gledhill BM125 Installation And Servicing Instructions page 30

2.3 COMMISSIONING
Important Do's and Don'ts
1. DO check the incoming mains water pressure and fl ow rate are adequate.
(The preferred range of mains pressure is 2-3bar).
2. DO check that all connections are in accordance with the labelling on the
thermal store.
3. DO adjust the ballvalve so that the water level in the F & E cistern when
the system is cold is correct and does not overfl ow when the whole of the
system is at maximum temperature.
4. DO make sure that there is adequate clearance above the F & E
cistern to service the ballvalve.
5. DO ensure that the range rated appliances are set at the highest output
and the boiler thermostat is set to maximum for all boilers.
6. DO ensure that the water level in the F & E cistern is at least 250mm above
the highest point on the radiator circuit or the highest point of the system.
7. DO insulate any exposed pipework in the BoilerMate cupboard.
8. DO plumb the overflow/warning pipe in a 20mm internal diameter pipe
material which is suitable for use with a heating F & E cistern, in accordance
with BS 5449 (such as copper) and ensure it has a continuous fall and
discharges in a conspicuous external position.
9. DO check the pump settings
a. The boiler pump should be set to give a temperature difference across
the boiler of 8°C or less.
b. The heating pump should be set to give a temperature difference across
the fl ow and return of not more than 11°C.
c. The hot water plate heat exchanger pump should be set at maximum.
10. DO ensure that the bypass valve for the heating system (if fitted) is set
correctly.
11. DON'T use a combined feed and vent on BoilerMate installations.
12. DON'T use a BoilerMate on a sealed primary i.e. closed system.
13. D O N ' T u s e p i p e s m a l l e r t h a n 2 8 m m between the boiler and the
BoilerMate when the boiler rating exceeds 20kW (about 68,000 Btu/h).
14. DON'T use dipped flow and return between the boiler and the BoilerMate
unless the boiler is fitted with an overheat thermostat. If necessary check
with the suppliers of the boiler.
15. DON'T operate the 'switch' backup facility until the system is fully fi tted, vented
and commissioned.
16. DON'T place any clothing or other combustible materials against or on top of
this appliance.
2.0 INSTALLATION
Page 30