State Water Heaters SCE 65-400, Installation, User And Service Manual

Page: 14 / 72

Operating the appliance
14 Instruction Manual SCE
2
gis
2.2 General operation of
the appliance
Figure 2.1 shows a cross-section of the appliance.
For this appliance the cold water is fed into the bottom of the tank via the cold
water inlet
z
. The combustion heat is transferred to the water through the
combustion chamber
j
and flue tubes
d
. The heated tap water leaves the tank
from the hot water outlet
o
. Once the appliance is completely full of water, it is
constantly under water supply pressure. When draining hot water from the
appliance, it is immediately topped up with cold water.
The gas that is needed for combustion flows via the gas control
l
into the
manifold. Injectors are located in the manifold. The gas is injected via these
injectors into the bar burners
C
. Together the bar burners constitute the burner
tray. Whilst the gas is being injected into the bar burners, the primary air that is
needed for combustion is also sucked in
(1)
. Air is also sucked in through the
openings in the burner tray. The glow igniter
A
is responsible for igniting the
gas-/air mixture. The flue gases released during combustion here are drawn
Legend
a
flue gas outlet
b
draught diverter
c
anodes
d
flue tubes
e
flue baffles
f
PU insulation layer
g
tank
h
cleaning opening
i
drain valve
j
combustion chamber
k
radiation shield/condensation
tray
l
gas control
m
flue gas thermostat sensor
n
flue gas thermostat
o
hot water outlet
p
safety thermostat sensor
q
maximum thermostat sensor
r
control panel
s
control thermostat
t
burner controller
u
maximum thermostat
v
frost thermostat
w
safety thermostat
x
control thermostat sensor
y
frost thermostat sensor
z
cold water inlet
A
glow igniter
B
ionization pin
C
bar burners/burner tray
Figure 2.1 Cross-section of the appliance
IMD-0143
m
n
o
p
u
x
z
A
C
q
t
w
r
s
v
y
B
a
c
d
e
f
h
i
j
k
g
b
l