10
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
º
F superheat at the
compressor is required at conditions: 95
º
F outdoor ambient
(dry bulb temperature), 80
º
F dry bulb / 67
º
F 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 sub-cooling at the condenser coil liquid line out. In
most operating conditions 10 - 15
º
F of sub-cooling is
adequate.
Suction Pressure
Saturated Suction
Temperature (°F)
50
26
53
28
55
30
58
32
61
34
63
36
66
38
69
40
72
42
75
44
78
46
81
48
84
50
87
52
TABLE 5
Suction Pressure Temperature (R-22)
DB
WB
63
301 - 332
73 - 83
115
75
67
306 - 335
77 - 78
71
311 - 342
82 - 92
63
268 - 299
72 - 82
105
75
67
273 - 304
77 - 87
71
278 - 309
80 - 90
63
233 - 264
67 - 77
95
75
67
238 - 269
72 - 82
71
243 - 274
77 - 87
63
198 - 229
62 - 72
85
75
67
203 - 234
67 - 77
71
208 - 239
71 - 81
63
172 - 203
57 - 67
75
75
67
175 - 206
61 - 71
71
180 - 211
66 - 76
63
144 - 175
52 - 62
65
75
67
149 - 180
56 - 66
71
155 - 186
60 - 70
INDOOR
TEMP. °F
LIQUID
PRESSURE
PSIG
SUCTION
PRESSURE
PSIG
OUTDOOR
TEMP. °F
TABLE 6
Operating Pressures
65
70
75
80
85
100
-
-
-
10
10
95
-
-
10
10
10
90
-
-
12
15
18
85
-
10
13
17
20
80
-
10
15
21
26
75
10
13
17
25
29
70
10
17
20
28
32
65
13
19
26
32
35
60
17
25
30
33
37
Ambient Condenser
Inlet Temp (°F
Drybulb)
Return Air Temp. (°F Drybulb)
TABLE 7
System Superheat
