17
Compact
5.9
FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with
BS 7593. If a cleanser is to be used, it shall be
from a reputable manufacturer* and shall be
administered in strict accordance with the
manufacturers instructions.
*Both Sentinel and Fernox manufacture products
that have proved suitable for use with Vokera
appliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our
appliances.
5.9.1
INHIBITORS
See section 3 “General requirements”.
5.10
SETTING THE FLOW TEMPERATURE
The heating flow temperature selector can be
adjusted from a minimum of 40
°
C, to a maximum
of 82
°
C. In addition, when the selector is rotated
to the Auto position, the appliance will
automatically adjust the outlet flow temperature
to compensate for inclement weather
*When the selector is left within this range, the appliance will
automatically raise the outlet temperature during cold or
inclement weather conditions
5.11
SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be I minimum of 1
bar and a maximum of 1.5 bar.
The actual reading should ideally be 1 bar plus
the equivalent height in metres to the highest
point in the system above the base of the appli-
ance. (Up to the maximum of 1.5 bar total).
N.B. The safety valve is set to lift at 3 bar/ 30m/
45psig.
To lower the system pressure to the required
value, pull lever on head of safety valve to release
water until the required figure registers on the
pressure gauge (fig.1).
5.12
REGULATING THE CENTRAL HEATING SYS-
TEM
Fully open all radiator and circuit valves and run
the appliance in the central heating mode until
heated water is circulating. If conditions are warm
remove any thermostatic valve heads. Adjust
radiator return valves and any branch circuit
return valves until the individual return
temperatures are correct and are approximately
equal.
5.13
REGULATING THE DOMESTIC HOT WATER
The appliance is supplied with a built-in flow
restrictor that limits the amount of water passing
through the heat exchanger, thereby ensuring a
reasonable temperature at the outlet.
The outlet temperature can also be adjusted via
the DHW temperature selector.
If the required outlet temperature cannot be
obtained by rotating the DHW temperature
selector to its maximum setting, the adjustable
stopcock should be used to limit the available
flow rate at the outlet. Slowly turn the adjustable
stopcock clockwise until a satisfactory
temperature is obtained.
Please note that it’s prudent to set the domestic
hot water outlet temperature at the lowest
acceptable temperature, as higher temperatures
can be realised by reducing the flow rate at the
individual hot water outlets.
NOTE
The appliance will light to provide hot water when
the domestic hot water flow switch senses a flow
rate of 2.0 litres –per minute – or more.
5.14
FINAL CHECKS
●
ENSURE ALL TEST NIPPLES ON THE
APPLIANCE GAS VALVE ARE TIGHT AND
HAVE BEEN CHECKED FOR SOUNDNESS.
●
ENSURE THE APPLIANCE FLUE SYSTEM IS
FITTED CORRECTLY AND IS PROPERLY
SECURED.
●
ENSURE ALL PIPE WORK IS RE-CHECKED
FOR SOUNDNESS.
●
RE-FIT APPLIANCE CASING.
●
COMPLETE APPLIANCE LOGBOOK.
Complete details of the boiler, controls, installation,
and commissioning in the logbook supplied with
the boiler. This is an important document, which
must be correctly completed and handed to the
user. Failure to install and commission the
appliance to the manufacturers instructions may
invalidate the warranty.
5.15
INSTRUCTING THE USER
Hand over all documentation supplied with this
appliance – including these instructions – and
explain the importance of keeping them in a safe
place.
Explain to the user how to isolate the appliance
from the gas, water, and electricity supplies, and
the locations of all drain points.
Show the user how to operate the appliance and
Show the user the position of the filling valve and
how to top-up the system pressure correctly, and
show the location of all manual air release points.
Explain to the user how to turn off the appliance
for both long and short periods, and advise on the
necessary precautions to prevent frost damage.
Explain to the user that for continued safe and
efficient operation, the appliance must be serviced
annually by a competent person.
Sector
Range
Low sector
Auto sector
High sector
40
°
- 50
°
C
55
°
- 65
°
C*
65
°
- 82
°
C
Flow temperature selection