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3.1.5 Fixing the boundary temperature level of the outlet boiler water
The emergency opening of the servo-valve during exceeding of the boundary
temperature level of the boiler can be easily checked during boiler start-up. It can be carried
out when the mixed valve is not open yet, the working thermostat at a first burner stage is
fixed at its maximum level and the settled boundary level of the outlet boiler water is at its
minimal level. Mostly the boiler behavior is that if the working thermostat is switched off the
boiler temperature keeps increasing in case the heating water would not be leaded (for
example that could be happen at a closed mixed valve). When the boundary temperature level
of the heating water is reached the light indication 7 appears (see Figure 3a), the boiler must
be stopped, the mixed valve must be opened and the circulation pumps P1 and P2 must
operate, it is possible to start operation of the circulation pump in the domestic hot water
circuit in case the water tank temperature is less than 90
0
C. The boundary emergency boiler
water temperature can be adjusted from menu
„
SETTINGS” -> „Set limit Tk”
in the range of
(+90
0
C) – (+105
0
C).
The setting is to be done in a way that after activating the first
stage, the boiler would not be stopped by the working thermostat, neither to be able to
reach the assigned boundary level of the outlet boiler temperature. That means the
lowest possible temperature setting is of the 1
st
stage of the working thermostat (for
e80
0
C), the fixed emergency boiler temperature is higher (for e95
0
C)
and the emergency thermostat has the most possible settings (for in105
0
C). The
boiler emergency thermostat is an automatic discharger of hot water during overheating
of the boiler and operates together with an automatic filling valve with a cold water of
the water-conduit.
If the boiler temperature of the outlet boiler water drops bellow the fixed boundary
temperature level, the indication 7 stops and the Controller goes independently into the settled
operation mode with a control of the servo-valve.
Figure 8 shows the adjusting of the outlet emergency water temperature of the boiler
at:
a)
High temperature level
Tp
;
b)
Correct temperature level
Tp
,
where:
Tn is a temperature of the emergency boiler thermostat
Tb is a boiler temperature (in our case an emergency one)
Tp is a temperature of 1
st
stage of the working thermostat
3.1.6 Adjusting the assignation of the working thermostats for 1
st
and 2
nd
burner stage
About 1
st
stage
– from menu
„SETTINGS” -> „Thermostat st1”
is to be fixed an operation
temperature of 1
st
stage within
75 - 90 С;
Emergency boiler stopping
CONTROLLER safety
function
Without installed
controller
Тn
Тb
Тр
Тn
Тb
Тр
Т
t[min]
Т
t[min]
a)
b)
Figure 8
