Closed-Type Expansion Tank - Freestyle 80 Manual

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17 Primary/Secondary System Piping

Closed-type expansion tank:

to a water heater that is equipped with an au-
tomatic air vent.
Figure 47, shows suggested piping when using a closed-type
expansion tank, in which the air is directly in contact with
tank water.
tank fitting
in the piping to the tank, avoids air bubbling through the tank
water, and provides the proper fill height in the tank.
C orrect all leaks in the system or tank piping.
valve due to over-pressurization. NEVER use
an automatic air vent in a system equipped with
a closed-type expansion tank. The air removed
expansion tank.
Closed-type expansion tank—Follow tank
12 PSIG when the tank is filled to the normal
level and system water is cold. Note that boiler
P
36
1 = Boiler Pressure Drop with 3/4'' near boiler piping (80KBTU and120 KBTU)
34
2 = Boiler Pressure Drop with 1'' near boiler piping (80KBTU and120 KBTU)
32
3 = Boiler Pressure Drop with 1 '' near boiler piping (155 KBTU)
4 = Boiler Pressure Drop with 1 1/4'' near boiler piping (155 KBTU)
30
28
26
24
Taco 0014
22
20
18
B&G NRF 25 (High)
16
14
12
Taco 007
10
8
6
4
2
0
0 1
Part number 550-142-850/0716
M -
OUNT GAS FIRED WATER BOILER
lve.
®
FreeStyle
Taco 0015 (High)
Grundfos UPS 15-58
(High)
2 3 4
—
Boiler Manual
(continued)
-
Taco 0011
5 6 7 8
Flow - gpm
1
3
4
2
9 10 11 12
39