Page 16
27.
Route the wires that attach to the high limit
switches along the copper siphon loop, back to
the right side of the heater. Reconnect the wires
to the wire harness.
28.
Route the wires that attach to the temperature
sensor along the copper siphon loop, back to the
right side of the heater. Reconnect the wires to
the tabs on the back of the control panel
(marked as J4-1 and J4-2).
29.
Use plastic wire ties to refasten the temperature
sensor and high limit switch wires to the copper
siphon loop. Bundle the wires near the control
panel and fasten them with a wire tie.
NOTE:
Be sure that none of the wires are in
contact with a sharp edge or a hot surface.
30.
Slide the upper right side panel back into the
corner posts on the right side of the heater. Push
it down until the tabs on the panel lock into the
top of the corner posts.
31.
Install the flat return header side cover plate
(removed from the left side of the heater) on the
right side to cover the return header by replacing
the four philips head screws, one in each corner.
32.
Slide the upper left side panel back into the
corner posts on the left side of the heater. Push it
down until the tabs on the panel lock into the top
of the corner posts.
33.
Remove the button plug from the inlet/outlet side
cover plate.
34.
Reinstall the inlet/outlet header side cover plate
located under the inlet/outlet header. It is held
with four philips head screws, one in each
corner.
NOTE:
Only the small tab of the top groove will
fit behind the upper panel.
35.
Remove the button plug type washer from the
left side cover panel. This panel will not be used
in reassembling the heater after a heat exchanger
reversal. However, the button plug washer will
be needed.
Do not
replace the cover panel over
the vent switch outlet. Doing so may cause the
heater to malfunction.
36.
The gas line may enter the heater from either the
left side or the right side. Replace the button plug
washer in the hole through which the gas line will
enter the heater.
37.
Use the button plug to cover the hole on the
opposite side of the heater.
NOTE:
Be sure that the white fiber gasket is
positioned on the top flange of the exhaust vent.
38.
Replace the top. While positioning the top, pull
the control panel through the hole and place it on
top of the panel. Be sure that the flange at the
back of the top panel slides under the flange on
the rear panel to hold the top securely. Fasten the
top to the heater by replacing the two hex head
screws at the upper corners of the raceway.
39.
Position the vent grill over the exhaust vent.
Replace the four philips head screws that fasten
the vent grill to the top.
40.
Reinstall the control panel assembly into the top
panel. Slide the back of the bezel into place, then
lower the front, aligning the holes in the bezel
with the holes in clips on the tabs on the top
panel. Replace the two philips head screws
located at the front edge of the bezel.
41.
Slide the raceway cover up to the top of the
heater. Be careful not to pinch any wires.
Replace the two screws on the bottom flange to
hold the cover in place.
42.
Replace the front panel (door).
5.5 Connections at Heater
The LX and LT Low NOx heaters have a
standard two (2) inch water header and coupling
design. With this feature, only nominal two inch PVC
or CPVC may be connected to the heater. However,
by installing the appropriate pipe adapters and two
short pieces of two inch plastic pipe (supplied by the
installer), any size existing pipe may be fitted to the
heater.
To connect a section of 2” PVC or CPVC pipe
to the heater, first slip a coupling nut onto the pipe.
Then prepare the end of the pipe with the proper
PVC/CPVC primer and glue. Follow the
manufacturer’s instructions provided with the primer
and glue for preparation procedures and curing times.
Apply the slip-fit side of the coupling to the end of the
pipe. Allow the glue to cure completely. Set the o-ring
into the groove on the face of the coupling. Slide the
coupling nut up to the coupling and tighten it to the
threaded connection on the header (see Figure 15).
Figure 15. Piping to Heater
O-RING
COUPLING
COUPLING
NUT
PVC OR CPVC PIPE