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Do not over-tighten a flared joint. Flared connections should always be accessible and must be insulated to prevent
condensation.
INDOOR UNIT
Maximum
Elevation -
Outdooor
Unit BELOW
Indoor Unit
Outside Unit BELOW Indoor Unit
Line Set Diameters (in.)
System
Size (KBtu)
Liquid
009
1/4
012
1/4
018
1/4
024
3/8
Adding Refrigerant for Longer Line Set
The outdoor unit is factorycharged with refrigerant
to accommodate up to 25 feet of line set. For adding
additional refrigerant for longer line sets, see "Table 5.
Line Set Guide".
Be sure to add the proper amount of additional refrigerant.
Failure to do so may result in reduced performance.
Leak Test and Evacuation
Air and moisture remaining in the refrigerant system will
have undesirable effects as indicated below:
•
Pressure in the system rises.
•
Operating current rises.
•
Cooling or heating efficiency drops.
•
Moisture in the refrigerant circuit may freeze.
•
Water may lead to corrosion of parts in the refrigera
tion system.
The line set between the indoor and outdoor units
must be leak tested and evacuated to remove any non
condensables and moisture from the system.
Leak Test
Use the following procedure to test for system leaks:
1. Connect the manifold gauge set and dry nitrogen gas
cylinder to the suction and gas service ports.
IMPORTANT
Maximum Line Set
Length
OUTDOOR UNIT
Minimum Line Set
Length - 10 ft. (3m)
Figure 26. Indoor and Outdoor Unit Elevation Relationships
Table 5. Line Set Guide
Each system size has a line set length and vertical elevation parameters.
Maximum Elevation
Outdoor Unit BELOW
Indoor Unit - Feet
Gas
(Meter)
3/8
82 (25)
1/2
82 (25)
1/2
98 (30)
5/8
98 (30)
Maximum Line Set
Length
INDOOR UNIT
Outside Unit ABOVE Indoor Unit
Maximum
Elevation
Maximum Line
Outdoor Unit
Set Length -
ABOVE Indoor
Feet (Meters)
Unit - Feet (Meter)
33 (10)
82 (25)
33 (10)
82 (25)
66 (20)
98 (30)
66 (20)
98 (30)
2. Open valve on nitrogen cylinder.
3. Pressurize the system per the pressure test
specifications
Specifications".
4. Check that the system pressure remains stable. If
there is any movement check system for leaks.
5. After the system is found to be free of leaks:
•
Close valve on nitrogen cylinder.
•
Relieve the nitrogen pressure by: loosening the
charge hose connector at the nitrogen cylinder.
•
When the system pressure is reduced to normal,
disconnect the hose from the cylinder.
Table 6. Pressure Test Specifications
Bar
Psig
kPa
1
3
44
303
2
15
220
1517
3
32
470
3241
4
45
650
4482
5
32
470
3241
IMPORTANT
Use only oxygen-free nitrogen (OFN).
12
Minimum Line Set
Length - 10 ft. (3m)
OUTDOOR UNIT
Maximum
Elevation -
Outdooor
Unit ABOVE
Indoor Unit
Additional Refrigerant for
greater than 25 Foot Line Set
Lenght
For the additional charging, we
recommend 0.161 oz. for 1/4"
liquid line and 0.322 oz. for 3/8"
liquid line per foot.
in
"Table
6.
Pressure
Duration
Minimum of 10 minutes
Minimum of 10 minutes
Minimum of 10 minutes
1 hour. Stress test to prove the
integrity of the complete installation.
24 hours. Lower system pressure
test, after confirmation No. 4 was
successfully completed.
Test
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