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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 and Chilled Water Piping Access -- The
40RU Series units come with standard knockouts for
refrigerant and chilled water 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 40RUA*07, 08, 12, 14, 16 and
40RUQ*07, 08, 12 units. 40RUQ*16 units, as well as
40RUS*08, 12, 14, and 16 units require additional holes
which must be field--fabricated to accommodate the
piping. See Fig. 8 for positions and dimensions of the
additional access holes required for the 40RUQ*16 and
40RUS units. 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–1F 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 40RU 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 40RU refrigerant piping. See Fig. 8, which also
lists recommended knockouts and access holes to use for
each 40RU 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 40RU 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
C10686
UNIT
USE HOLE
NUMBERS
FIEL D---FABRICATED HOLE DIAMATERS
in. ( mm)
FIEL D---FABRI CATED HOLE POSI TI O N
DIMENSIONS, in. (mm)
No. 5 No. 6 No. 7 A B C
40RUA*07, 08
40RUQ*07, 08
1, 3 — — — — — —
40RUA*12, 14, 16
40RUQ12
1, 2, 3, 4 — — — — — —
40RUS*08, 12 4, 5 1
3
/
4
(44.5) — — 6.25 (158.8) — —
40RUS*14, 16 4, 5, 6, 7 1
3
/
4
(44.5) 1
3
/
4
(44.5) 1
3
/
4
(44.5) 3.0 (76.2) 6.0 (152.5) 10.5 (266.7)
40RUQ*16 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 and Chilled Water Piping Access Holes
40RU