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

Vitorond 100, VR1-22 to -33 Installation and Service
Safety Connections (Vitotronic Control)
Legend
A Pressure relief valve
B Nipple, ¾" x 3½"
C Tee, 1½" x ¾" x 1½"
Pressure relief valve
1. Install pressure relief valve. Pipe pressure relief valve
as illustrated and connect to boiler water supply
connection.
Refer to instructions supplied with
the pressure relief valve.
2. Install discharge pipe on pressure relief valve.
The discharge pipe should terminate approximately
6 in. (150 mm) above a floor drain. The end of the
pipe must not be threaded.
Minimum connection diameters:
Pressure relief valve ..............................................
Discharge pipe ......................................................
This boiler does not require a flow switch.
IMPORTANT
Install the (approved) factory supplied pressure relief
valve. Removal of air from the system must occur via
use of air vent(s) in the system supply. To ensure the
boiler can be purged of all air, ensure supply/return water
lines do not contain restrictive piping where air could be
trapped.
WARNING
Do not install an isolation valve between boiler and
pressure relief valve.
The discharge pipe for the pressure relief valve must be
oriented to prevent scalding of attendants. Pipe pressure
relief valve discharge pipe close to floor drain. Never pipe
discharge pipe to the outdoors.
Boiler return injector
1. Install bushing/return water injector combination D.
Connections
"
¾
"
¾
21