The Thermostat 518 accurately controls the room temperature for a hydronic heating zone using Pulse Width Modulation (PWM) technology. Simple up and down buttons and a display with large type make this thermostat easy to read and use. The 518 automatically detects a single auxiliary sensor to measure either outdoor, floor, or remote room temperature. This easy-to-install thermostat is a direct replacement for tekmar Thermostats 507 and 508.
Energy Saving Features
Auto Heating Cycle
Additional Features
Congratulations on the purchase of your new tekmar® thermostat. This manual will step through the complete installation, programming and sequence of operation for this control. At the back, there are tips for control and system troubleshooting.
Caution
Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury or death. 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.
Tools Required
Materials Required
Installation Location
Choose the placement of the thermostats early in the construction process to enable proper wiring during rough-in.
Consider the following:
To remove the thermostat base:
If a single gang box is used:
If mounting directly to the wall:
Testing the Power
If the thermostat display turns on, this indicates that the thermostat is operating correctly and there are no electrical issues. In the event that the display is permanently off:
Testing the Heat Zone Output Wiring
Symbols Description | ||
HEAT ON The heat is turned on. | MIN The floor is at or below the floor minimum temperature. | |
MODE OFF The heating system is off. | ||
MAX The floor has reached the floor maximum temperature. | ||
WARNING SYMBOL Indicates an error is present. |
To change the heat temperature setting, push the or button to select a preferred temperature setting. The Heat On symbol is shown on the display when the thermostat is heating. The heat can cycle on and off within +/- 1.5°F (1°C) of the temperature setting. The floor and air heating can be shut off by holding the button until Set Room is Off. To resume heating when the Mode is Off, press the button to navigate to the Mode setting, then press the button to select Mode Heat. The thermostat will resume heating at the last previously set temperature.
Display | Setting |
User settings. | |
MODE Select heat or off. | |
| UNITS Select the temperature units in degrees Fahrenheit or Celsius. |
BACKLIGHTSelect when the display backlight should operate. Options are Off Auto, and On. Auto operates the backlight for 30 seconds after a keystroke. | |
SET FLOORSet the floor minimum temperature. Available when an auxiliary floor sensor is connected and the built-in room temperature sensor is on. | |
TYPEDevice Type number. Hold the button to view the software version. | |
ESCAPERelease the |
Display | Setting |
Installer settings. Press the | |
AUXILIARY SENSORSelect the type of auxiliary sensor. Available when an auxiliary sensor is automatically detected. NONE = no auxiliary sensor, ROOM = Indoor Sensor, OUT = Outdoor Sensor, FLOR = Slab Sensor | |
ROOM SENSORSelect if the built-in room temperature sensor is on or off. The built-in room sensor can only be disabled when an auxiliary room or slab sensor is connected. | |
FLOOR MAXIMUMSet the floor maximum temperature in order to protect the floor covering. Suggested settings: Tile = 90°F (32°C), Wood Floor = 85°F (29°C) | |
ESCAPERelease the |
Error Message | Description |
SETUP MENU SAVE ERROR The thermostat failed to read the Programmable Settings from memory and has reloaded the factory default settings. The thermostat stops normal operation until all Programmable Settings are checked except to provide freeze protection. | |
| ROOM SENSOR OPEN CIRCUIT ERROR The built-in air temperature sensor has an open circuit fault. Do not confuse this error with the auxiliary room sensor short circuit error. This error cannot be field repaired. Contact your wholesaler or tekmar sales representative for details on repair procedures. |
ROOM SENSOR SHORT CIRCUIT ERROR The built-in air temperature sensor has a short circuit fault. Do not confuse this error with the auxiliary room sensor short circuit error. This error cannot be field repaired. Contact your wholesaler or tekmar sales representative for details on repair procedures. | |
| AUXILIARY SENSOR OPEN CIRCUIT ERROR The auxiliary sensor has an open circuit. Check for loose or damaged wires. Locate and repair the problem as described in the sensor Installation & Operation Manual (070_D, 079_D). The error clears once the auxiliary sensor fault is corrected. If the auxiliary sensor was intentionally removed, power the thermostat down and up to clear the error. |
AUXILIARY SENSOR SHORT CIRCUIT ERROR The auxiliary sensor has a short circuit. Check for damaged wires. Locate and repair the problem as described in the sensor Installation & Operation Manual (070_D, 079_D). The error clears after the auxiliary sensor fault is corrected. |
Symptom | Look for… | Corrective Action |
Display powering on and off. | Measure voltage at wiring terminals R and C. | The power supply transformer may have limited VA capacity. A transformer with a larger VA rating is recommended. |
The thermostat does not heat. | Mode Off | The thermostat must be in Mode Heat in order to provide heating. |
