Pressure Service Ports - Bard MEGA-TEC W120AP Service Instructions Manual

Pressure Service Ports

High and low pressure service ports are installed on all
wall-mount units so that the system operating pressures
can be observed. Pressures are shown in Table 8.
This unit employs high-flow Coremax valves instead of
the typical Schrader type valves.
Model Return Air Temp
75° DB
62° WB
80° DB
W120AP
Stage 3
67° WB
85° DB
72° WB
75° DB
62° WB
80° DB
W120AP
Stage 2
67° WB
85° DB
72° WB
75° DB
62° WB
80° DB
W120AP
Stage 1
67° WB
85° DB
72° WB
Low side pressure ± 4 PSIG
High side pressure ± 10 PSIG
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 22.
TABLE 7
Cooling Pressures
Cooling Air Temperature Entering Outdoor Coil °F
Pressure 75 80
Low Side 125 126 127 128 129 130 132 133 135 137 137
High Side 312 334 357 379 403 427 451 476 501 527 553
Low Side 134 135 136 137 138 139 141 142 144 146 147
High Side 320 343 366 389 413 438 463 488 514 540 567
Low Side 139 140 141 142 143 144 146 147 149 151 152
High Side 331 355 379 403 427 453 479 505 532 559 587
Low Side 136 137 137 138 140 141 142 144 145 147 148
High Side 289 308 330 352 374 398 423 448 474 501 528
Low Side 145 146 147 148 150 151 152 154 155 157 158
High Side 296 316 338 361 384 408 434 459 486 514 542
Low Side 150 151 152 153 155 156 157 159 160 162 164
High Side 306 327 350 374 397 422 449 475 503 532 561
Low Side 125 127 128 130 131 133 135 136 137 139 141
High Side 311 332 355 377 402 427 452 479 506 534 563
Low Side 134 136 137 139 140 142 144 145 147 149 151
High Side 319 341 364 387 412 438 464 491 519 548 577
Low Side 139 141 142 144 145 147 149 150 152 154 156
High Side 330 353 377 401 426 453 480 508 537 567 597
WARNING! Do NOT use a Schrader valve core removal
tool with these valves. Use of such a tool could result
in eye injuries or refrigerant burns!
To change a Coremax valve without first removing the
refrigerant, a special tool is required which can be
obtained at www.fastestinc.com/en/SCCA07H. See the
replacement parts manual for replacement core part
numbers.
85 90 95 100 105 110 115 120 125
Manual 2100-671
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