Connecting The Secondary Circuit - Viessmann BW 35 .AHT PW Series Installation And Service Instructions Manual

Making the hydraulic connections
Fitting the Victaulic couplings
Fig. 26
1. Clean all Victaulic connections.
2. Open Victaulic coupling
Connecting the primary circuit
!
Please note
The heat transfer medium can cause corrosion
damage to on-site lines and components.
The components and lines used must be resist-
ant to the heat transfer medium. Never use zinc-
plated/galvanised pipes.
1. Equip the primary circuit with an expansion vessel
and safety valve (in accordance with DIN 4757).
Note
The expansion vessel must be approved to
■
DIN 4807. Diaphragms of the expansion vessel
and safety valve must be suitable for the heat
transfer medium.
■ Discharge and drain pipes must terminate in a
container that can hold the maximum possible
expansion volume of the heat transfer medium.
2. Ensure adequate thermal and anti-vibration insula-
tion of all pipes routed through walls.

Connecting the secondary circuit

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.
(cont.)
B around 1 cm.
3. Push Victaulic coupling
far as it will go onto connection pipe
pump.
4. Insert connection pipe
Victaulic coupling B .
5. Close Victaulic coupling
there is no gap.
6. Carry out a pressure test.
3. Connect the primary pipes 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
If the casing is not carefully closed, damage
from condensation may occur.
■ With line entries, ensure the diaphragm
grommets on the l.h. side panel are seated
correctly.
■ Make line entries airtight.
4. Insulate primary lines inside the building with ther-
mally insulating and vapour diffusion-proof materi-
als.
5. Fill the primary circuit with Viessmann heat transfer
medium and vent.
Installation sequence
with inserted gasket as
B
in the heat
A
as far as it will go into
C
flush and tighten until
B
31