Transformer; Thermistor; Troubleshooting - Hayward H150 Installation, Operation And Service Manual

SECTION 6. QUALIFIED TECHNICIAN - MAINTENANCE/SERVICING
7. Remove pressure switch tube from header.
8. Loosen union nuts and detach pool plumbing from header.
9. Remove (12) nuts from the header.
10. Remove the header and header o-ring from the heat
exchanger.
To replace bypass valve parts:
11. The adapter/shaft assembly and spring are removed
by unscrewing the adapter as shown in Figure 54.
12. Remove the plastic bypass insert and valve disk from
header.
13. Replace parts with new plastic bypass insert, adapter, shaft,
spring, and plastic valve disk.
14. Inspect and ensure valve disk slides freely on the shaft. See
Figure 54.
15. Re-install by reversing above procedure.
To replace thermal control valve:
11. Remove plastic bypass insert from header.
12. Remove the thermal control valve from header.
13. Test the thermal control valve by placing it into a hot water
bath (above 108°F) and watching for movement that com-
presses the spring and opens the annular area in the center
of the valve. If this action does not take place, replace the
valve with a new one that has been tested as above. See
Figure 55.
14. Inspect and ensure valve disk slides freely on the shaft. See
Figure 54.
15. Re-install by reversing above procedure.
SECTION 7. TROUBLESHOOTING
General:
!
NOTE: These instructions are intended for the use of
qualified personnel trained and experienced in the installation
and servicing of this type of heating equipment and its related
system components. Some states may require installation and
service personnel to be licensed. Persons not qualified should
not attempt to repair this equipment according to these instruc-
tions.
!
WARNING: Never leave a jumper wire connected to keep
a heater running. A jumper wire should be used as a test device
only, as it is not a cure for a defective control.
34

Transformer:

(Electronic ignition only)
The transformer reduces the main power supply of 120V or
240V down to 20-26 volts. This is the voltage range in which the
heater operates.
To replace the transformer:
1. Turn pump, main gas valve, system switch and main
power off.
2. Remove two screws and open front control panel
3. Disconnect two slip-on terminal wires from the transformer.
4. Detach main power wires from transformer.
5. Remove the screws securing transformer to the mounting
bracket and remove the transformer.
6. Replace the transformer and reverse the above procedures.
Rewire according to the wiring diagram on the heater.

Thermistor:

(Electronic ignition only)
The thermistor monitors the return water temperature.
To replace pressure thermistor:
1. Turn pump, main gas valve and heater power off.
2. Turn electricity off.
3. Drain heat exchanger of all water
4. Remove side access panels.
5. Disconnect thermistor leads from circuit board.
6. Unscrew the thermistor.
7. Replace the thermistor and reverse above procedures.
!
CAUTION: Never allow the main burner to operate more
than five seconds with the filter system shut off. Serious damage
to the heater will result. Anytime the heater bangs or knocks, it
indicates a water void or lack of water flow. Shut off heater im-
mediately if this occurs.
!
Wiring:
As a preliminary check, make sure that ail wire connections
are clean and tight and that all wiring conforms to the wiring
diagrams. See Figures 30 and 33.