Operating instructions

9
Part Number 550-142-784/0812
GWA Series 2 Gas-Fired Water Boilers – Boiler Manual
Figure 4 Vent damper assemblies
Damper installation
 Donotmodifydrafthoodorventdamper,ormake
another connection between draft hood and vent
damperorboiler exceptasnotedbelow.Thiswill
voidCSA certication andwillnot be coveredby
warranty.Anychangeswillcauseseverepersonal
injury, death or substantial property damage.
1. Installventdamperhorizontallyorverticallyasshowninvent
damper manufacturer’s instructions.Vent damper must be
installed so that it serves only one boiler and so damper blade
indicator is visible to the user. See Figure 4.
2. Screwsorrivetsusedtosecuretheventdampertothedraft
hoodmustnotinterferewithrotationofthedamperblade.
3. Installdamperharnessbetweendamperactuatorandholein
jacketleftsidepanel.SeeFigure 3, page 8.
 Usestrainreliefconnectorsandlocknutstosecurebothends
ofdamperharness.
 Keep wiring harness clear of all hot surfaces.
Wireinsulationcouldbedamaged,causingriskof
electrical short-circuit.
4. Read and apply the harness plug warning label (shown upper-
left)sothatitisvisibleafterinstallation
5. Plug damper harness receptacle into damper harness plug.
Bypassing (jumpering) vent damper will cause flue
productssuchascarbonmonoxidetoescapeinto
the house. This will cause severe personal injury or
death.
 After boiler has operated once, if either end
of harness is disconnected, the system safety
shutdown will occur. The boiler will not operate until
harness is reconnected.
 Efkal or Field Controls damper — Damper hold
openswitchmustbeinAutomaticOperationposition
forsystemtooperateproperly.
Vent damper continued
2 Prepare boiler continued
Effikal or Field
Controls damper
Johnson Controls damper
72519
Damper
blade
indicator
Hold-open switch (Effikal only) —
Install vent damper so that switch
is visible and accessible to user.
Refer to vent manufacturer’s instructions to install
plug (shipped with damper) in damper hole.