Carrier 30RAP010-060 specifications START-UP and Operation, A30-4978

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.

a30-4978

OIL SIGHTGLASS

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.

Fig. 23 — Sight Glass Location

Table 28 — Minimum Cooler Flow Rates and Minimum Loop Volume

30RAP	MINIMUM COOLER FLOW	MAXIMUM COOLER FLOW	MINIMUM COOLER FLOW	MAXIMUM COOLER FLOW
SIZE	RATE (gpm)	RATE (gpm)	RATE (l/s)	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

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