Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 125

Removing hydraulic components and EPP...
Danger
Residual water will escape when the indoor unit
or hydraulic components are fitted or removed.
Contact of live components with water can lead
to severe injury due to electric shock.
Isolate the heat pump from the power supply.
■
Safeguard against unauthorised reconnection.
Protect electrical components from the ingress
■
of water, e.g. electronics modules, plug con-
nectors, electrical cables.
Danger
Residual water will escape when the indoor unit
or hydraulic components are fitted or removed.
Escaping heating water and hot steam can
cause serious injury and damage to the heating
system.
Only carry out work on the system when it has
cooled down and is depressurised.
Overview of torque settings for assembly
Union nuts:
G 12 1 Nm
½ ±
G 1 50 2 Nm
¼ ±
G 1 70 2 Nm
½ ±
Screws:
4.8 x 9.5 3.5 0.5 Nm
±
7
M 4 1.5 0.5 Nm
–
(cont.)
!
Please note
Leaking hydraulic connections lead to appliance
damage.
■ Always use new seals for assembly.
■ Renew damaged fasteners, e.g. clips, screws,
etc.
After installing the new components, check the
■
internal and on-site hydraulic connections for
leaks.
■ In the event of leaks, drain off liquid via the
drain valve. Check the seating of seal rings.
Always replace displaced seal rings.
!
Please note
Filling and venting the system with the transport
bracket loose can cause damage to the outdoor
unit.
Before filling and venting the system, check
whether the transport bracket is secured: See
chapter "Checking the transport bracket".
Indoor unit maintenance
125