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Unit Isolation -- Where extremely quiet operation is
essential, install isolators 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 524J 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 524J*25A, 28A
and 30A units. The 524J*25H requires additional holes
which must be field--fabricated to accommodate the
piping. See Fig. 8 for positions and dimensions for the
additional access holes required. Recommended access
hole use is also listed for all units. Note that Fig. 8 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.
IMPORTANT: Do not bury refrigerant piping
underground.
Refrigerant Piping -- See Tables 1A–1D 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 524J direct--expansion units have internal
factory--installed thermostatic expansion valves (TXVs),
distributors, and nozzles for use with R--410A. See Table 2
for part numbers. Knockouts are provided in the unit corner
posts for 524J refrigerant piping. See Fig. 8, which also lists
recommended knockouts and access holes to use for each
524J unit size. Recommended fittings are listed in Table 3.
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 suction 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 524J Series 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
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.11.
4
3
2
1
7
6
5
A
B
C
C10838
UNIT
USE HO LE
NUMBERS
FIEL D--FA B R IC ATE D HOL E DIAMATE R S
in. (mm)
FIEL D--FA BR IC ATED H OLE POS IT ION DIMENSIONS
in. (mm)
No. 5 No. 6 No. 7 A B C
524J*25A, 28A, 30A 1,2, 3,4 — — — — — —
524J*25H 3*,5,6,7 1
1
/
8
(28.6) 1
1
/
8
(28.6) 1
3
/
4
(44.5) 3.25 (82.6) 6.125 (155.6) 10.38 (263.7)
*Must be enlarged from 1
1
/
8
in.(28.6mm)to 1
3
/
4
in.(44.5mm)
NOTE: Access hole knockouts 1--- 4 are factory ---supplied.
Fig. 8 -- Refrigerant Piping Access Holes
524J