andrews Fastflo WHC56 Service Manual page 6

Explanation of operation
1.Using hot water
(1) Turn the ON/OFF
turn on the light.)
(2) Open the hot water valve to be used. If the water flow sensor detects a water flow above the mini-
mum operation water flow volume, pre-purge(purging gas remaining in the combustion chamber
before ignition) will be carried out for a fixed duration of time. After this the gas solenoid valve will
open, the ignition device will activate, and ignition will take place in the burner. (The bypass flow
control valve is always waiting in the normally "open" position.)
(3) When the flame rod(flame sensor) detects a flame, the ignition device will stop sparking.
(4) The hot water temperature will automatically be adjusted to the temperature selected with the temp.
button.
(5) Close the hot water valve that was used.
(6) When the water flow sensor detects a water flow below the minimum operation water flow, the gas
solenoid valve will close and the flame will go out. Post-purge(purging gas remaining in the com-
bustion chamber after the flame goes out) will be carried out for a fixed duration of time, and then
the unit will stop.
(7) After using, the ON/OFF
(The ON/OFF
2. Error Codes
If by any chance the flame rod does not detect a flame or the high limit switch activates, the gas sole-
noid valve will close and extinguish the flame.
The display will show an error message to inform you of safe operation.
The safe operation reset procedure is to press the ON/OFF
press it again to turn it ON.
3. Miscellaneous
Before going to bed or at other times when the unit will not be used for a prolonged period of time, be
sure to press the ON/OFF
gone off, and then close the primary gas solenoid valve.
button on the remote controller to ON.(The ON/OFF
button on the remote controller should be turn OFF.
button will turn off the light.)
button on the remote controllers, make sure that the display has
button so it turns OFF, and then
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button will