Carrier 40RFAA12 - REFRIGERANT PIPING; Refrigerant and Chilled Water Piping Access

10
Refrigerant Piping
See Tables 1-3 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 40RF direct-expansion units have internal factory-installed
thermostatic expansion valves (TXVs), distributors, and nozzles
for use with R-410A. See Table 7 for part numbers. Knockouts are
provided in the unit corner posts for 40RF refrigerant piping. See
Fig. 6, which also lists recommended knockouts and access holes
to use for each 40RF unit size. Recommended fittings are listed in
Table 8.
The sensor bulb capillary tubes must be routed from the TXVs in-
side 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. 7.)
Refrigerant and Chilled Water Piping Access
The 40RF Series units come with standard knockouts for re-
frigerant and chilled water piping. These knockouts are located
on both sides of the unit for installation flexibility. The stan-
dard knockouts provide sufficient access to the unit’s coils for
all 40RFA*07, 08, and 12 and 40RFQ*07, 08, and 12 units.
40RFS*08 and units require additional holes that must be
field-fabricated to accommodate the piping. See Fig. 6 for the
positions and dimensions of the additional access holes required
for 40RFS units. Recommended access hole use is also listed for
all units. Note that Fig. 6 shows the access holes on the control-
box side of the unit; this is the side of the unit with the coil head-
ers, so it is used most often for piping access.
NOTE: Be sure to remove the styrofoam shipping pad from the
TXV. Verify that it has been removed. (See Fig. 3.)
The 40RF 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. 8.)
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. 9.)
Fig. 6 — Refrigerant and Chilled Water Piping Access Holes
IMPORTANT: Never attach the sensor to the suction manifold.
Do NOT mount the sensor on a trapped portion of the suction
line.
Table 7 — Factory-Installed Nozzle and Distributor Data
UNIT COIL TYPE STD
TXV
QTY...PART NO.
DISTRIBUTOR
QTY... PART NO.
FEEDER TUBES PER
DISTRIBUTOR
a
QTY...SIZE (IN.)
NOTE(S):
a. Feeder tube size is 1/4 in. (6.35 mm).
NOZZLE
QTY...PART NO.
40RFA*07 4 Row 1...BBIZE— 5— GA 1...1135 12...
1
/
4
1...G4
40RFQ*07 3 Row 1...BBIZE— 5— GA 1...1136 15...
1
/
4
1...G5
40RFA*08 4 Row 1...BBIZE— 6— GA 1...1136 15...1/
4
1...G5
40RFQ*08 4 Row 1...BBIZE— 8— GA 1...1113 12...
3
/
16
1...G5
40RFA*12 4 Row 2...BBIZE— 4— GA 2...1135 9...
1
/
4
2...G3
40RFQ*12 4 Row 2...BBIZE— 5— GA 2...1113 9...
3/16
2...G3
4
3
2
1
5
A
UNIT
USE HOLE
NUMBERS
a
NOTE(S):
a. Access hole knockouts 1-4 are factory-supplied.
FIELD-FABRICATED HOLE
DIAMETERS
IN. (MM)
FIELD-FABRICATED HOLE
POSITION
DIMENSIONS, IN. (MM)
NO. 5 NO. 6 NO.7 A B C
40RFA*07, 08
40RFQ*07,08
1, 3 ——————
40RFA*12
40RFQ*12
1, 2, 3, 4 — — — — — —
40RFS*08, 10, 12 4, 5
1-3/4
(44.5)
——
6.25
(158.8)
——