Checking The Function Of The Thermally Activated Safety Valve; Checking The Installation Room Ventilation Air Aperture; Test Run; Instructing The System User - Viessmann Vitoligno 250-S Installation And Service Instructions For Contractors

Checking the function of the thermally activated safety valve

Fig. 28

Checking the installation room ventilation air aperture

Test run

1. Start the boiler.
Operating instructions

Instructing the system user

Operating and service documents
File all parts lists, operating and service instructions in
the folder and hand this over to the system user.
Instructing the system user
The system installer should hand the operating instruc-
tions to the system user and instruct the user in oper-
ating the system.

Maintenance and cleaning intervals

Safety instructions regarding maintenance and cleaning
Danger
Touching live components can result in life
threatening injuries. After turning off the
ON/OFF switch on the control unit, there are still
live components inside the control unit enclo-
sure.
■ 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.
■
Commissioning, inspection, maintenance
1. Press red cap
A of the thermally activated safety
valve against the valve.
Water must flow from the valve.
2. If the flow rate is low, clean the valve or replace if
necessary.
2. Check the settings and function of the boiler con-
trol unit.
This includes all components installed as accessories,
e.g. remote control units. In addition, the system instal-
ler must make the user aware of the required mainte-
nance work.
Danger
Hot surfaces and fluids can result in burns or
scalding.
Before maintenance and cleaning work, switch
■
off the system and let it cool down.
Never touch hot surfaces on the boiler, flue
■
system or pipework.
■ Wear suitable personal protective equipment.
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