Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 13

Preparing for installation
Connecting gas and water using connection sets (accessories)
410
398
362
320
165
110
Fig. 7 All possible connection sets are shown (con-
nection to the right, left or top).
1. Prepare the connections on the heating water side.
See page 26.
Thoroughly flush the heating system.
Note
Fit the on-site expansion vessel to 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 26).
Recommendation:
Install the safety valve above the DHW cylinder.
This protects the valve against soiling, scaling and
high temperatures.
3. Prepare the connection from the fuel cell module
and from the gas condensing module to on-site
drain or trap:
See diagram on page 12.
(cont.)
165
110
48
4. Prepare gas connection to TRGI [or local regula-
tions].
5. Prepare electrical connections: see following chap-
ter.
!
Please note
Switching off by means of an emergency
stop switch for the heating system can dam-
age the appliance.
Remove any emergency stop switches from
the existing heating system.
Accessory cables: NYM with the required number
of cores for external connections.
Preparing for installation
13