Viessmann Vitocal 242-S Installation And Service Instructions Manual page 29

Connecting the secondary circuit
Symbol Meaning
Heating water return
Heating water flow
E F
D C
Fig. 23 Safety assembly supplied
Pressure gauge
C
Connection G
D ¾
Quick-action air vent valve
E
Safety valve
F
1. Connect the secondary lines to the heat pump:
!
Please note
Mechanically loaded hydraulic connections
lead to leaks, vibration and appliance dam-
age.
Connect on-site lines so that they are free of
load and torque stress.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
Ensure the diaphragm grommets at the pipe
entries are seated correctly. Seal pipe entries
with sealing tape if necessary.
See chapter "Assembly and sealing faces to note".
(cont.)
2. Install the safety assembly provided: Either to an
Connection
on-site line in the heating water return or to the sec-
Cu 28 x 1 mm
ondary circuit connection set (accessories)
Cu 28 x 1 mm
!
3.
Observe additional information regarding filling and
venting: See chapter "Filling and venting the secon-
dary side".
4. Thermally insulate pipes inside the building.
Note
■ With underfloor heating circuits, install a temperature
limiter to restrict the maximum temperature of under-
floor heating systems: See chapter on connecting a
temperature limiter to restrict the maximum tempera-
ture in underfloor heating systems.
■ Ensure the minimum flow rate, e.g. by means of an
overflow valve: See "Specification".
■ The secondary circuit must be equipped on site with
an expansion vessel.
Installation sequence
Connection set installation instructions
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■ Check tightness of the internal and on-site
hydraulic connections.
In the event of leaks, drain off liquid via the
■
drain valve. Check the seating of seal
rings. Always replace displaced seal rings.
29