Specifications
27
100% capacity; digital operation can be disabled by con-
figuring A1.TY = NO (Configuration
Unit
A1.TY).
5. Oil should be visible in the compressor sight glass(es).
See Fig. 20. An acceptable oil level in the compressors is
from
1
/
8
to
3
/
8
of sight glass when the compressors are off.
Adjust the oil level as required. See Oil Charge section on
page 30 for Carrier approved oils.
6. Crankcase heaters must be firmly attached to compres-
sors, and must be on for 24 hours prior to start-up
(30MPA units only).
7. Electrical power source must agree with unit nameplate.
8. Check rotation of scroll compressors. Monitor control
alarms during first compressor start-up for reverse rota-
tion protection alarm.
START-UP AND OPERATION
Compressor crankcase heaters must be on for 24 hours be-
fore start-up. To energize the crankcase heaters, close the field
disconnect. Leave the compressor circuit breakers off/open.
The crankcase heaters are now energized.
NOTE: Refer to Start-Up Checklist on pages CL-1 to CL-7.
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 (30MPA units only).
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 30MPW 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.
Schrader connection on the liquid line. Do NOT add refrigerant
charge through the low-pressure side of the system. If complete
charging is required, weigh in the appropriate charge for the
circuit as shown on the unit nameplate. If partial charging is re-
quired, operate circuit at full load and add charge until the sight
glass is clear of bubbles.
Table 18 — Minimum Flow Rates and Minimum Loop Volume — English
Table 19 — Minimum Flow Rates and Minimum Loop Volume — SI
LEGEND
CAUTION
Crankcase heaters on 30MPA units are wired into the con-
trol circuit, so they are always operable as long as the main
power supply disconnect is on (closed), even if any safety
device is open. Compressor heaters must be on for 24
hours prior to the start-up of any compressor. Equipment
damage could result if heaters are not energized for at least
24 hours prior to compressor start-up.
OIL SIGHTGLASS
Fig. 20 — Sight Glass Location
a30-4978
UNIT SIZE
FLOW RATE
NORMAL AIR CONDITIONING APPLICATION
Gal./Ton
PROCESS COOLING OR LOW AMBIENT
OPERATION APPLICATION
Gal./Ton
EVAPORATOR CONDENSER
Gal./Min Gal./Min Std Unit HGBP Digital Std Unit HGBP Digital
30MP015 22 22 12 N/A 3 12 N/A 6
30MP020 28 28 6 4 3 10 10 6
30MP030 43 43 6 4 3 10 10 6
30MP040 5555333666
30MP045
64
64333666
UNIT SIZE
FLOW RATE
NORMAL AIR CONDITIONING APPLICATION
L per kW
PROCESS COOLING OR LOW AMBIENT
OPERATION APPLICATION
L per kW
EVAPORATOR CONDENSER
L/s L/s Std Unit HGBP Digital Std Unit HGBP Digital
30MP015 1.4 1.4 13.0 N/A 3.3 13.0 N/A 6.5
30MP020 1.8 1.8 6.5 4.3 3.3 10.8 10.8 6.5
30MP030 2.7 2.7 6.5 4.3 3.3 10.8 10.8 6.5
30MP040 3.5 3.5 3.3 3.3 3.3 6.5 6.5 6.5
30MP045
4.0
4.0 3.3 3.3 3.3 6.5 6.5 6.5
HGBP — Hot Gas Bypass