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Charging the System
The condensing unit is pre-charged with 36 oz. of HFC-410A refrigerant. The installer will add HFC-410A refrigerant
for the dehumidifier and line set.
1. Calculate the amount of HFC-410A required by determining the length of the line set and performing the
calculation below:
11oz + 2.2oz per every 10 feet of line set length = Total charge required
2. Connect a cylinder of HFC-410A refrigerant to the center port of the manifold gauge set. Position the HFC410A
refrigerant cylinder to deliver liquid only.
3. Open the valve on the HFC-410A cylinder.
4. Place the HFC-410A cylinder on a refrigerant scale and zero the scale.
5. Open the valve on the gas line stub valve core removal tool.
6. Open the low pressure side of the manifold gauge set and weigh in the amount of HFC-410A calculated in step
1.
7. Close the valve on the HFC-410A cylinder and the low pressure side of the manifold gauge set.
8. Close the valve on the gas line stub valve core removal tool.
9. Remove the high and low pressure sides of the manifold gauge set from the valve core removal tools.
10. Install the valve core in the gas line stub port using the no-loss valve core removal tool
11. Remove the no-loss valve core removal tools from the service ports on the liquid and gas line stubs.
12. Install the caps on the service ports of the liquid and gas line stubs finger tight, then tighten
an additional 1/6 turn. Check the service port caps for leakage – reinstall if necessary.
HFC-410A
18
Ultra-Aire SD12 Installation Instructions
LINE SET INSTALLATION
OUTDOOR
UNIT
LOW
HIGH
MANIFOLD
GAUGE SET
TO VAPOR
SERVICE
VALVE
RECOMMEND
MINIMUM 3/8" HOSE
www.Ultra-Aire.com | (800) 533-7533
1/12 turn
12
11
1
10
2
9
3
8
4
7
5
6
1/6 turn
12
11
1
10
2
3
9
8
4
7
5
6
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