Viessmann Vitodens 333 Instruction Manual page 6

Preparations for boiler installation
1. Prepare the primary connections.
Thoroughly flush the heating sys-
tem.
Note
Should an on-site diaphragm
expansion vessel be required,
install this into the heating return. If
no connection set (accessory) is
used, install the on-site fill tap into
the heating return.
2. Prepare the secondary connec-
tions. Install the safety assembly
(accessory or on-site provision) to
DIN 1988 [or local regulations] into
the cold water supply line.
6
Supplied By www.heating spares.co Tel. 0161 620 6677
(cont.)
3. Equip the DHW circulation pipe
with circulation pump, check valve
and time switch.
4. Connect the condensate drain with
a pipe vent to the public sewer.
5. Prepare the gas connection
according to TRGI or TRF or all
local regulations.
6. Prepare the electrical connections.
&
Mains cable: NYM-J 3 x 1.5 mm
fuse max. 16 A, 230 V~, 50 Hz.
&
Accessory cables: NYM with the
required number of conductors
for the external connections.
&
All cables in area "H" should
protrude 2 000 mm from the wall.
2
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