Operating instructions

46
Part Number 550-142-784/0812
GWA Series 2 Gas-Fired Water Boilers – Boiler Manual
 InstallGWAboilersforresidentialradiantpanelsystems,convertedgravity
heating systems or other low water temperature applications per instructions
in this manual to avoid damage due to condensation.
 GWAboilersareCSAdesigncertiedforinstallationoncombustibleooring.
 GWAboilersareASMEratedfor50psigworkingpressure.
1. BasedonstandardtestproceduresprescribedbytheUnitedStatesDepartmentof
Energy.
2. NetAHRIratingsarebasedonnetinstalledradiationofsufcientquantityforthe
requirementsofthebuildingandnothingneedbeaddedfornormalpipingandpickup.
Ratingsarebasedonapipingandpickupallowanceof1.15.Anadditionalallowance
shouldbemadeforunusualpipingandpickuploads.
3. Seeinformationatrightformodelnumbersufxes.Lettersshownaremodelnumber
sufxes.An“N”afterthemodelnumberdesignatesnaturalgas.An“L”designates
propanegas.The letter after the“-”designates the pilot ignition system—“I”for
spark-ignitedpilot.Forexample,asufx“L-I”meansapropanespark-ignitedpilot
boiler.
4. Contactyourlocaldealerregardinginformationandpartsforhighaltitudeapplications.
5. The DOE heatingcapacityoutputforthisunitis59,000Btuh&NetAHRIratingis
50,000 Btuh.
15 Ratings
DOE
Boiler
model
number
0-2,000 feet altitude
2,000-4,500
feet altitude
Net
AHRI
ratings
(Btuh)
Boiler
water
content
(gallons)
DOE
Seasonalefciency
(% A.F.U.E.)
Chimney
and
breeching
size
N - L
Input
(Btuh)
DOE Heating Capacity
(Output)(Btuh)
Input
(Btuh)
Output
(Btuh)
(Note 3) (Note 1) (Note 4) (Note 2) (Note 3)
GWA-052
52,000 43,000 46,800 37,400 37,000 1.5 83.0 4”I.D.x20”
GWA-070
70,000 58,000 63,000 50,400 50,000 1.5
83.0
Note 5
4”I.D.x20”
GWA-105
105,000 88,000 94,500 75,600 77,000 2.1 83.0 5”I.D.x20”
GWA-140
140,000 117,000 126,000 100,800 102,000 2.7 82.5 6”I.D.x20”
GWA-175
175,000 145,000 157,500 126,000 126,000 3.3 82.2 6”I.D.x20”
GWA-210
210,000 175,000 189,000 151,200 151,000 3.8 82.4 7”I.D.x20”
GWA-245
245,000 202,000 220,500 176,400 176,000 4.4 82.2 7”I.D.x20”