31
10. COMMISSIONING
10.1 Initial lighting
1. Check that the electric power to the boiler is
switched off.
2. Remove the front panel and the two side panels.
3. Check that the gas supply is correctly fitted.
4. Check that the electrical connections are correct.
5. Open the cap of the automatic air vent
(fig. 6, no 10).
6. Fill the boiler and the installation with water and
check the water pressure (recommended 1.5 bar).
7. Only remeha W40-m ECO: Check the pump; this
may be stuck. If necessary, release with a screwdriver.
8. If necessary, vent the heat exchanger; the manual air
vent is mounted inside the air box
(fig. 06, no. 14).
Only remeha W40-m ECO: Also remember the built-in
circulation pump. This should be vented separately.
9. Vent the installation.
10. Fill the siphon with water.
11. Check the flue and the air inlet ducting.
12. Open the gas cock and vent the piping.
13. Switch the electric power switch on ('1').
14. Set the room thermostat or external boiler controls to
call for heat or over-ride.
15. Switch on the boiler burner switch ('1').
16. The following run sequence will show in the 'code'-
display:
5 = Check air transport: after checking the air
pressure switch in rest mode, the fan will turn,
and the appliance will wait until air transport is
sufficient, or until the three-way valve has been
bypassed, in the event of heat demand.
1 = Pre-ventilation: 0.3 seconds (post-ventilation:
following operation of the appliance, post-
ventilation will be carried out for 10 seconds).
2 = Ignition: for 2.4 seconds ignition will be
switched on and the gas valve opened, thus
igniting the burner.
3 = Appliance in central heating operation.
4 = Appliance in boiler operation; the three-way
valve to the boiler or the boiler pump has been
activated.
The following operating situations are now possible:
16a.Modulating operation:
The appliance will modulate at the flow temperature
requested by the modulating regulator (see also
'Note' under 16c).
16b.High/low operation: The appliance is operating at
part-load or full-load depending on the heat
demand.
16c.On/off operation: The appliance will modulate
between minimum and maximum load on the basis
of the flow temperature preset on the appliance.
Note:
Except immediately after the power has been
switched on and if the appliance has had no heat
demand for more than 2 hours, the appliance will
first burn at forced part-load. The factory setting for
forced part-load time is 0 minutes. This setting is
correct if use is made of modulating regulators (see
16a). For on/off operation, a forced part-load time of
3 minutes is recommended (setting mode, step G,
see para. 6.4.1 and 6.4.3).
16d.D.H.W. operation: The warm water production takes
precedence. The appliance modulates on the basis
of a preset flow temperature (setting range 70 to
90°C).
17a.Check the boiler for correct function in full load and
part load.
The best way to check whether the gas/air ratio
con-trol is functioning correctly, is to measure O
2
in
the flue gas discharge pipe P7, see fig. 20 (CO
2
measuring based on O
2
measurement is also possi-
ble). Direct measurement of CO
2
can lead to devia-
tion of the reading due to mixing CO
2
in the natural
gas.
Proceed as follows:
Connect the measurement equipment (check for air
tight).
17b.Run appliance at full-load (forced mode ‘HIGH’
paragraph 6.4.5).
- Press 'mode'and '
▲
' keys simultaneously.
Fig. 20 Measurement points
