E93.1001EN.C Manual CD
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STARTING THE WATER HEATER
13.1
General
Check the gas pressure available at the gas connection pipe of the water heater. Use the pressure nipple (3) of
the gas safety valve for this measurement. The gas pressure for the water heater, to operate properly under the
correct load, must be at least 20 mbar.
The graphs below show the position of the pressure nipple (3) for the complete water heater range.
13.2
Firing for the first time
After the commissioning of the water heater and the described previous actions, the water heater display will show
the following graph.
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.
The display describes:
•
The actual operation
•
If a heat demand is activated
•
The temperature setting
•
The temperature measured
When mounting the bottom part of the siphon, before commissioning the water heater and/or after
maintenance, the siphon must
ALWAYS
be completely filled with water.
This is a safety measure: the water in the siphon keeps the flue gases from leaking out of the
heat exchanger via the condensate drain.
When the water heater receives a heat demand the electronics will start the operation of the water heater. Before
the water heater is used, the burner must be adjusted and set at the minimum and maximum load.
80 & 100
150 & 180
120
PIL
OT
9
-
I
IN
O
U
T
AIR
IN
EV2
EV1
PIL
OT
9
-
I
IN
O
U
T
AIR
IN
EV2
EV1
PIL
OT
9
-
I
IN
O
U
T
AIR
IN
EV2
EV1
P I
LO
T
9
-
I
IN
O
U
T
AI
R
IN
EV
2
EV
1
P I
LO
T
9
-
I
IN
O
U
T
AI
R
IN
EV
2
EV
1
3
1
2
3
1
2
3
1
2
4
1
1
4
The siphon must always be filled
with water to the edge before
placing back on the unit
