Checking The Heating System Operating Pressure; Testing Relief Valve - Buderus Logano G215 US Installation And Maintenance Instructions Manual

Boiler maintenance
11.4 Checking the heating system
operating pressure
The system pressure for closed systems must be
12 – 30 psi (1 – 2.1 bar).
Check system pressure
If the pressure gauge shows less than 12 psi, the
pressure is too low. Top up with water.
SYSTEM DAMAGE
due to frequent topping up.
If you need to add water frequently, the
CAUTION!
heating system may be damaged by
corrosion and lime accumulation.
Ensure that your heating system is bled
properly.
Check the heating system for leaks and
proper operation of the expansion tank.
SYSTEM DAMAGE
due to material stress as a result of
temperature differentials.
CAUTION!
Only fill the system when cold (the flow
temperature should be no more
than 100 °F).
Add water through the feed valve.
Vent heating system
Check the pressure again.

11.5 Testing relief valve

The functioning of the pressure relief valve must be
checked at regular intervals (1-3 years as specified by
local codes).
Make sure that no persons are in the discharge area
of the pressure relief valve.
Raise the lever on the pressure relief valve.
The pressure relief valve must open and release
pressure. If the pressure relief valve does not discharge,
it must be replaced, because system components may
be damaged by excessive pressure.
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano G215 US oil/gas-fired boilers • Issue 11/2004
Fig. 71 Pressure/temperature gauge for showing operating
pressure and feed temperature
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