Communication Loss - Hitachi ATW-RTU-07 Installations- Und Betriebshandbuch

Communication Loss

6 If binding has been successful the number indicates the
signal strength (1 = min to 5 = max). If binding fails,
appears on screen. Please try again.
Successful binding
Failed binding
7 The LED on the RF receiver is constantly ON to indicate that
the RF receiver is correctly linked with a thermostat.
?
N O T E
Binding can be cancelled from the binding screen by touching and holding
on the right touch zone for approximately 10 seconds.
4 COMMUNICATION LOSS
In case of alarm the LED on the RF Receiver flashes 150 ms
ON and 150 ms OFF. The following list shows which types of
communication fails makes the RF receiver to enter into alarm
state.
• If there is a communications fault between the RF Receiver
and the Room Thermostat.
• If there is a fault in communications between the YUTAKI
and RF Receiver.
• If there is one Room Unit installed and communications is
lost with that zone.
• If there is more than one Room Unit installed, as in multi-
5 FAIL-SAFE MODE SETUP
The fail-safe mode defines the system status if the RF
communication is lost (e.g. when the Room thermostat stops
communicating due to discharged batteries).
6 TROUBLESHOOTING
Symptom (Fault Message)
The receiver box does not
react to setpoint changes on
the room thermostat.
The LED shows alarm
8 PMML0502 rev.1 - 01/2021
Possible Cause
The room thermostat and receiver box are
not bound.
There is no communication between
YUTAKI Unit and RF receiver.
The receiver box receives no RF messages
from the room thermostat.
RF signal is blocked due to wrong location
of the room thermostat.
Room thermostat batteries are exhausted.
Faulty receiver.
8 If binding is unsuccessful, LED will flash. In this case,
change the location of the room thermostat and repeat the
procedure.
9 In case that there are 2 room thermostats and thermostat
1 is already linked, LED will be stay ON even if binding is
unsuccessful for thermostat 2.
10 Perform this step in case started from step 1. Repeat
the procedure from step 2 to 8 to bind the second room
thermostat.
?
N O T E
• Note that the RF receiver closes the binding window after 2 minutes
of inactivity.
• The first binding is saved as Thermostat 1, and the second binding (if
necessary) is saved as Thermostat 2.
• The selection of the zone in which Room thermostat will be used is
done at the Room thermostat menu in the YUTAKI LCD Controller
(PC-ARFH1E).
zone systems for example, and communications is lost with
one zone.
• If there is more than one Room Unit installed, as in multi-
zone systems for example, and communications is lost with
both zones.
In case of alarm, check wireless thermostats and check also
YUTAKI LCD Controller (PC-ARFH1E) to determine reason of
alarm.
?
N O T E
LED also shows alarm in case of faulty RF receiver.
The system will continue to operate at the last communicated
setpoint.
Reset the receiver box by pressing and holding the push button
for 15 seconds. Then follow the binding / rebinding procedure as
described in section "3 Binding the Wireless thermostat and RF
Receiver".
Check H-LINK connection wire between YUTAKI Unit and RF
receiver and replace it if necessary.
Re-locate the room thermostat.
Replace batteries in the room thermostat.
Change the receiver.
Remedy