38
Time Clock/Fireman’s Switch
To operate the heater with a time clock, connect the timer
to the clock/fireman’s switch connection in the heater’s
wiring.
The time clock should be of the dual-switch type and set
to "shutoff the call-for-heat" to the pool heater 15 to 20
minutes prior to shutting down the pool pump.
The fireman’s switch connection is located at the power
junction box. Splice into the Purple wire jumper tagged
“Where necessary" add “Fireman’s switch circuit here” to
connect the time clock. See
Figure 59
.
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' (15 m) of total wiring using 18 AWG
stranded copper wire rated for 221°F (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 shutoff the call-for-
heat.
CLOCK/
FIREMAN
SWITCH
WIRE
JUMPER
F10829-1
Figure 59. Clock/Fireman Switch Wire location
Water Pressure Switch
The water pressure switch ensures that the heater operates
only when the filter pump is in operation. It is located on the
In/Out header. It is factory-set at 1.75 PSI for deck level
installation.
Water Pressure Switch Adjustment
When the heater is located below the level of the spa or
pool, it may be necessary to adjust the pressure switch to
compensate for the no-flow static head. If it is necessary to
adjust the water pressure switch, do the following:
1. Make sure the pool filter is clean before adjusting
the switch.
2. Set the heater control to the OFF mode.
3. Turn the filter pump ON and confirm that the pressure
switch is closed (use a multimeter to check). If the
pressure switch fails to close, either the switch
setting is too high or not enough pressure is being
supplied by the filter pump.
4. Turn the heater ON.
5. Manually turn the pressure adjustment knob
clockwise until the heater shuts off. (A flat screwdriver
may be necessary if knob is too tight.)
6. Slowly turn the adjustment knob counter-clockwise
until the heater calls for heat again.
7. Turn an additional 1/2 turn counter-clockwise.
8. While the heater is running, check the adjustment
by turning the pump off and on several times. The
burners should shut off immediately when the pump
is turned off. If it does not, repeat the above steps
until proper operation is observed.
F10671
Figure 60. Water Pressure Switch Assembly
NOTE:
The sheet metal access panels should be in
place at all times to protect the water pressure switch
from rain and other environmental factors.
Summary of Contents for AVIA 264A
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