Type 661 – tekmar 661 Snow Detector & Melting Control User Manual
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Step Five
Testing the wiring
• Before applying power to the control for testing, each terminal plug must be unplugged from the
control header. Pull straight down to unplug.
• These 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 — 200 Volts ac, and at
least 0 — 2,000,000 Ohms, is essential to properly test this control.
Test the sensors
• In order to test the sensors, the actual temperature at each sensor must be known. A good
quality digital thermometer with a surface temperature probe is recommended for ease of use
and accuracy of testing. Where a thermometer is not available, a spare sensor can be strapped
alongside the one to be tested and the readings compared. Test the outdoor sensor and the
Snow/Ice sensor according to the instructions in brochures D 001 and D 090.
Sensor and unpowered input connections
Power should never be applied to these terminals. Damage to the control will result.
Snow/Ice Sensor 090 (Must be ordered separately)
This control is designed for use with the tekmar Snow/Ice Sensor 090.
The sensor must be installed flush with the slab surface
and 1/2 way between the cables or heating pipes. See Data Brochure D 090 for the installation instructions regarding the Snow/
Ice Sensor 090 and Socket 091.
• Connect the red wire from the sensor cable to terminal
Red Sen (11).
• Connect the black wire from the sensor cable to terminal
Blk Sen (12).
• Connect the blue wire from the sensor cable to terminal
Blu Sen (13).
• Connect the yellow wire from the sensor cable to terminal
Yel Sen (14).
• Connect the brown wire from the sensor cable to terminal
Brn Sen (15).
17 18
16
Rem
En
Com
Sen
Out
Sen
11
Sen
12 13
15
Sen SenSen Sen
Blk
Brn
Red
Blu Yel
14
Outdoor Sensor
• Connect the two wires from the Outdoor Sensor 070 to the terminals
Com Sen — Out Sen (16 and 18).
Remote Enable (Optional)
• If an external remote enable device is used, connect the two device wires to
terminals
Rem En — Com Sen (16 and 17). When these terminal are shorted
together, the control registers a remote enable.
17
18
16
Rem
En
Com
Sen
Out
Sen
11
Sen
12 13
15
Sen SenSen Sen
Blk
Brn
Red
Blu Yel
14
17
18
16
Rem
En
Com
Sen
Out
Sen
11
Sen
12 13
15
Sen SenSen Sen
Blk
Brn
Red
Blu Yel
14
Electrical connections to terminal plugs of control 661. Control relays are shown in the "power down" condition.
11 12 13
15
14
16 17 18
Brn
Sen
Blu
Sen
Rem
En
Blk
Sen
Yel
Sen
Com
Sen
Out
Sen
Red
Sen
Disconnect terminal plug
from its header
1
2
3
4
Melt
Warning
7
8
Heat
9
10
11
Sen
12 13
15
Sen SenSen Sen
Blk
Brn
Red
Blu Yel
Type 661
Do not apply
power here!
14
17 18
16
Rem
En
Com
Sen
Out
Sen
Safety Divider
Safety Divider
Max. 120 Volts
10A
10A
10A
Safety Divider
Melt Enable
closes when
snow/ice
is detected
Pump
10A
Outdoor
Sensor
070
5
6
Power
N L
Injection Pump,
Injection Valve,
Electric Cables
or Boiler
Remote
Enable
(Optional)
Warning
closes when
a sensor fault
occurs
System
Pump
Power
120 Vac
50/60Hz.
Snow/Ice
Sensor
090
Red
Yellow
Brown
Black
Blue
Note: This is not a wiring diagram. For detailed wiring schematics, refer to the Application Brochures A 661.