andrews R18 Series, Technical Documentation Manual

Page: 43 / 71

18IP22B
35
Fig. 25 Connection tray
6.2 Pre-lighting checks The following is a list of appliance checks to be carried out.
and dry run
6.2.1 Check 1 With the water heater gas inlet service cock closed and
6.2.2 Check 2 With the water heater gas inlet service cock closed, electri-
III) Check the setting of the modulating combustion air damp-
electricity supply switched off
I) Ascertain from the gas supplier or the customer that the
meter installation is operational.
II) Ensure that the gas installation pipework up to and includ-
ing the gas inlet service cock has been tested for gas
soundness in accordance with IM/5 or BS 6891 as appro-
priate.
III) Ensure that the gas installation pipework to the gas inlet
service cock has been purged in accordance with IM/2 or
BS 6891 as appropriate.
IV) Check that all electrical supplies are isolated
V) Check electrical earth continuity between the water heater
gas pipework and the mains supply.
VI) Check the electrical components are of the correct voltage
range, particularly low voltage ancillary controls.
VII) Check the pump motor current and adjust the starter
overload settings.
VIII) Fill and vent the water system and check for leaks.
cal supply switched on but on/off switch on water heater
control panel switched off
I) Check that the direction of rotation of the pump(s) is cor-
rect.
II) Check the correct operation of the water flow switch.
Components within the connection tray
(Remove cover from electrical connection tray)
er situated underneath the burners, there should be a gap
of 8 mm with the damper in the fully closed position
against the stops for Natural Gas (11 mm for L.P.G.) See
tables 15a and 15b.