Adjusting Speed Tap For Indoor; Blower Motor; Expansion Valve (Txv) System; Single Speed Application - Goodman GPH16 Installation Instructions Manual

ADJUSTING SPEED TAP FOR INDOOR BLOWER MOTOR
EEM Motor
The blower motor speed for the EEM 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 is medium speed cooling and T3 is medium speed heating. T4 is high speed cooling
and T5 is high speed heating. 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.
NOTE: GPC15 and GPH16 units are rated for a maximum
E.S.P. of 0.8 except when using a 20kw electric heater. (The
maximum static for 20 kW electric heat is 0.5 E.S.P.) When
these units are installed in the 0.5 - 0.8 E.S.P. range, the
white lead (electric heat) must be moved to T5 for proper
operation of the electric heaters.
See CFM vs ESP tables in this manual.
Refrigerant Charge Check (Units with Fixed Orifice Devices)
After completing airflow measurements and adjustments the
unit's refrigerant charge must be checked. All package units
with fixed orifice devices are charged using the super heat
method at the compressor suction line. After superheat is
adjusted it is recommended to check unit sub-cooling at the
condenser coil liquid line out. For charge adjustments, see
superheat and subcooling charts shown for each model.
SUPERHEAT CAN BE DETERMINED AS FOLLOWS:
1. Read suction pressure. Determine Saturated Suction
Temperature from tables or pressure gauge saturated
temperature scale (R-410A).
2. Read suction line temperature.
3. Use the following formula:
SUPERHEAT = SUCTION LINE TEMP - SAT. SUCTION TEMP.

EXPANSION VALVE (TXV) SYSTEM

SINGLE SPEED APPLICATION

(GPH1624-42)

1. Purge gauge lines. Connect service gauge manifold to
access fittings. Run system at least 10 minutes to allow
pressure to stabilize.
2. Temporarily install thermometer on liquid (small) line near
liquid line access fitting with adequate contact and insulate
for best possible reading.
3. Check subcooling and superheat. Systems with TXV
application should have a subcooling and superheat within
the range listed on the chart.
a. If subcooling and superheat are low, adjust TXV then
check subcooling.
b. If subcooling is low and superheat is high, add charge
to raise subcooling then check superheat.
c. If subcooling and superheat are high, adjust TXV valve then check subcooling.
d. If subcooling is high and superheat is low, adjust TXV valve superheat and remove charge to lower the subcooling.
The TXV should NOT be adjusted at light load conditions 55º to 60ºF, under such conditions only the subcooling can be
evaluated. This is because suction pressure is dependent on indoor air flow, and wet bulb temperature.
SATURATED
SUCTION PRESSURE
TEMPERATURE CHART
SATURATED
SUCTION SUCTION
PRESSURE TEMPERATURE
ºF
PSIG R-410A
50
52
54
56
58
60
62 10
64 11
66 13
68 14
70 15
72 16
74 17
76 19
78 20
80 21
85 24
90 26
95 29
100 31
110 36
120 41
130 45
140 49
150 53
160 56
170 60
Suction Pressure
Temperature (R-410A)
SUBCOOLING = SAT. LINE TEMP - LIQUID LINE TEMP.
11
SATURATED
LIQUID PRESSURE
TEMPERATURE CHART
SATURATED
LIQUID
PRESSURE TEMPERATURE
PSIG
1 200
3 210
4 220
6 225
7 235
8 245
255
265
275
285
295
305
325
355
375
405
415
425
435
445
475
500
525
550
575
600
625
TABLE 5
Liquid Pressure
Temperature (R-410A)
LIQUID
ºF
R-410A
70
73
76
78
80
83
85
88
90
92
95
97
101
108
112
118
119
121
123
125
130
134
138
142
145
149
152