Installation – tekmar 661 Snow Detector & Melting Control User Manual
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Caution
Improper installation and operation of this control could result in damage to the equipment and possibly even personal
injury. It is your responsibility to ensure that this control is safely installed according to all applicable codes and
standards. This electronic control is not intended for use as a primary limit control. Other controls that are intended and
certified as safety limits must be placed into the control circuit.
Step One
Getting ready
Check the contents of this package. If any of the contents listed are missing or damaged, please refer to the Limited Warranty
and Product Return Procedure on the back of this brochure and contact your wholesaler or tekmar sales agent for assistance.
Type 661 includes:
• One Snow Detector & Melting Control 661 • One Outdoor Sensor 070
• One Data Brochure D 661 • Application Brochures A 661 • One Data Brochure D 001
Other information available: • Essay E 000 • Essay E 600
Read Application Brochures A 661 and select the correct Application for your job.
Note : This control must be installed with a Snow/Ice Sensor 090 and Socket 091. The Snow/Ice Sensor 090 and Socket 091
are not included with the type 661 and must be ordered separately.
Carefully read the details of the Sequence of Operation sections in all applicable brochures to ensure that you have chosen the
proper control and you understand its functions within the operational requirements of your system.
Step Two
Mounting of the base
The control should be removed from its base by pressing down on the release clip in the wiring chamber and sliding upwards
on the control. The base is then mounted in accordance with the instructions in the Data Brochure D 001.
Step Three
Rough-in Wiring
All electrical wiring terminates in the control base wiring chamber. It has standard 7/8" (22mm) knock-outs that accept common
wiring hardware and conduit fittings. Before breaking out the knock-outs, check the wiring diagram and select those sections of
the chamber with common voltages. Do not allow the wiring to cross over sections as safety dividers, installed later, prevent this.
Power should not be applied to any of the wires during the rough-in wiring stage.
• Install the Snow/Ice Sensor 090 according to the instructions in Data Brochure D 090 and run the wiring back to the base.
• Run the wiring from other system components to the base.
• Run the wiring from the 120 V ac source to the base.
Use a clean 120 V ac power source to ensure proper operation.
• Multi-strand 16 AWG wire is recommended for the 120 V ac wiring due to its superior flexibility and ease of installation into
the terminal sockets.
Installation
Step Four
Electrical connection to the control
Power and output connections
•
The installer should test to confirm that no voltage is present at any of the wires.
• Install the control back into the base, sliding it down until it snaps into place.
• Connect the 120 V ac power supply to terminals
Power N — Power L (5 and 6).
Melt Output
• Connect the melting system circuit to terminals
Melt (1 and 2). These terminals lead to an
unpowered (dry) relay contact inside the control which closes when the control is in melting
mode. The most common devices to be turned on (enabled) by the 661 are pumps, heating
devices or other tekmar controls.
Warning Output
• If desired, connect a warning device to terminals
Warning (3 and 4). These terminals lead
to a dry relay contact inside the control which closes when there is a sensor or wiring failure.
Caution: The 661 is an operating control and is not certified as a safety device. If safety
considerations are critical, a separate alarm system must be installed.
Pump Output
• Connect the System Pump to terminals
Pump (7 and 8). These terminals lead to a dry
relay contact which closes when the control is in melting mode or idling mode.
Heat Output
• Connect the heating device circuit (electric cables, injection pump, injection valve, or
boiler) to terminals
Heat (9 and 10). These terminals lead to a dry relay contact which
closes when the control requires heat to be added to the slab.
Power
N L
6
7
8
5
Pump
1
2
Melt
3
4
Warning
Heat
9
10
Power
N L
6
7
8
5
Pump
1
2
Melt
3
4
Warning