VOKERA Compact - Page 32

30
Compact
7.12.6 FAULT FINDING TEST ‘C’: CHECK CONTROL IN C/H MODE
NO
YES
NO
YES
YES
NO
YES NO
REPLACE
CONTROL BOARD
REPLACE
CONTROL BOARD
REMOVE JUMPER
IS
TIMER JUMPER
ON
IS
VOLTAGE
ACROSS TERMINALS OF
MODULATOR COIL
>10 VDC
IS
VOLTAGE
ACROSS TERMINALS OF
MODULATOR COIL
< 8 VDC
CHECK BOILER
STARTUP TEST A
SET TIMER
JUMPER ON
DOES
BURNER
LIGHT
MADE A LINK BETWEEN
BLACK & BLACK WIRES AT
BOILER TERMINAL
STRIP AND CLOSE THE
TIMER CONTACT
SWITCH ON BOILER
AND SELECT MODE
TO WINTER C/H
THERMOSTAT AT
MAX.
START
RESTART THE
TEST
NO
NO
YES
REPLACE WIRE
AND
CONNECTIONS
REPLACE
CONTROL BOARD
REPLACE
MODULATOR COIL
IS THE
RESISTENCE OF
MODULATOR COIL
ABOUT 70/80
OHM
IS
THERE A
VOLTAGE <8 VDC
BETWEEN TERMINALS
CN9.3 & CN9.4
ON PCB
YES
C
IS
VOLTAGE
ACROSS TERMINALS OF
MODULATOR COIL
>10 VDC
SWITCH CH
THERMOSTAT AT MIN.
NO
YES
NO
WAIT TILL THE
VOLTAGE BETWEEN
TERMINAL CN9.3 & CN9.4
ON PCB IS < 1.2 Vdc
IS THE
VOLTAGE BETWEEN
TERMINAL CN9.3 &
CN9.4 ON PCB IS
< 1.2 Vdc
IS
TEMPERATURE
>80 ˚C
WAIT D.H.W.
TEMPERATURE
>80 ˚C
YES
NO
YES
NO
IS
C.H. NTC
OK
REPLACE
C.H. NTC
REPLACE
CONTROL BOARD
YES
D.H.W.