tekmar 665 Installation

- Data Brochure

Snow Detector & Melting Control 665

D 665

04/12

Replaces: 12/08

The Snow Detector & Melting Control 665 is a microprocessor-based control which operates a single zone snow melting system. The control can operate automatically when a Snow / Ice Sensor 090 is installed or the user can manually enable and/or disable the system. When the control is in the melting mode, the slab is maintained at a “Melting” temperature through an on/off output which operates a contactor for electrical cables, a boiler, an injection pump or an injection valve. When the control is not in the melting mode, the melt system can either be shut down or it can be maintained at an idle temperature for faster response and improved safety. The 665 control includes a large Liquid Crystal Display (LCD) in order to view system status and operating information.

Additional features include:

• Slab Outdoor Reset

• Automatic snow detection and melt control (with 090 sensor)

• Temporary Idle

• Manual Override

• Warm Weather Shut Down

• Cold Weather Cut Out

• Remote display and adjustment capabilities

• Test sequence to ensure proper component operation

• Equipment Exercising

• CSA C US certiﬁ ed (approved to applicable UL standards)

Snow/Ice Sensor

090 installed with

Input

Sensor Socket

091 Optional

Input

Slab Sensor

Optional

Start

Stop

Menu Item

Snow Detector & Melting Control 665

Pulse Width Modulation

Do not apply power

Red2Blk3Blu4Yel5Brn/

Do not apply power

Out7Com8tN2

Slab

Melt Demand

Idle Demand

WWSD

Water

Melting

Idle Demand

Melt Demand

900-03 Designed and assembled in Canada by tekmar Control Systems Ltd.

Power 115 V ± 10% 50/60 Hz 600 VA Relays 230 V (ac) 5 A 1/3 hp Demand 20 to 260 V (ac) 2 VA

Signal wiring must be rated at least 300 V.

10 11

12 13

Melt/Idle

Heat

Demand

Tes t

14 15 17

Melting

Sys

off

not testing

red

testing

red

testing paused

For maximum heat, press and hold Test button for 3 seconds.

Meets Class B: Canadian ICES FCC Part 15

Power L

Date Code

H2028D

Input

115 V (ac) Power Supply

Output

System Pump

Input

Outdoor

Sensor

Included

Remote Display Module (RDM)

Remote Start / Stop Module

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Input

Melt/Idle Demand

Output

Boiler

Output

Turn on injection

pump

Output

Turn on relay for

electric cables

Output

Melt Relay

How to Use the Data Brochure

This brochure is organized into four main sections. They are: 1) Sequence of Operation, 2) Installation, 3) Control Settings, and

4) Tro u b leshooti ng. The Sequence of Operation section has 5 sub-sections. We recommend reading Section A: General of the Sequence of Operation, as this contains important information on the overall operation of the control. Then read to the sub-sections that apply to your installation.

The Control Settings section (starting at DIP Switch Settings) of this brochure describes the various items that are adjusted and displayed by the control. The control functions of each adjustable item are described in the Sequence of Operation.

Table of Contents

User Interface ..................................................Pg 2

Description of Display Elements ..................Pg 3

Sequence of Operation ..................................Pg 4

Section A: General Operation .............. Pg 4

Section B: Snow Melting .......................Pg 4

Section C: Melting Enable / Disable ....Pg 6

Section D: Melting Operation ............... Pg 8

Section E: Idling Operation ..................Pg 9

Installa tion ....................................................... Pg 10

Electrical Connections .......................... Pg 12

Testing The Wiring .................................Pg 14

DIP Switch Settings ........................................Pg 16

Access Levels .................................................Pg 16

Control Settings ..............................................Pg 17

View Menu ..............................................Pg 17

Adjust Menu ...........................................Pg 18

Monitor Menu .........................................Pg 19

Schedule Menu ......................................Pg 20

Miscellaneous Menu ............................. Pg 20

Testing and Troubleshooting ........................Pg 21

Error Messages ...................................... Pg 23

Technical Data .................................................Pg 27

Limited Warranty ............................................Pg 28

User Interface

The 665 uses a Liquid Crystal Display (LCD) as the method of supplying information. You use the LCD in order to setup and monitor the operation of your system. The 665 has four push buttons (Menu, Item, ▲ (Star t), ▼ (Stop)) for selecting and adjusting settings. As you program your control, record your settings in the ADJUST Menu table which is found in the second half of this brochure.

