Refrigerant and Chilled Water Piping Access Holes

Unit Isolation Ð Where extremely quiet operation is essential, install isolators between ¯oor 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 Ð

The 40RM Series units come with standard knockouts for refrigerant and chilled water piping. These knockouts are lo- cated on both sides of the unit for installation ¯exibility. The standard knockouts provide sufficient access to the unit's coils for all 40RM and some 40RMQ units, however, for 40RMQ016 and 40RMS units, additional holes must be ®eld-fabricated to accommodate the piping. See Fig. 4 for the positions and dimensions of the additional access holes required for these units, including hole diameters and drilling dimensions. Rec- ommended access hole use is also listed for all units. Note that Fig. 4 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.

Refrigerant Piping Ð See Tables 1A, 1B, 1D, 1E for refrigerant pipe connection sizes. For ease in brazing, it is recommended that all internal solder joints be made before unit is placed in ®nal position.

The 40RM and 40RMQ direct-expansion units have internal factory-installed thermostatic expansion valves (TXVs), distributors, and nozzles for use with R-22. See Table 2 for part numbers. Knockouts are provided in the unit corner posts for 40RM and 40RMQ008 and 012 refrigerant piping. The 40RMQ016 unit requires additional ®eld-fabricated piping access holes. See Fig. 4, which also lists recommended knock- outs and access holes to use for each 40RM and 40RMQ unit size. Recommended ®ttings 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 suc- tion line, outside the unit. See Fig. 5.

USE HOLE

FIELD-FABRICATED HOLE DIAMETERS,

FIELD-FABRICATED HOLE POSITION

UNIT

in. (mm)

DIMENSIONS, in. (mm)

NUMBERS

No. 5

No. 6

No. 7

No. 8

40RM007,008

1, 3

40RMQ008

40RM012-034

1, 2, 3, 4

40RMQ012

40RMS008-012

4, 5

13¤4 (44.5)

6.25 (158.8)

40RMS014-024

4, 5, 6, 7

13¤4 (44.5)

3.0

(76.2)

6.0 (152.4)

10.5 (266.7)

40RMQ016

3*, 5, 6, 7

11¤8 (28.6)

13¤4 (44.5)

3.25 (82.6)

6.125 (155.6)

10.38 (263.7)

40RMS028,034

5, 6, 7, 8

21¤2 (63.5)

21¤2 (63.5) 6.0

(152.4)

9.625 (244.5)

13.38 (339.9)

17.0 (431.8)

*Must be enlarged from 11¤8 in. to 13¤4 inches.

NOTE: Access hole knockouts 1-4 are factory-supplied.

Carrier 40RMQ, 40RMS Refrigerant and Chilled Water Piping Access Holes, Numbers

Refrigerant and Chilled Water Piping Access Ð

UNIT

NUMBERS

Fig. 4 Ð Refrigerant and Chilled Water Piping Access Holes