John Wood Direct Vent - Manuel (Page 32)

32 www. johnwoodwaterheaters .com
6. Grasp the manifold tube and push down slightly to
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 33).
8. Carefully remove the manifold/burner assembly
from the combustion chamber. BE SURE NOT TO
DAMAGE ANY INTERNAL PARTS.
VIEWPORT
PILOT TUBE
MANIFOLD
DOOR
MANIFOLD COMPONENT
BLOCK
MANIFOLD
TUBE
OUTER DOOR
NOT SHOWN
MANIFOLD
SCREW (2)
GAS CONTROL
VALVE/THERMOSTAT
THERMOPILE
WIRE
CONNECTIONS
GAS CONTROL/
TEMPERATURE
KNOB
PIEZO IGNITER
BUTTON
Figure 33
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 34).
Important: DO NOT remove the orifi ce.
SCREWS
BURNER
(BOTTOM VIEW)
PILOT
ASSEMBLY
(BOTTOM VIEW)
KEEP DRAIN
HOLE IN THIS
POSITION
Figure 34
3. When replacing the burner, ensure the drain hole is
in the position shown in Figure 34.
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 34).
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 35 & Figure 38).
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 35).
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
in the manifold component block.
BURNER AND
OTHER FITTINGS
NOT SHOW FOR
CLARITY.
PILOT/THERMOPILE
ASSEMBLY SCREW
THERMOPILE
CONNECTOR
PILOT
TUBE
IGNITER
WIRE
MANIFOLD
COMPONENT
BLOCK
RETAINER
CLIP
MANIFOLD
DOOR
PILOT/THERMOPILE
ASSEMBLY
GASKET
TAB
BRACKET
SLOT
VIEWPORT
Figure 35
5. Lift the pilot/thermopile assembly (including the igniter
wire) from the manifold assembly (see Figure 36).
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
WIRES
THERMOPILE
CONNECTOR
PILOT TUBE NOT
SHOWN FOR CLARITY
IGNITER
CONNECTOR
PILOT/
THERMOPILE
ASSEMBLY
THERMOPILE
PILOT
Figure 36
7. Route the new pilot tube, igniter wire and thermopile
wires through the opening in the manifold door (see
Figure 35).