Installation guide

REFRIGERANT CHARGE
A. COOLING MODE
Outdoor units are shipped with a refrigerant charge to
match a specific indoor coil and 15 feet of refrigerant line.
If shorter or longer refrigerant lines or a different indoor
coil are used, the charge will have to be adjusted.
For different line lengths, add or remove charge based on
0.6 ounces charge per foot of difference. For example, a
25 foot line set is 10 feet longer than the specified 15 feet.
Add 0.6 ounces charge for each of the extra 10 feet:
10 x 0.6 = 6.0 ounces additional charge
This outdoor unit is designed for use only with indoor coils
that utilize a hard shut-off TXV refrigerant metering de-
vice. With a hard shut-off indoor TXV, use the subcooling
method to make final charge adjustments:
1. Operate unit a minimum of 10 minutes before
checking charge.
NOTE: If outdoor unit has a 2-speed fan motor,
motor will operate in low speed when outdoor am-
bient temperature is below 82 °F. Pull one of the
yellow low voltage wires off the fan control and the
unit will default to high speed fan for servicing. Re-
connect wire after servicing.
2. Measure liquid service valve pressure by attaching
an accurate gauge to service port.
3. Measure liquid line temperature by attaching an
accurate thermistor type sensor or electronic ther-
mometer to liquid line near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Figure 15. Find the required liquid line
temperature where the rating plate subcooling
temperature intersects measured liquid service
valve pressure.
6. If the measured liquid line temperature is higher
than the chart number, add refrigerant to lower the
measured temperature.
NOTE: When adding refrigerant, charge in liquid
form, using a flow restricting device, into the suc-
tion port.
If the measured liquid line temperature is lower
than the chart number, reclaim refrigerant to raise
the measured temperature.
Tolerance is + 3 °F.
B. HEATING MODE
To check system operation during heating cycle, refer to
the Tech Label on outdoor unit. This chart indicates
whether a correct relationship exists between system op-
erating pressure and air temperature entering indoor and
outdoor units. If pressure and temperature do not match
on chart, system refrigerant charge may not be correct.
Do not use chart to adjust refrigerant charge.
NOTE: When charging is necessary during heating sea-
son, charge must be weighed in accordance with unit
rating plate +0.6 ounces per foot of ¾ inch liquid line
above or below 15 feet respectively.
Figure 15
Measured Liquid
I I
Pressure (psig) 6 8 10112114
189 60 58 56 54 52
195 62 60 58 56 54
202 64 62 60 58 56
208 66 64 62 60 58
215 68 66 64 62 60
222 70 68 66 64 62
229 72 70 68 66 64
236 74 72 70 68 66
243 76 74 72 70 68
251 78 76 74 72 70
259 80 78 76 74 72
266 82 80 78 76 74
274 84 82 80 78 76
283 86 84 82 80 78
291 88 86 84 82 80
299 90 88 86 84 82
308 92 90 88 86 84
317 94 92 90 88 86
326 96 94 92 90 88
335 98 96 94 92 90
345 1O0 98 96 94 92
354 102 100 98 96 94
364 104 102 100 98 96
374 106 104 102 100 98
384 108 106 104 102 100
395 110 108 106 104 102 100
406 112 110 108 106 104 102
416 114 112 110 108 106 104
427 116 114 112 110 108 106
439 118 116 114 112 110 108
450 120 118 116 114 112 110
462 122 120 118 116 114 112
474 124 122 120 118 116 114
486 126 124 122 120 118 116
499 128 126 124 122 120 118
511 130 128 126 124 122 120
R-410A Required Liquid Line
Temperature (° F) - Cooling
Mode
Rating Plate (required)
Subcooling Temperature (° F)
16
5O
52
54
56
58
6O
62
64
66
68
7O
72
74
76
78
8O
82
84
86
88
9O
92
94
96
98
12 428 01 5100 01