13
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*25, 28, and 30 units.
40RUQ*25 units, as well as 40RUS*25, 28, and 30 units
require additional holes which must be field--fabricated to
accommodate the piping. See Fig. 8 for the positions and
dimensions of the additional access holes required for
40RUQ 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
D
8
C10727
UNIT
USE HOLE
NUMBERS
FIELD--F ABRICATED HOLE DIAMATERS
in. (mm)
FIEL D--FA B R IC AT ED H OLE POSIT ION DIMENSIO N S
in. (mm)
No. 5 No. 6 No. 7 No. 8 A B C D
40RUA*25, 28, 30 1,2, 3, 4 — — — — — — — —
40RUS*25 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*25 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)
40RUS*28, 30 5, 6, 7, 8 2
1
/
2
(63.5) 2
1
/
2
(63.5) 2
1
/
2
(63.5) 2
1
/
2
(63.5) 6.0 (152.5) 9.625 (244. 5) 13.38 (339. 9) 17.0 (431.8)
{
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
