Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 136

15-5. Power Outage Automatic Recovery Operation
• Whenever a power outage or switching of the power supply causes the power supply of an operating air conditioner to go
from OFF to ON, this function will automatically restore the operation of the air conditioner to its previous operating mode.
w If the power is turned from OFF to ON when the air conditioner is not in operation, the air conditioner will not automatically
be turned on. However, the timer operation will be cancelled if the air conditioner is in timer operation (including when the
unit is waiting for its start time). Setting for timer operation must be performed once again.
• If there is a momentary power outage of less than one second while the air conditioner is in operation, there may not be a
clear determination of whether or not there was a power failure. When it has been determined that there has been a power
failure, recovery will take approximately four minutes after the power is restored. Please wait. (Once "H0" has appeared on
the display, a protection system will operate to prevent the unit from restarting for three minutes.)
When it has been determined that there has been no power failure, operation will continue as is.
• Settings can be made by function selections from the remote controller.
• When there is group control, selection of all refrigerants is required.
15-6. Individual control operation from a separate room
• By simply centralizing the remote controllers installed in each room in a separate control room, individual control or central-
ized monitoring of the air conditioners in each room can be attained.
• Air conditioner control can be performed up to a total of 500 meters away by connecting the indoor units and remote con-
trollers with 0.3 to 1.25 mm
Remote controller
Control room
• If a remote controller is installed in a room and control room, refer to the section on operating with two remote controllers.
15-7. Combined Remote/Hand-held Control
• Operation/remote controller prohibit/ stop can be controlled from a remote location by routing the remote stop/start adapter
(PAC-SE55RA-E sold separately) through the relay box installed on site. When this remote control is cancelled, the hand-
held remote controller can be used for operating and stopping the air conditioner.
1. Basic system wiring
• Use the remote start/stop adapter (PAC-SE55RA-E) and connect the "Start/Stop Circuit From Remote Location" that comes
from the relay box and remote/hand-held selection switch and connect it to the CN32 connector on the printed circuit board
for the indoor unit
<Points of precaution>
1 1 Match the rated power supply voltage of the remote/hand-held selection switch and relay (X2) with the power supply for the
controller.
2 2 When performing group control of multiple outdoor unit using a timer, be sure to arrange the timer so that all units do not start
at the same time. If this is not performed, all of the units will start at one time creating an over current that will cause the circuit
breaker to operate.
3 3 An on-delay system is one that includes specifications for operating a limited time when an on signal is received and has a tem-
porary off timer for recovery operations.
4 4 Use a connecting relay when the wiring length exceeds 10 meters, such as when performing remote wiring. If this is not pro-
vided, abnormal operation will occur.
(1). System diagram
Control circuit
power supply
W The AC for the control room is usually disconnected from the remote/hand-held control system.
2-core cable.
2
Indoor unit
room 1
Relay box
Indoor unit
Remote
controller
Remote/Hand-held
selection switch
Control room W
Indoor unit
room 2
Relay box
Indoor unit Indoor unit
Remote Remote
controller controller
room 1 room 2
136
Indoor unit
room 3
Relay box
Indoor unit
Remote
controller
room 3