Correction Factors According To Defrosting Operation - Pioneer YH1824GHFD18R2 Technical & Service Manual

5.
CAPACITIES AND SELECTION DATA
The correction factor of height between indoor unit and outdoor unit
Height difference
Factor
To ensure correct unit selection, consider the farthest indoor unit.
:
NOTE
1. Above data is assuming that the height difference between indoor unit and outdoor unit is 0m.
2. Be sure to minimize length of connection pipes to optimize performance. If the outdoor unit is installed higher
or lower than the indoor unit, it is necessary to apply height correction factor additionally to length correction
factor to calculate cooling/heating.
If outdoor unit is higher, correction should be applied to cooling capacity, if outdoor unit is lower, correction
should be applied to heating capacity.

5.3 Correction factors according to defrosting operation

The heating capacity in the previous part, excludes the condition of defrosting operation period. In
consideration of defrosting operation, the heating capacity is corrected by the equation below.
Corrected heating capacity = Defrost correction factor × unit capacity
Outdoor temperature
[℉(℃)DB]
Correction factor
(humidity rate 85% RH)
Correction Factor
Heating
capacity
NOTE:
The correction factor is not valid for special conditions such as snowfall or operation in a transitional period.
16ft (5m)
0.01
5(-15) 14(-10)
0.95 0.95
Reduction in capacity due
to white frost
1 cycle
23
33ft (10m)
0.02
23(-5) 32(0) 44.6(7)
0.93 0.85 1.0
Hour
Defrost max. 12mins
108ft (30m)
0.025
50(10) 59(15)
1.0 1.0