Viessmann B1KE Combi Series Installation And Service Instructions Manual page 17

Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Mounting the Boiler and Making Connections
B1HE/KE 85/120
B1HE/KE 150/199
Piping Connections
2 imperfect threads Use moderate amount of dope
Leave 2 threads bare
(continued)
Connections on the heating water and DHW sides
If the connections have not been fitted previously, make
the connections on the heating water and DHW sides.
Note: If no tank is connected, close off the tank supply
and return with caps (B1HE only).
Note: If the boiler is used for directly connected DHW
only a bypass must be installed from boiler supply
to boiler the boiler return.
Legend
A Heating system supply
B1HE/B1KE 85, 120 ¾ in. NPT
B1HE/B1KE 150, 199 1 in. NPT
B Tank heating supply (B1HE)/DHW (B1KE)
B1HE/B1KE 85, 120 ¾ in. NPT
B1HE/B1KE 150, 199 1 in. NPT
C Tank heating return (B1HE)/DCW (B1KE)
B1HE/B1KE 85, 120 ¾ in. NPT
B1HE/B1KE 150, 199 1 in. NPT
D Heating system return
B1HE/B1KE 85, 120 ¾ in. NPT
B1HE/B1KE 150, 199 1 in. NPT
E Gas connection NPT ¾" (male thread)
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
Use a two-hand wrench method when tightening

fittings or piping onto the boiler connectors. Use
one wrench to prevent the boiler pipes from twisting
and the second wrench to tighten the fitting or
piping. Failure to support the boiler connection could
damage the boiler and its internal piping.
All plumbing must meet or exceed all local state and

national plumbing codes.
Proper piping practice
Support piping by proper suspension method.
Piping must not rest on or be supported by boiler.
See following page for details on gas connection and piping.
WARNING
Do not damage the gas pipe!
The gas pipe must not come into contact with any
other components in the appliance.
Keep the gas pipe from twisting during tightening by
using the two wrench system. Do not use pliers!
Installation
17