Install Relief Valve - Weil-McLain EcoTec 80 Manual

G -
®
ECO Tec
AS FIRED WATER BOILER
Primary/Secondary System Piping
Correct all leaks in the system or tank piping. Leaks
allow air to escape from the system and will cause
water-logging of the tank. This will result in water
loss through the boiler relief valve due to over-
pressurization. NEVER use an automatic air vent in
a system equipped with a closed-type expansion tank.
The air removed from the system will cause water-
logging of the expansion tank.
Closed-t y pe expansion tank—Follow tank
manufacturer's instructions for filling the tank.
Typical tank sizing provides for approximately 12
PSIG when the tank is filled to the normal level and
system water is cold. Note that boiler relief valve is
set for 30 PSIG. Operation pressure of system, after
temperature expansion above cold fill pressure,
should not exceed 24 PSIG to avoid weeping of relieve
valve.
Piping to closed-type expansion tank
Part number 550-100-260/0520
–
80/110/150/199
-
Single Boiler System

Install relief valve

1. Install relief valve in a
tee onto the top water pipe – Air elimination/relief valve
(Figure 8, page 13).
relief valve only as shown in this manual. Ensure
relief valve is located above heat exchanger.
2. Pipe the relief valve only as shown, in the location shown.
3. Connect discharge piping to safe disposal location,
following guidelines in the
B M
OILER ANUAL
(continued)
" street elbow along with a
3/4
the boiler out. Connect the
below.
:
Install relief valve ONLY with the spindle
vertical, as shown in illustrations in this
manual.
Discharge line must be connected to relief
valve outlet 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
pressurizing 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 possibility of
severe personal injury, death or substantial
property damage.
"
3/4
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