Viessmann VITOROND 100 Installation And Service Instructions Manual page 25

Water Side Connections (Vitotronic Control)
B
C
Fig. 20
Legend
A
Boiler water supply connection, pressure relief valve
B
Boiler water return with return injector nozzle
C
Safety return; connect precharged expansion tank,
boiler drain, and automatic feed
M
L
E
F
K
O
I
J
N
H
G
Fig. 21
Legend
Nipple, 2" x 5"
Pressure relief valve
Tee, 2" x 2" x ¾"
Drain valve (sediment faucet), ¾"
Reducing tee/elbow, 2" x ¾" x 2"
I
J Street elbow, ¾"
A
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P
Nipple, ¾" x 3 ½"
K
Reducing tee, 2" x 2" x ½"
L
Temperature and pressure gage
M
Flue gas adaptor, Ø 6"
N
O Return injector, 1½" NPT
IMPORTANT
This boiler is designed for closed loop,
forced circulation heating systems only.
1. Flush heating system thoroughly
(particularly with existing systems
which have been in operation for
years).
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.
2" NPT
1½" NPT
IMPORTANT
2" NPT
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 summer months.
2. Remove screw
Remove top back panel before
starting to connect pipe fittings to
boiler water supply connection.
3. Connect system supply to
NPT fittings, Fig. 21
Connect the system return to
using NPT fittings pictured below.
See installation examples.
4. Install temperature and pressure gage
with brass extension coupling
½" opening as shown in the
illustration, Fig. 21
Use thread sealing compound such
as Loctite or Teflon tape.
Connections
.
P
using
in
M
25