Specification
Job __________________________
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Thermostat 518
518
_
C
03/13
Zoning
Replaces: New
Submittal
© 2013 518_C - 03/13
1 of 2
A Watts Water Technologies Company
Energy Saving Features
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Auto Heating Cycle
Additional Features
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Radiant Floor Heating
Pulse Width Modulation
Auxiliary Sensor Input
Outdoor & Floor Temperature Display
Backlight
Freeze Protection
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Specifications
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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.
SPECIAL REQUIREMENTS
An auxiliary sensor must be used to measure any auxiliary sensor temperatures.
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
Warranty Limited 3 Year (See 518_D for full warranty)
Mounting Base
Front View
Side View
C
518
R Rh W1 S1 Com
No Power
3–11/16”
(94 mm)
3”
(76 mm)
15/16”
(24 mm)
9/16”
(15 mm)
2-13/16”
(72 mm)
1–3/16”
(30 mm)
2–3/8”
(60 mm)
3–9/16”
(90 mm)
9/16”
(14 mm)
2-5/16” (60 mm)
2-1/16” (53 mm)
Scan code for quick
link to product page on
tekmarControls.com