Hitachi RPC-1.5FSN3 Installation And Operation Manual page 18

SIMULTANEOUS OPErATION
• frost prevention during cooling operation
When the indoor unit is operated at low discharge air
temperature, the cooling operation may be changed to fan
operation for a while to avoid frost formation on the indoor
heat exchanger.
• self-cleaning expansion valve
It is for self cleaning the expansion valve when the operation
is stopped at cooling. The sound which the refrigerant flows
may be heard from the indoor unit during the selfcleaning.
However it is not abnormal.
• Hot start during heating operation
To prevent cold air discharge in the room, the fan speed
is controlled from the slow position and the low position
and then to the set position according to the discharge air
temperature. At this time the louver is fixed horizontally.
during defrosting operation
•
When the outdoor unit is performing the automatic defrosting
operation, the indoor fan is stopped and the louver is fixed
horizontally.
9 simultaneous oPeration
The multiple indoor units can be controlled by one remote control switch (Single: max. 16 units, Twin: max. 8 sets, Triple: max. 5
sets, Quad: max. 4 sets).
Contact a distributor or a contractor for detail.
10 maintenance
!
d a n G e r
• Turn OFF the power source before the maintenance work. If not, it
may cause a fire or an electric shock.
• Perform the maintenance work with stable footing. If not, it may cause
falling or injury.
16 PMML0254A rev.4 - 12/2018
• cooling of indoor unit
When the heating operation is stopped, the indoor fan
operation is maintained at the slow position for the maximum
of 2 minutes to lower temperature of the inside unit.
• Prevention of overload operation
When the outdoor temperature is high (approx. 21ºC)
during heating operation, heating operation is stopped due
to activation of the outdoor thermistor until the temperature
becomes low.
?
n o t e
• This air conditioner is used hot air circulation system for the heating
operation. If the air conditioning room is large or the room temperature
is excessively low, it takes time to warm the whole room. "HOT-ST"
will be turned OFF after heating the room.
• "HOT-ST" may by displayed during or right after the defrosting
operation. It is activated to prevent the cold draft. It is NOT abnormal.
!
c a u t i o n
When the flat panel is opened (closed) or the air filter is attached
(removed), perform the work according to this operation manual. If not, it
may cause falling or injury.
?
n o t e
Do not operate the system without the air filter to protect the indoor unit
heat exchanger against being clogged.