7
USER Section
(en)
7703471.01 (1-03/18)
4. CENTRAL HEATING SYSTEM PRESSURE
Regularly check that the pressure displayed on the pressure gauge "
B
" is between 14.50
and 21.76 psi (1.0 - 1.5 bar), with the boiler cold. If the pressure is too low, turn tap "
A
" to
fill the boiler (figure to side).
A
Boiler/system filling tap
B
Pressure gauge
IMPORTANT INFORMATION
Take special care when filling the heating system. In particular, open any thermostat
valves in the system, ensure the water enters slowly in order to prevent the formation
of air inside the primary circuit until operating pressure is reached. Lastly, vent any
radiators in the system. BAXI declines all liability for damage deriving from the
presence of air bubbles in the primary exchanger due to the incorrect or imprecise
observance of the above.
WARNING
The boiler is fitted with a hydraulic pressure gauge which prevents the boiler from working if there is no water.
IMPORTANT INFORMATION
If pressure drops occur frequently, have the boiler checked by the AUTHORIZED SERVICE TECHNICIAN.
The water pressure in the central heating system is indicated by the pressure gauge.
With the system cold and the boiler not operating the pressure should be between 14.51 and 21.77 psi (1.0 and 1.5 bar). During
operation the pressure should not exceed 30.00 psi (2.11 bar) (See section 2: "USER CONTROLS").
A pressure of 30.00 psi (2.11 bar) or greater indicates a fault. The safety pressure relief valve will operate, at a pressure of 30.00
psi (2.11 bar).
It is important that your Service Engineer is contacted as soon as possible.
The MINIMUM pressure for correct operation is 7.26 psi (0.50 bar). If the pressure falls below 7.26 psi (0.50 bar), this may indicate
a leak on the central heating system.
The system must be re-pressurised by your Service Engineer.
5. SHUTTING OFF THE BOILER
To turn off the boiler, disconnect the electric power supply. In the “Off” operating mode ( ) the boiler stays off but the electrical
circuits remain powered and the frost protection function remains active.
6. FROST PROTECTION MODE
Do not drain the whole system as filling up with water again could cause unnecessary and harmful scale to build up inside the
boiler and the heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add some
specific antifreeze to the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors). The electronic
boiler management system includes a “frost protection” function for the heating system which, when delivery temperature falls
below 41°F (5°C), lights the burner until a delivery temperature of 86°F (30°C) is reached.
IMPORTANT INFORMATION
The function is operative if the boiler is electrically powered, there is gas, system pressure is normal and the boiler
flue is not blocked.
CAUTION
Never use automotive or standard glycol antifreeze, or even ethylene glycol made for hydronic systems. Use only
inhibited propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic
and can attack gaskets and seals used in hydronic systems. Ensure that the glycol used never exceeds 35% of the
systems volume as this may damage the systems components.
Consider piping and installation when determining boiler location. Any claims for damage or shortage in shipment
must be filed immediately against the transportation company by the consignee.