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87
APPENDIX B (cont)
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
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.
LEGEND
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.
STANDARD LOADING SEQUENCE (CIRCUIT A LEAD CIRCUIT, 3-COMPRESSOR UNIT)
STAGE
COMP
A1
LOADER
A1
LOADER
A2
COMP
A2
COMP
B1
LOADER
B1
LOADER
B2
% TOTAL
CAPACITY
(57/43 Split)
% TOTAL
CAPACITY
(67/33 Split)
0
0
0
0
0
0
0
0
0.0
0.0
1
1
0
0
0
0
0
0
14.3
13.3
2
1
1
0
0
0
0
0
25.0
23.3
3
1
1
1
0
0
0
0
35.7
33.3
4
1
1
0
1
0
0
0
39.7
46.7
5
1
1
1
1
0
0
0
56.8
66.7
6
1
1
1
1
1
1
0
87.0
90.0
7
1
1
1
1
1
1
1
100.0
100.0
CLOSE CONTROL LOADING SEQUENCE (CIRCUIT A LEAD CIRCUIT, 3-COMPRESSOR UNIT)
STAGE
COMP
A1
LOADER
A1
LOADER
A2
COMP
A2
COMP
B1
LOADER
B1
LOADER
B2
% TOTAL
CAPACITY
(57/43 Split)
% TOTAL
CAPACITY
(67/33 Split)
0
0
0
0
0
0
0
0
0.0
0.0
1
1
0
0
0
0
0
0
14.3
13.3
2
1
1
0
0
0
0
0
25.0
23.3
3
1
1
1
0
0
0
0
35.7
33.3
3A
1
0
0
1
0
0
0
22.7
26.7
4
1
1
0
1
0
0
0
39.7
46.7
5
1
1
1
1
0
0
0
56.8
66.7
6
1
1
1
1
1
0
0
74.1
80.0
7
1
1
1
1
1
1
0
87.0
90.0
8
1
1
1
1
1
1
1
100.0
100.0
0
— Off
1
— On