Connections
23
Safety Connections (Aquastat Control)
Install safety devices on boiler
H
Pressure relief valve
Legend
Pressure relief valve
Nipple, ¾” x 3½”
Tee, 2” x ¾” x 2”
H
Boiler control
1.
Install pressure relief valve. Pipe
pressure relief valve as illustrated
and
connect to boiler water supply
connection.
Instructions supplied with
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
3
/
4
“
. . . . . . . . . . . . . . . . . . . . . . . . . .
Discharge pipe
3
/
4
“
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Piping to precharged
expansion tank
VR1-40 to VR1-63
3
/
4
“
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
This boiler does
not
require a flow
switch.
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.
1.
Install supplied high limit control as
shown in Fig. 18.
Maximum allowable temperature
setting is 240°F / 110°C.
Instructions supplied with
Honeywell high limit control.
Legend
Honeywell high limit control,
L7248C1008
Immersion well
Hex bushing
5
6
7
1
0
4
4
v
1
.0
A
C
B
Fig. 17
A
C
B
Fig. 18
IMPORTANT
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.
WARNING