tekmar 667 Snow Detector & Melting Control Installation User Manual

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2009 D

667

03/09

tekmar Net™ (tN2) Device

A Remote Display Module (RDM) 040 or Remote Start / Stop Module
039 can be connected to the tekmar Net™ (tN2) input. Connect the
Com terminal from the appropriate tN2 device to the Com terminal
(9) on the 667. Connect the tN2 terminal from the appropriate tN2
device to the tN2 terminal (10) on the 667.

Note: The wires from the RDM and Remote Start / Stop Module are
polarity sensitive. The tN2 device does not operate correctly if the
wires are reversed.

STEP FIVE

TESTING THE WIRING

Each terminal block must be unplugged from its header on the control before power is applied for testing. To remove the terminal
block, pull straight down from the control.

The following tests are to be performed using standard testing practices and procedures and should only be carried out by properly
trained and experienced persons.

A good quality electrical test meter, capable of reading from at least 0 – 300 V (ac) and at least 0 – 2,000,000 Ω, is essential to
properly test the wiring and sensors.

Test The Sensors

In order to test the sensors, the actual temperature at each sensor
location must be measured. A good quality digital thermometer with
a surface temperature probe is recommended for ease of use and
accuracy. Where a digital thermometer is not available, a spare sensor
can be strapped alongside the one to be tested and the readings
compared. Test the sensors according to the instructions in the Data
Brochure D 070, D 079 or D 090.

Test The Power Supply

Make sure exposed wires and bare terminals are not in contact with
other wires or grounded surfaces. Turn on the power and measure the
voltage between the Power L and Power N terminals (24 and 25) using an
AC voltmeter, the reading should be between 103.5 and 126.5 V (ac).

Test The Powered Inputs

Melt / Idle Demand

If a Melt / Idle demand is used, measure the voltage between the Melt
/ Idle Demand terminals (15 and 16). When the melting or idling device
calls for heat, you should measure between 20 and 260 V (ac) at
the terminals. When the melting or idling device is off, you should
measure less than 5 V (ac).

Test The Outputs

System Pump (Sys P1)

If a system pump is connected to the Sys P1 terminal (23), make
sure that power to the terminal block is off and install a jumper
between the Sys P1 and Power L terminals (23 and 24). When power is
applied to the Power L and Power N terminals (24 and 25), the system
pump should start. If the pump does not turn on, check the wiring
between the terminal block and pump and refer to any installation
or troubleshooting information supplied with the pump. If the pump
operates properly, disconnect the power and remove the jumper.

9 10

Com

Boil

Power

103.5 to 126.5 V (ac)

20 to 260 V (ac)

Melt/Idle

Demand

23 24

Sys

Power

115 V (ac)