Operating instructions

8
Part Number 550-142-784/0812
GWA Series 2 Gas-Fired Water Boilers – Boiler Manual
1. Connectfromdrafthoodorventdamperoutlettochimneyor
vent with same size vent connector.
2. Wherepossible,verticalventingtotheoutsidefromthedraft
hoodorventdamperoutletwillofferbestperformance.
3. Where horizontal vent connector is used, slope upward at
least¼”perlinealfoottowardchimneyorventandsupport
with hangers to prevent sagging.
4. Breechingmustnotbeconnectedtoanyportionofamechanical
draft system that can operate under positive pressure.
 Longhorizontalventconnector,excessivenumber
ofelbowortees,orotherobstructionsthatrestrict
theowofcombustiongases should be avoided.
Severe personal injury, death or substantial property
damage could result.
Install vent piping
These systems are used on gas-fired boilers with
ventdampersasshippedfromfactory.Boilerwillnot
operate without vent damper installed.
Only vent dampers listed in the Replacement parts
list on Page 40arecertiedforusewithGWAboil-
ers.Anyotherventdamperinstalledcouldcause
severe personal injury or death.
Damper blade
Standing pilot ignition systems— See vent manufacturer’s
instructions to install plug (shipped with damper) in damper hole.
For standing pilot boilers only, install plug with
3
/8” diameter hole
in vent damper hole.
Spark-ignited pilot systems— See vent manufacturer’s
instructions to install plug (shipped with damper) in damper hole.
For spark-ignited pilot boilers only, install plug with no hole in
vent damper hole.
Minimum clearances
Provide a minimum of 6” between the ventdamper and any
combustiblematerial.(See“Minimumclearancetocombustible
materials,” page 3,forminimumclearancefromjackettoptoceiling
to maintain this dimension.)
Vent damper
Draft hood installation
1. Orientdrafthoodwithspillswitchmountingholestofrontof
boiler as shown in Figure 3.
2. Securedrafthoodtooutletattopofboilerwithsheetmetal
screws.
Draft hood & spill switch
3. Bottomofdrafthoodorskirt must have clearance dimension
abovejackettoppanelasindicatedondrafthood.
 Donotalterboilerdrafthoodorplaceanyobstruction
or non-approved vent damper in breeching or vent
system.CSAcerticationwillbecomevoid.Fluegas
spillageandcarbonmonoxideemissionswilloccur
causing severe personal injury or death.
 Improper orientation of spill switch may cause
boilertoshutdown.Thelossofheatcanresultin
signicantdamageduetofreezing.
Spill switch installation
1. FastenspillswitchtodrafthoodasshowninFigure 3.
2. See Wiring diagram to connect wires:
Spark-ignitedpilotboiler—seepages 21 & 22.
2 Prepare boiler continued
Figure 3 Spill switch with wire harness