- Data Brochure D 665 Snow Detector & Melting Control 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.
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) Troubleshooting. 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.
Display Number Field Displays the current value of the selected item Item Field Displays an abbreviated name of the selected item Melt Demand Idle Demand WWSD Water Melting Menu Field Displays the current menu Status Field Displays the current status of the control's inputs, outputs and operation Buttons Selects Menus, Items and adjust settings Symbol Description Pump Displays when operating. the system pumps are Pointer Displays the control operation as indicated by the text.
Sequence of Operation Section A Section B Section C Section D Section E General Operation Page 4 Snow Melting Page 4 - 5 Melting Enable / Disable Page 6 - 8 Melting Operation Page 8 - 9 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.
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.
Section C: Melting Enable / Disable Section C1 Section C2 Snow Melting Enable 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.
9 10 Melt / Idle Demand 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.
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 terminals (9 and 10). An external 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.
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.
Installation 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 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. Do not open the control. Refer to qualified personnel for servicing.
The wiring can enter the bottom or the back of the enclosure. Knock-outs provided in the base allow the wiring to be run in conduit up to the enclosure. The base also has holes that line up with the mounting holes of most common electrical boxes. The control can be mounted on a standard DIN rail. First remove the control from its base and then, using the hooks and spring clip on the back of the control, mount it onto the DIN rail.
Wiring the Outdoor Sensor Connect 18 AWG or similar wire to the two terminals provided in the enclosure and run the wires from the sensor to the control. Do not run the wires parallel to telephone or power cables. If the sensor wires are located in an area with strong sources of electromagnetic interference (EMI), shielded cable or twisted pair should be used or the wires can be run in a grounded metal conduit.
Melt / Idle Demand 9 10 To generate a melt demand or idle demand, a voltage between 24 V (ac) and 240 V (ac) must be applied across the Melt / Idle Demand terminals (9 and 10). Melt / Idle Demand 24 to 240 V (ac) L N Output Connections System Pump Contact (Sys P1) The Sys P1 output terminal (15) on the 665 is a powered output. When the relay in the 665 closes, 115 V (ac) is provided to the Sys P1 terminal (15) from the Power L terminal (16).
tekmarNet ® (tN2) Device 7 8 A Remote Display Module (RDM) 040 or Remote Start / Stop Module 039 can be connected to the tekmarNet® (tN2) input. Connect the Com terminal from the appropriate tN2 device to the Com terminal (7) on the 665. Connect the tN2 terminal from the appropriate tN2 device to the tN2 terminal (8) on the 665. 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.
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 (16 and 17) using an AC voltmeter, the reading should be between 103.5 and 126.5 V (ac). 16 17 V 103.5 to 126.
Cleaning The control’s exterior can be cleaned using a damp cloth. Moisten cloth with water and wring out prior to wiping control. Do no use solvents or cleaning solutions. DIP Switch Settings The DIP switch settings on the control are very important and should be set to the appropriate settings prior to making any adjustments to the control through the User Interface. The DIP switch settings change the items that are available to be viewed and / or adjusted in the User Interface.
665 View Menu (1 of 1) Se ct LT ion D U S IN ER S AD T V Item Field Access Level Description Range Outdoor Current outdoor air temperature as measured by the outdoor sensor. -67 to 149°F (-55 to 65°C) D1 Slab Target Slab sensor target temperature. – – –, 20 to 110°F (– – –, -7 to 43°C) D1 Slab Current slab sensor temperature. -58 to 167°F (-50 to 75°C) Status Operating status.
665 Adjust Menu (1 of 1) Access Level © 2012 Se ct LT ion D U SE IN R S AD T V Item Field Description Range B1 Run Time The time for which a zone is operated once it has reached its melting temperature. This item cannot be viewed if a Remote Start / Stop Module 039 has been connected. 0:30 to 17:00 hr, INF (Infinity) Default = 4:00 hr D1 Add Melt The additional time for which a zone is operated once the Snow / Ice Sensor 090 becomes dry.
665 Monitor Menu (1 of 1) Note: To clear the recorded information in the specific item field, press and hold ▲ and ▼. Description Range LT D U SE IN R S AD T V Item Field Access Level Outdoor High The highest recorded outdoor air temperature since this item was last cleared. -67 to 149°F (-55 to 65°C) Outdoor Low The lowest recorded outdoor air temperature since this item was last cleared.
665 Schd (Schedule) Menu (1 of 1) Access Level Se ct LT ion D U SE IN R S AD T V Item Field Description Range Override The setback override that is in effect for the snow NONE, AWAY (Ovr) melting system. Default = NONE B1 665 Misc (Miscellaneous) Menu (1 of 1) Description Range LT D U SE IN R S AD T V Item Field Access Level © 2012 D 665 - 04/12 Units The units of measure that all of the temperatures are to be displayed in by the control.
Testing the Control The Snow Detector & Melting Control 665 has a built-in test routine which is used to test the main control functions. The 665 continually monitors the sensors and displays an error message whenever a fault is found. See the following pages for a list of the 665’s error messages and possible causes. When the Test button is pressed, the test light is turned on. The individual outputs and relays are tested in the following test sequence.
Troubleshooting When troubleshooting any heating system, it is always a good idea to establish a set routine to follow. By following a consistent routine, many hours of potential headaches can be avoided. Below is an example of a sequence that can be used when diagnosing or troubleshooting problems in a hydronic heating system. Establish the Problem Establish the problem. Get as much information from the customer as possible about the problem.
665 Error Messages (1 of 2) 665 Error Messages (1 of 2) Error Displayed Description of Error The control was unable to store a piece of information into its EEPROM. This error can be caused by a noisy power source. The control will display the error message and will continue to operate as normal. Pressing either the Menu or Item button will clear this error. The control was unable to read a piece of information stored in the ADJUST menu.
665 Error Messages (2 of 2) Error Displayed Description of Error The control is no longer able to read the slab sensor due to an open circuit. In this case, if the control is currently in the Melting mode, the control will turn off the Heat relay. Locate and repair the problem as described in the Data Brochure supplied with the sensor. To clear the error message from the control after the sensor has been repaired, press either the Menu or Item button.
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Notes Sensor Technical Data Outdoor Sensor 070 Literature Packaged weight Dimensions Enclosure Approvals Operating range Sensor Warranty D070, C070 0.4 lb. (180 g) 4-1/2” H x 2-7/8” W x 1-1/2” D (73 x 114 x 38 mm) White PVC plastic, NEMA type 2 CSA C US -60 to 140°F (-51 to 60°C) NTC thermistor, 10 kΩ @ 77°F (25°C ±0.
Technical Data Snow Detector & Melting Control 665 Pulse Width Modulation Power supply Relay capacity Demand Sensors –Included –Optional Warranty Idle Demand Melt Demand Idle Demand Melt Demand WWSD Water Test Melting off red red not testing testing testing paused For maximum heat, press and hold Test button for 3 seconds Menu Item Meets Class B: Canadian ICES FCC Part 15 900-03 Designed and assembled in Canada by tekmar Control Systems Ltd.
