Connections
18
Water Side Connections
Installation Instructions
Divicon Station
This boiler is designed for closed loop,
forced circulation heating systems only.
1.
Flush heating system thoroughly
(particularly existing systems which
have been in operation for years).
2.
Attach two 1½” NPT adaptors and
gaskets (Installation Fittings Package)
to the welded supply and return
non-NPT nipples on boiler.
Do
not
connect system piping
directly to supply and return nipples.
3.
Connect heating circuits.
Do not connect the system return to
the safety return
.
We recommend the installation of a
spring-loaded flow-check valve in
heating circuits without mixing valves.
This serves to avoid uncontrolled
gravity circulation of heat into the
heating system during prioritized DHW
production, or during summer mon
ths.
Service Instructions
Vitogas 100, GS1
5
1
6
7
4
6
3
v
1
.3
Safety supply, for pressure relief valve and air vent (non-NPT)
∅
1
1
/
2
“
. . . . . . . .
Boiler water supply and return (non-NPT)
∅
1
1
/
2
“
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Boiler drain, for precharged expansion tank and
automatic feed (NPT)
∅
¾”
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drain connection for left cast-iron section (located at boiler front)
Gasket
Connect this end using gasket to non-NPT threads
of welded supply and return boiler nipples
1
1
/
2
“ NPT male threads
IMPORTANT
CAUTION
Failure to flush the heating system
could cause system sludge to settle
in the boiler, causing overheating and
failure. This type of failure is not
covered under warranty.
IMPORTANT
The boiler warranty does not cover
leaks resulting from corrosion caused
by the use of underfloor plastic tubing
without an oxygen diffusion barrier.
Such systems must have the
non-oxygen-diffusion barrier tubing
separated from the boiler with a heat
exchanger. Viessmann recommends
the use of underfloor plastic tubing
with an oxygen diffusion barrier.
CAUTION
CAUTION
To drain the boiler use drain
connection on the back of the boiler
first. Then use the front drain
connection to drain the left cast-iron
section.
Summary of Contents for Vitogas 100 GS1 Series
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