Thermostat 518 One-Stage Heat | |
Literature | 518_C, 518_D, 518_Q, 518_U |
Control | Microprocessor control. This is not a safety (limit) control |
Packaged weight | 0.53 lb. (240 g) |
Dimensions | 3-11/16” H x 3” W x 15/16” D (94 x 76 x 24 mm) |
Enclosure | White PVC plastic, NEMA Type 1 |
Approvals | Meets Class B: ICES & FCC Part 15 |
Ambient conditions | Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing |
Power supply | 10 to 30 V (ac/dc), 50/60 Hz, 1.8 VA standby, 56 VA max fully loaded, Class 2 |
Relay | 30 V (ac/dc) 2 A, Class 2 circuits |
Sensor | NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 |
– Included | None |
– Optional | tekmar type # 070, 072, 073, 076, 077, 079, 084 |
Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at the time of such Product sale and acknowledges that it has read and understands same. The tekmar Limited Warranty to the Purchaser on the Products sold hereunder is a manufacturer’s passthrough warranty which the Purchaser is authorized to pass through to its customers. Under the Limited Warranty, each tekmar Product is warranted against defects in workmanship and materials if the Product is installed and used in compliance with tekmar’s instructions, ordinary wear and tear excepted. The passthrough warranty period is for a period of twenty-four (24) months from the production date if the Product is not installed during that period, or twelve (12) months from the documented date of installation if installed within twenty-four (24) months from the production date.
The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s sole discretion: the cost of parts and labor provided by tekmar to repair defects in materials and/or workmanship of the defective product; or to the exchange of the defective product for a warranty replacement product; or to the granting of credit limited to the original cost of the defective product, and such repair, exchange or credit shall be the sole remedy available from tekmar, and, without limiting the foregoing in any way, tekmar is not responsible, in contract, tort or strict product liability, for any other losses, costs, expenses, inconveniences, or damages, whether direct, indirect, special, secondary, incidental or consequential, arising from ownership or use of the product, or from defects in workmanship or materials, including any liability for fundamental breach of contract. The pass-through Limited Warranty applies only to those defective Products returned to tekmar during the warranty period. This Limited Warranty does not cover the cost of the parts or labor to remove or transport the defective Product, or to reinstall the repaired or replacement Product, all such costs and expenses being subject to Purchaser’s agreement and warranty with its customers.
Any representations or warranties about the Products made by Purchaser to its customers which are different from or in excess of the tekmar Limited Warranty are the Purchaser’s sole responsibility and obligation. Purchaser shall indemnify and hold tekmar harmless from and against any and all claims, liabilities, and damages of any kind or nature which arise out of or are related to any such representations or warranties by Purchaser to its customers.
The pass-through Limited Warranty does not apply if the returned Product has been damaged by negligence by persons other than tekmar, accident, fire, Act of God, abuse or misuse; or has been damaged by modifications, alterations or attachments made subsequent to purchase which have not been authorized by tekmar; or if the Product was not installed in compliance with tekmar’s instructions and/or the local codes and ordinances; or if due to defective installation of the Product; or if the Product was not used in compliance with tekmar’s instructions. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, WHICH THE GOVERNING LAW ALLOWS PARTIES TO CONTRACTUALLY EXCLUDE, INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURABILITY OR DESCRIPTION OF THE PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS OR TRADEMARKS, AND ITS COMPLIANCE WITH OR NON-VIOLATION OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR SAFETY LEGISLATION; THE TERM OF ANY OTHER WARRANTY NOT HEREBY CONTRACTUALLY EXCLUDED IS LIMITED SUCH THAT IT SHALL NOT EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUCTION DATE TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY THE GOVERNING LAW.
Product Warranty Return Procedure
All Products that are believed to have defects in workmanship or materials must be returned, together with a written description of the defect, to the tekmar Representative assigned to the territory in which such Product is located. If tekmar receives an inquiry from someone other than a tekmar Representative, including an inquiry from Purchaser (if not a tekmar Representative) or Purchaser’s customers, regarding a potential warranty claim, tekmar’s sole obligation shall be to provide the address and other contact information regarding the appropriate Representative.
Tekmar 518 Thermostat Installation and Operation Manual
Other Manual:
Tekmar 518 Thermostat Quick Set-up Guide
Tekmar 518 Thermostat User Manual
Tekmar 518 Thermostat Specification Sheet
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