Heating Water Connections - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Boiler Connections
Connections
(continued)

Heating water connections

PRV
PG
BD
BWS
Fig. 18
Legend
BWR Boiler water return, ¾"
BWS Boiler water supply, ¾"
BD Boiler drain
BF Boiler fill
GC Gas connection, ¾" NPTM
PRV Pressure relief valve
NPT National Pipe Thread
PG Pressure gage
22
NPT
BF
GC
BWR
1. Thoroughly flush heating system
(particularly before connecting the
boiler to an existing system).
2. Connect boiler to the heating
system.
Max. operating pressure
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test pressure
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT
Damage resulting from pressure
exceeding those values stated is not
covered by Viessmann warranty.
H 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.
H All plumbing must meet or exceed all
local state and national plumbing
codes.
IMPORTANT
SUPPORT ALL PIPING USING
HANGERS. DO NOT support piping by
the unit or its components.
H Use isolation valves to isolate system
components.
3 bar/
. . . . .
45 psig
4 bar/
60 psig