Install Relief Valve - Weil-McLain Aqua Balance WMB-155 Manual

W
TM
AquaBalance
17 Primary/Secondary System Piping

Install relief valve

1. Install relief valve in 1 " x 1" x ¾" (for WMB-80/120) or 1
x ¾" (for WMB-155) tee piped from boiler return (Figure 6, page 11).
2. Pipe the relief valve only as shown, in the location shown.
3. Connect discharge piping to safe disposal location, following guidelines
in the WARNING below.
To avoid water damage or scalding due to relief
valve operation, as per local or state codes
Install relief valve ONLY with the spindle vertical, as
shown in illustrations in this manual.
Discharge line must be connected to relief valve out-
let and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility
of severe burns or property damage should the valve
discharge. Locate away from the top of the boiler.
Discharge line must be as short as possible 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 shutoff valve shall be installed between the relief valve
and boiler, or in the discharge line. Do not plug or place
any obstruction in the discharge line.
Test the operation of the valve after filling and pres-
surizing system by lifting the lever. Make sure the valve
discharges freely. If the valve fails to operate correctly,
replace it with a new relief valve.
Failure to comply with the above guidelines could result
in failure of the relief valve to operate, resulting in pos-
sibility of severe personal injury, death or substantial
property damage.
40
M -
ALL OUNT GAS FIRED WATER BOILER
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Boiler Manual
(continued)
" x 1 "
-1/4 -1/4
:
Part number 550-100-305/0118