Bard MEGA-TEC W090A, Service Instructions Manual

Page: 43 / 159

Manual 2100-671C
Page 41 of 59
TABLE 14
W150A* Cooling Pressures
Low side pressure ± 4 PSIG
High side pressure ± 10 PSIG
1
Stage 3 is circuit 1 fully loaded and circuit 2 on .
2
Stage 2 is circuit 1 unloaded and circuit 2 on .
3
Stage 1 is circuit 1 unloaded and circuit 2 off .
Tables are based upon rated CFM (airflow) across the evaporator coil. If there is any doubt as to correct operating charge
being in the system, the charge should be removed and system evacuated and recharged to serial plate charge weight.
NOTE: Pressure table based on high speed condenser fan operation. If condensing pressures appear elevated, check
condenser fan wiring. See “Condenser Fan Operation” on page 23.
Cooling Air Temperature Entering Outdoor Coil °F
Model Return Air Temp Pressure 75 80 85 90 95 100 105 110 115 120 125
W150A*
Stage 3
1
75° DB Low Side 124 124 125 126 126 127 128 129 131 132 133
62° WB High Side 442 430 423 423 428 439 456 478 507 541 581
80° DB Low Side 133 133 134 134 135 136 137 138 140 141 143
67° WB High Side 453 441 434 433 439 450 467 491 520 555 596
85° DB Low Side 137 138 138 139 140 141 142 143 145 146 148
72° WB High Side 469 456 449 449 454 466 484 508 538 574 617
W150A*
Stage 2
2
75° DB Low Side 136 136 137 138 139 140 141 142 144 145 147
62° WB High Side 363 361 364 370 381 395 414 436 463 493 528
80° DB Low Side 145 146 147 148 149 150 151 152 154 155 157
67° WB High Side 372 371 373 380 390 405 424 447 474 506 541
85° DB Low Side 150 151 152 153 154 155 156 158 159 161 162
72° WB High Side 385 384 386 393 404 419 439 463 491 524 560
W150A*
Stage 1
3
75° DB Low Side 124 125 125 126 127 127 128 128 129 129 129
62° WB High Side 420 413 410 410 414 422 433 448 467 489 515
80° DB Low Side 132 133 134 135 136 136 137 137 138 138 138
67° WB High Side 431 424 420 421 425 433 445 460 479 502 528
85° DB Low Side 137 138 139 140 140 141 142 142 142 143 143
72° WB High Side 446 438 435 436 440 448 460 476 496 519 547