Fitting The Flow Temperature Sensor, Secondary Circuit; Connecting The Condensate Drain And Routing The Ribbon Heater - Viessmann Vitocal 300-A Installation And Service Instructions Manual

Installation sequence
Making the hydraulic connections
Note
■ In underfloor heating circuits, install a temperature
limiter to restrict the maximum temperature of under-
floor heating systems.
■ Ensure minimum flow rate: see "Specification".

Fitting the flow temperature sensor, secondary circuit

The flow temperature sensor for the secondary circuit
is installed in the heating water flow inside the build-
ing.
Note
If an instantaneous heating water heater is installed, fit
the flow temperature sensor for the secondary circuit in
the heating water flow downstream of the instantane-
ous heating water heater.
3.
C
D
2.
Fig. 10
Pipe section with sensor well
A
Spring clip
B
Flow temperature sensor, secondary circuit
C
Sensor lead plug and lead to the heat pump con-
D
trol unit

Connecting the condensate drain and routing the ribbon heater

Note
Subject to temperature and relative humidity of the
■
drawn air, up to 20 l of condensate per hour can
occur in the appliance.
■ During the defrosting process, the amount of con-
densate can be as high as 20 l within 5 min.
18
(cont.)
1.
A
B
1. Fit the pipe section with a sensor well.
2. Secure the flow temperature sensor for secondary
circuit with a spring clip in the sensor well.
3. Connect the sensor lead and the lead to the heat
pump control unit.
4. Connect the lead to the heat pump control unit to
the controller and sensor PCB inside the heat
pump control unit at connection F8. If necessary,
extend the lead to the heat pump control unit on
site.
■ Connect condensate drain via siphon (backup level
at least 60 mm) in the frost-protected area to on-site
drain connection (drainage or sewer system): see
page 12.
■ Route condensate drain (drain pipe DN 40) with a
constant fall of at least 2 %.
■ Where appropriate, provide thermal insulation or a
ribbon heater around the condensate drain on site.