Application Guide

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A - 10/16 20 of 20 © 2016 tekmar
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All specications are subject to change without notice
Specifications
The following are the recommended specifications for the WiFi Snow Melting Control 670.
•
The control shall communicate with the Internet Cloud to provide remote starting, stopping and monitoring through an Android
or Apple iOS mobile application or through a web browser.
• The control shall have the ability to use a snow/ice sensor in order to automatically detect snow or ice and begin operation
of the system. The system shall continue to run until the sensor is dry or the control is manually stopped.
• The control shall communicate with an Internet weather service to determine the local snow fall forecast and automatically
pre-heat the slab for an adjustable timed duration.
• The control shall have the ability to be manually started with an adjustable running time that counts down and automatically
stops the system.
•
The control shall not operate the system to provide heat to the snow melting zones when it enters into either a Warm Weather
Shut Down (WWSD) or a Cold Weather Cut Off (CWCO) mode.
• The system water temperature shall be based on the outdoor temperature and feedback from sensors located in the snow
melting slabs.
• The control shall have the option to mix the supply water temperature using a mixing valve with a floating action, 0-10 V (dc)
or a 4-20 mA actuator motor, or using a variable-speed injection mixing pump.
•
The control shall have an adjustable minimum return water temperature setting to help prevent condensation of flue gases
and subsequent corrosion and blockage of the boiler’s heat exchanger and chimney.
•
The control shall have the ability to limit the amount of cool water being returned to the boiler through the mixing device in
order to prevent low boiler operating temperatures and flue gas condensation.
• The control shall have the ability to directly control the supply temperature of a modulating boiler, a one or two-stage boiler,
or to send a boiler enable signal to another boiler operating control to allow for a staging control to be connected.
• The control shall have the option of an automatic differential calculation for the operation of one or two boiler stages in order
to prevent short cycling.
• The control shall use proportional, integral and derivative (PID) logic when modulating or staging boiler stages.
• The control shall have the option to limit the heat up rate of the slab to help prevent cracking the concrete.
• The control shall have two separate lockable access levels to limit the number of adjustments available to various users.
• The control shall have a manual override that allows each output to be manually turned on or off.
•
The control shall continuously monitor its temperature sensors and provide an error message upon a control or sensor failure.
• The control shall record and display boiler and pump running hours and minimum and maximum temperatures depending
on the access level that has been selected.
• During extended periods of inactivity, the pumps and valves that are operated by the control shall be periodically exercised
to prevent seizure during long idle periods.
This Application Brochure is not intended to provide full installation instructions and safety information. In order to avoid property
damage or injury, please refer to the complete installation manual and product safety information provided with the product.