Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors page 3

Safety instructions
Safety instructions for working on the system
Working on the system
Isolate the system from the power sup-
■
ply, e.g. by removing the separate fuse
or by means of a mains isolator, and
check that it is no longer live.
Note
In addition to the control circuit there
may be several power circuits.
Danger
Contact with live components can
result in severe injuries. Some
components on PCBs remain live
even after the power supply has
been switched off.
Prior to removing covers from the
appliances, wait at least 4 minutes
until the voltage has completely
dropped out.
Safeguard the system against recon-
■
nection.
Wear suitable personal protective
■
equipment when carrying out any work.
Danger
Hot surfaces and fluids can lead to
burns or scalding.
Before maintenance and service
■
work, switch OFF the appliance
and let it cool down.
Never touch hot surfaces on the
■
appliance, fittings or pipework.
Danger
Risk of fire: Electrostatic discharge
can cause sparks which may be
ignited by escaping, flammable
refrigerant (R32).
Prior to commencing work, touch
earthed objects such as heating or
water pipes to discharge static
loads.
(cont.)
!
Please note
Electronic assemblies can be dam-
aged by electrostatic discharge.
Prior to commencing work, touch
earthed objects such as heating or
water pipes to discharge static
loads.
Work on the refrigerant circuit
Refrigerants are air displacing, colour-
less, odourless gases.
R32 forms flammable mixtures with air.
■
R410A is not flammable.
■
Danger
Direct contact with liquid and gas-
eous refrigerant can cause serious
damage to health.
Avoid direct contact with liquid and
■
gaseous refrigerant.
Wear personal protective equip-
■
ment when handling liquid and
gaseous refrigerant.
Danger
Unregulated escape of refrigerant in
enclosed spaces can lead to
breathing difficulties and suffoca-
tion.
Never breathe in refrigerant
■
vapours.
Ensure adequate ventilation in
■
enclosed spaces.
Perform the following measures before
beginning work on the refrigerant circuit:
Check the refrigerant circuit for leaks.
■
Ensure very good ventilation especially
■
in the floor area and sustain this for the
duration of the work.
Safety instructions
3