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21.0 PUTTING THE WATER HEATER OUT OF OPERATION
It is recommended to have the water heater operational all year round to prevent any frost damage during the winter and/or rotating parts
getting jammed during other times of the year (built in water heater safety features).
OUT OF OPERATION: On/off function.
To be used when the appliance must be put out of operation for a long period because of a defect or another safety risk.
Act as follows:
Disconnect or switch off the tank thermostat and/or other external controllers from the water heater. The pump and fan will stop after
a short time.
Switch off the water heater by pressing the [ON/OFF] button for six seconds.
Make sure the following display screen is visible.
Display message
Properties of the 'off' function:
The keys do NOT respond and the menu is NOT accessible.
The burner does NOT respond to an external heat demand.
The water heater CAN, however, be switched on again by pressing the [ON/OFF] button.
Pump(s), fan(s) and cascade (if applicable) are operational, and so are both recirculation protection (if applicable) and frost protection.
To reactivate the water heater, switch on the burner by pressing [ON/OFF] for six seconds again.
The frost protection module can still activate the burner(s).
To prevent this, switch off this protection or put the water heater in 'power off' mode.
OUT OF OPERATION: Power off.
To assure that the water heater cannot become active at all anymore, power should be cut off completely.
Act as follows:
Disconnect or switch off the tank thermostat and/or other external controllers from the water heater. The pump and fan will stop after
a short time.
Switch off the water heater by pressing the [ON/OFF] button for six seconds.
Make sure the following display screen is visible.
Display message
Switch off the electrical power supply of the water heater (remove connection from the wall socket, or switch off the main power).
Close the gas valve / gas supply.
In case of possible frost damage: drain both the water heater and the DHW system.
NOTICE: Before starting to drain the water heater, first start draining the DHW system and subsequently open also the two drains of
the water heater.
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