4. Capacity and selection data
TCGB0075 rev.0 - 11/2012
77
4
4.3 Correction factors
4.3.1 Defrost correction factor
The maximum heating capacity shown above does not include operation during frost or defrosting.
When this type of operation is taken into account, the heating capacity must be corrected according to the following equa-
tion:
Correction heating capacity = Correction factor x heating capacity
Outdoor inlet air temp. (ºC WB)
(HR = 85% )
-20
-15
-10
-8
-5
0
2
5
≥6
Defrost correction factor
f
d
0.90
0.89
0.89
0.88
0.86
0.85
0.85
0.95
1.00
N O T E
•
Defrost correction factor corresponds
to a relative humidity of 85%. If the con-
dition changes, the correction factor
will be different.
•
Defrost correction factor is not valid for
special conditions such as during snow
or operation in a transitional period.
Heating
capacity
Reduced
capacity
due to frost
build-up
Time
Max. defrost 10 min.
1 cycle
4.3.2 Piping length correction factor
The correction factor is based on the equivalent piping length in meters (EL) and the height between outdoor and indoor
unit in meters (H).
H:
Height between indoor unit and outdoor unit (m).
-
H>0: Position of outdoor unit is higher than position of indoor unit (m).
-
H<0: Position of outdoor unit is lower than position of indoor unit (m).
L:
Actual one-way piping length between indoor unit and outdoor unit (m).
EL
: Equivalent one-way piping length between indoor unit and outdoor unit (m).
-
One 90º elbow is 0,5 m.
-
One 180º bend is 1,5 m.