9
GEO16-501.4
Leak Testing and Evacuating the
Refrigeration System
Pressurize the line set and air coil with 150 psi dry nitrogen
and thoroughly check for leaks. Once a leak free system is
verified, purge the system and evacuate the line set and air
coil to at least 500 microns. Use both service ports to prevent
false readings. A quality vacuum pump capable of accurately
measuring vacuum depth is required to ensure system is ready
for charging. System must hold vacuum for a minimum for 30
minutes.
Charging the System
Do not overcharge the system. Charge all systems by weight
as determined from Table 9.2 and the supplied factory charge.
Factory charge includes, split unit charge, A-coil charge and
a 25' line set. If the line set varies from 25', then a charge
adjustment must be calculated.
INSTALLATION
Equivalent Line Length
Air Handler
Size
A-Coil Size
Split Unit
Size
20 Feet
40 Feet
60 Feet
Split Unit
Factory
Charge (oz)
- No HWG
Split Unit
Factory
Charge (oz)
- w/HWG
Suction
Liquid
Suction
Liquid
Suction
Liquid
024
024
024
5/8"
3/8"
5/8"
3/8"
3/4"
3/8"
93
96
036
036
036
3/4"
3/8"
3/4"
3/8"
3/4"
1/2"
99
103
048
048
048
3/4"
3/8"
7/8"
3/8"
7/8"
1/2"
125
128
060
060
060
7/8"
1/2"
7/8"
1/2"
1-1/8"
1/2"
171
175
072
N/A
072
7/8"
1/2"
7/8"
1/2"
1-1/8"
1/2"
171
175
Table 9.2 - Line Sizing and Initial Refrigerant Charges
Initial system charge includes Split unit charge, 25' line charge, and Air Coil charge. Adjust charge via actual system subcooling and superheat measurements.
Additional charge for R-410A is 1.0 oz/ft for 1/2" line and 0.5 oz/ft for 3/8" line
Table 9.1 - Initial Split Unit TXV Superheat Settings
Verify final settings after initial adjustments.
Models
024
036
048
060
072
TXV Turns
Closed
3-1/4
4-3/4
5-1/4
6-1/4
5-1/4