Viessmann AWT-AC 221.A04, Installation And Service Instructions Manual

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8
C DHW circulation
D Opening for 230 V cables
E Cold water
F Liquid line
G Hot gas line
H Heating water flow
K Heating water return
Connection sizes for hydraulic connections
Pos
Sym-
bol Meaning Connections to the internal unit
B – DHW Rp ¾
C – DHW circulation G 1
E – Cold water Rp ¾
F Refrigerant lines from/to
the external unit:
■ Liquid line
7
connection pipe:
(supplied pipe bends)
10 mm
UNF thread: ⅝
For type AWT-AC 221.A04, a reduction
from 10 to 6 mm is necessary down-
stream of the pipe bend (reducer ⅝ to
⁷
⁄
₁₆
supplied).
G ■ Hot gas line
7
connection pipe:
(supplied pipe bends)
16 mm
UNF thread: ⅞
For type AWT-AC 221.A04, a reduction
from 16 to 10 mm is necessary down-
stream of the pipe bend (reducer ⅞ to
¾ supplied).
H Heating water flow Cu 28 x 1 mm
K Heating water return Cu 28 x 1 mm
1. Prepare the connections on the heat-
ing water and the DHW side.
Flush the heating system. 2. Prepare the electrical connections.
Preparing for installation
Requirements regarding on-site connections
(cont.)
5782 201 GB