Model LJ Pool and Spa Heater
Page 25
Do not adjust the pressure switch if the heater is
installed more than 15 feet (4.57 m) below or 6 feet
(1.83 m) above the pool surface. Consult your local
Jandy representative for recommendations.
On some installations, the piping from the heater
to the pool is very short. The back pressure could be
too low to trigger the pressure switch. If this happens,
it may be necessary to install a directional fitting or
elbows where the return line enters the pool. This will
increase back pressure enough for the heater to
operate properly.
Make sure the pool filter is clean before making
any pressure switch adjustment: A dirty filter will
restrict the water flow and the pressure switch cannot
be adjusted properly. To adjust the pressure switch:
1.
Turn the pump 'OFF' by pressing the PUMP key
so that the display shows that the pump is 'OFF'.
If the heater was running it should go off immedi-
ately and the pump will run in the 'COOL
DOWN' mode for 5 minutes. If the heater has
been running within the last 5 minutes, the pump
will continue to run for the remainder of the 5
minute cool down period (see Figure 19).
The LJ heater also accommodates the use of a
more functional remote control. Remote controls that
provide their own temperature sensor such as the
Jandy Aqualink RS remote control systems can be
wired to the Fireman Switch connection. The LJ
controller must first be set up to recognize the remote
mode. The set up consists of setting the 'PROGRAM'
(pump time clock) 'ON' and 'OFF' times to run for 24
hours, setting the controller function to 'SPA' and
setting the spa temperature to 104°F (40°C)
To set the LJ controller for remote control use,
follow the instructions at the beginning of this section
to set the pump to run for 24 hours.
To operate the heater by the remote unit, use the
SELECT key on the LJ controller keyboard to set
the heater to the 'SPA' mode.
Then follow the instructions in Section 7.2.3,
"Setting the Pool and Spa Temperatures", to set the
spa temperature limit to 104°F (40°C). This will allow
the remote system's temperature settings to control the
water temperature to a maximum of 104°F (40°C).
The LJ controller now acts as a "slave" controller
and heater functions are controlled by the remote
control system.
To restore control of the heater functions to the
LJ controller, disconnect the remote system from the
Fireman's Switch, reprogram the pump time clock to
desired settings and reset the 'SPA' temperature to the
desired setting.
7.6 Adjusting the Pressure Switch
Caution
The pressure switch should be adjusted to turn
the heater off when the pump is off. Setting the
switch to close at too low of a flow can damage
the appliance. Adjust the switch to turn the
heater off, not on.
The pressure switch is preset at the factory for
activation at 2 psi (14 kPa). Adjust the pressure switch
only if any part of the filter system piping is 3 feet
(0.91 m) or more above the top of the heater jacket.
CONTROLLER
FLAME SENSOR
GAS VALVE
SAFETY CIRCUIT
FIREMAN
SWITCH
PUMP
BLOWER
POWER IN
SELECT
PLUG
IGNITER
POWER
IN
R
POWER
IN
ON
OFF
R
Figure 18. ON/OFF Type remote switch.
Figure 19. LJ controller display.
2.
Set the pool temperature control to the maximum
setting. Repeatedly depress the MODE key until
the indicator at the top of the display shows
'POOL SET'. Press the ENTER key. Then use
the UP key to set the temperature to 104°F
(40°C). Press the ENTER key again.
3.
Turn filter pump on by depressing the PUMP
key. If a two-speed pump is used, make sure it is
at high speed.
NOTE:
Heater should not be allowed to fire on
low speed.
4.
Set the controller to 'POOL' by repeatedly
depressing the SELECTION key until the display
shows that the heater is set to 'POOL'. The
heater should start.
5.
Pry out the rubber dust plug on the top of the
pressure switch.
6.
Use a 7/32 inch (5.55 mm) Allen wrench to turn
the adjustment screw very slowly clockwise until
the heater goes off (see Figure 20).
Summary of Contents for LJ
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