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Unit Isolation
Where extremely quiet operation is essential, install isola-
tors between floor and base of unit, or between ceiling and
top section of unit.
Be sure that unit is level and adequately supported. Use
channels at front and sides of unit for reference points when
leveling.
Refrigerant Piping Access
The FAS/FHS units come with standard knockouts for re-
frigerant 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
FAS240-336 units. FHS240 units require additional holes
which must be field-fabricated to accommodate the piping.
See Fig. 7 for the positions and dimensions of the addition-
al access holes required for FHS240 units. Recommended
access hole use is also listed for all units. Note that Fig. 7
shows the access holes on the control-box side of the unit;
this is the side of the unit with the coil headers, which is
used most often for piping access.
IMPORTANT: Do not bury refrigerant piping underground.
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,
USE HOLE
UNIT
NO.
a
FAS240-336
1,2,3,4
FHS240
3
b
,5,6,7
NOTE(S):
a
Access hole knockouts 1-4 are factory-supplied.
b
Must be enlarged from 1-1/8 in. (28.6mm) to 1-3/4 in. (44.5mm)
14
FIELD-FABRICATED HOLE DIAMETERS
in. (mm)
No. 5
No. 6
—
—
1-1/8 (28.6)
1-1/8 (28.6) 1-3/4 (44.5)
Fig. 7 — Refrigerant Piping Access Holes
Specifications subject to change without notice.
and nozzles for use with R-410A. See Table 5 for part num-
bers. Knockouts are provided in the unit corner posts for
FAS/FHS refrigerant piping. See Fig. 7, which also lists rec-
ommended knockouts and access holes to use for each
FAS/FHS unit size. Recommended fittings are listed in
Table 6.
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. 8.)
NOTE: Be sure to remove the Styrofoam
from the TXV. Verify that it has been removed. (See Fig. 4.)
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 evaporator coils have a face-split design. En-
sure that lower circuit of coil is first on/last off when connect-
ed to the condensing unit and/or system controls. (See
Fig. 9.)
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. 10.)
1. Third-party trademarks and logos are the property of their respective
owners.
8
7
6
5
4
3
2
1
No.7
No.8
A
—
—
—
—
3.25 (82.6)
™ 1
D
C
B
A
FIELD-FABRICATED HOLE POSITION
DIMENSIONS in. (mm)
B
C
—
—
6.125 (155.6) 10.38 (263.7)
FAS-FHS-240-336-02SI
shipping pad
D
—
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