Immergas Zeus Superior - Page 52

50
STZSkW ed 12/07 ZEUS Superior kW
Technical DocumentationTechnical Documentation
A
230 VAC are present on terminals L-N of the circuit board
No
Check the electric power supply upstream from the boiler and restore it .
Yes
e circuit board fuses are integral.
No
See section E
Yes
e wiring between the circuit board and the display board is OK.
No
Restore the electric connection/replace the wiring.
Yes
Replace the circuit board. If the anomaly should persist, replace the display board.
B
230 VAC are present on clamps 3-4 of connector X16 on the circuit
board
No
Replace the circuit board.
Yes
230 VAC are present on the pump clamps.
No
Restore the electric connection/replace the wiring.
Yes
e motor shaft can turn freely.
No
Release the pump by acting on the shaft after having loosened the front
cap.
Yes
e starter condenser is integral.
No
Replace the condenser.
Yes
Replace the circulation pump.
C
HEATING PHASE:
230 VAC are present on clamps 1-3 of connector X1 on the circuit
board.
DOMESTIC WATER PHASE:
230 VAC are present on clamps 2-3 of connector X1 on the circuit
board.
No
Replace the circuit board.
v
e wiring between the 3-way motor and the board is OK.
No
Restore the electric connection/replace the wiring.
Yes
e 3-way cartridge functions normally (it is not blocked).
No
Release/replace the 3-way cartridge.
Yes
Replace the three-way valve motor.
D
At least 20 VDC are present on the gas valve modulation coil
wires.
N.B.: perform the measurement by disconnecting the coil wires (see
gas circuit chapter).
No
Check cabling and eventually replace the circuit board.
Yes
e gas valve modulation coil ha s a resistance of 20-25 Ohm (SIT
845).
N.B.: carry out the measurement by disconnecting the coil wires (see
gas circuit chapter).
No
Replace the gas valve.
Yes
e gas valve is calibrated correctly.
No
Adjust minimum and maximum values of the gas valve in agreement with
that stated in the instruction book.
Yes
e NTC ow probe OK (10 kΩ a 25°C).
No
Replace the NTC ow probe.
Yes
Replace the circuit board.
E
e operations stated below are indispensable in order to check the correctness of the electric contacts of the relays on the board.
Replace the fuses checking that there are no components in short circuit (pumps, fan, gas valve, etc...).
Check safety times and the complete disconnection of the gas valve, operating as follows:
- close the gas power supply eand make a functioning request;
- check that, after 2 ignition attempts, the display shows error "01";
- with the aid of the single wire wiring diagram, use the tester to check there is no voltage on both main power supply cables of the main coils of the
gas valve (see gas circuit chapter).
Sections