Install Instructions

Boiler maintenance 11
51
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano G215 US oil/gas-fired boilers • Issue 2012/10
11.4 Checking the heating system
operating pressure
The system pressure for closed systems must be
12 – 30 psi (1 – 2.1 bar).
z Check system pressure
z If the pressure gauge shows less than 12 psi, the
pressure is too low. Top up with water.
z Add water through the feed valve.
z Vent heating system
z 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).
z Make sure that no persons are in the discharge area
of the pressure relief valve.
z 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.
Fig. 71 Pressure/temperature gauge for showing operating
pressure and feed temperature
CAUTION!
SYSTEM DAMAGE
due to frequent topping up.
If you need to add water frequently, the
heating system may be damaged by
corrosion and lime accumulation.
z Ensure that your heating system is bled
properly.
z Check the heating system for leaks and
proper operation of the expansion tank.
CAUTION!
SYSTEM DAMAGE
due to material stress as a result of
temperature differentials.
z Only fill the system when cold (the flow
temperature should be no more
than 100 °F).