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Steps
(continued)
I
nitial start-up
C
A
Fig. 5
c System supply
D System return
CAUTION
Unsuitable fill water increases the
level of deposits and corrosion, and
may lead to damage to the
equipment.
H Thoroughly flush the entire heating
system prior to filling with water.
H Only use water of potable quality.
H The water will have have to be
softened if it is harder than 8.77
grains / 150 ppm total dissolved
solids.
H Inhibitors or antifreeze additives
suitable for heating systems may
be added manually.
3. Fill heating system with water
1. Open system isolation valves at C
and D (if installed).
2. Check inlet pressure of the
diaphragm expansion tank.
D
E
3. To remove debris and/or sludge
ensure that the system piping is
flushed out. Failure to do so could
cause settlement in the boiler
causing overheating and damage
not covered by warranty.
4. Fill the heating system with water
at the boiler filling tap E and drain
air completely from the drain tap
A.
5. If the control unit has not been
switched ON prior to filling the
system, switch the control to ON,
and activate the filling program by
setting coding address "2F" to "2"
(boiler pump sÖ starts and the
burner shuts down if this function
is enabled. The program is
automatically disabled after 20
minutes, and coding address "2F"
is set back to "0").
Initial Start-up and Service
Please note:
Before filling the heating system with
water, check that all necessary flow
check valves are installed.
If the nitrogen pressure of the
precharged expansion tank is less
than the static pressure of the
system, inflate membrane pressure to
slightly exceed pressure of system.
The static pressure required at the
tank is based upon the static height
of the system. The system fill
pressure value must be equal to the
expansion tank pressure value at
approx. 60ºF / 15.6ºC.
System fill pressure must be
approximately 3 psig higher than the
static head when the system is cold.
Water treatment should be
considered in areas where it is known
that boiler feed water contains a high
mineral content and hardness.
In areas where freezing might occur,
an antifreeze may be added to the
system water to protect the system.
Please adhere to the specifications
given by the antifreeze manufacturer.
Do not use automotive silicate-based
antifreeze. Please observe that an
antifreeze/water mixture may require
a backflow preventer within the
automatic water feed and influence
components such as diaphragm
expansion tanks, radiation, etc. A
40% antifreeze content will provide
freeze-up protection to -10°F /
-23°C. Do not use antifreeze other
than specifically made for hot water
heating systems. System also may
contain components which might be
negatively affected by antifreeze.
Check total system frequently when
filled with antifreeze.
Max. operating pressure...60 psig
Min. operating pressure...14 to 23 psig
Pressure relief valve......30 psig
11
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