All of the items displayed by the control are organized into various menus. These menus are listed on the left hand side of the display (Menu Field). To select a menu, use the Menu button. By pressing and releasing the Menu button, the display will advance to the next available menu. Once a menu is selected, there will be a group of items that can be viewed within the menu.

Item

The abbreviated name of the selected item will be displayed in the item field of the display. To view the next available item, press and release the Item button. Once you have reached the last available item in a menu, pressing and releasing the Item button will return the display to the first item in the selected menu.

Adjust

To make an adjustment to a setting in the control, begin by selecting the appropriate menu using the Menu button. Then select the desired item using the Item button. Finally, use the ▲ and / or ▼ button to make the adjustment.

Additional information can be gained by observing the Status ﬁ eld of the LCD. The status ﬁ eld will indicate which of the control’s outputs are currently active. Most symbols in the status ﬁ eld are only visible when the VIEW Menu is selected.

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Menu Item

Display

Item Field

Displays an abbreviated name of the selected item

Menu Field

Displays the current menu

Status Field

Displays the current status of the control's inputs, outputs and operation

Number Field

Displays the current value of the selected item

Melt Demand Idle Demand WWSD Water Melting

Buttons

Selects Menus, Items and adjust settings

Symbol Description

Pump

Displays when the system pumps are operating.

Override

Displays when the control is in override mode.

Warning

Displays when an error exists or when a limit has been reached.

Lock / Unlock

Displays when the access levels are locked or unlocked.

Pointer

Displays the control operation as indicated by the text.

°F, °C, min, hr, sec

Units of measurement.

Heat

Displays when the Heat relay is turned on.

Definitions

The following defined terms and symbols are used throughout this manual to bring attention to the presence of hazards of various risk levels, or to important information concerning the life of the product.

- Warning Symbol: Indicates presence of hazards which can cause severe personal injury, death or substantial property damage if ignored.

INSTALLATION

CATEGORY II

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- Double insulated

- Local level, appliances

Sequence of Operation

Section A

General

Operation

Page 4

Section B

Snow

Melting

Page 4 - 5

Section C

Melting Enable

/ Disable

Page 6 - 8

Section D

Melting

Operation

Page 8 - 9

Section E

Idling

Operation

Page 9

Section A: General Operation

POWERING UP THE CONTROL

When the Snow Detector & Melting Control 665 is powered up, the control displays all LCD segments for 2 seconds, then the control type number in the LCD for 2 seconds. Next, the software version is displayed for 2 seconds. Finally, the control enters into the normal operating mode and the LCD defaults to displaying the current outdoor air temperature.

EXERCISING (EXERCISE)

The 665 has a built-in pump exercising function. The exercising period is adjustable and is factory set at 70 hours. If a pump output has not been operated at least once during every exercising period, the control turns on the output for 10 seconds. This minimizes the possibility of a pump or valve seizing during a long period of inactivity.

Note: The exercising function does not work if power to the control or pumps is disconnected.

Section B: Snow Melting

Section B1

General

Snow Melting

Section B1: General Snow Melting

WARM WEATHER SHUT DOWN (WWSD)

The control has a warm weather shut down that prevents the control from entering the melt or idle modes in order to conserve energy. While in WWSD, the word WWSD is displayed in the STATUS item in the VIEW menu and the WWSD pointer is on the display. The WWSD item in the ADJUST menu can be either set to Automatic or it can be set to a temperature.

Automatic (Auto)

When the WWSD is set to AUTO, the WWSD occurs when the slab temperature and the outdoor temperature exceed the Melting setting by 2° F (1°C). The control exits the WWSD when the slab or outdoor temperature falls to the Melting setting temperature.

