Viessmann VITOROND 100 Installation And Service Instructions Manual page 22

Connections
Water Side Connections (Aquastat Control)
B
C
Fig. 15
Legend
Boiler water supply connection, pressure relief valve
A
High limit control location
B
Boiler water return, drain and automatic feed
C
N
G
H
M
D
E
L
K
P
J
I
Fig. 16
Legend
D Honeywell high limit control
E Immersion well
F Hex bushing, 1½" x ¾"
G Nipple, 2" x 5"
H Pressure relief valve
I Tee, 2" x 2" x ¾"
J Drain valve (sediment faucet), ¾"
22
A
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O
F
K Reducing tee/elbow, 2" x ¾" x 2"
L Street elbow, ¾"
M Nipple, ¾" x 3 ½"
N Reducing tee, 2" x 2" x ½"
O Temperature and pressure gage
P Flue gas adaptor, Ø 6"
2" NPT
. . . . . . . . . . . . . . . . . . . . . . . . . . .
1½" NPTF
2" NPT
Q
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.
IMPORTANT
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 Q.
Remove top back panel before
starting to connect pipe fittings to
boiler water supply connection.
3. Connect system supply to
NPT fittings, as shown in Fig. 16.
Connect the system return to
using NPT fittings, as shown in
Fig. 16.
See installation examples in the
following section starting on page
60.
4. Install temperature and pressure gage
O with brass extension coupling in
½" opening as shown in Fig. 16.
Use thread sealing compound such
as Loctite or Teflon tape.
using