Table of Contents
Advertisement
IMPORTANT
It's imperative that a sufficient dynamic – gas –
pressure is maintained at all times. Should the
dynamic gas pressure fall below an acceptable
level, the appliance may malfunction or sustain
damage.
5.8
FINAL FLUSHING OF THE HEATING SYSTEM
The system shall be flushed in accordance with
BS 7593. Should a cleanser be used, it must be
suitable for Aluminium heat exchangers. It shall
be from a reputable manufacturer and shall be
administered in strict accordance with the
manufacturers' instructions and the DWTA code
of practice.
NOTE
Chemicals used to cleanse the system and/or
inhibit corrosion must be pH neutral, i.e. they
should ensure that the level of the pH in the system
water remains neutral. Premature failure of certain
components can occur if the level of pH in the
system water is out-with normal levels.
5.8.1
INHIBITORS
See Section 3 "General Requirements".
5.9
SETTING THE FLOW OUTLET TEMPERATURE
The flow outlet temperature can be adjusted be-
tween 40 °C - 80 °C for standard CH system and
between 20 °C - 45 °C for under-floor systems by
using the Heating thermostat knob (see fig.1).
5.9.1
SETTING THE DHW OUTLET TEMPERATURE
The DHW outlet temperature can be adjusted
between 35 °C - 60 °C via the DHW thermostat
knob (see fig.1).
5.10
SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 0.5
BAR and a maximum of 1.5 BAR. The actual
reading should ideally be 1 BAR plus the equiva-
lent height in metres (0.1 BAR = 1 metre) to the
highest point in the system above the base of the
appliance (up to the maximum of 1.5 BAR total).
N.B. The safety valve is set to lift at 3 BAR/30
metres/45 psig. To lower the system pressure to
the required value, drain off some water from the
appliance drain valve until the required figure
registers on the pressure gauge (see fig. 1).
5.11
REGULATING THE CENTRAL HEATING SYSTEM
Fully open all radiator and circuit valves and run
the appliance for both heating and hot water until
heated water is circulating. If conditions are warm
remove any thermostatic heads. Adjust radiator
return valves and any branch circuit return valves
until the individual return temperatures are cor-
rect and are approximately equal.
5.11.1 REGULATING THE DHW FLOW-RATE
The appliance is fitted with a flow rate restrictor
that limits the maximum flow rate that can be drawn
through the appliance.
The restrictor eliminates the need to manually
adjust the DHW flow rate. However if it is felt
necessary to further increase or decrease the
available flow rate, spare restrictors are included
in the accessory pack.
The spare flow rate restrictors can be fitted to
either increase or decrease the maximum flow
rate. The tables overleaf denote the size of restrictor
fitted and the spare restrictors supplied in the
accessory pack. Each restrictor is colour-coded
to enable identification.
5.11.2 CHANGING THE FLOW-RATE RESTRICTOR
Refer to 6.27 for detailed instruction on changing
the flow restrictor.
Procombi A28
9-litres
10-litres
(Orange)
(Blue)
Spare
Fitted
Procombi A32
11-litres
12-litres
(Beige)
(Red)
Spare
Fitted
Procombi A36
13-litres
14-litres
(Olive)
Spare
Fitted
5.12
FINAL CHECKS
• ENSURE ALL TEST NIPPLES ON THE APPLI-
ANCE GAS VALVE ARE TIGHT AND 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 BENCHMARK CHECKLIST.
Complete details of the boiler, controls, installa-
tion and commissioning in the Benchmark check-
list at the back of this book. It is important that
the Benchmark checklist is correctly completed
and handed to the user. Failure to install and com-
mission the appliance to the manufacturers in-
structions may invalidate the warranty.
5.13
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 any associated
controls correctly.
Show the user the location 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 serv-
iced annually by a competent person.
11-litres
(Beige)
Spare
13-litres
(Olive)
Spare
15-litres
spare
13
Hide quick links:
Advertisement
Table of Contents
