Basic Troubleshooting - Hitachi DHWT Serie Manuel D'installation Et De Fonctionnement

7 1 Automatic controls
7 AUTOMATIC CONTROLS
The Sanitary tank operation is controlled by the Yutaki system
control. Heat demand is calculated by control and water tempe-
rature thermistor inside the tank (already supplied into the tank).
Front of panel

8 BASIC TROUBLESHOOTING

C A U T I O N
• When water leakage occurs, stop the operation and con-
tact your contractor.
• When you smell or white smoke occurs from the DHWT,
stop the system and contact your contractor.
NO OPERATION
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- Check whether the SET TEMPERATURE of YUTAKI sys-
tem is set at the correct temperature.
- Check electrical connection from Controller System and
DHWT (Fuse or Circuit Breaker operation)
- Check Water Temperature and possible Thermostat Cut-
Out activation (if higher than 90ºC > thermostat Cut-Out)
Check Water Pressure and Water Flow (at least 0.1MPa.)
-
Check that manual thermostat of DHWT are set at maxi-
-
mum water set point by YUTAKI System control (Check
water set point by Anti-Legionella)
11 PMML0198A-rev.1 - 04/2011
All manuals and user guides at all-guides.com
In case of outdoor unit failure and switching to Manual mode
(SW1), DHWT Heater will be controlled by Adjustable water
thermostat that it is located in control panel.
In case of Automatic mode, put Adjutable water thermostat at
maximum operation setting by Yutaki (pay attention in anti-
legionella function).
Rear of panel
NOT HEATING WELL
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IF TROUBLE STILL REMAINS...
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If the trouble still remains even after checking the above items,
contact your service contractor and inform the following data:
N O T E
Mark Name
Te Thermometer
WT Regulating thermostat and safety limit
Re Operating EH Relay
SW1 Switch (AUTO/MANUAL)
TB Terminal Board
LD1 Power ON
LD2 AUTOMATIC ON
LD3 HEATER ON
- Check for obstruction of water flow inside Water Circuit.
- Check if the water pressure conditions is not within the
operating range.
- Check electrical connection from Controller System and
DHWT.
- In case of non-functioning heater should be checked.
- Unit Model Name
- Trouble description