12
NOTES:
■
Data shown is dry coil. Wet coil pressure drop is
approximately 0.1" H
2
0 for 2-row indoor coil, 0.2" H
2
0 for
3-row indoor coil; and 0.3" H
2
0 for 4-row indoor coil.
■
Data shown does not include filter pressure drop,
approximately 0.08" H
2
O.
■
All models should run no less than 350 CFM/Ton.
■
Reduce airflow by 2% for 208-volt operation.
Refrigerant Charge Checks
After completing airflow measurements and adjustments, the
unit’s refrigerant charge must be checked. The unit is factory
charged based on 400 CFM per ton at minimum ESP per AHRI
test conditions (generally between 0.15 and 0.25 ESP). When air
quantity or ESP differs from this, charge must be readjusted to
the proper amount.
All package units are charged to the superheat method at the
compressor suction line (these are fixed orifice devices).
For charging in the warmer months, 8ºF +/-3ºF superheat at the
compressor is required at conditions: 95ºF (35ºC) outdoor
ambient (dry bulb temperature), 80ºF (27ºC) dry bulb / 67ºF
(19ºC) wet bulb indoor ambient, approximately 50% humidity.
This superheat varies when conditions vary from the conditions
described.
A superheat charge chart is available for other operating
conditions. Use it to provide the correct superheat at the
conditions the unit is being charged at. After superheat is
adjusted it is recommended to check unit subcooling at the
condenser coil liquid line out. In most operating conditions 10ºF
to 15ºF of subcooling is adequate.
Determine Superheat
1. Read suction pressure.
2. Determine Saturated Suction Temperature from tables or
pressure gauge saturated temperature scale (R-410A).
3. Read suction line temperature.
4. Use the following formula to determine Superheat.
WPH4336AM
Low
CFM
1,122
1,078
1,032
972
915
804
687
558
Watts
338
330
321
310
300
283
264
250
Med
CFM
1,387
1,331
1,264
1,209
1,119
1,041
935
748
Watts
456
440
428
412
399
382
363
330
High
CFM
1,521
1,454
1,388
1,311
1,230
1,144
1,055
939
Watts
534
521
510
490
477
461
442
420
HIGH
CFM
1,565
1,510
1,415
1,340
1,260
1,135
1,035
885
Watts
495
480
460
445
425
405
385
355
WPH4342AM
Low
CFM
1,122
1,078
1,032
972
915
804
687
558
Watts
338
330
321
310
300
283
264
250
Med
CFM
,387
1,331
1,264
1,209
1,119
1,041
935
748
Watts
456
440
428
412
399
382
363
330
High
CFM
1,521
1,454
1,388
1,311
1,230
1,144
1,055
939
Watts
534
521
510
490
477
461
442
420
WPH4348AM
T1(G)
CFM
1,140
1,395
1,360
1,310
1,265
1,235
1,190
1,130
Watts
275
285
295
315
325
335
345
355
T2/T3 (W2)
CFM
1,795
1,765
1,715
1,695
1,650
1,600
1,500
1,375
Watts
475
490
505
520
530
535
510
475
T4/T5 (Y)
CFM
1,860
1,820
1,785
1,745
1,700
1,625
1,515
1,395
Watts
515
530
545
565
570
550
535
485
WPH4360AM
T1 (G)
CFM
1,755
1,720
1,685
1,645
1,615
1,570
1,530
1,465
Watts
420
435
455
460
475
490
500
500
T2/T3 (W2)
CFM
1,850
1,820
1,775
1,735
1,705
1,675
1,610
1,495
Watts
480
500
515
525
535
555
545
520
T4/T5 (Y)
CFM
2,180
2,125
2,050
1,975
1,875
1,800
1,655
1,530
Watts
770
755
725
700
675
640
575
540
E.S.P. (In. of H
2
O)
Model
Speed
Volts—230
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
