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Below the Backlight indicator is an RS service
indicator, which displays RS Online when the heater is
connected to an RS unit.
Directly below the RS Service indicator on the
bottom right hand portion of the LCD screen is the
Fahrenheit/Celsius temperature unit indicator.
The Model LT does not offer these features.
3B-2. Turning the Heater On or Off
When power is supplied to the Model LX heater, the
control goes into a diagnostic mode for approximately 15
seconds before the heater can be turned to the Pool or Spa
mode. During this time the display will show "RS Online".
If there is an RS control connected to the heater, it will
sense the RS unit and remain online. If the control is not
connected to an RS unit the "RS Online" indication on the
display will disappear after the initial 15 seconds. When
the display shows "RS ONLINE" all functionality of the
control at the heater is disabled. The heater functions can
be controlled only at the RS unit. However, sensor data is
displayed at both the heater and the RS unit.
To temporarily use the heater controls when online
with an RS control unit, use a thin object to depress the
button marked "RS SERVICE". The "RS ONLINE"
indicator will disappear from the heater display. All
functionality has now been returned to the control at the
heater. In this mode the RS unit has been disabled. To
return the functionality to the RS unit, push the button
again.
When power is first supplied to the Model LT
heater it also runs through a circuit board diagnosis to
make sure that the control is working correctly. Indicator
lights will flash during the 10 second diagnostic sequence.
After the initial diagnostic sequence on the Model
LX, the heater can be turned to Pool or Spa mode by
pressing and releasing the top (mode) button to the right of
the LCD screen so that the selector arrow is aligned with
either the Pool or Spa setting as seen on the LCD screen.
The Model LT heater does not offer the remote
control indicator function. To turn the heater on, press and
release the button located between the "POOL" and "SPA"
indicator lights. Repeat pressing the button to achieve the
desired mode of operation, shown by the indicator lights.
When neither light is on, the heater is "OFF"
It is now necessary to set the thermostat to the
desired pool or spa setting.
3B-3. Setting Pool and Spa Temps,
Changing from Fahrenheit to
Celsius
The Model LX heater displays temperature in
Fahrenheit units when powered-up. To switch to Celsius,
press the F°/C° button. Once the desired temperature
units are selected, the thermostat can be set. The left-most
button below the LCD screen, labelled "Select", will select
either the Pool or the Spa thermostat when depressed.
Either "Pool" or "Spa" will be displayed in the bottom left
corner of the LCD screen. The up and down buttons
will increase or decrease the thermostat setting.
The Model LT heater control is less quantitative and
not automatic. The pool or spa water temperature will need
to be monitored manually as the control is adjusted.
Temperature adjustments are made by turning the knob
assosiated with the mode labeled below it. Turning the
knob clockwise will increase the temperature setting.
Turning it counterclockwise will decrease the setting.
Once the desired setting is acheived, set the temperature
lock by loosening the screw located at the bottom of the
knob and rotating the dial stop counterclockwise until it
contacts the knob. Tighten the screw to lock the stop in
place.
When the thermostat setting exceeds the temperature
of the pool or spa, the heater will fire. The heater will fire
continuously until the pool or spa water is heated to the
selected thermostat temperature. The control will not allow
the heater to fire again for five minutes even if there is a
call for heat, unless the thermostat setting is increased. In
this case, the heater will fire within two minutes. This is to
prevent short-cycling, and thereby increase the life of the
heater.
When the Model LX heater is firing, "Heating" will
be displayed underneath the LAARS LX logo. Note that in
both the "POOL" and "SPA" thermostat settings, the
temperature cannot be raised above 104°F (40°C).
Note that if power is momentarily lost, the
thermostat settings will remain the same.
Also note that the heater should not be used to
maintain water temperatures at or below 70°F (21°C). This
will damage the heater.
3B-4. Error Status
If the heater is powered, in either pool or spa mode,
and there is a call for heat (i.e. the thermostat setting is
higher than the water temperature) the heater will fire.
The blower will come on for approximately 30 seconds,
FIGURE 22. GAS VALVE