Part number 550-142-850/0115
39
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
&IGURE
0IPINGTOCLOSEDTYPEEXPANSIONTANK
17
Primary/Secondary System Piping
(continued)
Closed-type expansion tank:
$/./4USEACLOSEDTYPETANKIFCONNECT
-
ing to a water heater that is equipped with an
automatic air vent.
Figure 49, shows suggested piping when using a closed-
type expansion tank, in which the air is directly in contact
with tank water.
#ONNECTPIPING vORÐv FROMTHEAIRSEPARATOROUTLETTO
THETANKlTTING3LOPEANYHORIZONTALPIPINGAMINIMUMOF
INCHPERFEETOFHORIZONTALPIPE
Always use a
tank fitting
SUCHASTHE"'4ANKTROLOR4ACO
4ACOTROLSHOWN 4HElTTINGREDUCESGRAVITYmOWOFWATER
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.
,EAKSALLOWAIRTOESCAPEFROMTHESYSTEMAND
WILLCAUSEWATERLOGGINGOFTHETANK4HISWILL
RESULTINWATERLOSSTHROUGHTHEBOILERRELIEF
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
LOGGINGOFTHEEXPANSIONTANK
Closed-type expansion tank—Follow tank
MANUFACTURERSINSTRUCTIONSFORlLLINGTHETANK
4YPICALTANKSIZINGPROVIDESFORAPPROXIMATELY
03)'WHENTHETANKISlLLEDTOTHENORMAL
level and system water is cold. Note that boiler
RELIEFVALVEISSETFOR03)'/PERATIONPRES
-
SUREOFSYSTEMAFTERTEMPERATUREEXPANSION
above cold fill pressure, should not exceed
03)' TO AVOID WEEPING OF RELIEVE VALVE
'RAPH
P
RESSUREDROPTHROUGH
FreeStyle
™
HEATEXCHANGER
Taco 007
Taco 0014
Grundfos UPS 15-58
(High)
Taco 0015 (High)
B&G NRF 25 (High)
Boiler Pressure Drop
with 3/4'' Near boiler
piping (80KBTU and
120KBTU)
Boiler Pressure Drop
with 1'' Near boiler
piping (80KBTU and
120KBTU)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0
1
2
3
4
5
6
7
8
9
T
o
tal Head
-
feet w
a
ter
Flow - gpm
