Tekmar 521 Programmable Thermostat Specification Sheet

Tekmar 521 Programmable Thermostat

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.

PRODUCT OVERVIEW

Specifications

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

• 7 Day Programmable Schedule

Additional Features

• Optimum Start
• Permanent Temperature Hold
• Radiant Floor Heating
• Two Stage Heating
• Cooling
• Fan
• Backlight
• Outdoor and Floor Temperature Display
• Time Clock
• Four Hour Battery-free Clock Backup

Scan code for quick link to product page on tekmarControls.com

SPECIAL REQUIREMENTS
An auxiliary sensor must be used to measure any auxiliary sensor temperatures.

Sample Application Drawing

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.

Sample Mechanical diagram

Legend

• P1 = Manifold Pump
• S1 = Optional Slab Sensor 079
• T1 = 24 V (ac) Transformer 009
• Z1 = Zone Valve

Sample Electrical diagram

All specifications are subject to change without notice

Tel: (250) 545-7749 • Fax: (250) 984-0815
tekmarControls.com

Other  Manual:

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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