer connections are provided and
factory-brazed into the coil suction manifolds.
If suction line must be horizontal, clamp bulb to suction line
at least 45 degrees above bottom, at approximately the
4 o'clock or 8 o'clock position. (See Fig. 9.)
1. Third-party trademarks and logos are the property of their respective
owners.
Specifications subject to change without notice.
shipping pad
™1
11
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