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General piping information:
• If installation is to comply with ASME or Canadian
requirements, an additional high temperature limit is
needed. Install control in supply piping between boiler
and isolation valve. Set control to a minimum of 20 °F
above set point of the boiler limit temperature sensor.
Maximum allowable set point is 220 °F. Wire control
as shown on wiring diagram (page 20 & 21).
• e Hydrostat 3250 control has an integrated LWCO
device. e probe for the control is inserted into the
well located on the top o the boiler. Ensure the probe
is fully inserted into the well.
• Use backow check valve in cold water supply as re-
quired by local codes.
Install piping:
• See Table 3 for pipe sizing for near-boiler piping and
single-zone piping.
• See Figure 6, page 15.
• See Figure 7, page 15.
• See page 16.
• See page 17.
• See page 18.
• Refer to Weil-McLain’s “Primary/Secondary Piping
Guide.”
• Install relief valve vertically in elbow supplied. See
Figure 6 or 7 for location.
• See WARNING at right.
• Also refer to tag attached to relief valve for manufac-
turer’s instructions.
To avoid water damage or scalding
due to relief valve operation:
• Discharge line must be connected to
relief valve outlet and run to a safe place
of disposal. Terminate the discharge
line to eliminate possibility of severe
burns should the valve discharge.
• Discharge line must be as short as pos-
sible and be the same size as the valve
discharge connection throughout its
entire length.
• Discharge line must pitch downward
from the valve and terminate at least
6” above the floor drain where any
discharge will be clearly visible.
• The discharge line shall terminate
plain, not threaded, with a material
serviceable for temperatures of 375 °F
or greater.
• Do not pipe the discharge to any place
where freezing could occur.
• No shuto valve shall be installed be-
tween the relief valve and boiler, or in
the discharge line. Do not plug or place
any obstruction in the discharge line.
• Failure to comply with the above guide-
lines could result in failure of the relief
valve to operate, resulting in possibil-
ity of severe personal injury, death or
substantial property damage.
• Test the operation of the valve aer
filling and pressurizing system by
liing the lever. Make sure the valve
discharges freely. If the valve fails to
operate correctly, replace it with a new
relief valve.
Connect water piping
Part number 550-143-013/0621
14
Series 3
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