Cleaning The Intake Grille And Pellet Sensor In The Pellet Hopper; Lubricating Drive Chains And Drive Unit Bearings; Checking All Installed Position Switches; Checking The Expansion Vessel And System Pressure - Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual

Commissioning, Inspection and Maintenance

Cleaning the Intake Grille and Pellet Sensor in the Pellet Hopper

Lubricating Drive Chains and Drive Unit Bearings

Checking all Installed Position Switches

Checking the Expansion Vessel and System Pressure

Note: The expansion vessel can lose some of its charge
pressure over time. When the boiler heats up, the
pressure gauge will indicate a higher pressure. The
safety valve may also respond and discharge the
excess pressure.
Therefore check the expansion vessel pre-charge
pressure annually.
Check whether the installed expansion vessel is
adequate for the system water volume.
Carry out this test on a cold system.
76
Vitoligno 300-C Installation/Service
1. Open top panel . Remove the 2 rear screws for
A
this purpose.
2. Open tensioning toggles
the tension toggle clip.
3. Remove cover .
C
4. Clean pellet sensor
D
for damage.
5. Clean strainer on the underside of the cover with
E
a soft brush or vacuum cleaner.
6. Replace the cover on the pellet hopper and secure
with tensioning toggles.
7. Remove plastic bend
8. Clean air intake aperture
9. Refit plastic bend and top panel.
Lubricating drive chains and drive bearings should be
completed every 3 years or after the consumption of
66,000 lb. (30,000 Kg) of pellets.
Checking all position switches should be completed annually
or after the consumption of 33,000 lb. (15,000 Kg) of pellets.
1. Drain the system until the pressure gauge shows "0".
Alternatively, close the cap valve on the expansion
vessel and reduce the pressure until the pressure
gauge indicates "0".
2. If the pre-charge pressure of the expansion vessel
is lower than the static system pressure, top up
with nitrogen until the pre-charge pressure is 1.4 to
2.9 psi (0.1 to 0.2 bar) higher than the static system
pressure.
3. Top up with water until the charge pressure of the
cooled system is at least 14.5 psi (1.0 bar), and is
1.4 to 2.9 psi (0.1 to 0.2 bar) higher than the
precharge pressure of the expansion vessel.
Maximum boiler operating pressure: 45 psi (3 bar).
by pushing down on
B
with a soft brush and inspect
from vacuum module
G
with a vacuum cleaner.
H
.
F