Technical data

MAINTENANCE AND SERVICING
Ed.06/2011 39
SECTION 5: MAINTENANCE AND SERVICING
In this section you can find a few maintenance suggestions and the instructions which are
necessary to technical assistants in order to adjust the gas valve and replace the gas.
5.1 HOW TO ADJUST THE GAS VALVE
For a correct operation of the F2 Series gas fired unit heaters it is necessary that the
calibration values of the gas valve are equal to those indicated in the table here below.
The appliance is sent from the factory with the gas valve already calibrated. If you need to
adjust the gas valve, proceed as described here below.
OFF-SET VALUES
F2 80
RATED OFF-SET (mbar)
(mmH
2
O)
-0,15
-1,5
MAXIMUM OFF-SET (mbar)
(mmH
2
O)
-0,09
-0,9
MINIMUM OFF-SET (mbar)
(mmH
2
O)
-0,25
-2,5
Table 8 – OFF-SET values
To Have: the heater installed and connected to the power and gas supply lines.
The gas valve adjustment must be performed by qualified personnel. To this
regard, ROBUR S.p.A. can dispose of a network of Assistance Centres which can
be reached through the point of sale, the local agent or by calling directly the
Customer Assistance of ROBUR S.p.A. (tel. [phone]).
1 - Connect a pressure gauge to the pressure connector A, after removing the relevant
fastening screw (see Figure 25 at page 40).
!
In case of use of a differential pressure gauge, you need to connect the pressure
connector A of the gas valve to the pressure gauge connector + (positive).
2 - Turn on the appliance and wait until the flame is stabilized (2 minutes
approximately).
3 - With door open, operate on the off-set adjusting screw C (see Figure 25 at page 40)
until the rated value specified in Table 8 is obtained.