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2. Use the scrolling marquee display to adjust the Cooling
Set Point.
3. Fill chilled fluid circuit with clean water (with recom-
mended inhibitor added) or other non-corrosive fluid to
be cooled. Bleed all air out of the high points of the sys-
tem. If chilled water is to be maintained at a temperature
below 40 F (4.4 C) or outdoor temperatures are expected
to be below 32 F (0° C), a brine of sufficient concentra-
tion must be used to prevent freeze-up at anticipated
suction temperatures. See Table 28.
4. Check tightness of all electrical connections.
5. Oil should be visible in the compressor sightglass(es).
See Fig. 23. An acceptable oil level in the compressors is
from
1
/
8
to
3
/
8
of sight glass. Adjust the oil level as re-
quired. See Oil Charge section on page 50 for Carrier ap-
proved oils.
6. Electrical power source must agree with unit nameplate.
7. All condenser fan and factory installed hydronic package
pump motors are three phase. Check for proper rotation
of condenser fans first BEFORE attempting to start
pumps or compressors. To reverse rotation, interchange
any two of the main incoming power leads.
8. Be sure system is fully charged with refrigerant (see
Check Refrigerant Charge section on this page).
9. If unit is a brine unit, check to ensure proper brine con-
centration is used to prevent freezing.
10. Verify proper operation of cooler and hydronic package
heaters (if installed). Heaters operate at the same voltage
as the main incoming power supply and are single phase.
Heater current is approximately 0.4 amps for 460 and
575 v units. Heater current is approximately 0.8 amps for
230 v units.
START-UP AND OPERATION
NOTE: Refer to Start-Up Checklist on pages CL-1 to CL-10.
Actual Start-Up — Actual start-up should be done only
under supervision of a qualified refrigeration mechanic.
1. Be sure all service valves are open.
2. Using the scrolling marquee display, set leaving-fluid set
point (Set Points
COOL
CSP.1). No cooling range
adjustment is necessary.
3. Start chilled fluid pump (if not configured for cooler
pump control).
4. Turn ENABLE/OFF/REMOTE CONTACT switch to
ENABLE position.
5. Allow unit to operate and confirm that everything is func-
tioning properly. Check to see that leaving fluid tempera-
ture agrees with leaving set point (Set Points
COOL
CSP.1) or (Set Points
COOL
CSP.2), or if reset is
used, with the control point (Run Status
VIEW
CTPT).
6. Check the cooler leaving chilled water temperature to see
that it remains well above 32 F (0° C), or the brine freez-
ing point if the unit is a medium temperature brine unit.
7. Recheck compressor oil level (see Oil Charge section).
Check Refrigerant Charge — All 30RAP units are
shipped with a complete operating charge of R-410A and
should be under sufficient pressure to conduct a leak test after
installation. If there is no system pressure, admit nitrogen until
a pressure is observed and then proceed to test for leaks. After
leaks are repaired, the system must be dehydrated.
All refrigerant charging should be done through the ¼-in.
Schraeder connection on the liquid line. Do NOT add refriger-
ant charge through the low-pressure side of the system. If com-
plete charging is required, weigh in the appropriate charge for
the circuit as shown on the unit nameplate. If partial charging is
required, operate circuit at full load and use an accurate tem-
perature sensor on the liquid line as it enters the EXV. Use the
Temperatures mode on the scrolling marquee display to show
the circuit saturated condensing temperature (Tempera-
tures
CIR.A
SCT.A) or (Temperatures
CIR.B
SCT.B). Charging is most accurate at saturated discharge
temperatures of 120 to 125 F (49 to 52 C). Block condenser air-
flow as required to reach this temperature range. Add refriger-
ant until the system subcooling (SCT.A or SCT.B minus liquid
line temperature entering EXV) is approximately 15 to 17 F
(–9.4 to –8.3 C). Refrigerant VAPOR only may be added to a
circuit through the
1
/
4
-in. suction Schraeder connection on the
suction line.
Table 28 — Minimum Cooler Flow Rates and Minimum Loop Volume
OIL SIGHTGLASS
Fig. 23 — Sight Glass Location
a30-4978
30RAP
SIZE
MINIMUM COOLER FLOW
RATE (gpm)
MAXIMUM COOLER FLOW
RATE (gpm)
MINIMUM COOLER FLOW
RATE (l/s)
MAXIMUM COOLER FLOW
RATE (l/s)
010 13 50 0.8 3.2
015 17 66 1.1 4.2
018 20 78 1.3 4.9
020 23 91 1.5 5.7
025 28 112 1.8 7.1
030 33 133 2.1 8.4
035 41 164 2.6 10.3
040 47 186 3.0 11.7
045 53 209 3.3 13.2
050 57 228 3.6 14.4
055 63 251 4.0 15.8
060 68 270 4.3 17.0