Service manual

Chapter 3: FAULT FINDING
Burner state
stand-by
p
re-rinse/
p
re-heat
g
low
p
l
u
ignition in operation post-rinse pump afterrun stand-by
heat demand
fan
gas valve
glow plug
ionisation
pump
0 sec 3 sec 7 sec 12 sec 22 sec end of heat demand
0 sec 6 sec
Pump test program (each boiler start)
At each new heat demand the pump is switched, the pre-rinse starts, the glowplug pre-heats, and the static water pressure is measured.
After 3 seconds the pump is switched to high speed and the active water pressure is measured and stored in the software.
If the difference between the active water pressure and the static water pressure is between 0.05 and 0.54 bar (0.64 bar for type 40 and TWIN)
a correct water flow throu
g
h the
p
rimar
y
heat exchan
g
er is
p
resent and the i
g
nition time starts.
12 sec 22 sec
Temperature test (each boiler start)
After i
g
nition the water flow throu
g
h the heat exchan
g
er is secured b
y
a tem
p
erature test of flow / return sensor.
The temperature rise between flow sensor and return sensor must rise more than 3°C within 10 seconds.
If so the re
g
ulation is released.
12 sec end of heat demand
Pressure monitorin
g
(
durin
g
o
p
eration
)
If the system water pressure changes by more than ± 0.1 bar ( and ± 0,3 bar with changing pump speed) within 4 seconds, the regulation blocks
and switches over to the
p
um
p
test
p
ro
g
ram, with a continuous P on the status dis
p
la
y
.
12 sec end of heat demand
Pump speed regulation (high/low during heating operation)
When the temperature difference between flow and return is greater than 30°C, the pump switches to high speed.
When the tem
p
erature difference dro
p
s below 10°C, the
p
um
p
switches back to low s
p
eed.
Trouble shooting manual EN E000129004