VOKERA Mynute i20, User Instructions

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20
Fig. 26
Fig. 27
6.5 PUMP ASSEMBLY ( fi g. 26)
Carry out component removal procedure as described in 6.4.
Disconnect the fl ow pipe (B) from the combustion chamber
connection, slacken the pipe (C) at the hydraulic assembly
and swing/rotate clear of the pump assembly.
Remove the expansion pipe locking pin (D) from the top of the
pump assembly and withdraw the fl exible pipe. Locate and
remove the pressure gauge securing pin (Dx) and disconnect
the pressure gauge from the pump assembly. Disconnect the
electrical wiring from the pump’s electrical connection point (E).
Locate and remove the 2 securing screws (A) at the rear of the
pump assembly. Remove locking pin (F) from pump base and
lift pump assembly clear of the hydraulic manifold. The pump
assembly can now be removed from the appliance. Replace
carefully in the reverse order.
6.6 SAFETY VALVE ( fi g. 27)
Carry out component removal procedure as described in 6.4.
Disconnect the outlet pipe from the safety valve (
I
), remove
safety valve locking pin
(L)
from the hydraulic manifold. Replace
in the reverse order.
6.7 LOWER AUTOMATIC AIR RELEASE VALVE
( fi g. 26)
Carry out component removal procedure as described in 6.4.
Remove the expansion pipe locking pin
(D)
from the pump as-
sembly and remove the expansion pipe. Locate and remove
the AAV locking pin
(G)
from the pump assembly and remove
the AAV assembly
(H)
. Replace in the reverse order.
6.7.1 TOP AUTOMATIC AIR RELEASE VALVE ( fi g. 28)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front cover. Remove the
AAV locking pin (
M
) from the deaerator assembly and remove
the AAV assembly (
N
). Replace in the reverse order.
6.8 WATER PRESSURE SWITCH ( fi g. 29)
Carry out component removal procedure as described in 6.4.
Locate and remove the locking pin
(O)
from the water pres-
sure switch. Remove the wiring. Carefully withdraw the switch.
Replace in the reverse order.
6.9 FLOW THERMISTOR ( fi g. 3 - pos. 11)
Carry out component removal procedure as described in 6.4.
Unclip and remove the air chamber front cover. Unclip the fl ow
thermistor from the fl ow outlet pipe. Disconnect thermistor
electrical plug. Replace in the reverse order.
6.10 RETURN THERMISTOR ( fi g. 3 - pos. 8)
Carry out component removal procedure as described in 6.4.
Unclip the return thermistor from the return inlet pipe. Discon-
nect thermistor electrical plug. Replace in the reverse order.
6.11 PRINTED CIRCUIT BOARD ( fi g. 30)
Carry out component removal procedure as described in 6.4.
Pull the control fascia forward and lower it. Push the clips (
P
)
which secure the PCB cover, remove cover, after carefully tak-
ing note of all wiring connections and jumper tag confi guration.
Unhook and remove connection block (
Q
). Disconnect all wiring
from the PCB, locate and remove the PCB securing screws,
remove the required PCB. Replace in the reverse order ensur-
ing that the position of the 2 control knobs are correctly aligned
with the respective potentiometers on the PCB.
Ensure that the correct jumper tag confi guration has been
respected. It will be necessary to check the functioning of the
PCB is set for the correct boiler type/application.
D
x
H
D
G
F
C
E
A
B
Fig. 29
Fig. 28
L
N
M
O
Fig. 30
Q
P
I
K