LG LS243HLV3 Engineering Manual page 44

EQUIPMENT SELECTION PROCEDURE
Correction Factors
Check the Indoor and Outdoor Unit Selection(s)
Compare the corrected cooling and heating capacities to the load calculations. Is each capacity sufficient for the zone it serves?
For the indoor unit, the corrected capacity must be at least equal to the total of the cooling design load (plus ventilation load, if applicable) for
the space served by the indoor unit. For the indoor unit, the corrected capacity also must be at least equal to the total of the heating design
load (plus ventilation load, if applicable) for the space(s) and / or thermal zone served by the indoor unit.
The outdoor unit selected must be large enough to offset the total cooling load for the space it serves (account for ventilation air cooling
load if the ventilation air has not been pretreated to room neutral conditions). The outdoor unit must also be large enough to offset the total
heating load for the space it serves.
If the corrected heating capacity ratio exceeds 100%, reselect the equipment, or change the system design by moving some of the load to
another system.
System Sizing Check Formulas
1. Outdoor Unit Rated Capacity.
Q (From capacity tables).
odu(rated)
2. Outdoor Unit Capacity at Ti, To Temperature.
Q (From capacity tables).
odu(Ti, To)
3. Outdoor Unit Capacity Coefficient Factor.
F = Q / Q
(Ti, To) odu(Ti, To) odu(rated)
Conclusions and Recommendations
• Understand the design safety factors.
• Reference load calculations for actual cooling and heating capacities (applies in 99% of applications – consider total load when latent load
is greater than 30%).
• Verify that the sensible load of the zone is satisfied.
• Use caution when sizing to meet listed capacity specifications for the scheduled manufacturer's equipment.
If further system design assistance is needed, or you have a unique application you would like to discuss, contact your LG sales rep.
44 | PERFORMANCE DATA
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4. Piping Correction Factor (From Capacity Coefficient
Factor Tables).
F for each piping length
(length)
5. Individual Indoor Unit Combination Capacity.
Q = Q x Q / Q
idu (combi) odu(rated) idu(rated)
6. Individual Indoor Unit Actual Capacity.
Q = Q x F x F
idu (actual) odu(combi) (Ti, To)
idu(rated-total)
(length, altitude)