Removing The Burner From The Manifold/Burner; Assembly; Natural Gas (Low Nox) & Propane (Lp) Gas Burner; Replacing The Pilot/Thermopile Assembly - A.O. Smith DIRECT VENTED GAS MODELS Installation And Operating Manual

free the manifold tube and pilot tube.
7. Remove the screws (1/4" nut driver) securing the
manifold/burner assembly to the combustion chamber
(Figure 34).
8. Carefully remove the manifold/burner assembly
from the combustion chamber. BE SURE NOT TO
DAMAGE ANY INTERNAL PARTS.
GAS CONTROL/
VALVE/THERMOSTAT
TEMPERATURE
KNOB
PIEZO IGNITER
BUTTON
PILOT TUBE
VIEWPORT
OUTER DOOR
NOT SHOWN
MANIFOLD COMPONENT
BLOCK
Figure 34
REMOVING THE BURNER FROM THE MANIFOLD/
BURNER ASSEMBLY
Natural Gas (Low Nox) & Propane (LP) Gas Burner
1. Take off the burner by removing the two (2) screws
located underneath the burner.
2. Check the burner to see if it is dirty or clogged. The
burner may be cleaned with soap and hot water (see
Figure 35).
Important: DO NOT remove the orifi ce.
SCREWS
KEEP DRAIN
HOLE IN THIS
POSITION
BURNER
(BOTTOM VIEW)
Figure 35
3. When replacing the burner, ensure the drain hole is
in the position shown in Figure 35.
34
GAS CONTROL
THERMOPILE
WIRE
CONNECTIONS
MANIFOLD
MANIFOLD
SCREW (2)
MANIFOLD
PILOT

ASSEMBLY

(BOTTOM VIEW)

REPLACING THE PILOT/THERMOPILE ASSEMBLY

1. Remove the manifold door assembly as described in
"Removing The Manifold/Burner Assembly" section.
2. Remove the burner to access the pilot/thermopile
assembly. Remove and keep the screws securing the
burner to the manifold (see Figure 35).
Important: DO NOT remove the orifi ce.
3. Remove the screw securing the pilot/thermopile
assembly to the pilot bracket and keep for reuse later
(see Figure 36 & Figure 39).
4. Lift the retainer clip straight up from the back of
the manifold component block (using a fl at-blade
screwdriver), then remove the manifold component
block from the manifold door (see Figure 36).
TUBE
Important: Be careful not to bend or alter the position of
the pilot tube. It will be used as a bending template for the
new pilot assembly. Note the placement/order of the wires
DOOR
in the manifold component block.
THERMOPILE PILOT
CONNECTOR TUBE
VIEWPORT
MANIFOLD
COMPONENT
BLOCK
5. Lift the pilot/thermopile assembly (including the igniter
wire) from the manifold assembly (see Figure 37).
6. Read this step carefully before proceeding. Using the
old pilot/pilot tube assembly as a guide, bend the new
pilot tube to match the old one. Make only the bends
closest to the pilot before going to the next step.
THERMOPILE
CONNECTOR
THERMOPILE
WIRES
7. Route the new pilot tube, igniter wire and thermopile
wires through the opening in the manifold door (see
Figure 36).
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RETAINER
CLIP
IGNITER
WIRE
SLOT
Figure 36
PILOT
IGNITER
CONNECTOR
SHOWN FOR CLARITY
Figure 37
PILOT/THERMOPILE
ASSEMBLY SCREW
PILOT/THERMOPILE
ASSEMBLY
TAB
BRACKET
BURNER AND
OTHER FITTINGS
NOT SHOW FOR
CLARITY.
GASKET
MANIFOLD
DOOR
THERMOPILE
PILOT/
THERMOPILE
ASSEMBLY
PILOT TUBE NOT