Freestyle 80 - Closed-Type Expansion Tank

Part number 550-142-850/0716
39
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WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual
&IGURE0IPINGTOCLOSEDTYPEEXPANSIONTANK
17 Primary/Secondary System Piping (continued)
Closed-type expansion tank:
 $/./4USEACLOSEDTYPETANKIFCONNECTING
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.
#ONNECTPIPINGvORÐvFROMTHEAIRSEPARATOROUTLETTO
THETANKlTTING3LOPEANYHORIZONTALPIPINGAMINIMUMOF
INCHPERFEETOFHORIZONTALPIPE
!LWAYSUSEAtank fittingSUCHASTHE"'4ANKTROLOR4ACO
4ACOTROLSHOWN4HElTTINGREDUCESGRAVITYmOWOFWATER
in the piping to the tank, avoids air bubbling through the tank
water, and provides the proper fill height in the tank.
Correct all leaks in the system or tank piping.
,EAKSALLOWAIRTOESCAPEFROMTHESYSTEMAND
WILLCAUSEWATERLOGGINGOFTHETANK4HIS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-type expansion tank—Follow tank
MANUFACTURERSINSTRUCTIONSFORlLLINGTHETANK
4YPICAL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03)'/PERATIONPRES-
SUREOFSYSTEM AFTER TEMPERATUREEXPANSION
ABOVECOLDFILL PRESSURE SHOULD NOTEXCEED
03)' TO AVOIDWEEPINGOF RELIEVEVAlve.
'RAPH PRESSUREDROPTHROUGHFreeStyle
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HEATEXCHANGER
Tac o 00 7
Taco 0014
Grundfos UPS 15-58
(High)
Taco 0015 (High)
B&G NRF 25 (High)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
0123456789101112
Total Head - feet water
Flow -
gp
m
1
1 = Boiler Pressure Drop with 3/4'' near boiler piping (80KBTU and120 KBTU)
2 = Boiler Pressure Drop with 1'' near boiler piping (80KBTU and120 KBTU)
3 = Boiler Pressure Drop with 1 '' near boiler piping (155 KBTU)
4 = Boiler Pressure Drop with 1 1/4'' near boiler piping (155 KBTU)
2
3
4
Taco 0011