88-A4HP4001-1E-EN
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STEP 1
- Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recom-
mended method of charging above 55º F ambi-
ent outdoor temperature. See Section 14.2.
For outdoor temperatures below 55º F, see Sec-
tion 14.3.
Note:
It is important to return in the spring
or summer to accurately charge the system
in the cooling mode when outdoor ambient
temperature is above 55º F.
For best results the indoor temperature should
be kept between 70º F to 80º F.
STEP 1
- Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
Note:
Use this method when matched with a
TXV or EEV indoor unit.
Section 14. System Charge Adjustment
(Systems can be rated with TXV, EEV or Piston)
14.1 Temperature Measurements
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
LIFT
Indoor Temp
80º F
70º F
Outdoor Temp 1
55º F
120º F
Outdoor Temp 2
See Section 14.3 for
Outdoor
Temperatures
Below 55º F
See Section 14.2 for
Outdoor
Temperatures
Above 55º F
55º F
NOTE:
For systems using a indoor piston metering device, refer to the Superheat charging method and chart.
For systems using a TXV or EEV indoor metering device, refer to Subcool charging method and charts.
