- Data Brochure D 664 Snow Detector & Melting Control 664 07/09 The Snow Detector and Melting Control 664 is designed to control up to two zones in a snow melting system. The control automatically adjusts the mixed supply water to the snow melting system by controlling up to two boilers and a single mixing device. For mixing, the 664 can use a variable speed injection pump, a floating action mixing valve or a 4-20 mA device.
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 6 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 Minimum Maximum 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 Open / Close Displays when the actuator is opening or closing the mixing valve.
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.
MIXING TARGET (MIX TRG) The mixing target temperature is the supply fluid temperature calculated by the control. The control will operate the snow melt system so that the mix supply temperature reaches the mixing target except while providing boiler return protection for the boiler. MIXING MAXIMUM (MIX MAX) The Mix Max sets the highest fluid temperature that the control is allowed to calculate as the mixing target temperature.
SOFT START When the control starts applying heat to the slab, the supply temperature to the snow melting system is ramped up over a period of time until it reaches the target mixed supply temperature. This feature helps reduce thermal stresses in the slab. Note: This operation only occurs if the Boil SENS item is set to RET or NONE. RUNNING TIME (RUN TIME) The running time is the length of time that a zone operates once it has reached its slab target temperature.
• 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 infinite RUN TIME is selected and the zone is melting, INF is displayed.
STAGING The 664 controls up to two stages in order to supply the required temperature. After the first stage is turned on in the firing sequence, the control waits a minimum amount of time before turning on the next stage. After the minimum time delay between stages has expired, the 664 examines the control error to determine when the next stage is to fire. The control error is determined using Proportional, Integral and Derivative (PID) logic.
ROTATION (ROTATE) The ROTATE item is an adjustable setting that is factory set at 48 hours. The firing order of the boiler changes whenever one stage’s accumulated running time exceeds the other stage’s accumulated running time by more than the ROTATE setting. After each rotation, the stage with the least running hours is the first to fire and the stage with the most running hours is the last to fire. This function ensures that both stages receive equal amounts of use.
Remote Start / Stop Module 039 The snow melting system is enabled by pressing the button on the front of the 039. While the zone(s) is coming up to temperature, a green indicator light flashes on the front of the 039. Once the zone(s) is up to temperature and the RUN TIME is counting down, the green indicator light on the front of the 039 is on solid. 7 8 9 Start / Stop Remote Display Module 040 The snow melting system is enabled by pressing the ▲ button on the 040 while in the VIEW menu.
Section D2: Snow Melting Disable The snow melting system can be disabled manually or automatically. A melting disable signal applied to the control takes both zones out of the Melting mode. Once the snow melting system is disabled, the zone(s) operates in the Idling mode. The Idling mode allows the zone(s) to be either operated at a lower temperature or turned off.
Section E: Melting Operation Section E1 General Melting Operation Section E1: General Melting Operation The Snow Detector and Melting Control 664 provides up to two zones of snow melting. 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 zone(s) is not in WWSD or the system is not in CWCO, the Melting mode begins.
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 664 has a function in which additional time can be added to melt the zone(s). 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 of the appropriate zone while in the VIEW menu.
Section F: Idling Operation Section F1 Section F2 General Idling Operation Temporary Idle Section F1: General Idling Operation When the snow melting system starts from a cold temperature, the time required for the zone(s) to reach its melting temperature may be excessive. To decrease this start up time, the 664 has an idling feature which can maintain the zone(s) at a lower temperature. This feature is also useful for preventing frost and light ice formation.
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.
19 20 Melt / Idle Demand Melt / Idle Demand To generate a melt demand or idle demand, a voltage between 24 V (ac) and 230 V (ac) must be applied across the Melt / Idle Demand terminals (19 and 20). 24 to 230 V (ac) L N Output Connections Boiler Contacts 21 22 23 ge24 The Stage 1 and Stage 2 terminals (21, 22 and 23, 24) are isolated outputs in the 664. There is no power available on these terminals from the control. These terminals are used as a switch to either make or break the boiler circuit.
Mixing Valve Actuator If a mixing valve is used, connect one side of the 24 V (ac) power to the Pwr Mix terminal (4) on the control. The output relay Opn / Var (3) is then connected to the open terminal of the actuating motor and the output relay Cls (5) is connected to the close terminal of the actuating motor. Connect the second side of the 24 V (ac) circuit to the common terminal of the actuating motor.
EITHER: Snow / Ice Sensor 090 (Zone 1) 6 7 8 9 10 If a Snow / Ice Sensor 090 is used, connect the red wire from the sensor cable to the Red terminal (6), connect the black wire from the sensor cable to the Blk / Com terminal (7), connect the blue wire from the sensor cable to the Blu terminal (8), connect the yellow wire from the sensor cable to the Yel terminal (9) and connect the brown wire from the sensor cable to the Brn / Slab1 terminal (10).
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 (29 and 30) using an AC voltmeter, the reading should be between 103.5 and 126.5 V (ac). 29 30 V 103.5 to 126.
4–20 mA Device The 4–20 mA output terminals (1 and 2) can not be tested without power applied to the control. Since no power is supplied to the control at this point, the 4–20 mA output cannot be tested. Please refer to the operation test below. Connecting The Control 5 1 2 3 4 Make sure all power to the devices and terminal blocks is off, and remove any remaining jumpers from the terminals.
