Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 10

Preparing for installation
Preparing for boiler installation
Rated heating output
range
n (mm)
p (mm)
q (mm)
Fig. 3
10
(cont.)
3.2 - 26 kW 5.2 - 35 kW
1465 1665
1526 1726
201
L
M
Note
All height dimensions have a tolerance of +15 mm due
to the adjustable feet.
224
1. Prepare the heating water connections.
Thoroughly flush the heating system.
Note
Should an additional expansion vessel be required
on site, connect this vessel in the heating return.
2. Prepare the connections on the DHW side. Install
the safety assembly (accessory or on-site provi-
sion) in the cold water line to DIN 1988 and EN 806
(see page 11).
Recommendation:
Install the safety valve above the DHW cylinder to
protect it against contamination, scaling and high
temperatures.
: According to W3 "Principles for creating pota-
c
ble water installations", safety valves must be
drained directly via a visible unrestricted drain or via
a short outlet line to the drain network.
Note
Do not connect the DHW cylinder safety valve to
hose L . Never change the position of hose
(used for ventilation).
3. Route condensate hose
wall ) or to side aperture
G
Route the condensate hose with a U-bend. Connect
it with a fall to the on-site drain line or a trap.
4. Prepare the gas connection according to TRGI or
TRF [or local regulations].
5. Prepare the electrical connections.
■
Power cable: NYM-J 3 x 1.5 mm
ing 16 A, 230 V/50 Hz.
■ Accessory cables: NYM with the required number
of cores for external connections.
■ Allow all cables in area
trude approx. 2000 mm from the wall.
L
to the back (drain in
M
(see page 9).
H
2
, max. fuse rat-
K (see page 9) to pro-