44 • Condensing Models: On-Demand Water Heater Service Handbook
MAINTENANCE
13.2 Install pipe heaters just below
connec on points “A” and “B.”
(See page 70.) Secure each
one with a clip (item 451).
13.3 Install a pipe heater just above
connec on point “C.” (See
page 70.) Secure it with item
451.
13.4 Install a pipe heater to the
le of connec on point “D.”
(See page 70.) Secure it
with item 451.
14. Install the fuse box at the loca on
shown in Figure 42, page 45.
(See also items 703 & 120, p. 68.)
Secure it by hand- ghtening both
moun ng screws.
15. Hook up the freeze protec on
heater wiring:
15.1 At the top of the fuse box
loca on, connect two plugs
and receptacles as described
in Figure 39.
NOTE: All connectors with
yellow wires are connected
to the same circuit, so the
order in which you connect
them does not ma er.
15.2 Below the fuse box loca on,
connect three plugs and
receptacles as shown in
Figure 40.
Secure these wires with the
cable clamp on the le side
of the cabinet.
16. Install the computer board (PCB):
•
Small feet at the bottom must fit
into the corresponding holes in
the case.
•
Insert the screw at the top of the
computer board, then hand-
tighten it to secure the board
to the fuse box assembly. See
Figure 42.
16.1 Connect all of the wires to
the computer board. All
of the wire connectors are
uniquely sized and shaped
to
fi
t only in the correct
connector on the board.
If necessary, refer to the
schematic on page 22.
NOTE:
•
There are two (2)
receptacles on the
computer board that will
be open. See Figure 41,
page 44.
•
Item “I” in the schematic
(p. 22) uses a separate
wiring assembly which
includes three wires:
yellow, green, and
orange.) Install it as
shown in the schematic.
•
Install the connector
with four white wires
into the computer
board. (See checkpoints
K1/K2 in the schematic
on page 22.)
Fuse Box
Location
Manifold
Plate
Plugs (2)
(Yellow Wires)
Receptacles
(2)
(Yellow Wires)
Install Plugs into Receptacles
Figure 39.
Figure 40.
Below the fuse box location,
connect plugs to receptacles.
Three pair:
white with yellow wires.
Figure 41. Open Receptacles (2)
