123
P. APPENDICES
Appendix F – Refrigerant Charging Charts (Cont.)
SYSTEM CHARGE CHART – REFRIGERANT 410 A
1. This is required to fine-tune unit charge.
2. The Indoor ambient temperature must be
between 72 °F and 82 °F dry bulb at the indoor
coil.
3. Confirm the indoor air supply is at the rated
CFM listed in
Appendix A
.
4. Allow the system to run long enough for
temperatures and pressures to stabilize; at least
fifteen minutes.
5. Measure liquid pressure and line temperature
at the liquid line service port (refer to
Section J.4.2.1.
for the liquid line
temperature measurement location). BE SURE
TO USE ZERO LOSS FITTINGS WHILE
MEASURING 82
6. To find the saturation temperature at the
measured pressure, subtract the measured
liquid line temperature from the saturation
pressure to get the sub-cooling.
7. Check if the Sub-Cooling is /- 2.0 °F
tolerance.
8.If the sub-cooling values are significantly
different (> 20 psig) from those listed on the
table in
Appendix F
, there may be an airflow
or component issue. Refer to section M.
Diagnostics for more information.
PRESSURE REQUIREMENTS – GROSS CHARGE CHECK
(REFER CHARGE CHART)
OUTDOOR DRY
BULB (°F)
7.5 -TON
8.5 -TON
10 -TON
12.5 -TON
LIQUID /VAPOR PRESSURE (PSIG)
115
510.2/147.22
504.13/141.62
500.9/138.5
497.1/138.6
105
450.64/144.8
443.53/139.2
436.5/143.9
438.5/136.5
95
398.19/144
393.38/136.06
389.3/134.1
384.6/134.9
85
354.59/140.06
341.45/135.13
337.5/132.1
336.1/133.5
75
311.67/136.7
297.72/133.41
294.2/130.4
293.1/132.1
65
272.9/132.96
261.32/130.57
255.3/128.6
255.2/130
55
243.58/131.27
230.36/127.47
218.1/125.8
219.8/125.8
SUB COOLING REQUIREMENTS – FINAL CHARGE VERIFICATION
OUTDOOR DRY
BULB (°F)
7.5 -TON
8.5 -TON
10 -TON
12.5 -TON
SUBCOOLING (°F)
115
12.1
15.6
15.8
13.3
105
10.8
14.9
14.2
13
95
9.8
14.2
15.5
12.4
85
9.8
13
13.8
10.8
75
8.1
11.7
13
9.7
65
11.7
11.2
12
9.3
55
11.8
12.2
10.7
10.6
Summary of Contents for Climate Master RGED Series
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