Lochinvar HWHC 44-370 G CE Installation, Commissioning, User & Maintenance Instructions page 26

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When the water heater starts, it will run through the following steps:
1. The water temperature drops below the set temperature of (for example) 65°C. The
controller detects a heat demand and starts the operating cycle.
-
The icon is activated.
- The message HEAT DEMAND appears.
2. Once demand is registered, the fan is started to vent any gases that may be present.
This phase is called pre-purge and lasts about 15 seconds.
-
The icon is activated.
- The message PRE PURGE appears.
3. During the pre-purge, the pressure switch closes.
-
The icon is activated.
- The message PRESSURE SWITCH appears.
4. This is then followed by the (pre-)glow of the hot surface igniter.
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The icons and
-
The icon is activated.
5. After a number of seconds pre-glow, the gas control valve is opened and ignition
takes place.
-
The icon is activated.
- The message IGNITION appears.
6. After ignition, the flame is detected and the appliance will be running. This means
that actual heating has started:
-
The icon is dimmed.
-
The icon is activated.
- The message RUNNING appears.
are dimmed
User part