Line Set Sizes - Geostar ASTON Series Installation Manual

Refrigeration cont.
Determining Subcooling
1. Measure the temperature of the liquid line on the small
refrigerant line (liquid line) just outside the split cabinet.
This location will be adequate for measurement in both
modes unless a significant temperature drop in the liquid
line is anticipated.
2. Measure the liquid line pressure by attaching refrigerant gauges
to the schrader connection on the liquid line service valve.
3. Convert the pressure obtained in Step 2 to the saturation
temperature by using the Pressure Temperature Conversion
Chart for R-410A.
4. Subtract the temperature in Step 1 from the temperature in
Step 3. The difference will be the subcooling value for that
unit. Refer to the Operating Parameters tables for subcooling
ranges at specific enter water conditions.

Line Set Sizes

Unit Air
Size Handler
026 GAH026
038 GAH036
049 GAH048
064 GAH060
072 GAH060
NOTES: * The "Charge Amount with GAH Air Handler" column is based on the charge amount for an GAH Air Handler + Compressor Section Split.
Additional charge will have to be added accordingly for line set length.
After charge is added, adjustments can be made to get appropriate subcooling and superheat.
Additional charge for R-410A is 0.50 oz. per ft. for 3/8 in. and 1.0 oz. per ft. for 1/2 in. tube.
20 feet
Suction Liquid Suction
5/8" OD 3/8" OD 3/4" OD
3/4" OD 3/8" OD 3/4" OD
3/4" OD 3/8" OD 7/8" OD
7/8" OD 1/2" OD 7/8" OD
7/8" OD 1/2" OD 7/8" OD
ASTON DUAL-CAPACITY OUTDOOR SPLIT SERIES INSTALLATION MANUAL
40 feet
Liquid Suction
3/8" OD 3/4" OD
3/8" OD 3/4" OD
3/8" OD 7/8" OD
1/2" OD 1-1/8" OD
1/2" OD 1-1/8" OD
27
60 feet
Factory
Charge (oz.)
Liquid
1/2" OD 52
1/2" OD 56
1/2" OD 90
1/2" OD 92
1/2" OD 104
*Charge
Amount with
GAH Air
Handler (oz.)
74
86
115
112
132
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