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EB0025-EB0028-EB0030 Control Panel -
Installation and maintenance manual
EB0030
3. Troubleshooting
Housing Element Stat backup
Housing Element OHS backup
Dual Stat-Element Stat
Dual Stat-Element OHS
E0043
E0044
E0010
Control and Overheat protection. Switch power on/off the contactor coil when
there is a demand for heat.
Control Stats should be set to 63°C if they control the water heating system,
and 45°C if they control the Scutt's heat recovery system. Overheat stats are
preset to 80°C or 90°C.
Part Name:
Adveco Part Number:
Function:
Correct Operation:
Testing:
1. Turn off the power to the system and lock off the isolator.
2. Remove the lid and locate the control and overheat stat.
3. Remove the cabling from the Stat/OHS that is suspect and label the wires.
4. Remove the Stat/OHS that is suspect from the pocket. Once removed let the stat adjust to ambient
conditions.
5. Test continuity between the terminals of the stat/OHS with the control stat dial turned all the way up and the
OHS stat not tripped. Correct value Control stat: open circuit OHS: closed circuit. Replace if incorrect.
6. Turn the Stat temperature setting all the way down, hold the sensor in your hand to warm it, and test
continuity between terminals of the stat (correct value: open circuit) If closed circuit replace stat.
7. With the control stat temperature setting turned all the way down, and the sensor held in your hand, test
continuity between terminals while slowly increasing the setpoint on the stat. The contacts should close when
the dial indicator is around 35C. If the dial indicator is not around 35C when it switches then test calibration.
8. Calibration Test:
Carefully place the Control Stat / OHS sensor in heated water and measure the temperature at which
the stat / OHS changes state. If it is not accurate with the indicator then replace.
9. With the Stat / OHS returned to its pocket and wired up and the control system and settings set so that the
stat/ohs should call for heat measure the voltage between each terminal of the stat / ohs and earth. If they are
both healthy and calling there should be 230V at all terminals. If 0V test controls upstream.
