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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Checking the Expansion Tank (on site) and System Pressure
Checking the Safety Valve Function
Checking All Gas Equipment for Leaks at Operating Pressure
Fitting the Front Panel
See page 30.
Service
Ensure proper operation of low water cut-off(s)
(if applicable), pressure relief valve, and pump(s).
Check pressure gauge, air vent and pressure relief valve.
Ensure that pressure relief valve does not leak and that it
operates in accordance with information provided by the
original manufacturer.
Refer to maintenance instructions supplied
with low water cut-offs, pumps, etc.
Flush float water type low water cut-offs (if used).
Follow local regulations with respect to backflow preventers.
If oil-lubricated pumps are used, ensure proper lubrication.
If motorized zone valves are used, refer to maintenance
instructions provided with zone valves.
CAUTION
Ensure all joints of gas line are pressure tight and that
gas valves do not leak when under normal operating
pressure (use approved leak detection liquid). Do not
use open flame.
WARNING
The gas supply piping must be leak tested before placing
the boiler in operation.
3. Top up with water until filling pressure is higher than
the inlet pressure of the diaphragm expansion tank.
Note: With the system cold, the filling pressure must
be approximately 3 psig higher than the static
pressure.
B1HE/KE 85/120
Maximum operating pressure: ......................45 psig
Minimum operating pressure: .......................12 psig
B1HE/KE 150/199
Maximum operating pressure: ......................60 psig
Minimum operating pressure: .......................12 psig
4. When starting up the system for the first time,
mark this value as the minimum filling pressure on
the pressure gauge.
Note: A lower pressure gauge reading usually
indicates loss of water due to leakage.
All leaks must be repaired.
Perform check with the system cold.
1. Drain boiler/system and reduce pressure until the
manometer reading is “0”.
2. 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 approximately 60ºF (15.6ºC).
Note: Static head of 33 ft. (10 m) (distance between
boiler and topmost heat emitter surface) cor-
responds to a static pressure of
0.8 bar (12 psig).
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