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FINAL INSTALLATION PROCEDURES
Refrigerant Trim Charge, Finishing the Job
Refrigerant Trim Charge
The single zone system will 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 values 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 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 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.
WARNING
•
Never inhale or handle refrigerant directly. 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.
Refrigerant Line Length Derates
For air-cooled systems, a capacity correction factor will have to be applied to account for the length of the system's refrigerant pipe. Rate of
change in capacity due to increased piping lengths is shown below.
Table 24:
Piping Length (ft.)
Cooling Capacity Coefficient Factor
Rate of Capacity Change (%)
Heating Capacity Coefficient Factor
Rate of Capacity Change (%
• Capacity is based on standard length.
• Equivalent Pipe Length = Actual Pipe Length + Number of Bends x 0.3.
• Additional Refrigerant Charge Calculation : X (g) = [ (Refrigerant Pipe Length) - (No Charge Pipe Length) ] × (Additional Refrigerant).
•
62
LH188HHV1 (18,000 Btu/h)
LH248HHV1 (24,000 Btu/h)
LH188HHV1 (18,000 Btu/h)
LH248HHV1 (24,000 Btu/h)
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
24.6
32.8
49.2
65.6
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
Figure 85: Gauge Manifold Hose Con-
nected to the Schrader Valve on the
Gas (Vapor) Service Port. (Appearanc-
es Will Vary Depending on Model.)
Gauge Manifold
Figure 86: Charging R410A Refrigerant.
(Appearances Will Vary Depending on
Model.)
98.4
131.2
164.0
196.9
98.8
97.5
96.3
-
98.8
97.5
96.3
-
98.8
97.5
96.3
-
98.8
97.5
96.3
-
Micron
Gauge
Gauge Manifold
Micron
Gauge
229.7
246.0
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-
-
-
-
-
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