Water Side Connections (With Vitotronic Control) - Viessmann Vitorond 100 VR1 Series Installation And Service Instructions Manual

Connections
Water Side Connections (Vitotronic Control)
Legend
A Boiler water supply connection,
pressure relief valve......................................1½" NPT
B Boiler water return with return
injector nozzle .........................................1½" NPT
C Safety return; connect precharged expansion
tank, boiler drain, and automatic feed .........1½" NPT
Legend
E Nipple, 1½" x 5"
F Pressure relief valve
G Tee, 1½" x 1½" x ¾"
H Drain valve (sediment faucet), ¾"
I Reducing tee/elbow, 1½" x ¾" x 1½"
J Street elbow, ¾"
20
Vitorond 100, VR1-22 to -33 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).
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 P. Remove top back panel before
starting to connect pipe fittings to boiler water supply
connection.
3. Connect system supply to A using NPT fittings.
Connect the system return to B using NPT fittings
pictured below. See installation examples.
4. Install temperature and pressure gage with brass
extension coupling M in ½" opening as shown in
the illustration. Use thread sealing compound such
as Loctite or Teflon tape.
K Nipple, ¾" x 3½"
L Reducing tee, 1½" x 1½" x ½"
M Temperature and pressure gage
N Flue gas adaptor, Ø 5"
O Return injector