Hitachi UTOPIA R32 Series Technical Catalogue

4 Capacities and selection data
Defrost Operation correction factor (fD)
TCGB0136 rev.1 - 05/2021
59
4
4.7 Defrost Operation correction factor (f
D
)
The heating capacity does not include operation during frost or defrosting.
When this type of operation is taken in account, the heating capacity must be corrected according to the following
equation:
Correction heating capacity = Correction factor x heating capacity
Outdoor inlet air temperature (ºC DB) -7 -5 -3 0 3 5 7
Correction factor 0.95 0.93 0.88 0.85 0.87 0.90 1.00
? NOTE
• Defrostcorrectionfactorcorrespondstoarelativehumidityof85%.
Ifthecondition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
1 cycle
Time
Max. defrosting
4.8 Correction ratio due to humidity (CR)
The cooling capacity data for the outdoor units is taken from the cooling capacity tables. The tables are calculated on the
basis of a relative humidity of 50%.
In some situations, it’s possible that the temperature condition of the ambient to be conditioned, species other different
relative humidity, which affect at the Dry Bulb temperature. In this cases, it’s necessary to calculate the difference
between the indoor air inlet dry bulb temperature required by the system and the indoor air inlet dry bulb temperature
shown in the cooling capacity data.
This temperature difference requires an adjustment of the cooling capacity of the system.
Q
AC
=Q
C
+ (CR x (DB
R
- DB))
Model CR
RAS-3HVRC2 0.34
RAS-4H(V)(R/N)(C/P)2E 0.43
RAS-5H(V)(R/N)(C/P)2E 0.51
RAS-6H(V)(R/N)(C/P)2E 0.59
4.9 Correction factor according to altitude (f
AL
)
The capacity is affected by the altitude of the installation location. When the altitude is above sea level, capacity must be
corrected with the altitude correction factor according to the following equation:
Correction capacity = Altitude Correction factor x Capacity
Altitude (m) 0 300 600 900 1200 1500 1800 2100 2400 2700 3000
Correction factor 1 0.97 0.94 0.90 0.88 0.84 0.81 0.78 0.75 0.72 0.69

Hitachi UTOPIA R32 Series Specifications

General

Brand	Hitachi
Model	UTOPIA R32 Series
Category	Air Conditioner
Language	English