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Connections
Safety Connections (with Hydrostat 3250-Plus Control)
Legend
A Pressure relief valve
B Nipple, ¾" x 3½"
C Tee, 1½" x ¾" x 1½"
Legend
A Hydrostat 3250-Plus high limit control
B Electro-well
C Hex bushing
20
Vitorond 100, VR1 40 to 63, 161 to 245 Installation and Service
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" (150 mm) above a floor drain.
The end of the pipe must not be threaded.
Minimum connection diameters:
Pressure relief valve...............................................
Discharge pipe.......................................................
Piping to precharged expansion tank VR1 40 to 63,
161 to 245 ..........................................................
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 control
1. Install supplied high limit control as shown.
Maximum allowable temperature setting is 240°F (110°C).
Refer to instructions supplied with
the Hydrostat 3250-Plus control.
¾
"
¾
"
¾
"
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