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.
| Programmable Thermostat 521 Two Heat or Heat-Cool (Includes Sensor 079) | |
| Literature | 521_A, 521_C, 521_D, 521_Q, 521_U |
| Control | Microprocessor control. This is not a safety (limit) control |
| Packaged weight | 0.6 lb. (290 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, CE |
| 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, Class 2 |
| Relays | 30 V (ac/dc) 2 A, Class 2 circuits |
| Sensor | NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 |
| –Included | Slab Sensor 079 |
| –Optional | tekmar type # 070, 072, 073, 076, 077, 079, 084 |
| Warranty | Limited 3 Year (See 521_D for full warranty) |
| Slab Sensor 079 10’ (3 m) wire | |
| Dimensions | 3/16” OD x 1-1/2” (5 mm OD x 38 mm) |
| Enclosure | 316 stainless steel, 10’ (3 m) 24 AWG, 300 volt PVC insulated Zipcord |
| Operating range | -58 to 221°F (-50 to 105°C) |
| Sensor | NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 |
Energy Saving Features
Additional Features
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SPECIAL REQUIREMENTS
An auxiliary sensor must be used to measure any auxiliary sensor temperatures.
Below is a sample application drawing for this product. This application may include other tekmar products that are required for installation. More sample applications can be found at tekmarControls.com.
Legend
Sample Electrical diagram
All specifications are subject to change without notice
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tekmarControls.com
Tekmar 521 Programmable Thermostat Quick Set-up Guide
Tekmar 521 Programmable Thermostat User Manual
Tekmar 521 Programmable Thermostat Installation and Operation Manual
Tekmar 521 Programmable Thermostat Specification Sheet
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