13.8
Balance the system to give a temperature differential of
11°C or 13°C. A non-adjustable by-pass is fitted to the appliance.
Refer to Table 3.
13.10
Set the room thermostat to minimum and check that the
burner goes out.
Reset the room thermostat to maximum and the burner will re-
light and follow the normal operating procedure.
Turn off the gas service cock.
The burner will go out but sparking from the electrode will
continue for 10 seconds when the appliance will 'Lock-out'.
After 60 seconds
carefully
open the gas service cock.
Switch mains electricity off and on and observe the burner re-
light and follow the normal sequence of operation.
Turn off the gas service cock and electricity supply to the
appliance.
Drain the system while the appliance is hot.
Refill, vent and re-pressurise the system as described in Section
13.1 preceding, adding, if necessary, a suitable proprietary
inhibitor. Further information is available from Betz Dearborn,
0151 4209563 or Fernox 01799 550811.
13.11 Domestic Hot Water and Central heating
Set all controls to maximum.
Turn on the electricity supply to the appliance and open the gas
service cock at the appliance.
The burner will light and heat will pass into the system.
Turn on a hot tap and check that hot water is soon discharged
from the tap. Close the tap and the burner will go off.
The appliance will then return to the central heating mode and
automatically balance with the system requirements.
13.12 Completion of Commissioning
Disconnect the pressure gauge and tighten the test point screw.
Refit the cabinet.
If the appliance is to be passed over to the user immediately
then set the controls to the users requirements.
If the appliance is to be left inoperative in frosty conditions then
set the programmer, if fitted, to off.
Do not turn electricity or gas supplies off.
The appliance will operate under the control of the integral frost
protection facility.
If there is any possibility of the appliance being left totaly unused
in freezing conditions then switch off the gas and electricity
supplies and drain the appliance and system.
14.1
Tell the user how to operate the appliance and
hand over the Users Instructions leaflet.
14.2
Tell the user what to do if the heating system is not to be
used in frosty weather.
14.3
Tell the user the sealed system set pressure.
14.4
Tell the user of the importance of regular servicing.
Worcester Heat Systems Ltd. offer a comprehensive maintenance
contract.
14.5
Set the system controls to the user’s requirements.
14.6 Complete and hand over to the user the Benchmark
Log-Book.
14. Handover
20
Fig. 34. User controls.
1
4
2
3
1 Reset Button
2 Mains Indicator
3 C.H. Temperature Control
4 System Pressure Gauge
