Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 63

Secondary side connections (heating circuits)
Type AW-O-M
A Condensate drain
B DHW cylinder flow/heating water
flow
1. Cut suitable entries in sealing mat
D for the hydraulic lines.
2. Route hydraulic lines A, B, D
through the sealing mat, push onto
connections and secure with two
plug-in connector retainers each.
Installation sequence
(cont.)
C DHW cylinder return/heating
water return
D Sealing mat
3. Join the hydraulic lines to the pipes
in the foundation duct.
!
Please note
Water-carrying pipes can
freeze up.
Thermally insulate pipes
against frost.
63