Adjustable WWSD

When the WWSD is set to a temperature, the WWSD occurs when the outdoor air temperature exceeds the WWSD setting by 1°F (0.5°C) and when the slab temperature exceeds 34°F (1°C). The control exits WWSD when the outdoor air temperature falls 1°F (0.5°C) below the WWSD setting or if the slab temperature falls below 34°F (1°C). This allows the Melting Temperature setting to be set higher than the WWSD. This is useful where high slab temperatures are required to melt the snow or ice. A good example of this is installations using paving bricks on top of sand and concrete layers.

COLD WEATHER CUT OUT (CWCO)

Maintaining the system at either the melting or idling temperature during extremely cold temperatures can be expensive or impossible. The control turns the snow melting system off when the outdoor air temperature drops below the Cold Weather Cut Out (CWCO) temperature. While the control is in CWCO, the word CWCO is displayed in the STATUS item in the VIEW menu. The heater in the sensor is kept on during CWCO until the control detects moisture. If water is detected, the heater is turned off but the control retains the moisture detected information. When the outdoor temperature rises above the CWCO temperature, the control exits CWCO and if the Snow / Ice Sensor 090 detected moisture during CWCO, the control initiates Melting mode. If the control has been started prior to the CWCO, it resumes the Melting mode once the outdoor air temperature rises above the CWCO temperature.

Outdoor

Temperature

WWSD

Control enters

Idle and waits

for Melt Enable

CWCO

Slab Temperature

MELT

IDLE

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RUNNING TIME (RUN TIME)

The running time is the length of time that the system operates once it has reached its slab target temperature. During the time that the system is approaching its slab target temperature, the RUN TIME does not decrease. Once the system reaches its slab target temperature, the RUN TIME begins counting down. When the RUN TIME reaches 0:00 as displayed in the Status item in the VIEW menu, the system has finished melting.

Note: The running time is only applicable when a manual melting enable signal star ts the snow melting system. Refer to Section C1 for a description of a manual melting enable.

STATUS (STATUS)

While in the VIEW menu there are a number of items available to determine the current status of the system. To view the current status of the system, select the STATUS item in the VIEW menu.

• STRT The word STRT is displayed after the snow melting system has been manually enabled. It is displayed until the

zone reaches its slab target temperature. If the zone is at its slab target temperature, STRT is displayed for ﬁ ve seconds after the snow melting system has started operation. This is to verify that the control has entered into the Melting mode.

• STOP The word STOP is displayed for ﬁ ve seconds after the snow melting system has been manually disabled. The

word STOP is also displayed if either a Remote Start / Stop Module 039, Remote Display Module 040 or the Stop on the control stops the snow melting system and an external melt demand is still present.

• IDLE The word IDLE is displayed as long as the zone is operating at its idling temperature.

•

“IDLE” The word IDLE is ﬂ ashed on the display as long as the zone is operating in temporary idle.

• EXT The word EXT is displayed when the RUN TIME has reached 0:00 and the control still has an external melt demand.

In this situation, the zone continues melting until the melt demand is removed or the control is stopped.

• DET The word DET is displayed after the snow melting system has been automatically enabled by the

Snow / Ice Sensor 090 and the zone is at its slab target temperature. DET is also displayed once the control is manually enabled after automatic detection by the 090 and the running time has counted down to 0:00.

• 0:00 to 23:59 hr While the zone is up to temperature and melting, the remaining RUN TIME is displayed.

• INF If an inﬁ nite RUN TIME is selected and the zone is melting, INF is displayed.

• WWSD When the zone is in Warm Weather Shut Down, WWSD is displayed.

• CWCO When the control is in Cold Weather Cut Out, CWCO is displayed.

SNOW MELTING OVERRIDE

If the AWAY setting is selected in the SCHEDULE menu, the snow melting system is shut down. Both the Melting and Idling temperatures are ignored as long as the control remains in the Away mode.

