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Time Clock/Fireman's Switch
To operate the heater with a time clock, connect the timer
to the fireman's switch connection in the heater's wiring.
The time clock should be of the dual switch type and set to
shut off the call-for-heat to the pool heater (chauffe-piscine)
15 to 20 minutes prior to shutting down the pool pump.
The fireman's switch connection is located on the 14-
pin header connected to the digital control board. Splice
into the red wire jumper tagged –Where necessary add
"Fireman's" switch circuit here – to connect the time clock.
The fireman's switch connection must be a dry contact
and must not supply power to the heater. Powering the
fireman's switch connection externally may damage
the heater, and is not covered by warranty.
Do not exceed 50 ft (15 m) of total wiring using 18 AWG
stranded copper wire rated for 105°C minimum.
NOTE: When using a time clock, the heater will display
"Clock/Fireman Sw" when the fireman's switch is open,
indicating that the time clock has shut off the call-for-
heat.
Water Flow Switch
The water flow switch ensures that the heater operates
only when the filter pump is in operation. It is located on the
outlet side of the In/Out header. It is factory pre-wired and
pre-set with a minimum water flow paddle. Install conduit to
the upper jacket hole. Connect two wires from the conduit
to the appropriate terminal wires behind the transformer
cover (i.e. orange to orange and orange/black to orange/
black). No further adjustment is needed.
Figure 44. Water Flow Switch Assembly
Flame Roll-Out Safety Switch
Heaters are equipped with a thermal cutoff device to
prevent flame roll-out in the event the heat exchanger
becomes blocked. This is a "single-use" type fusible link
or thermal fuse, that must be replaced when disabled
by an over-temperature condition, caused by excessive
restriction in the heat exchanger flue passage.
Figure 45. Flame Roll-Out Safety Switch
High Limits
The heater is equipped with two high limits.
Both are located on the inlet/outlet header. HL1 is
automatic reset and set to open at 160°F (71°C). HL2 is
automatic and set to open at 135°F (57°C).
NOTE: An erratic high limit is often characteristic of an
internal heat exchanger problem, e.g. scale build-up,
defective bypass. Refer to "TROUBLESHOOTING" on
page 35.
AUTO RESET
Figure 46. High Limit Switches
High Limit Removal
1. Shut off main electrical power switch to heater.
2. Remove inlet/outlet sheet metal access panel.
3. Remove defective high limit and replace with the
correct new high limit.
4. Replace access panel.
Pilot Safety
The heater employs a pilot safety which closes the main
gas valve within 8/10th of a second whenever the pilot
flame is interrupted. The pilot flame is automatically lit
when the device is powered. The heater performs its own
safety check and opens the main valve only after the pilot
is proven to be lit.
F10668
F10669-3
29
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