Description Of The Optional Functions; Control Of The Indoor Unit Fan During Thermo-Off In Heating Mode (Fa); Night Mode (Low Noise) (Ni) - Hitachi RAS-(3-6)HVNC1(E) Service Manual

6 Optional functions
6.2.2 Description of the optional functions
Control of the indoor unit fan during Thermo-OFF in heating mode (FA)
Press PSW1 and select the setting condition "1" at the circulator function at heating thermo-OFF "FA".
In case that the fan speed is changed to "LOW" at heating Thermo-OFF, there is a case that the room air temperature is
too high at heating Thermo-OFF.
In this case, the circulator function at heating thermo-OFF is recommended, and its function explains below.
The indoor fan operates and stops for 6 minutes in 2 minute cycle when the activation conditions are satisfied.
• Operation
When the indoor unit is at thermo-OFF during the heating operation.
Fan Motor Operation
Fan Motor Stop
N O T E
When the indoor fan is stopped by another control, it is not available to operate indoor fans.
Night mode (Low noise) (ni)
Press PSW1 and select the setting condition "1" at the night shift (low noise) "ni". Then, this function can be set (only in
cooling operation).
The outdoor fan operation is controlled by fan controller as shown below.
The night shift operation shall be applied in case that the cooling capacity has the margin to be allowed for the capacity
decrease and the low sound operation is required especially in the nighttime.
• Outdoor Fan
Maximum rotation
(Rotation ratio)
N O T E
When the outdoor temperature is lower then 30ºC in the cooling operation, the compressor frequency and the outdoor fan
speed will be operated low. In this case, the cooling capacity decreases to approximately 60% at the same time.
175
SMGB0087 rev.0 - 12/2013
2 (min.) 6 (min.)
80%
60%
22 25
Outdoor Temperature (ºC)
2 (min.) 6 (min.)
110%
30 33
6