Takagi T-H3J-DV Service Handbook page 68

the solenoid valve with
the matching number
except as noted below.
•
The proportional valve
does not have a number
and is located at the
bottom of the assembly.
Connect the wire
assembly with red and
white wires to its fork
terminals.
13.2 Make sure that the screen
inside the gas valve inlet is
still in place.
13.3 Slide the gas valve/manifold
plate assembly onto the
gas inlet connection. (The
gas inlet is located at the
bottom, right-hand corner of
cabinet.)
You may need to rotate
the gas valve while sliding
it down for an easier fit.
The tab on the gas valve
connection should line up
behind the tab on the gas
inlet connection.
13.4 Secure the gas valve to the
gas inlet by installing the
brass screw (with washer)
through both tabs at the
connection. Hand-tighten
only.
See "Brass Screw Securing
Gas Valve..." in Figure 41, p.
49.
13.5 Attach the air tube from the
bottom of the combustion
chamber to the port on the
left side of the gas valve.
(See Figure 69.)
NOTICE: If the air tube is not
connected to the bottom of
68 • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models
the combustion chamber,
connect it now as shown in
Figure 58 (p. 63).
14. INDOOR MODELS ONLY:
Secure the power cord to the
manifold plate as shown in Figure
41, page 49. (See the "Power
Cord Mounting Tab" callout.)
Hand-tighten only.
Use the mounting tab and its
M4X10 screw.
15. Secure the manifold plate:
15.1 Line up the manifold plate
with the holes on the burner,
then hand tighten the top
center screw on the manifold
plate. (See "Manifold Plate,"
page 49.)
15.2 Hand tighten the remaining
manifold plate screws.
Do not overtighten.
NOTICE: Leave the following
mounting holes open:
◦
Fuse box mounting holes
(left side of plate)
◦
Igniter assembly mounting
hole (top, right-hand side
of plate)
◦
Ground wire mounting
location (bottom, center
of plate).
16. Install the igniter assembly to
the top, right-hand corner of
the manifold plate. (See "Igniter
Assembly" and "Igniter Rod Wire
Connection" in Figure 41, p. 49)
16.1 Insert and hand tighten the
screw.
16.2 Slide the black igniter
wire onto the igniter rod.
See "Igniter Rod Wire
Connection" in Figure 41,
page 49.
17. Install the flow sensor/control valve
(item 402, p. 74) and cold pipe (item
466, p. 74) as follows:
17.1 Install the flow sensor/
control valve onto the water
inlet connection (bottom,
center of cabinet).
Figure 69.
Gas Valve
Port
Air Tube
Air Tube Connection
Figure 70.
Flange ts between top and
bottom of clip.
16A Fastener