VOKERA Hydra Installation & Servicing Instructions Manual - page 18
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5.1
GAS SUPPLY INSTALLATION
Inspect the entire installation including the gas
meter, test for soundness and purge.
5.2
THE HEATING SYSTEM
The appliance contains components that may
become damaged or rendered inoperable by oils
and/or debris that are residual from the installation
of the system, consequently it is essential that the
system be flushed in accordance with the following
instructions.
5.3
INITIAL FILLING OF THE SYSTEM
Ensure both flow and return service valves are
open, identify the automatic air release valve (fig.
12) and loosen the dust cap by turning the cap
anti-clockwise one full turn.
IMPORTANT, THERE ARE NO MANUAL AIR
RELEASE VALVES LOCATED ON THE
APPLIANCE. Ensure all manual air release valves
located on the heating system are closed.
Identify filling/inlet valve found at the base of the
appliance (fig. 6A). The filling loop may have
been disconnected from the filling/inlet valve and
heating flow valve. If so, reconnect unscrewing
the caps as necessary.
The filling/inlet valve has 3 positions (fig. 17):
- Vertically up - normal operating position
- Turn to the left to horizontal - closed position
- Vertically down - filling position
To fill, slowly turn the handle of the filling/inlet
valve from the closed position towards the filling
position. Mains water will be heard to enter the
system/boiler. As the water enters the system/
boiler the pressure gauge will be seen to rise.
Pressurise to between 1 bar & 1.5 bar when the
system is cold. DO NOT OVERPRESSURISE.
Once the desired pressure is achieved, turn the
filling/inlet valve back to the closed position.
Starting with the lowest radiator open each air
release tap in turn closing it only when clear
water, free of bubbles, flows out. In the same
away release air from any high points in the
pipework.
Continue filling the system until at least 1.0 bar
registers on the gauge then turn the handle of the
filling/inlet valve back to the closed position;
Inspect the system for water soundness and
remedy any leaks discovered.
5.4
INITIAL FLUSHING OF THE SYSTEM
The whole of the heating system must be flushed
both cold and hot as detailed in section 5.8. Open
all radiator or heating valves and the appliance
flow & return service valves. Drain the boiler and
system from the lowest points. Open the drain
valve full bore to remove any installation debris
from the boiler prior to lighting. Refill the boiler
and heating system as described in section 5.3.
5.4
FILLING THE HOT WATER SYSTEM
Close all hot water draw-off taps.
Turn filling/inlet valve to the normal operating
position (vertically up, fig. 17).
Slowly open each draw-off until clear water is
discharged.
5.6
PRE-OPERATION CHECKS
Before attempting the initial lighting of the appliance,
the following checks must be carried out:
●
ensure all gas service valves from the meter to
the appliance are open and the supply pipe has
been properly purged;
●
ensure the proper electrical checks have been
carried out, (see section 7.7) particularly
continuity, polarity, and resistance to earth;
●
ensure the 3 amp fuse – supplied with the
appliance – has been fitted;
●
ensure the system has been filled, vented and
the pressure set to 1 bar;
●
ensure the flue system has been fitted properly
and in accordance with the instructions;
●
ensure all appliance service valves are open.
5.7
INITIAL LIGHTING
Ensure the electrical supply to the appliance is
switched on. Switch the time clock or programmer
to an ‘on’ position and ensure all external controls
are also calling for heat.
The appliance will now operate in the pre-heat
mode as described in section 1.2. Once the pre-
heat function has been completed, the appliance
will operate in the central heating mode as
described in section 1.4. Should the appliance fail
to ignite, refer to section 5.6 and/or section 7
(faultfinding).
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
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.
5.8.1
INHIBITORS
See Section 3 “General Requirements”.
5.9
APPLIANCE OPERATING PARAMETERS
The appliance is supplied with pre-set operating
parameters. Parameters 1-4 (heating and hot
water settings) can be adjusted at any time,
SECTION 5 COMMISSIONING
normal
operating
position
filling
position
closed
position
Fig. 17