Indications Of Pc-Arfpe In Abnormal Condition; Power Failure; Automatic Control - Hitachi RCIM-1.0FSN4 Installations- Und Betriebshandbuch

Automatic control

6.3 INDICATIONS OF PC-ARFPE IN ABNORMAL CONDITION

6.3.1 Abnormality
• The RUN indicator (Red) is flashing.
• The indoor unit number, the alarm code, the unit model code
and the number of the connected indoor units are displayed
on the LCD.
• In case that the plural indoor units are connected to one
remote control switch, select the object indoor unit on the
LCD to display the information.
7 AUTOMATIC CONTROL
The system is equipped with the following functions.
Three Minute Guard (Enforced Stoppage)
This function is utilized to protect the compressor. When the
function is valid, the compressor does not operate for at least 3
minutes after it stops operating, with the RUN indicator turned
ON. The operation restarts automatically after 3 minutes.
Three Minute Guard (Enforced Operation)
This function is utilized to protect the compressor. When the
function is valid, the compressor does not stop operating for at
least 3 minutes after it starts operating. However, if all indoor
units in the system are stopped by the remote control switch, the
compressor will stop operating.
Oil Return Operation
This function is utilized to prevent oil accumulation in the heat
exchanger of out-of-service indoor unit at cooling operation.
If the indoor unit is stopped continuously for more than 2 hours,
this function is operated for a few minutes.
Frost Prevention During Cooling Operation
This function is utilized to prevent frost formation on the indoor
unit heat exchanger. When the indoor unit is operated at low
discharge air temperature, the cooling operation switches to fan
operation automatically.
Self-Cleaning of Expansion Valve
This function is utilized to clean the expansion valve
automatically when the operation stops during cooling operation.
The sound of the refrigerant flowing may be heard from the
indoor unit during self cleaning operation. However, it is not
abnormal.
Hot Start During Heating Operation
This function is utilized to prevent cold discharged air at start-
up of heating operation, after defrosting operation, etc. The fan
speed automatically switches from Slow to Low and then to the
set fan speed. The fan operation might be stopped for up to 2
minutes. At this time the louvre is fixed horizontally.
9 PMML0363A rev.2 - 08/2016 - P5416559

6.3.2 Power failure

• All the indications are OFF.
• Once the unit stops due to power failure, the operation
will not restart even after the power recovers. Perform the
starting procedures again.
• In case of the instantaneous power failure for 2 seconds or
less, the standard unit restarts the operation automatically.
6.3.3 Electric noise
There could be a case that all the indications are OFF and
the unit is stopped. This is due to the activation of the micro
computer for the unit protection from the electric noise.
Perform the starting procedures again.
Defrosting Operation
The indoor fan stops during defrosting operation to prevent
cold air from being discharged. At this time the louvre is fixed
horizontally.
Cooling of Indoor Unit
When the heating operation is stopped, the indoor fan operation
(fan speed: Low) might continue for up to 2 minutes to lower the
temperature of the inside of the unit.
Automatic Defrosting Cycle
When the heating operation is stopped by pressing RUN/STOP
switch, frosting on the outdoor unit is checked and the defrosting
operation may be performed for the maximum of 10 minutes.
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.
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N O T E
• Except in the case of a long period of shutdown, keep the main power
switch ON. The drain discharge mechanism is operated if the drain
level is higher than the setting.
• If the system is stopped due to a power failure, it will not automatically
start again even after power is restored. Repeat the start-up
procedure from Step 1 to start the system. In case of the power failure
for 2 seconds or less, the standard unit memorize all the operation
modes and restarts the operation automatically after approximately
3 minutes.
• This air conditioner adopts 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 be displayed during or right after defrosting operation.
It is activated to prevent the cold draft. It is NOT abnormal.