Access Levels The tekmar Snow Detector and Melting Control 664 comes with four Access Level settings. These Access Levels restrict the number of Menus, Items and Adjustments that can be accessed by the user. The four access levels are Limited (LTD), User (USER), Installer (INST) and Advanced (ADV). The access level of the control is found in the Miscellaneous (Misc) menu when the Lock / Unlock DIP switch is set to the Unlocked position.
664 View Menu (1 of 2) Access Level © 2009 Se ct LT ion D U SE IN R S AD T V Item Field Description Range Outdoor Current outdoor air temperature as measured by the outdoor sensor. -67 to 149°F (-55 to 65°C) E1 Slab 1 Target Slab sensor target temperature of zone 1. ZONE 1 = AUTO – – –, -58 to 167°F (– – –, -50 to 75°C) E1 Slab 1 Current slab sensor temperature of zone 1. ZONE 1 = AUTO -58 to 167°F (-50 to 75°C) B1 Status 1 Operating status of Zone 1.
664 View Menu (2 of 2) Se ct LT ion D U SE IN R S AD T V Item Field Access Level Description Range A C1 Boil Supply Current boiler supply water temperature as measured by the boiler sensor. Boil SENS = SUP -31 to 266°F (-35 to 130°C) A C2 Boil Return Current boiler return water temperature as measured by the boiler sensor.
664 Adjust Menu (2 of 3) Access Level Description Range E1 Melt 2 The desired slab surface temperature of zone 2 while in the Melting mode. Zone 2 = AUTO 32 to 95°F (0 to 35°C) Default = 36°F (2°C) F1 Idle 2 The desired slab surface temperature of zone 2 while in the Idling Mode. Zone 2 = AUTO, PRIORITY = NONE OFF, 20 to 95°F (OFF, -7 to 35°C) Default = OFF Temporary Idle Time for which the temporary idle is active. OFF, 0:30 to 40:00 hr Default = OFF B WWSD Warm Weather Shut Down.
664 Adjust Menu (3 of 3) Se ct LT ion D U SE IN R S AD T V Item Field Access Level Description Range B1 ΔT Maximum The maximum ΔT for the snow melting system. PRIORITY ≠ NONE 10 to 70°F, OFF (5 to 39°C, OFF) Default = OFF C1 Differential The differential for the snow melting system. Boil SENS = SUP AUTO, 2 to 42°F (AUTO, 1 to 23°C) Default = AUTO A C1 Boiler Minimum The minimum temperature allowed for the boiler target temperature.
664 Monitor Menu (1 of 2) Note: To clear the recorded information in the specific item field, press and hold ▲ and ▼. Access Level Description Range LT D U SE IN R S AD T V Item Field © 2009 D 664 - 07/09 Outdoor High The highest recorded outdoor air temperature since this item was last cleared. -85 to 170°F (-65 to 77°C) Outdoor Low The lowest recorded outdoor air temperature since this item was last cleared.
664 Monitor Menu (2 of 2) 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 Boiler 1 Fire The total number of running hours for Stage 1 since this item was last cleared. This total time does not include the Fire Dly time set in the ADJUST menu. Boil SENS = SUP 0 to 9999 hr Boiler 1 Cycle The total number of firing cycles that Stage 1 has had since this item was last cleared.
664 Schd (Schedule) Menu (1 of 1) Access Level Description Range LT D U SE IN R S AD T V Item Field Override The setback override that is in effect for the snow NONE, AWAY (Ovr) melting system. Default = NONE 664 Misc (Miscellaneous) Menu (1 of 1) Access Level Description Range LT D U SE IN R S AD T V Item Field © 2009 D 664 - 07/09 Units The units of measure that all of the temperatures are to be displayed in by the control.
Testing the Control The Snow Detector and Melting Control 664 has a built-in test routine which is used to test the main control functions. The 664 continually monitors the sensors and displays an error message whenever a fault is found. See the following pages for a list of the 664’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.
664 Error Messages (1 of 3) 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.
664 Error Messages (2 of 3) Error Displayed Description of Error The control is no longer able to read the mixing supply sensor due to an open circuit. In this case, the control does not operate the snow melting system. Locate and repair the problem as described in the Data Brochure D 070. To clear the error message from the control after the sensor has been repaired, press either the Menu or Item button. The control is no longer able to read the mixing return sensor due to a short circuit.
664 Error Messages (3 of 3) Error Displayed Description of Error The control is no longer able to read the water detection circuit due to an open circuit. In this case, if the control is currently in the Melting mode, the control will finish the snow melting cycle. The snow melting system can only be operated using an external melt demand, Remote Display Module 040, Remote Start / Stop Module 039 or the Start button on the control. Otherwise, the control will operate as if the Snow / Ice Sensor 090 is dry.
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Notes 35 of 36 © 2009 D 664 - 07/09
Technical Data Snow Detector & Melting Control 664 Two Zone, Two Stage Boiler, Mixing D 664, A 664’s, D 001, D 070, E 021, U 664. Microprocessor PID control; This is not a safety (limit) control. 3.5 lb. (1600 g), Enclosure A, blue PVC plastic 6-5/8” H x 7-9/16” W x 2-13/16” D (170 x 193 x 72 mm) CSA C US, CSA 22.2 No 24 and UL 873, meets class B: ICES & FCC Part 15. Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH noncondensing.
