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19
Linea Plus AG
6.6.10
Setting the Maximum Rate for Central
Heating
The maximum heat input for the central heat-
ing mode is not adjustable. When central
heating is selected the appliance will light at
75% of maximum heat input for a period of
approximately 15 minutes, whereupon the
appliance will burn at maximum rate. Should
the appliance reach temperature during the 15
minute period the burner will modulate further
to suit system load.
6.7
Checking the Flue System
6.7.1
The flue system should be visually checked
for soundness. Check all clamps and fixings
are secure and tight.
6.8
Checking the Heating Thermistor
6.8.1
Allow the system to warm up and manipulate
the c/h control knob to ensure that the burner
modulates between ‘high’ and ‘low’ and then
to ‘off’ and vice versa (scale range covers
approx. 45
°
- 85
°
C).
6.9
Regulating the Central Heating System
6.9.1
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.
6.9.2
If the burner will not light, ensure that water is
in fact circulating. See 4.6.3
6.9.3
Adjust radiator return valves and any branch
circuit return valves until the individual return
temperatures are correct and are approxi-
mately equal.
6.9.4
When all is adjusted, progressively close all
radiator valves to ensure that the appliance
still operates when flow through the system is
limited.
If the burner cuts out prematurely due to lack
of water pressure through the appliance, the
system should be regulated to ensure a flow
rate of at least 350 litres/h (78 gals/h). This
may mean the addition of a small manual by-
pass being fitted to the system if a fully TRV
system is used.
6.10
Final Flushing of the Heating System
6.10.1
The system should be flushed in accordance
with BS 7593: 1992.Turn on the boiler for
central heating and allow the boiler and sys-
tem to reach temperature. Turn off the boiler
and drain the system whilst still hot.
Refill the boiler and heating system as de-
scribed in 6.3.2.
Although not necessary for correct operation
of the boiler, an inhibitor may be added at this
point. Contact the inhibitor manufacturer for
further information concerning application and
dosage.
6.10.2
Inspect the system for soundness. Turn the
appliance off at the mode selector switch (fig.
1, 25).
6.11
Filling, Testing and Regulating the
Domestic Hot Water System
6.11.1
Start with the appliance switched on having
completed the procedures described in 6.4 to
6.10.
6.11.2
Open a domestic hot water tap (preferably the
bath tap).
Ensure cold water inlet stopcock is fully open
(vertically up) and the dhw control knob (24) is
set at maximum.
6.11.3
Set the adjustable stopcock to restrict the
maximum flow of water and achieve a tem-
perature rise acceptable to the end user.
6.11.4
The flow of water should activate the domestic
hot water flow switch (13) and drive the divert-
ing valve (16) to its hot water position thus
heating the domestic water flowing through
the dhw heat exchanger. At the same time the
pump and fan are activated lighting the burner
on maximum rate.
6.11.5
If the burner does not light, check that the
water flow rate is above the minimum re-
quired to operate the domestic hot water flow
switch (13) 2.0 litres/min (0.45 gals/min).
6.11.6
The temperature of the water will depend on
the rate at which it flows.
The temperature of water at the tap can be
varied by adjusting the water flow rate at the
tap up to the maximum predetermined
quantity.The hot water temperature control
knob (24) will govern the maximum tempera-
ture. When the appliance is being used in hot
water mode the temperature indicator (27)
indicates the temperature of the hot water
leaving the appliance.
6.11.7
It is best to set for the lowest acceptable
temperature since the user can gain higher
temperatures by restricting flow at the tap.
N.B. If the cold supply is subject to large
fluctuations or is above the permitted maxi-
mum a suitable pressure/flow regulator should
be fitted in the cold water supply to the
appliance.
6.11.8
Turn the appliance mode selector switch (25)
to the
position.
Slowly close the tap to reduce the rate of draw
to above the minimum approx. 2.0 litres/min.,
(0.45 gal/min.) Rotate the dhw control knob to
ensure the appliance modulates at its various
setting.
6.11.9
Close the draw-off tap still further. The burner
should stop when the rate falls below approxi-
mately 2.0 litres/min. (0.45 gal/min.).
6.11.10 The appliances incorporate a hot water preheat
facility. The appliance will therefore ignite pe-
riodically to maintain heat within the appliance.
