Part number 550-142-850/0115
37
FreeStyle
™
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
Figure 46
-AXIMUMANDMINIMUMmOWRATESTHROUGH
BOILERHEATEXCHANGER
Boiler
Model
MAX
Flow Rate
20° F
temperature rise
'0-
MIN
Flow Rate
50° F
temperature rise
'0-
Flow Rate
Delta T1
protection
50° F
temperature rise
'0-
&3
&3
17
Primary/Secondary System Piping
System water piping methods
.EARBOILERPIPING
1. Connect boiler to system only as shown in Figure 47, page 38.
The primary/secondary piping shown ensures the boiler loop
WILLHAVESUFlCIENTmOW
2.
3ELECT A BOILER LOOP TEMPERATURE RISE FROM
Figure 49, page 39.
The table indicates the flow and head loss characteristics at that
TEMPERATURERISEANDSUGGESTSPOTENTIALSPEED#IRCULATORSOFOTHER
BRANDSNOTLISTED7ILO!RMSTRONG"' AREACCEPTABLEIFTHEY
MEETTHEmOWANDHEADREQUIREMENTSOFTHEDESIGN
6ERIFY THAT THE
boiler loop piping matches closely
with the listed criteria in the
NOTICE
BELOW)FNEAR
BOILERPIPINGISDIFFERENTCALCULATEHEADLOSSSEPARATELY
USINGHEATEXCHANGERPRESSUREDROPINFORMATIONFROM
Figure 49, page 39 and match to an appropriate pump
speed.
4HEPRESSUREDROPSSHOWNAREFORNEARBOILERPIPINGAS
illustrated in Figure 48, page 38
WITHFEETOFSTRAIGHT
piping. System circulators and zone circulators
3. Install a system circulator or zone circulators as shown in the
piping diagrams in the Primary/Secondary System Piping section
in this manual. These circulators must be supplied by the installer.
3YSTEMORZONECIRCULATORSmOWRATES
1. Size circulators based on the flow rate required to achieve the
temperature drop required. You can closely estimate temperature
RISEORDROP THROUGHACIRCUITBYUSINGTHEFOLLOWINGFORMULA
where TD is temperature rise (or drop), FLOW is flow rate (in
GPM AND"45(ISTHEHEATLOADFORTHECIRCUIT
&,/7
=
BTUH
nnnn
4$X
%XAMPLES
:
1.
#ONSIDERASYSTEMLOOPFORASYSTEMWITHTOTALHEATINGLOADEQUAL
to 210,000 Btuh. The desired temperature drop through the system
piping is 20°F. Then the required flow rate is:
&,/7
=
nnnn
20 x 500
=
GPM
3)-0,)&)%$
&ORTEMPERATUREDROP&,/7-"(
3YSTEMORZONECIRCULATORHEADREQUIREMENT
1.
4HECIRCULATORMUSTBECAPABLEOFDELIVERINGTHEREQUIREDmOW
against the head loss that will occur in the piping.
2. Determine the pipe size needed and the resultant head loss
using accepted engineering methods.
See Figure 48, page 38
FOR
the head loss through the boiler.
Expansion Tank Location
Figure 47, page 38
SHOWTYPICALINSTALLATIONOFTHESYSTEM
expansion tank. It is highly recommended that you locate
the air separator and expansion tank as shown in the sug-
gested piping drawings on pages 37 - 39.
Ensure that the expansion tank size will handle boiler and
SYSTEMWATERVOLUMEANDTEMPERATURE3EETANKMANUFAC
-
TURERSINSTRUCTIONSANDRATINGSFORDETAILS!DDITIONALTANKS
MAYBEADDEDTOTHESYSTEMIFNEEDEDTOHANDLETHEEXPAN
-
sion. These tanks may be installed by connecting to tees in
the system piping.
Undersized expansion tanks
cause system
WATER TO BE LOST FROM THE RELIEF VALVE AND
makeup water to be added through the fill
VALVE %VENTUAL BOILER FAILURE CAN RESULT DUE
to excessive make-up water addition. Always
locate the
cold-water fill connection
at the
expansion tank. Never locate this elsewhere.
Diaphragm- or bladder-type tank:
2EFERTO
Figure 47
FORSUGGESTEDPIPINGWHENUSINGADIA
-
phragm- or bladder-type expansion tank.
Diaphragm- or bladder-type expansion
tank—Always check pressure and charge
tank with tank removed from system to be
sure reading is accurate. Boiler relief valve is
set for 30 PSIG.
/PERATINGPRESSUREOFSYSTEM
AFTER TEMPERATURE EXPANSION ABOVE COLD lLL
PRESSURESHOULDNOTEXCEED03)'TOAVOID
WEEPINGOFRELIEFVALVE
)NSTALLANAUTOMATICAIRVENTONTOPOFTHEAIRSEPARATORPER
SEPARATORMANUFACTURERSINSTRUCTIONS
