Adjusting Speed Tap For Indoor Blower Motor; Checking Charge - Goodman GPC 13 SEER H Series Installation Instructions Manual

After unit is set and ducted, verify ESP with a 1" inclined
manometer with pitot tubes or a Magnahelic gauge and
confirm CFM to blower curves in the specification sheets.
All units have three speed blower motors. If low speed is not
utilized, the speed tap can be changed to medium or high
speed. Never run CFM below 350 CFM per ton, evaporator
freezing or poor unit performance is possible.
ADJUSTING SPEED TAP FOR INDOOR BLOWER
PSC Motor
Adjust the CFM for the unit by changing the speed tap of
the indoor blower motor at the EBTDR "com" connection
with one of the speed taps on "M1" or "M2". (Black-High
Speed, Blue-Medium Speed, Red-Low Speed.)
X-13 Motor
The blower motor speed for the X-13 motor is controlled by
three 24V low voltage leads: green, yellow, and white. The
green lead sets the speed for fan-only mode. The yellow
lead sets the speed for cooling and heat pump heating
mode (if applicable). The white lead sets the speed for
electric heat mode (emergency heat and second stage
heat, if applicable).
The leads are factory connected as follows: Green to T1,
Yellow to T2, and White to T3. T1 is the low speed setting
and is dedicated to fan-only mode. T2 and T3 are medium
speed settings. T4 and T5 are high speed settings. To
adjust the blower speed, move the yellow and/or white wires
to T4 and T5. NOTE: If more than one lead is energized at
the same time, the motor will use the higher speed setting.

CHECKING CHARGE

After completing airflow measurements and adjustments, the
unit's refrigerant charge must be checked. The design charge
(per table on page 7) is based on 400 CFM per ton at minimum
ESP per AHRI test conditions (generally between .15 - .25
ESP). When air quantity or ESP is different than above,
charge must be adjusted to the proper amount. All package
units should be charged to the superheat method at the
compressor suction line (these are fixed orifice devices).
For charging in the warmer months, 10
compressor is required at conditions: 95
(dry bulb temperature), 80
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
sub-cooling at the condenser coil liquid line out. In most
operating conditions 10 - 15
MOTOR
º F superheat at the
º
F outdoor ambient
º º
F dry bulb / 67 F wet bulb indoor
º
F of sub-cooling is adequate.
Suction Pressure
50
53
55
58
61
63
66
69
72
75
78
81
84
87
Suction Pressure Temperature (R-22)
INDOOR
OUTDOOR
TEMP. °F
TEMP. °F
DB
115 75
105 75
95 75
85 75
75 75
65 75
TABLE 6 - Operating Pressures
Ambient Condenser
Inlet Temp (°F
Drybulb)
100
95
90
85
80
75
70
65
60
TABLE 7 - System Superheat
SUPERHEAT CAN BE DETERMINED AS FOLLOWS:
1. Read suction pressure. Determine Saturated Suction
Temperature from tables or pressure gauge saturated
temperature scale (R-22).
2. Read suction line temperature.
3. Use the following formula:
SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP
11
Saturated Suction
Temperature (°F)
26
28
30
32
34
36
38
40
42
44
46
48
50
52
TABLE 5
LIQUID SUCTION
PRESSURE PRESSURE
PSIG PSIG
WB
63 301 - 332 73 - 83
67 306 - 335 77 - 78
71 311 - 342 82 - 92
63 268 - 299 72 - 82
67 273 - 304 77 - 87
71 278 - 309 80 - 90
63 233 - 264 67 - 77
67 238 - 269 72 - 82
71 243 - 274 77 - 87
63 198 - 229 62 - 72
67 203 - 234 67 - 77
71 208 - 239 71 - 81
63 172 - 203 57 - 67
67 175 - 206 61 - 71
71 180 - 211 66 - 76
63 144 - 175 52 - 62
67 149 - 180 56 - 66
71 155 - 186 60 - 70
Return Air Temp. (°F Drybulb)
65 70 75 80
- - - 10
- - 10 10
- - 12 15
- 10 13 17
- 10 15 21
10 13 17 25
10 17 20 28
13 19 26 32
17 25 30 33
85
10
10
18
20
26
29
32
35
37