Takagi T-H3-DV - Page 68

MAINTENANCE
MAINTENANCE
68 • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models
16.2 Slide the black igniter
wire onto the igniter rod.
See “Igniter Rod Wire
Connecon” 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 ow sensor/
control valve onto the water
inlet connecon (boom,
center of cabinet).
the solenoid valve with
the matching number
except as noted below.
•
The proporonal valve
does not have a number
and is located at the
boom 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
sll in place.
13.3 Slide the gas valve/manifold
plate assembly onto the
gas inlet connecon. (The
gas inlet is located at the
boom, right-hand corner of
cabinet.)
You may need to rotate
the gas valve while sliding
it down for an easier t.
The tab on the gas valve
connecon should line up
behind the tab on the gas
inlet connecon.
13.4 Secure the gas valve to the
gas inlet by installing the
brass screw (with washer)
through both tabs at the
connecon. Hand-tighten
only.
See “Brass Screw Securing
Gas Valve...” in Figure 41, p.
49.
13.5 Aach the air tube from the
boom of the combuson
chamber to the port on the
le side of the gas valve.
(See Figure 69.)
NOTICE: If the air tube is not
connected to the boom of
the combuson 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


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 ghten the top
center screw on the manifold
plate. (See “Manifold Plate,”
page 49.)
15.2 Hand ghten the remaining
manifold plate screws.

NOTICE: Leave the following
mounng 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

16.1 Insert and hand ghten the
screw.
Air Tube Connection
Gas Valve
Port
Air Tube
Figure 
Flange ts between top and
bottom of clip.
Figure 70.
16A Fastener