Vent-Axia LoWatt HR204 User, installation & servicing instructions - page 18
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9.2
Balancing the system
It is important that a suitable anemometer
is used to balance the system to give the
required ventilation rates to each room.
1. Set the appliance running on normal speed.
2. Make a preliminary adjustment of all the duct
inlet and outlet louvres.
Note: The supply air terminal is directional
and incorporates a deflector plate. Ensure
that the deflector plate is correctly
positioned so that the active part of the
terminal is discharging to the room.
3. Check the flow rate and adjust if necessary
the extract valve furthest from the appliance.
4. Check the flow rates and adjust if necessary
the remaining extract valves.
5. Repeat the flow checks and adjust until the
extract system is balanced.
6. Check the flow rate and adjust if necessary
the inlet valve furthest from the appliance.
7. Check the flow rate and adjust if necessary
the remaining inlet valves.
8. Repeat the checks and adjust until the system
is correctly balanced.
Note: If the flow rates have been achieved
with all the louvres nearly closed, it may
be possible to reduce the fan speed and
re-adjust the louvre settings.
9.3
Instruct the user
Instruct the user in the operation of the
appliance. Hand over these instructions, giving
advice on the necessity for regular servicing of
the filters and heat exchanger.
SV100
Adjust ceiling supply valve for living room etc.
EV100
Adjust ceiling extract valve for bathroom etc
Inside view of
extract valve
Locking nut
to lock
the valve
in position
Inside view of
supply valve
Locking nut
to lock
the valve
in position
Air direction
Air deflector
plate
Air
direction
indicator
Fig. 16
9.0 Commissioning
9.1
Prepare for commissioning
1. Refit the front cover by hooking it over the
top lip of the appliance and swinging down.
Tighten the two case screws.
2. Check the external controls are set to normal
running.
3. Turn on the electrical supply. The unit will now
start running at the normal ventilation speed.
4. Set the external control to boost. The unit will
now switch to boost speed.