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Connections
Water Side Connections (with Hydrostat 3250-Plus Control)
Legend
A Boiler water supply connection,
pressure relief valve:.................................1½" NPT
B High limit control location:........................1a" NPTF
C Boiler water return, drain and automatic feed:.1½" NPT
Legend
D Hydrostat control 3250 Plus
E Electro-well
F Hex bushing, 1½" x ¾"
G Nipple, 1½" x 5"
H Pressure relief valve
I Tee, 1½" x 1½" x ¾"
J Drain valve (sediment faucet), ¾"
16
Vitorond 100, VR1 22 to 33, 91 to 140 Installation and Service
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).
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 A to using NPT fittings,
as shown in the illustration. Connect the system
return C to using NPT fittings, as shown.
See installation examples in the following section
starting on page 41.
4. Install temperature and pressure gage O with brass
extension coupling in ½" opening as shown in
the illustration. Use thread sealing compound such
as Loctite or Teflon tape.
Hydrostat control is equipped with a remote mounting
kit (c/w a 48" sensor cable) for easy installation of the
control in a convenient location.
K Reducing tee/elbow, 1½" x ¾" x 1½"
L Street elbow, ¾"
M Nipple, ¾" x 3½"
N Reducing tee, 1½" x 1½" x ½"
O Temperature and pressure gage
P Flue gas adaptor, Ø 5"
WARNING
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