Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 92 / 125

E09.012.246 Manual S-WG
93
12 COMMISSIONING THE WATER HEATER
12.1 First: flushing the water heater with water
After installation of the water heater the first step, before commissioning, is to flush the water heater and the
whole DHW installation with fresh water to remove pollution, debris and other materials that might cause a block-
ing. This must also be done with installations, where only the water heater is replaced.
12.2 Second: filling & venting the water heater and the system
After flushing the water heater and the installation the system can be filled with fresh water by opening the water
supply valve of the system and opening all the taps that are on the system. The water pressure of the system
should be between a minimum of 1 bar and a maximum of 10 bar, also depending on the applied pressure safety
valve.
The water heater has an automatic air vent situated on top of the water heater (at the roof panel). This vent must
be opened during the filling of the water heater and the DHW system to make sure that no air/oxygen is trapped
in the heat exchanger of the water heater. NOTICE: Check that the screw cap has been loosened at least one
twist.
Make sure that, during flushing and filling, no water can reach any electrical parts of the water heater.
12.3 Third: check the water flow
Before the water heater will be started, be sure that the pump is functioning and that there is a water flow over
the heat exchanger. Check the electrical power supply of the water heater. When this is connected correctly, the
display will show:
Display message B o i l e r o f f
Reason Water heater is not active. To activate the water heater press [ON/OFF]
button for 6 seconds.
Display message W A T R H T R : b o i l e r o f f
> > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C )
Reason Water heater is not active. To activate the water heater press [ON/OFF]
button for 6 seconds.
Activate the water heater by pressing the ON/OFF button for at least 6 seconds. After this the following display
will appear:
Display message W A T R H T R : N o d e m a n d
> > > : 1 2 3 . 4 ° C ( 1 2 3 . 4 ° C )
Reason Water heater is active, but there is no heat demand.
When there is no water present in the water heater or the water pressure is too low, the water heater will go into
lock-out and will show a corresponding message in the display.
Display message W a t e r p r e s s u r e f a u l t
9 9 9 , 5 h r s
Reason Water pressure is too low or too high.