Takagi T-H3J-DV Service Handbook page 61

4.1 Open the clip that secures
the yellow wires to the
bottom, left-hand side of the
cabinet. Remove the wires.
See Figure 52.
4.2 Remove both screws that
secure the fuse box and lift
the fuse box away. (It will
still be connected to wires.)
4.3 Unlatch the connectors on
the freeze protection heater
wires. There are 5 sets of
these white connectors with
yellow wires (one above
the fuse box assembly,
three below the fuse box
assembly, and one near the
bottom, right-hand side of
the cabinet).
INDOOR MODELS ONLY:
The plug on the back of
the fuse box connects it
to the freeze protection
thermostat. This thermostat
hangs off of the intake vent
Indoor Models:
Freeze Protection Thermostat
Hangs from Air Intake Vent.
Figure 53.
On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models
(top, left of cabinet). Leave
that thermostat in place.
(See Figure 53.)
When you are finished, the
plug, wire, and fuse box will
hang from the intake vent.)
5. Remove the flow sensor/control
valve (item 402, page 74) as
described in the following steps.
See also page 49 or 50.
5.1 Remove fasteners 16A and
14-22 (items 460 and 461,
page 74).
NOTICE: If you have a 540
model with a bypass valve,
you must remove an
additional fastener. See item
458 at connection point
(two places), page 74.
5.2 Pull the cold connection
tube (item 466, page 74)
from the outlet of the flow
sensor/control valve.
Example:
Freeze Protection Heaters
with Clips
Figure 54.
NOTICE: If you have a 540
model, you must pull a
portion of the tube out of
the bypass valve as well.
5.3 Turn the flow sensor/control
valve gently and lift it off of
the inlet.
6. Remove the cold connection tube
(item 466, page 74) as follows:
6.1 Disconnect fastener 16-
25 (item 462, page 74)
from the top of the cold
connection tube.
6.2 Remove two heaters and
clips (located at the top
and bottom of the cold
connection tube):
◦
A
Items 414 & 451, p. 74.
◦
Items 415 & 451, p. 74.
See also Figure 54.
6.3 Remove the cold connection
tube from the heat exchanger.
6.4 Remove the cold connection
tube from the cabinet.
7. Remove the igniter assembly:
See page 49 or 50 during the
following sub-steps.
7.1 Remove the screw that
secures the igniter assembly.
7.2 Disconnect the igniter
wire at the igniter rod wire
connection.
8. Disconnect the blue wires from
the high limit switch. See "High
Limit Switch (Heat Exchanger),"
page 49 or 50.
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