SYSTEM PUMP OPERATION (SYS P1)

The system pump (Sys P1) contact closes and remains closed as long as the system is either in the Melting or Idling mode. The system pump contact shuts off if the control is in CWCO, WWSD, or if there is no call for Melting or Idling.

HEAT CONTAC T OPERATIO N

The control uses the Heat contact to control the temperature of the slab. When the control is either Melting or Idling, the Heat contact operates on a 20 minute cycle. If the slab requires more heat, the on time in each cycle is increased. If the slab requires less heat, the on time of each cycle is decreased. The Heat contact shuts off if the control is in Cold Weather Cut Out (CWCO), Warm Weather Shut Down (WWSD), or if

Relay On Time Relay Oﬀ Time

Cycle (20 minutes)

Relay On Time Relay Oﬀ Time

Less Heat

Relay On Time

More Heat

there is no call for Melting or Idling.

MELTING CONTACT OPERATION

The Melting contact (terminals 13 and 14) closes and remains closed as long as the system is in the melting mode. This contact can be used as an external signal to indicate that the system is currently in the melting mode. This contact can also be used as a means of prioritizing or enabling multiple snow melting controls.

PURGE

The system pump (Sys P1) and zoning device continue to operate for 20 seconds after the last demand is removed. This purges the residual heat from the boiler(s) into the snow melting slab.

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Section C: Melting Enable / Disable

Section C1

Snow Melting

Enable

Section C2

Snow Melting

Disable

Section C1: Snow Melting Enable

The snow melting system can be enabled manually or automatically. A melting enable signal applied to the control places the system into the melting mode. If a melting enable signal is applied once the system is already in the melting mode, the control responds to the last command received.

MANUAL MELTING ENABLE

A manual melting enable signal requires the user to manually start the snow melting system and can be provided from the Start button on the control, Remote Start / Stop Module 039, Remote Display Module 040, or an external melt demand.

Start Button on the Control

The snow melting system is enabled by pressing the Start button on the control while in the VIEW menu. The control then displays the RUN TIME setting to allow the user to adjust it. Once the snow melting system is enabled, the word STRT is displayed for at least 5 seconds in the STATUS item while in the VIEW menu. If the Start button on the control is pressed while the system is already melting and up to temperature, the running time counter is reset to the RUN TIME setting.

Remote Start / Stop Module 039

The snow melting system is enabled by pressing the button on the front of the 039. While the zone is coming up to temperature, a green indicator light flashes on the front of the

039. Once the zone is up to temperature and the RUN TIME is counting down, the green indicator light on the front of the 039 is on solid.

Remote Display Module 040

The snow melting system is enabled by pressing the ▲ button on the 040 while in the VIEW menu. The 040 then displays the RUN TIME setting to allow the user to adjust it. Once the snow melting system is enabled, the word STRT is displayed for at least 5 seconds in the STATUS item while in the VIEW menu.

Start / Stop

StopStart

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External Melt Demand (DIP switch set to Melt Demand)

The snow melting system is enabled when a voltage between 24 and 240 V (ac) is applied across the Melt/Idle Demand terminals (9 and 10). An external melt demand must be present for at least 4 seconds in order to start the snow melting system. If the RUN TIME reaches 0:00 and the external melt demand is still present, the control continues melting until the external melt demand is removed or the system is otherwise stopped.

Note: This operation only occurs if the Idle Demand / Melt Demand DIP switch is set to the Melt Demand position.

AUTOMATIC MELTING ENABLE (Snow / Ice Sensor 090)

The 665 uses the Snow / Ice Sensor 090 to provide an automatic melting enable signal to start the snow melting system. The control continually monitors the 090 for the presence of moisture. Once moisture is detected, the water pointer is displayed in the LCD and the snow melting system is enabled.

Water Detection Sensitivity (SENSTVTY)

The 665 has a Sensitivity setting which compensates for varying outdoor conditions which could affect how the moisture detector in the 090 interprets the presence of moisture. This adjustable setting is available through the SENSTVTY item in the ADJUST menu of the control. As snow becomes contaminated with dirt, and as the sensor itself becomes dirty, the control may incorrectly indicate the presence of water. If this condition occurs, clean the surface of the sensor and / or turn down the SENSTVTY setting. If the snow in your area is very clean, the SENSTVTY setting may need to be increased before snow is detected. If AUTO is selected, the control automatically adjusts the sensitivity level used to detect moisture.

