Setback Operation; In Abnormal Condition; Abnormality; Power Failure - Hitachi RPC-5.0FSR Operation Manual

A setback operation requires extra settings.
Refer to the "Installation & Maintenance Manual"
for the wired controller and the "Service Manual"
for details.
10.1.7 Setback Operation
Setback operation is mainly to sustain a comfort
room air temperature while occupants are out of
the room.
If the setback operation is enabled, the setpoint is
adjusted for setback.
During this time, "Setback" is displayed on the
LCD.
Refer to the "Installation & Maintenance Manual"
for the wired controller and the "Service Manual"
for details.
Meeting Room
A/C
MODE SPEED
AUTO
LOUV.
10.2 In Abnormal Condition

10.2.1 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 wired controller, select the
object indoor unit on the LCD to display the
information.
10.2.2 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.
10.2.3 Electromagnetic Interference (EMI)
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 Electromagnetic Interference
(EMI). Perform the starting procedures again.
A10762290A
LOUV. TEMP
28
Avoid
.0
Setback
Adj.

11. Automatic Control

The system is equipped with the following
functions.
NOTE
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.
● Three Minute Guard (Enforced Stoppage)
This function is utilized to protect the
compressor. When the function is valid, the
compressor does not operate the unit 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 wired controller, 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 louver is fixed horizontally.
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