Hubbell JHX, Инструкция по установке, эксплуатации и обслуживанию, Страница: 31 / 44

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Advanced Troubleshooting:
WARNING:
Serious bodily injury or death may occur if the following warnings are
ignored.
•
This following portion of this section is intended for use by a QUALIFIED
ELECTRICIAN.
•
All circuit breakers must be turned off at the main panel before the cover of the unit
is removed.
This troubleshooting section will cover all the points that need to be checked from an
electrical standpoint to ensure that the Hubbell tankless booster heater is working correctly
and to determine which component may need to be replaced.
Tools Required:
•
Phillips screwdriver
•
Clamp multi-meter able to read voltage and amperage (amperage readings require a
clamp type meter).
•
Thermometer
Pre-Operational Procedures:
1. With power to the unit turned ON, verify that the configuration settings are correct in
accordance with the Temperature Controller User Interface Instructions in Section IV.
2. TURN OFF POWER AT THE MAIN PANEL.
3. Remove the cover by unscrewing the screws located on all sides of the unit.
4. Verify that the main power feed is properly connected to the power distribution block
or magnetic contactor, as applicable.
5. Verify all connections are tight.
Check the Power Supply to the Unit:
1. Turn on power to the unit from the main panel.
2. Check the incoming voltage between each phase at the line side of the power
distribution block or magnetic contactor, as applicable.
3. If no voltage is present between all phases, verify that the breakers or disconnect on
the main panel have been turned on.
4. If the breakers are on and there is still no voltage present or if the incorrect voltage or
no voltage is present between any two phases, contact an electrician to troubleshoot
the feed.
5. If all voltage readings are acceptable, proceed to Check the Transformer.
Check the Transformer:
1. The transformer is utilized on units with supply voltages above 240 volts to supply a
reduced voltage capable of powering the temperature controller.
2. If the display is lit or the unit is not equipped with a transformer (208 and 240 volt
units), proceed to Check the Hi-Limit Thermostats.
3. Check the voltage on the primary side of the transformer.
4. If there is no voltage present, check the wiring and connections to the primary side of
the transformer from the power distribution block or magnetic contactor, as
applicable.
5. Check the voltage on the secondary side of the transformer.
6. If the secondary voltage does not conform to the table below, replace the transformer.
7. If all voltage readings are acceptable, proceed to Check the Hi-Limit Thermostats.