Unit Isolation; Refrigerant Piping Access; Refrigerant Piping - International comfort products FHS Series Installation Instructions Manual

TXV
REMOVE FOAM BLOCK
TXV — Thermostatic Expansion Valve
Fig. 5 — Foam Block Location
PLUG
CONDENSATE
DRAIN
LEGEND
Accessory Line
Alternate Air Intake and Discharge
Air Intake and Discharge
NOTE: Maintain recommended clearances per Fig. 1-3.
Fig. 6 — Typical Unit Positioning

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.
508 01 1603 01
COIL
LEGEND
Specifications subject to change without notice.

Refrigerant Piping Access

The units come with standard knockouts for refrigerant pip-
ing. These knockouts are located on both sides of the unit
for installation flexibility. The standard knockouts provide
sufficient access to the unit's coils except for FHS180 and
FHS240 units. FHS180 and FHS240 units require additional
holes which must be field-fabricated to accommodate the
piping. See Fig. 8 for positions and dimensions for the addi-
tional access holes required for the FHS180 and FHS240
units. Recommended access hole use is also listed for all
units. Note that Fig. 8 shows the access holes on the con-
trol-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.
IMPORTANT:
underground.

Refrigerant Piping

See Tables 4–11 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 direct-expansion units have internal factory-installed
PLUG
thermostatic expansion valves (TXVs), distributors, and
nozzles for use with R-410A. See Table 12 for part num-
bers. Knockouts are provided in the unit corner posts for re-
frigerant piping. See Fig. 8, which also lists recommended
knockouts and access holes to use for each FAS/FHS unit
size. Recommended fittings are listed in Table 13.
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. 9.
NOTE: Be sure to remove the styrofoam shipping pad from
the TXV. Verify that it has been removed. See Fig. 5.
IMPORTANT: Never attach the sensor to the suction
manifold. Do NOT mount the sensor on a trapped
portion of the suction line.
The evaporator coils have a face-split design. Ensure that
lower circuit of coil is first on/last off when connected to the
condensing unit and/or system controls. See Fig. 10.
External TXV equalizer connections are provided and facto-
ry-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. 11.
Do not bury refrigerant piping
15