24 to 240 V (ac)

Melt / Idle Demand

Idle Demand

Melt Demand

Section C2: Snow Melting Disable

The snow melting system can be disabled manually or automatically. A melting disable signal applied to the control takes the zone out of the melting mode. Once the snow melting system is disabled, the zone operates in the idling mode. The idling mode allows the zone to be operated at either a lower temperature or turned off.

MANUAL MELTING DISABLE

A manual melting disable signal requires the user to manually stop the snow melting system and can be provided from the Stop button on the control, Remote Start / Stop Module 039, Remote Display Module 040, or an external idle demand.

Stop Button on the Control

The Stop button on the control can be used to stop the snow melting system. The snow melting system is disabled by pressing the Stop button on the control while in the VIEW menu. Once the snow melting system is disabled, the word STOP is displayed for 5 seconds in the STATUS item of the appropriate zone while in the VIEW menu.

Remote Start / Stop Module 039

A Remote Start / Stop Module 039 can be used to stop the snow melting system. The snow melting system is disabled by pressing the button on the face of the 039. When the system is stopped, a solid Red Indicator Light is displayed on the face of the 039 for five seconds. If the snow melting system is disabled while there is still an external melt demand for snow melting, the 039 displays a solid red indicator light until the external demand is removed.

Remote Display Module 040

A Remote Display Module 040 can be used to stop the snow melting system. The snow melting system is disabled by pressing the ▼ button on the 040 while in the VIEW menu. Once the snow melting system is disabled, the word STOP is displayed for 5 seconds in the STATUS item while in the VIEW menu.

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External Idle Demand (DIP switch set to Idle Demand)

The snow melting system is disabled when a voltage between 24 and 240 V (ac) is applied across the Melt/Idle Demand te rmi nal s (9 and 10). A n ex ternal idle demand must be present for at least 4 seconds in order to stop the snow melting system.

Note: This operation only occurs if the Idle Demand / Melt Demand DIP switch is set to the Idle Demand position.

If the snow melting system is placed into Idling mode by an external idle demand, then a manual melting enable signal is applied, the idle demand is overridden until either the running time has expired, a stop signal is given, or the external idle demand is removed and reapplied.

24 to 240 V (ac)

Melt / Idle Demand

Idle Demand

Melt Demand

AUTOMATIC MELTING DISABLE (Snow / Ice Sensor 090)

Once the 090 is dry, the Water pointer turns off in the LCD. The system slab temperature has to be at least the slab target temperature for a minimum of thirty minutes in order for the system to turn off. If a manual melting disable signal is applied the snow melting system turns off immediately.

Section D: Melting Operation

Section D1

General Melting

Operation

Section D1: General Melting Operation

In order for the snow melting system to be started, one of the methods described in section D1 must be used. Once a melting enable signal is applied and the system is not in WWSD or CWCO, the Melting mode begins. When the control is in the Melting mode, the Melting pointer is visible in the VIEW menu. The MELT setting in the ADJUST menu sets the slab surface temperature. When the system is melting and the slab temperature is warming up to the slab target temperature, STRT is displayed in the STATUS item while in the VIEW menu. The system finishes melting when the slab temperature has been at least the slab target temperature for a period of time. This period of time is based on whether an automatic or manual melting enable signal starts the snow melting system.

If an automatic melting enable signal starts the snow melting system and the slab temperature reaches the slab target temperature, DET is displayed in the STATUS item while in the VIEW menu. The system continues to melt until the 090 becomes dry and any additional running time has expired. Once the Melting mode is complete, the system operates in the Idling mode.

