Section 9 – Operation
International Thermal Reseach 9-7
The parts inside the heater are HOT when in operation. Use
gloves when adjusting the mixing valve.
Turning the mixing valve knob clockwise will decrease the hot
water outlet temperature and turning the knob counter-
clockwise will increase the temperature.
9.10 Stopping the Heater (for
Maintenance)
To shut down the heater totally, for maintenance purposes:
1.
Turn OFF, the service switch on the electronic control box.
2.
Wait until the heater has completed the purge cycle and turned
OFF.
3.
Disconnect the power supply.
9.11 Resetting a Fault
When a fault occurs and has been identified and corrected, the
system can be reset by switching the service switch on the side of
the main control box or the remote control switch OFF, then ON
again. This will reset the fault and the diagnostic code.
Note: Component faults can only be reset using the service switch.
9.12 Electrical Noise
Noise is an unwanted electrical signal, which produces undesirable
effects in the electronic circuits of the control system and we must
be aware of techniques to minimize the electrical noise on these
controllers. The majority of problems stem from crude wiring
practices and techniques, which allow "coupling" or the transfer of
electrical noise into the control circuit from the noise source.
A common symptom is the system behaves erratically, that is,
evidence of a problem does not appear consistently. Even worse, it
may give several different indications of a problem. Low power level
controllers that use electronic logic, especially those using
integrated circuits, are more sensitive to noise. A typical noise
source is any piece of equipment that can cause or produce very
rapid or large amplitude changes in voltage or current when turned
ON and OFF. A single side band transmitter is an example of this
type of equipment.
WARNING
