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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.
Changing from Fahrenheit to
Celsius
The Model LX heater displays temperature in Fahrenheit units when
FIGURE 22. GAS VALVE
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
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,
