Check Refrigerant Charge; Charge Adjustment For Brine Operation; Operating Limitations; Cooler Flow Rates And Loop Volumes - Carrier AQUASNAP 30RAP010-150 Start Up & Operation Manual


CSP.1) or (Set Points
used, with the control point (Run Status

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 —
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
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 use an accurate tempera-
ture sensor on the liquid line as it enters the EXV. Use the Tem-
peratures mode on the scrolling marquee display to show the
circuit saturated condensing
 
tures CIR.A SCT.A)
SCT.B). Charging is most accurate at saturated discharge tem-
peratures of 120 to 125 F (49 to 52 C). Block condenser airflow
as required to reach this temperature range. Add refrigerant un-
til 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 / -in. suction Schrader connection on the suction
4
line.
070
Leaving Brine
Ckt A Ckt B
Temperature
44F-35F
34F-15F 0.8 1.1
30RAP MINIMUM COOLER FLOW
SIZE RATE (gpm)
010
015
018
020
025
030
035
040
045
050
055
060
070
080
090
100
115
130
150
 
COOL CSP.2), or if reset is

VIEW
All 30RAP units are
1
temperature (Tempera-

or

(Temperatures

CIR.B
Table 18 — Charge Adjustment for Brine Operation
Charge to be Removed from Brine Operation (lb)
080 090
CktA Ckt B Ckt A
1.1 1.1 1.1
Table 19 — Minimum Cooler Flow Rates
MAXIMUM COOLER FLOW
RATE (gpm)
13
17
20
23
28
33
41
47
53
57
63
68
86
98
107
123
140
158
175
Charge Adjustment for Brine Operation —
For 30RAP010-060 units, the 30RAP chiller does not require a
medium temperature brine modification at any temperature
within the chiller application range which is as low as 14 F
(–10 C) leaving fluid temperature.
For 30RAP070-150 units, see Table 18 for proper change
adjustment.
Never charge liquid into low-pressure side of system. Do
not overcharge. Overcharging results in higher discharge
pressure, possible compressor damage, and higher power
consumption. During charging or removal of refrigerant, be
/ -in.
4
sure water is continuously circulating through the cooler to
prevent freezing.

Operating Limitations

COOLER FLOW RATES AND LOOP VOLUMES —
Refer to Table 19 for minimum and maximum cooler flow
rates. Refer to Table 20 for minimum fluid volume require-
ments.

TEMPERATURES (See Table 21 for 30RAP standard tem-
perature limits).
Do not operate with cooler leaving chiller water (fluid)
temperature (LCWT) below 40 F (4.4 C) for the standard
units, or below 15 F (–9.4 C) for units factory built for
medium temperature brine.
100
Ckt B Ckt A Ckt B Ckt A
No Change is Needed
1.1 1.1 2.0
MINIMUM COOLER FLOW
50
66
78
91
112
133
164
186
209
228
251
270
310
355
387
444
503
569
629
44
CAUTION
CAUTION
115 130
Ckt B Ckt A Ckt B
2.0 2.0 2.0 3.0
MAXIMUM COOLER FLOW
RATE (l/s)
0.8
1.1
1.3
1.5
1.8
2.1
2.6
3.0
3.3
3.6
4.0
4.3
5.4
6.2
6.8
7.8
8.8
10.0
11.0
150
Ckt A Ckt B
3.0 3.0
RATE (l/s)
3.2
4.2
4.9
5.7
7.1
8.4
10.3
11.7
13.2
14.4
15.8
17.0
19.6
22.4
24.4
28.0
31.7
35.8
39.6