Air Flow Measurement And Adjustment - Goodman GPC 13 SEER H Series Installation Instructions Manual

calls for heat. At the end of the timing period, the unit's
defrost cycle will be initiated provided the sensor remains
closed. When the sensor opens (approximately 75° F), the
defrost cycle is terminated and the timing period is reset. If
the defrost cycle is not terminated due to the sensor
temperature, a ten minute override interrupts the unit's
defrost period.
TEST
JUMPER WIRE
A
90
60
30
C Y
SUGGESTED FIELD TESTING/TROUBLE SHOOTING
1. Run unit in the heating mode (room thermostat calling for
heat).
2. Check unit for proper charge. Note: Bands of frost on the
condenser coil indicate low refrigerant charge.
3. Shut off power to unit.
4. Disconnect outdoor fan by removing the purple lead from
"DF2" on defrost control.
5. Restart unit and allow frost to accumulate.
6. After a few minutes of operation, the unit's defrost
thermostat should close. To verify this, check for 24 volts
between "DFT" and "C" on board. If the temperature at the
thermostat is less than 28° F and the thermostat is open,
replace the unit's defrost thermostat, as it is defective.
Model Speed
LOW
MED
HIGH
"T" 1 LOW
"T" 2 MED
"T" 3 HIGH
Notes:
• Data shown is dry coil. Wet coil pressure drop is approximately 0.1" H2O, for two-row indoor coil; 0.2" H2O, for three-row indoor coil; and 0.3" H2O, for four-row indoor coil.
• Data shown does not include filter pressure drop, approx. 0.08" H
• ALL MODELS SHOULD RUN NO LESS THAN 350 CFM/TON.
• Reduce airflow by 2% for 208-volt operation.
W2 R R DFT
FIGURE 7
Volts
CFM
230
WATTS
CFM
230
WATTS
CFM
230
WATTS
CFM
230
WATTS
CFM
230
WATTS
CFM
230
WATTS
O.
2
7. When the unit's defrost thermostat has closed, short the
test pins on the defrost board until the reversing valve shifts,
indicating defrost. This should take up to 21 seconds
depending on what timing period the control is set on. After
defrost initiation, the short must instantly be removed or the
unit's defrost period will only last 2.3 seconds.
8. After the unit's defrost thermostat has terminated, check
the defrost thermostat for 24 volts between "DFT" and "C".
DF2
The reading should indicate 0 volts (open sensor).
9. Shut off power to unit.
10. Replace outdoor fan motor lead to terminal "DF2" on defrost
DF1
board and turn on power.

AIR FLOW MEASUREMENT AND ADJUSTMENT

After reviewing section on DUCTING, proceed with airflow
measurements and adjustments. Unit's blower curves (in
Specification Sheets) are based on external static pressure
(ESP, in. of W.C.). The duct openings on the unit are
considered internal static pressure, so as long as ESP is
maintained, the unit will deliver the proper air up to the
maximum static pressure listed for the CFM required by the
application (i.e. home, building, etc.)
In general 400 CFM per ton of cooling capacity is a rule of
thumb. Some applications depending on the sensible and
latent capacity requirements may need only 350 CFM or up
to 425 CFM per ton.
requirements (from load calculations) and equipment
expanded ratings data to match CFM and capacity.
E.S.P (In. of H
0.1 0.2 0.3
1,180 1,125 1,075
335 325 315
1,350 1,280 1,205
435 420 405
1,450 1,370 1,290
495 480 465
1,860 1,800 1,745
410 425 440
1,990 1,945 1,885
510 520 530
2,100 2,045 1,985
595 610 620
10
Check condition space load
O)
2
0.4 0.5 0.6
1,020 955 875
305 295 275
1,130 1,050 985
385 375 350
1,205 1,130 1,040
440 425 400
1,695 1,650 1,600
455 470 480
1,835 1,785 1,740
545 555 570
1,945 1,895 1,850
630 645 660
0.7 0.8
655 -
240 -
910 845
330 310
960 885
385 370
1,555 1,500
495 500
1,695 1,645
585 590
1,800 1,750
670 680