18
Linea
Once the burner pressure has been checked,
close the DHW outlet, isolate the appliance from
the electrical supply, remove the manometer, and
tighten the gas valve outlet test nipple.
5.8 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 ad-
ministered in strict accordance with the manufac-
turers instructions.
*Both Sentinel and Fernox manufacture products
that have proved suitable for use with Vokera ap-
pliances. Vokera Ltd. cannot comment on the
suitability of any other such product with our ap-
pliances.
5.8.1 INHIBITORS
See Section 3 “general requirements”
5.9 SETTING THE BOILER OPERATING TEM-
PERATURE
The flow outlet temperature can be adjusted be-
tween 40°C - 80°C via the Heating thermostat
knob (see fig.1).
5.9.1 SETTING THE DOMESTIC HOT WATER TEM-
PERATURE
The DHW outlet temperature can be adjusted be-
tween 40°C - 65°C via the Hot Water thermostat
knob (see fig.1).
5.10 SETTING THE SYSTEM DESIGN PRESSURE
The design pressure should be a minimum of 1
BAR and a maximum of 1.5 BAR.
The actual reading should ideally be 1BAR plus
the equivalent 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, pull lever on head of safety valve to re-
lease water until the required figure registers on
the pressure gauge (see fig. 1).
5.11 REGULATING THE HOT WATER
The appliance is fitted with a flow rate restrictor
that limits the maximum flow rate that can be
drawn through the appliance.
Linea 726
8-litre 9-litre 10-litre
(White) (Orange) (Blue)
Spare Fitted Spare
Linea 730
9-litre 10-litre 11-litre
(Orange) (Blue) (Beige)
Spare Fitted Spare
Linea 735
11-litre 12-litre 13-litre
(Beige) (Red) (Olive)
Spare Fitted Spare
The restrictor eliminates the need to manually ad-
just the DHW flow rate. However if it is felt nec-
essary to further increase or decrease the avail-
able 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 above denote the size of
restrictor fitted and the spare restrictors supplied
in the accessory pack. Each restrictor is colour-
coded to enable identification.
5.11.1 CHANGING THE FLOW RESTRICTOR
Refer to 6.19 for detailed instruction on changing
the flow restrictor.
5.11.2 REGULATING THE CENTRAL HEATING SYS-
TEM
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.
Compensator
tube
Protective
cap
Outlet
test-point
Inlet
test-point
Fig. 19
(40 pages)
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