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BEFORE OPERATION
4 BEFORE OPERATION
!
C A U T I O N :
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Turn OFF the main switch when the system must be stopped for a long time period.
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Check that there is no water leakage.
•
Ensure that pressure inside the WEH is not higher than 3 bars.
•
Ensure that the WEH is never accidentally operated before water pumps is activated.
•
Ensure that the WEH is never accidentally stopped later than water pump switch off.
5 AUTOMATIC CONTROLS
The heater operation is controlled by the YUTAKI System Control. Heat demand is calculated by a P+I control inside Control System
which switch ON and OFF WEH in 3 steps as shows following table (for more detail see YUTAKI Service Manual):
Regulation step
Step 0:
Step 1:
Step 2:
Step 3:
6 BASIC TROUBLESHOOTING
!
C A U T I O N
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When water leakage occurs, stop the operation and contact your contractor.
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When you smell or white smoke occurs from the WEH, stop the system and contact your contractor.
No operation
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Check whether the SET TEMPERATURE is set at the correct temperature.
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Check electrical connection from YUTAKI and WEH (Fuse or Circuit Breaker operation)
•
Check Water Temperature and possible Thermostat Cut-Out activation (if higher than 85ºC > thermostat Cut-Out)
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Check Water Pressure and Water Flow (at least 0,1MPa.)
Not heating well
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Check for obstruction of water flow inside Water Circuit.
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Check if the water pressure conditions is not within the operating range.
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Check electrical connection from YUTAKI and WEH.
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In case of non-functioning heater should be checked.
If trouble still remains...
If the trouble still remains even after checking the above items, contact your service contractor and inform the following data:
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Unit Model Name
•
Trouble description
3
PMML0199A rev.4 - 12/2016
R1 - Electric
R2 - Electric
resistance 1
resistance 2
OFF
OFF
ON
OFF
OFF
ON
ON
ON
R3 - Electric
Total power
resistance 3
OFF
0 kW
OFF
2 kW
ON
4 kW
ON
6 kW
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