Part number 550-100-270/0122
48
ECO
®
Tec series 2 gas-fired water boiler – boiler manual
Figure56 Piping to diaphragm- (or bladder-) type
expansion tank
DO NOT use a closed-type tank if
connecting to a water heater that is equipped
with an automatic air vent or if an automatic
air vent is incorporated into the system
piping.
Figure56 shows suggested piping when using a closed-
type expansion tank, in which the air is directly in contact
with tank water.
Connect piping (½" or ¾") from the air separator outlet to
the tank tting. Slope any horizontal piping a minimum
of 1 inch per 5 feet of horizontal pipe.
Always use a tank tting such as the B&G Tank-trol or
Taco Taco-trol (shown). e tting reduces gravity ow
of water in the piping to the tank, avoids air bubbling
through the tank water, and provides the proper ll height
in the tank.
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.
is 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.
e air removed from the system will cause
water-logging of the expansion tank.
Closed-type 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, aer temperature expansion above
cold fill pressure, should not exceed 24
PSIG to avoid weeping of relieve valve.
-
Table6
BoilerPumpHeadavailabletosystem
ECO
Tec
80-H 80-H 110-H(110-C) 150-H(150-C)
20° 30°
Ft.w.c. 6.6 12.7 9.1(4.6) 3.9(1.4)
GPM 7.2 4.8 6.5 9.0
Figure57 Boiler Pump Head available to system
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