Viessmann Vitoligno 300-H Installation And Service Instructions For Contractors page 126

Maintenance
Fuses
For installation position, see page 143.
Appliance fuse protection (to EN 60127-5)
F10
■ T10 A (slow)
■ 250 V, 50/60 Hz
■ 5 x 20 mm
Power cable KSK
■
F30
■ T5 A (slow)
■ 250 V, 50/60 Hz
■ 5 x 20 mm
Power cable HKK
■
F40, F41, F42, F43
■ T10 A (slow)
■ 400/250 V, 50/60 Hz
Checking the fuses
1. Isolate the system from the power supply, e.g. by
removing the separate fuse or by means of a
mains isolator, and check that it is no longer live.
Safeguard the system against reconnection.
2. Open the control unit.
Battery
The battery serves to save the time and date in the
event of a power failure.
Button cell, type CR2032, 3 V
■
Replacement: Every 5 years
■
High limit safety cut-out
!
Please note
Cutting or kinking the pipeline (capillary) of the
high limit safety cut-out (STB) can cause the
heating system to fail permanently.
Do not bend capillaries and observe the mini-
■
mum permissible radius (5 mm) when routing
them.
■ If the capillaries are bent or damaged, the high
limit safety cut-out must be replaced.
126
■ 5 x 20 mm
■ Power cable ZPK
F51, F52, F61, F62, F71, F72
T5 A (slow)
■
400/250 V, 50/60 Hz
■
■ 3 x 10 mm
■ Supply to motors:
– F51, F52: Discharge motor (plug
F61, F62: Motor for screw conveyor/rotary lock
–
valve (plug )
sYH
– F71, F72: Feed screw conveyor motor (plug
3. Check the fuses. Replace if necessary (see con-
nection and wiring diagram).
Danger
Using the wrong fuses or inserting them
incorrectly can lead to an increased risk of
fire.
■ Do not use force to insert the fuses. Posi-
tion the fuses correctly.
Only use structurally identical types with
■
the stated response characteristics.
For installation position, see page 143.
The high limit safety cut-out is part of the boiler.
The high limit safety cut-out is located behind the
boiler programming unit.
)
sYK
)
sYD