83
APPENDIX B (cont)
The following tables show the loading sequence for 30HX206
(57/43 split) and 30HX271 (67/33 split) chillers. All compres-
sors have two loaders and the chiller is configured for staged
circuit loading. Loaders A1 on compressors A1 and A2 are en-
ergized in parallel. The same is true for Loaders A2 on both
compressors A1 and A2. See Note 3.
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 60Hz. 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 calculated 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 fo 30GX205-265 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 00 0000 0 0.0 0.0
110 0000 0 14.3 13.3
211 0000 0 25.0 23.3
311 1000 0 35.7 33.3
411 0100 0 39.7 46.7
511 1100 0 56.8 66.7
611 1111 0 87.0 90.0
711 1111 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 00 0000 0 0.0 0.0
110 0000 0 14.3 13.3
211 0000 0 25.0 23.3
311 1000 0 35.7 33.3
3A 10 0100 0 22.7 26.7
411 0100 0 39.7 46.7
511 1100 0 56.8 66.7
611 1110 0 74.1 80.0
711 1111 0 87.0 90.0
811 1111 1 100.0 100.0
LEGEND
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