Connecting The Secondary Circuit; For Type Awb-Ac Only: Connecting The Cooling Circuit - Viessmann Vitocal 200-S Installation And Service Instructions For Contractors

Installation sequence

Connecting the secondary circuit

Fig. 15
Refrigerant lines from/to the outdoor 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 49.
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.

For type AWB-AC only: connecting the cooling circuit

For surface cooling systems (e.g. underfloor heating
circuit, chilled ceiling), a contact humidistat (accesso-
ries) is required.
22
!
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 48.
4. Thermally insulate lines inside the building.
5. Connect the drain hose to the safety valve.
Connect the drain hose to the public sewage sys-
Connection
tem with a fall and a pipe vent.
G 1
¼
Note
G 1
¼ In underfloor heating circuits, install a temperature
■
limiter to restrict the maximum temperature for
underfloor heating systems: see page 27.
G 1
¼
■ Ensure the minimum flow rate, e.g. by means of an
overflow valve: see "Specification" on page 115.
Contact humidistat requirements:
■ Power connection: 230 V~, 0.5 A
■ Installation inside the room to be cooled at the cool-
ant 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
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■ 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.