OJ Electronics ETR2 User manual

ype E R2
Ice and snow melting
57654C 02/11 (MBC)
© 2011 OJ Electronics A/S

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Introduction
Type ETR2 is an electronic thermostat for fully automatic, economical control of ice and snow melting systems on
small outdoor areas and in gutters. ce forms due to a combination of low temperature and moisture. ETR2
monitors both temperature and moisture, and the heating system is only activated if a possibility of snow or ice is
indicated. ETR2 is suitable for controlling electric heating cables.
Glossary
TEMP SET For setting the temperature at which heating should be activated.
T ME SET For setting the afterheat duration. The length of time the system should continue to provide heat after
the moisture/temperature signals have been eliminated by a heating cycle.
CONSTANT Allows heat to be provided constantly, independently of temperature and moisture.
English
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Startup
• Connect a power supply and the LED will light green.
• Adjust TEMP SET to the temperature at which ice and snow detection should be activated. Recommended
initial setting: +3°C.
• Adjust T ME SET to the required afterheat duration (0-5 hours). Recommended initial setting: 2 hours.
• The thermostat is now set up and will begin melting ice and snow when necessary.
Mode of operation/operating instructions
ETR2 activates the heating system if the outdoor temperature falls below the temperature setpoint
(TEMP SET) and the moisture sensor simultaneously detects moisture.
When the outdoor temperature is below the temperature setpoint, the TEMP LED will light red.
When the moisture sensor detects moisture, the MO ST LED will light red.
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When both preconditions (low temperature and moisture) are met, the thermostat will activate the ice and snow
melting system, and the RELAY LED will light red. After the moisture/temperature signals have been eliminated by
a heating cycle, heat will continue to be provided for the specified length of time, to ensure that all ice and snow is
completely melted.
f some ice and snow remains after the heating system has been deactivated, the afterheat duration should be
increased slightly by adjusting T ME SET. The longer the afterheat duration, the more effective and less economical
the system will be.
f ice and snow is present on the heated area, but the TEMP LED is not lit, the temperature setpoint (TEMP SET)
should be increased to the point where the TEMP LED lights red. The higher the temperature setpoint, the more
effective and less economical the system will be.
Constant heat On
n order to force ice and snow melting ON in any condition, it is possible to turn on the output relay, by turnng the
T ME SET knob to Constant. The ON led flashes as long as Constant is activated. Be aware to adjust T ME SET
back at the desired afterrun time, after all snow and ice has melted, to save energy.
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Note that the CONSTANT HEAT ON setting will result in high energy consumption/costs.
Light indicator overview
© 2011 OJ Electronics A/S
ON The power is on / Constant heat on (flashing)
TEMP Sensor temperature is below TEMP SET
MO ST Moisture/snow has been detected by sensor
RELAY Output RELAY ON / HEAT ON

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Fault codes
f faults occur, the thermostat disables all outputs and ceases to operate until the fault has been remedied.
TEMP LED flashes red: Temperature sensor (ETOG / ETF) has been disconnected or short-circuited.
MO ST LED flashes red: Moisture sensor in sensor (ETOG / ETOR) has been short-circuited.
RELAY LED flashes red: Heating element in sensor (ETOG / ETOR) has been short-circuited.
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OJ Electronics A/S
Stenager 13B · DK-6400 Sønderborg
Tel.: [phone]
Fax: [phone]
[email protected] · www.ojelectronics.com
© 2011 OJ Electronics A/S · ® T e OJ trademark is a registred trademark belonging to OJ Electronics A/S