Espar Heater
Optional accessary heaters are available from the factory in several configurations. Familiarize yourself with the equipment on your specific vehicle, and follow the manufacturer's operating and maintenance instructions.
Warning: Do not operate fuel-operated heaters in an area where flammable vapors, including gasoline or diesel fumes, are present, such as at filling stations and tank farms. Turn off a fuel-operated heater and allow it shut down completely before entering an area where flammable gases or liquids are present. Heaters continue to operate for up to three minutes after being turned off.
Failure to observe these precautions could cause an explosion or fire, resulting in serious property damage, and personal injury or death.
Note: Always ensure that air inlet and outlet grilles are not restricted. Restriction of any air inlet or outlet ports could result in damage to the auxiliary heater.
Important: To maintain reliable performance, run the accessory heater for at least 15 minutes every month to prevent fuel from degrading.
Accessory heaters function when the ignition switch is in the off position and the cab load disconnect switch is on, if equipped.
Important: Wait three minutes after shutting down an accessory heater before turning the cab load disconnect switch (CLDS) to OFF.
Note: The low voltage disconnect (LVD) control prevents a heater from draining the batteries below starting voltage.
Espar Heater
Refer to the Espar website,www.espar.com, for additional information.
Espar Mini-Controller
To turn the heat on, press the heat button. See Fig.. The red indicator will illuminate when heat mode is activated. Adjust the desired temperature with the control knob; rotate the temperature control knob clockwise for warmer air, or counterclockwise for cooler air. To turn the heat off, press the off button.
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Temperature Control Knob
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Fan Button
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Fan Indicator (blue)
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Off Button
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Heat Indicator (red)
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Heat Button
Fig. 1, Espar Mini-Controller
To turn the fan on, press the fan button. The blue indicator will illuminate when ventilation mode is activated. To turn the fan off, press the off button.
Espar Digi-Controller
Vehicles built after December 8, 2011 with the Digi-Controller and D2 air heaters are equipped with an internal LVD in the Digi-Controller that prevents the heater from draining battery voltage below 12.0 volts.
To turn heat mode on, press the heat button and the heater will begin its start-up cycle. See Fig.. ON will display briefly followed by the ambient temperature, and the green indicator will illuminate. Ambient display temperature range is 41°F to 90°F.
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Ambient Temperature Sensor
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Down Arrow Button
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Fan Button
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Fan Indicator (blue)
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Heat Indicator (green)
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Heat On/Off Button
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Up Arrow Button
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Ambient Temperature Display
Fig. 2, Espar Digi-Controller
To adjust the desired temperature, press the up or down arrow buttons. The desired temperature will display briefly, followed by the ambient temperature. The desired temperature will remain in the modulator memory when the heater is not in operation. Temperature adjustment range is from 41°F to 90°F.
To turn heat mode off, press the heat button again. The heater will initiate a 3-minute cooling cycle.
To turn the fan on, press and hold the fan button until the blue indicator illuminates and the display shows active rotating digits. To turn the fan off, press the fan button again.
Note: The Digi-Controller also has a programmable run timer that will automatically shut the heater off after the set time limit. The default time limit setting is 10 hours.