If a manual melting enable signal starts the snow melting system, the Running Time is displayed in the STATUS item while in the VIEW menu and begins counting down once the slab temperature reaches the slab target temperature. The system continues to melt until the running time counts down to 0:00 and there is no external melt demand. Once the Melting mode is complete, the system operates in the Idling mode. The table on page 14 describes how the control responds to enable and disable signals.

SLAB TEMPERATURE CONTROL

The 665 uses a snow / ice sensor or slab sensor to provide slab temperature control.

Slab Sensor

If a Slab Sensor is used, the control assumes that the sensor is approximately 1 inch below the surface of the snow melting slab. Since this point is closer to the source of the heat, this point is warmer than the surface of the slab. Therefore, the sensor must be maintained at a higher temperature in order to ensure that the surface of the slab is maintained at the correct temperature. The amount of temperature difference between the surface of the slab and the slab sensor changes with the outdoor temperature. Therefore, the slab core temperature is increased as the outdoor air temperature drops. The temperature displayed as SLAB is the temperature of the slab sensor.

Surface temperature = 35°F

Core (sensor)

is warmer

Slab Outdoor ResetSlab Outdoor Reset

Increasing Slab Core Temperature

Decreasing Air Temperature

Slab Surface Temperature is Constant

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Snow / Ice Sensor 090

The slab temperature is displayed as SLAB in the VIEW menu. This temperature is calculated from the edge and center sensors built into the 090.

SLAB TARGET TEMPERATURE (SLB TRG)

The SLAB TRG temperature is determined from the Melting setting, or Idle setting and the outdoor air temperature. The control displays the temperature that it is currently trying to maintain at the slab sensor. If the control does not presently have a requirement for heat, it displays “– – –“ in the STATUS item while in the VIEW menu.

ADDITIONAL MELTING TIME (ADD MELT)

In cases where areas of the snow melting system haven’t completely melted after the melting mode has finished and the 090 is dry, the 665 has a function in which additional time can be added to melt the zone. This is an adjustable time through the ADD MELT item in the ADJUST menu of the control. The ADD MELT time is calculated into a running time and is displayed in the STATUS item while in the VIEW menu. Once the 090 becomes dry and the slab temperature is at least the slab target temperature, the ADD MELT time starts counting down.

Snow Ice Sensor

Dry

Section E: Idling Operation

Section E1

General Idling

Operation

Section E2

Temporary

Idle

Section E1: General Idling Operation

When the snow melting system starts from a cold temperature, the time required for the system to reach the melting temperature may be excessive. To decrease this start up time, the 665 has an idling feature which can maintain the zone at a lower temperature. This feature is also useful for preventing frost and light ice formation. The IDLING setting in the ADJUST menu sets the slab surface temperature while the control is in the idling mode. When in the idling mode, IDLE is displayed in the STATUS item of the VIEW menu. If idling is not desirable, the IDLING setting may be set to OFF.

Section E2: Temporary Idle (TMPY IDL)

The temporary idle allows the control to enter the idle state for a set amount of time. If the snow ice detector does not detect snow during the temporary idle period, the control then leaves the idle state and returns to the OFF state. This is useful in applications where there is the possibility of snow and the slab can be pre-heated in order to have a short heat up time if snow is detected.

To enable a temporary idle, the Te m p o r a r y I d l e setting in the ADJUST menu must be set from OFF to the length of the temporary idle. The DIP Switch must be set to IDLE DEMAND and the IDLING must be set to a temperature. To activate a temporary idle, a voltage between 24 and 240 V (ac) must be applied across the Melt/Idle Demand terminals for at least 4 seconds.

When a Tem p orar y I d l e time is selected, the control has three available states: OFF, Temporary Idle, and Melting. The table below describes the action of the control:

Control State Action Result

OFF External Idle Demand Temporary Idle

OFF Manual or Auto Melt Start Melting

Melting External Idle Demand Melting

Melting Manual or Auto Melt Start Melting

Melting Manual or Auto Melt Stop OFF

Temporary Idle Temporary Idle Expires OFF

Temporary Idle Manual or Auto Melt Start Melting

Temporary Idle Manual Melt Stop OFF

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+ 19 hidden pages