Connecting The Secondary Circuit; Connecting A Cooling Circuit If Required - Viessmann Vitocal 200-S Installation And Service Instructions Manual

Connecting the secondary circuit

Fig. 15
Refrigerant lines from/to the external unit
Symbol Meaning
DHW cylinder flow (heating
water side)
Heating water return and
DHW cylinder return
+
Heating water flow
1. Equip the secondary circuit on site with an expan-
sion vessel and safety assembly (in accordance
with DIN 4757).
Fit the safety assembly to the on-site line in the
heating water return: See page 48.
2. Connect the secondary circuit 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.

Connecting a cooling circuit if required

For area cooling systems (e.g. underfloor heating cir-
cuit, chilled ceiling), a contact humidistat (accessory) is
required.
!
3.
Note
The secondary circuit air vent valve is located
inside the appliance. To vent, connect the hose to
the air vent valve and route outwards.
+
Observe additional information regarding filling and
venting: See page 47.
4. Thermally insulate pipes inside the building.
5. Connect the drain hose to the safety valve.
Connect the drain hose to the public sewage sys-
tem with a fall and a pipe vent.
Connection
G 1
¼
Note
■ With underfloor heating circuits, install a temperature
G 1
¼
limiter to restrict the maximum temperature of under-
floor heating systems: See page 26.
Ensure the minimum flow rate, e.g. by means of an
■
G 1
¼
overflow valve: See "Specification" on page 111.
Requirements for the contact humidistat:
■ Electrical connection: 230 V~, 0.5 A
Installation inside the room to be cooled at the cool-
■
ing water flow (remove thermal insulation if required)
If several rooms with different relative humidity are
■
part of the cooling circuit, fit and connect several
contact humidistats in series:
Switching contacts as N/C contacts
Installation sequence
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.
21