Check Neutralization Unit (If Applicable); Check Diaphragm Expansion Tank And System Pressure - Viessmann VITODENS 200-W Service Instructions Manual

Vitodens 200-W B2HA 112, 150 Service
Check Neutralization Unit

Check Diaphragm Expansion Tank and System Pressure

(if applicable)
1. Check the pH value of the condensate with pH
measuring strip. If the pH value is less than 6.5,
replace granulate.
2. If contaminated:
Rinse neutralization unit with tap water.
3. Add granulate as marked.
IMPORTANT
pH measuring strip must be field supplied.
IMPORTANT
The granulate is consumed as it neutralizes the
condensate. The red marking indicates the minimum
filling level.
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
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
4. When starting up the system for the first time,
mark this value as the minimum filling pressure on
the manometer.
Note: A lower manometer reading usually indicates
Start-up and Service
Refer to Installation Instructions
Neutralization Unit (if applicable)
between boiler and topmost heat emitter
surface) corresponds to a static pressure of
1 bar (15 psig).
be approximately 3 psig higher than the static
pressure.
Maximum operating pressure: 80 psig
Minimum operating pressure: 14 psig
loss of water due to leakage. All leaks must
be repaired.
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