Technical data

Linea 24 & 28
37
IS
VOLTAGE
ACROSS
TERMINALS OF
MODULATOR
COIL >
10 VDC
REPLACE GAS
VALVE
COMPLETE
REPLACE WIRE
AND
CONNECTIONS
REPLACE
CONTROL
BOARD
REPLACE GAS
VALVE
COMPLETE
IS
THERE A
VOLTAGE >10 VDC
BETWEEN TERMINALS OF
MODULATOR
COIL
IS THE
RESISTENCE
OF MODULATOR COIL
APPROX. 40
OHM
IS
THERE A
VOLTAGE >10 VDC
BETWEEN TERMINALS
M4.1 & M4.2
ON PCB
DOES
BURNER LIGHT
CHECK BOILER
STARTUP:
TEST A
TURN ON TAP
TURN MODE
SELECTOR SWITCH TO
H/W POSITION AND
H/W THERMOSTAT TO
MAXIMUM
START
TEST B : CHECK CONTROL
IN DHW MODE
LINEA 24 / 28
TURN DHW
THERMOSTAT TO
MIN.
DO BURNER
AND
FAN SWITCH OFF
IS
WATER FLOW
TEMPERATURE
>40 *˚C
WAIT FOR WATER
FLOW
TEMPERATURE TO
BE
>40 ˚C
REPLACE PCB
SWITCH DHW
THERMOSTAT TO
MAX.
DO BURNER
AND FAN
SWITCH ON
IS
WATER FLOW
TEMPERATURE
>80 *˚C
WAIT FOR WATER
FLOW
TEMPERATURE
TO BE < 80˚C
REPLACE
CONTROL
BOARD
B
YES
NO
YES
NO
NO
NO
YES
YES
NO
YES
YES
YES
NO
NO
NO
NO
YES
YES