Model LJ Pool and Spa Heater
Page 13
Caution
It may be necessary to have help lifting the heat
exchanger out and replacing it.
12. Lift the heat exchanger assembly out of the
heater. Reinstall heat exchanger 180 degrees
(inlet/outlet header left) from it's original position.
13. After replacing the heat exchanger into the
heater, the end baffles must be replaced. Each
one is held in place by two screws which mount
to the top of the combustion chamber wall.
Reinstall the baffles on the front and rear of the
heat exchanger before continuing with the
"Reversible Water Connections" procedure.
14. Remove pressure switch retainer (plastic cable
clamp) from the inner panel (allow pressure
switch to float).
15. Reroute pressure switch tube and thermostat
bulb assembly through hole in left side of vesti-
bule cover in reverse order. Relocate the pres-
sure switch tube and temperature sensor through
the open side of the vestibule.
16. Reinstall the temperature sensing bulb in the
header, and fasten it with the retainer bracket
and screw.
17. Reinstall the compression fitting at the end of the
pressure switch tube into inlet/outlet header and
tighten the fitting.
18. Route the white wiring from the high limit
switches beside the heat exchanger and down to
the original location following the pressure switch
tubing. Secure white wires to the pressure switch
tube with plastic wire ties.
19. Connect the white wire labeled PS to the pres-
sure switch and the other white wire to its
original location on the fusible link.
20. Reinstall the drain plugs and tighten securely.
Replace jacket/plug grommets.
21. Install the flue collector assembly. Be sure the
front and rear panels of the flue collector are
installed into the grooves on the front and rear
combustion chamber heat shield panels. Be sure
the sheet metal panels are not pinching any
wires.
22. Attach the flue collector hold down clamps to the
clips located under the two center header bolts.
23. Replace the gap closures and tighten the screws
securely. Be sure to replace the insulation,
completely covering the temperature sensor.
Insulation must be a minimum of 1" thick.
Figure 12. Piping installation.
24. Double-check to make sure the wiring is not
pinched against sharp edges, or resting on the
flue collector assembly.
25. Reinstall rain shield assembly.
26. Replace the top assembly. Make sure the tabs
are outside the heater jacket. Fasten the top
assembly with the hex-head screws.
27. Install plastic tie wraps on wiring in the vestibule
(controls compartment).
28. Install heater door.
5.5 Connections at Heater
The heater has 2" NPT universal header cou-
plings. You can connect threaded 2" NPT iron pipe,
unthreaded 1-1/2" iron pipe, 1-1/2" or 2" copper pipe
without an adapter (see Figure 12).
Plastic piping (PVC Schedule 40) can be con-
nected to the heater if local codes allow it, by using the
CPVC nipples included with your heater.
