Vent-Axia LoWatt HR204 User, installation & servicing instructions - 1 3
N
L
1
2
1
2
3
4
5
6
7
8
Normal
Boost
1
2
3
4
5
4
5
6
ON
FRONT
UP
N
L
1
2
1
2
3
4
5
6
7
8
Normal
Boost
1
2
3
4
5
4
5
6
ON
20
11.0 Changing Components
11.3
Speed select & motor control PCBs
1. Remove the front cover by releasing the two
screws and lifting the cover up and forwards.
2. Remove the bottom electrical cover plate by
releasing the 3 screws, pulling the plate
forwards and disconnecting the earth lead to the
it. Make a note of the speed settings of the
dip switch and the wiring arrangement for the
PCBs.
3. Remove the two screw securing the PCB
chassis to the bulkhead. Pull the chassis
forward and down.
7. Re-assemble in reverse order. Make sure rear
tab of PCB chassis locates in slot. Check the
installation for earth continuity, short circuits,
resistance to earth and correct polarity
.
IMPORTANT: ISOLATE FROM THE
ELECTRICAL SUPPLY BEFORE STARTING
ANY WORK ON THE APPLIANCE.
Fig. 18
4. Make a note of the connections between
PCBs and motors.
5. Disconnect the motor cables, mains cable
and boost switch cable. Remove chassis and
PCBs completely.
6. Replace PCBs as necessary.
Remove electrical cover plate.
Example shown
Normal speed = speed 1
Boost speed = speed 4
11.1
Heat exchanger
1. Lift off the front cover by releasing the two
screws and lifting upwards.
2. Gently remove the heat exchanger by pulling
the strap forwards.
3. Re-assemble in reverse order taking care not
to damage the heat exchanger seals.
11.2
Heat exchanger seals
1. Remove the heat exchanger (see 11.1).
2. Remove the four heat exchanger seals taking
care to remove all the old adhesive backing.
3. Fit the new seals ensuring they make good
contact with the location channel.
4. Re-assemble in reverse order taking care not
to damage the heat exchanger seals.
FRO
NT
UP
Re-fit new
heat
exchanger
1 3
2
4
Fit 4 new
self-adhesive
sealing strips
(see positions
1 to 4 below)
Fig. 18
1
2
3
4
5
6
7
8
N
L
1
2
Normal
Boost
1
2
3
4
5
4
5
6
ON
THE FANS MAY CONTINUE TO ROTATE
FOR A MINUTE AFTERWARDS.