Adjusting Speed Tap For Indoor Blower Motor; Checking Charge - Goodman GPC SERIES Installation & Operating Instructions Manual

ADJUSTING SPEED TAP FOR INDOOR BLOWER
MOTOR
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.
See Specification Sheet for GPC/GPH model series for
CFM vs ESP tables.

CHECKING CHARGE

After completing airflow measurements and adjustments,
the unit's refrigerant charge must be checked. The unit
comes factory charged, but this charge is based on 400
CFM per ton at minimum ESP per ARI 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 are 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
adequate.
º
F superheat at the
º F outdoor ambient
º F dry bulb / 67 º F wet bulb indoor
º F of sub-cooling is
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
Operating Pressures
Ambient Condenser
Inlet Temp (°F
Drybulb)
100
95
90
85
80
75
70
65
60
System Superheat
10
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
TABLE 6
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
TABLE 7
85
10
10
18
20
26
29
32
35
37