Carrier ComfortLink 6 Series Controls, Start-Up, Operation, Service, And Troubleshooting page 87

The following tables show the loading sequence for
30HX206 (57/43 split) and 30HX271 (67/33 split) chillers. All
compressors have two loaders and the chiller is configured for
STANDARD LOADING SEQUENCE (CIRCUIT A LEAD CIRCUIT, 3-COMPRESSOR UNIT)
COMP LOADER
STAGE
A1 A1
0 0 0
1 1 0
2 1 1
3 1 1
4 1 1
5 1 1
6 1 1
7 1 1
CLOSE CONTROL LOADING SEQUENCE (CIRCUIT A LEAD CIRCUIT, 3-COMPRESSOR UNIT)
COMP LOADER
STAGE
A1 A1
0 0 0
1 1 0
2 1 1
3 1 1
3A 1 0
4 1 1
5 1 1
6 1 1
7 1 1
8 1 1
LEGEND
0 — Off
1 — On
NOTES:
1. Stage 3A is not used by the algorithm when increasing stages. Stage 3 is not used
by the algorithm when decreasing stages.
2. The % Total Capacities above are calculated based on compressor nominal tons.
For the case of the 57/43 split above, the 30HX uses compressors with flow rates
of 209, 123, and 250 cfm (from compressor model numbers 06N_209, 06N_123,
and 06N_250), which represent nominal tons of 66, 39, and 80 (respectively) at 60
Hz. A factor of 40% is used when no loaders are energized, and a factor of 70% is
used when Loader 1 is energized. The capacity shown for Stage 4 above is calcu-
lated as follows:
% Total Capacity=[(0.70 x 66 + 0.70 x 39 + 0.0 x 80)/(66 + 39 + 80)] x 100% =
39.7%
3. The loading sequence for 30GXN,R204-264 units is the same as those shown for
the 30HX206, 271 above.
APPENDIX B (cont)
LOADER COMP COMP
A2 A2 B1
0 0 0
0 0 0
0 0 0
1 0 0
0 1 0
1 1 0
1 1 1
1 1 1
LOADER COMP COMP
A2 A2 B1
0 0 0
0 0 0
0 0 0
1 0 0
0 1 0
0 1 0
1 1 0
1 1 1
1 1 1
1 1 1
87
staged circuit loading. Loaders A1 on compressors A1 and A2
are energized in parallel. The same is true for Loaders A2 on
both compressors A1 and A2. See Note 3.
LOADER LOADER
B1 B2
(57/43 Split)
0 0
0 0
0 0
0 0
0 0
0 0
1 0
1 1
LOADER LOADER
B1 B2
(57/43 Split)
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
1 0
1 1
% TOTAL % TOTAL
CAPACITY CAPACITY
(67/33 Split)
0.0 0.0
14.3 13.3
25.0 23.3
35.7 33.3
39.7 46.7
56.8 66.7
87.0 90.0
100.0 100.0
% TOTAL % TOTAL
CAPACITY CAPACITY
(67/33 Split)
0.0 0.0
14.3 13.3
25.0 23.3
35.7 33.3
22.7 26.7
39.7 46.7
56.8 66.7
74.1 80.0
87.0 90.0
100.0 100.0