Commissioning The Appliance; Final Checks; Frost Protection; Overheat Protection - Biasi RIVA OV M110.18SM/OV User Manual And Installation Instructions

5.2

Commissioning the Appliance

a) Slacken the screw in the appliance inlet
pressure test point and connect a suitable
manometer. Refer to Figure 23.
b) Check that the gas supply is turned ON and
the gas service cock is OPEN.
c) Switch on the electrical supply.
d) Turn the CH temperature Control knob to the
midpoint between
maximum setting. The display changes from
' ' to ' '.
e) Ensure programmer and room thermostat (if
fitted) are calling for heat.
f) The display changes to
start and after a few seconds an ignition will
commence.
g) If the burner fails to light the fan will stop.
Initially this may be due to air in the gas supply
line. The boiler will automatically have five
attempts at ignition. It may be necessary to
turn the CH Temperature Control knob fully
anti-clockwise to reset position and repeat
step (d). (See also section 5.4).
h) When the boiler has lit the display will show
'H.'. Allow the appliance to run for at least 10
minutes and check that the gas supply
pressure measured at the appliance inlet
pressure test point is 20 ± 1 mbar.
5.3

Final Checks

a) Turn off the appliance and remove the
manometer. Tighten the appliance inlet
pressure test point screw. Re-light the burner
and test for gas tightness.
b) Fit the appliance casing as illustrated in Figure
24. Position and secure both side panels and
the decorative front cover with screws at the
top and bottom.
c) Set the CH Temperature Control to the
required setting. Set the room thermostat (if
fitted) to the required setting. Refer to hot
water cylinder instructions.
If the boiler is connected to a hot water cylinder
the CH temperature has to be set to high.
5.4 Lockout/Reset Indication
In the event of failure during an ignition sequence,
(5 attempts) the LED displays fault code
order to reset the boiler turn the CH Temperature
Control anticlockwise to 'STANDBY' position and
then back to 'ON' within
the minimum and
'H'. The fan should
'3'. In
two seconds.
Fig 23. Inlet Pressure Test Point
5.5

Frost Protection

The appliance is fitted with a
device. In the event of very cold conditions, the
external pump may operate and the appliance
light for a few minutes to protect the appliance
and system from potential frost damage. This
can only function if the gas and electricity
supplies are maintained.
5.6

Overheat Protection

The appliance incorporates flow and
thermostats, which monitor the operating
temperature. Abnormal temperatures such as
overheating will cause the appliance to go to
lockout and the LED display will show code
Allow the appliance to cool and turn the CH
Temperature Control knob fully anti-clockwise to
the reset position to clear.
5.7

Other Features

The following additional
the appliance specification:
ANTI-CYCLE DEVICE:
When the appliance cycles on its central heating
control thermostat, a slow cycle device
operates. The timer (set to 5 minutes) is
activated after the end of each burn cycle to
prevent rapid cycling of the burner.
CH SOFT START DEVICE:
After every burner start the burner output stays
at low for 30 seconds, to ensure smooth heat up
of the system and maximum efficiency.
frost protection
return
'1'.
features are included in
23