35
ecoTEC plus 937 installation and maintenance manual
5
Commissioning, Part I
5.1
Preparatory checks of the electrical system
• Check the electrical installation for short circuits,
proper earthing and earth resistance and for correct
polarity.
5.2 Gas
supply
The entire gas installation including the gas meter must
be inspected, checked for leaks and purged in
accordance with BS 6891. In the Irish Republic (IE) in
accordance with the current version of IS 813.
• Purge the gas supply by opening the gas isolation
valve under the unit.
d
Danger!
Danger of explosions!
Provide adequate ventilation whilst doing the
work.
Extinguish all open flames and do not smoke
during purging.
• After purging re-tighten the gas isolation valve and
check for leaks. (The combi boiler itself does not need
to be purged.) This takes place through the automatic
burner ignition monitoring system.)
5.3
Cold water supply
• Open all the domestic hot water taps supplied by the
appliance.
• Open the mains water isolating valve supplying the
appliance.
• Open the cold water isolating valve under the
appliance. The water then flows through the combi
boiler and the shift load storage tank to the hot water
taps.
• Close all the hot water taps one after the other
starting with the lowest one until the hot water
pipework is vented.
• Check all hot and cold water pipes for leaks.
5.4
Filling the heating system
h
Note!
Use the following test programmes for filling
and venting the heating system:
Filling the heating system
• Use the test programme P6 for filling the heating
system:
The diverter valve moves to the central position, the
heating pump is not running and the unit does not go
into heating mode.
• Use the test programme as described in Section 8.2.
Vent the heating system
• Use the test programme P.0 to vent the combi boiler,
the heating system and the hot water circuit:
The unit does not go to heating mode, the heating pump
runs intermittently and alternately vents the heating
circuit and the hot water circuit. • Use the test
programme as described in Section 8.2.
5.4.1
Checking the filling pressure of the heating
system
bar
bar
1
2
Fig. 5.1 Checking the filling pressure of the heating system
h
Note!
The ecoTEC plus 937 is supplied fitted with a
pressure gauge and a digital pressure display.
Using the pressure gauge you can perform a
quick check whether the filling pressure is
within the prescribed range or not, even when
the unit is switched off.
With the unit switched on, you can read off the
exact pressure by pushing the button "-" (2).
For proper operation of the heating system, when the
installation is cold, the pointer on the pressure gauge (
1
)
should be in the dark-grey area. This corresponds to a
filling pressure between 1.0 and 2.0 bar. If the pointer is
in the light grey area, top up with water.
If the heating system extends over several storeys, the
system may require a higher filling pressure.
Commissioning, Part I 5
