Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 17

Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Boiler Connections
(continued)
Boiler water drain valve
Using a water drain valve facilitates the drainage of a heat
exchanger. The supplied drain valve must be installed in
each boiler section before filling.
1. Locate and remove drain plug for each boiler section.
2. Install drain valve assembly for each boiler section as
shown.
Legend
A 1b in. x 10 in. nipple
B 1b in. to c in. reducer
C c in. sediment faucet
Installing the isolation valve handle
Remove the isolation valve handle A from the accessory
pack and insert it into the receiver handle B of the
isolation valve until it locks into place. Repeat for all valves.
Note: The handle is only used for initial installation and
for service. The handle must be removed prior to
putting the boiler into operation.
Installation
17