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Final Installation Procedures
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FINAL INSTALLATION PROCEDURES
Refrigerant Trim Charge, Finishing the Job
Refrigerant Trim Charge
A single zone system could need an additional refrigerant charge if the installed piping lengths
are greater than the “piping length (no additional refrigerant, ft.) specification” listed in the product
tables. See the product sections in the engineering and installation manuals. The system must have
the right amount of refrigerant; if the amount of refrigerant level is low, the system will not perform
properly. The additional refrigerant charge can be calculated manually using the information in the
engineering and / or installation manuals, or by LATS.
1. Keep the outdoor unit service valves closed while adding the trim charge to the system. Charge
through the Schrader port. See specification tables in the front of this installation manual for
base charge, and see below (or the LATS report) for the correct additional refrigerant trim charge
amounts for each system.
2. Connect the gauge manifold hose to the gas (vapor) suction Schrader port on the gas service
valve.
3. Connect the gauge manifold hose to the refrigerant cylinder. These systems use R410A refrig-
erant, which must be charged in the liquid state. Verify that the R410A refrigerant cylinder is
upside-down.
4. Open both the vapor (gas) and the liquid service valves on the outdoor unit. To open, rotate the
valves counter-clockwise by using an Allen wrench.
5. Charge the refrigerant by adjusting the low-pressure valve of the gauge manifold. See the “Sug-
gested Amount of Refrigerant Charge” below, or on the LATS report.
6. After the correct amount of additional refrigerant is charged, close the low-pressure valve of the
gauge manifold, and remove the low-pressure hose from the outdoor unit.
•
Never inhale or directly handle refrigerant. Doing so will cause bodily injury.
• Follow all local, state, and federal guidelines when handling refrigerant. If all regulations are not
followed, it will cause bodily injury.
• Capacity is based on standard length.
• Equivalent Pipe Length = Actual Pipe Number of Bends x 0.3.
• Additional Refrigerant Charge Calculation : X (g) = [ (Refrigerant Pipe Length) - (No Charge Pipe Length) ] × (Additional Refrigerant).
•
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Table 21: Single Zone Extended Piping Refrigerant Piping System Additional Refrigerant Charge.
Model Numbers
Refrigerant Piping Length (feet)
16.4
24.6
32.8
41
49.2
65.6
82
98.4
114.8 131.2 147.6 164.0
LS243HLV3
(LSN243HLV3 / LSU243HLV3)
Additional
Refrigerant
Charge (oz.)
0
0
3.1
6.2
9.3
15.6
21.8
28.0
34.3
40.5
46.7
53.0
LS303HLV3
(LSN303HLV3 / LSU303HLV3)
0
0
3.1
6.2
9.3
15.6
21.8
28.0
34.3
40.5
46.7
53.0
LS363HLV3
(LSN363HLV3 / LSU363HLV3)
0
0
3.1
6.2
9.3
15.6
21.8
28.0
34.3
40.5
46.7
53.0
Figure 111: Gauge Manifold Hose
Connected to the Schrader Valve on
the Gas (Vapor) Service Port.
Figure 112: Opening the Outdoor Unit
Service Valves Counter-clockwise.
Figure 113: Charging R410A Refriger-
ant.
Gauge Manifold
Micron
Gauge
Gauge Manifold
Micron
Gauge
