Step 3 - Piping Connections; Duplex Unit Piping Connections; Cooler Fluid, Vent, And Drain - Carrier R080-528 Installation Instructions Manual

NO. OF
30GXN,R COOLER
PASSES
283 STD 1
303 STD 1
328 STD 1
353 STD 1
370 STD 1
373 STD 1
390 STD 1
393 STD 1
415 STD 1
418 STD 1
450 STD 1
453 STD 1
475 STD 1
478 STD 1
500 STD 1
503 STD 1
525 STD 1
528 STD 1
Step 3 — Piping Connections —
piping applications.
Remove chilled water flow switch, entering and leaving
water thermistors before welding connecting piping. Rein-
stall flow switch and thermistors after welding is complete.
Failure to remove these devices may cause unit damage.
GENERAL — The factory-installed victaulic connections al-
low clamp-on connection of water lines to the coolers in all
30GXN,R units. See Tables 4 and 5 for proper piping align-
ment with the victaulic flanges. Each unit is shipped with
2 flange assemblies (Fig. 29) with integral nozzles, 2 gaskets
(located in control box) and one flow sensor. See Fig. 30. The
flow sensor is factory-installed in the side of the entering fluid
nozzle.
DUPLEX UNIT PIPING CONNECTIONS — The 30GXN,R
duplex units require a field piping connection between the two
modules. All duplex 30GXN,R chillers have standard 8 in.
(219.1 mm) diameter pipe connections. Victaulic style grooved
pipe fittings are recommended for the interconnecting piping to
ensure no weld slag enters the cooler. A flexible coupling
(Braided Stainless Flex Hose SVG8 or Butyl Rubber Unaflex
Style 1000 or similar) is required between the two modules.
See Fig. 11-25. Tables 4 and 5 provide alignment criteria for
the Victaulic and Flex-Hose couplings. Piping details for use
with the Duplex Trim Kit are shown on the Typical Duplex
Connection Piping diagram in Fig. 32B and 33.
COOLER FLUID, VENT, AND DRAIN — The inlet (re-
turn) fluid connection is always the lower of the 2 cooler con-
nections. See Fig. 1-25 for locations. A screen strainer with a
minimum size of 20 mesh must be installed ahead of the cooler
inlet to prevent debris from damaging internal tubes of the
cooler. Outlet (supply) fluid connection is the upper connection
of the 2 cooler connections.
The cooler has victaulic connections to connect the field-
supplied piping. Plan the piping arrangement in accordance
Table 3B — Duplex Unit Operating Range
MAX. COOLER TEMPERATURE
DIFFERENCE
F C
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
20 11.1
See Fig. 29-35 for
44
REFERENCE
MIN FLOW RATE
Gpm
329
347
382
420
502
444
588
461
588
475
502
512
542
546
571
579
601
607
with good piping practices and so that the piping does not cross
in front of the cooler head. Use flexible connections on cooler
piping to reduce vibration transmission. Offset the piping to
permit removal of the cooler head for maintenance. Install
pipe hangers where needed. Make sure no weight or stress is
placed on the water nozzle.
Standard piping alignment criteria is shown in Tables 4
and 5.
IMPORTANT: Installation of a cooler pump interlock is
recommended to aid in preventing potential system dam-
age due to loss of fluid flow. Install on TB5-1 to TB5-2 and
connect pump interlock. See Field Control Power Connec-
tions section.
Provide openings in fluid piping for pressure gages and
thermometers (if used). These openings should be 5 to 10 pipe
diameters from the unit leaving water nozzle. For thorough
mixing and temperature stabilization, wells in the leaving fluid
pipe should extend at least 2 in. (50 mm) into the pipe.
Although cooler has an air vent, it is recommended that a
field-supplied air vent be installed in the system to facilitate
servicing. Field-supplied shut-off and balancing valves should
also be installed to facilitate servicing and flow balancing. Lo-
cate valves in return and supply fluid lines as close to the chill-
er as possible. Locate air vent at highest point of the cooler
fluid system. See Fig. 32A and 32B.
Provide drain connections at all low points to permit com-
plete drainage of the system.
A thermal flow sensor is factory installed in the entering
fluid nozzle. The sensor is factory wired. If a cooler pump in-
terlock is used, connect the interlock to terminals TB5-1, 2.
The factory-installed flow sensor and cooler interlock must be
wired in series.
Table 4 — Victaulic Connection Alignment
PIPE SIZE NOM. in. PIPE END SEPARATION
(ACTUAL mm) in. (mm)
8 (219.1) 0-0.13 (0-3.2)
NOMINAL
FLOW RATE
L/s Gpm L/s
20.8 658 41.5
21.9 694 43.8
24.1 764 48.2
26.5 839 53.0
31.7 879 55.5
28.0 889 56.1
37.1 909 57.3
29.1 921 58.1
37.1 974 61.4
30.0 950 59.9
31.7 1031 65.0
32.3 1025 64.7
34.2 1085 68.4
34.4 1091 68.8
36.0 1141 72.0
36.5 1158 73.0
37.9 1202 75.8
38.3 1214 76.6
PIPE ALIGNMENT
in./Ft (mm/m)
0.27 (21)