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Tekmar 518 Installation & Operation Manual

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Made by: Tekmar
Type: Installation & Operation Manual
Category: Thermostat
Pages: 12
Size: 1.54 MB

 

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Thermostat 518

Installation & Operation Manual

518_D

03/13

Zoning

Replaces: New

© 2013 

 518_D - 03/13

1 of 12

A Watts Water Technologies Company

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.

Introduction

Energy Saving Features

Auto Heating Cycle

Additional Features

Radiant Floor Heating
Pulse Width Modulation
Auxiliary Sensor Input
Outdoor & Floor Temperature 
Display
Backlight
Freeze Protection





 


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© 2013 

 518_D - 03/13

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A Watts Water Technologies Company

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.

Getting Started

Preparation

Installation

Table of Contents

Getting Started ...............................2

Installation ...........................................2

Preparation .....................................2
Removing The Thermostat Base ....3
Mounting The Thermostat...............4
Thermostat Wiring ..........................5
Testing the Thermostat Wiring ........6

User Interface ......................................7

Home Screen ..................................7
Symbols Description .......................7

Sequence of Operation ........................8

Heating Operation ...........................8

Programmable Settings .......................9

Troubleshooting .................................10

Error Messages ............................10
Frequently Asked Questions ........ 11
Technical Data .............................. 11
Limited Warranty and Product 
Return Procedure .........................12

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.

Caution

tekmar or jeweller screwdriver
Phillips head screwdriver


Wire Stripper

Tools Required

 ------------------------------------------------------

 ------------------------------------------------------

 


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A Watts Water Technologies Company

Choose the placement of the thermostats early in the construction process to enable 
proper wiring during rough-in.

Consider the following:

Interior Wall.
Keep dry. Avoid potential leakage onto the control.
Relative Humidity less than 90%. Non-condensing environment.
No exposure to extreme temperatures beyond 32-122°F (0-50°C).
No draft, direct sun, or other cause for inaccurate temperature readings.
Away from equipment, appliances, or other sources of electrical interference.
Easy access for wiring, viewing, and adjusting the display screen.
Approximately 5 feet (1.5 m) off the finished floor.
The maximum length of wire is 500 feet (150 m).
Strip wire to 3/8” (10 mm) for all terminal connections.
Use standard 4 conductor, 18 AWG wire.











Installation Location

 -------------------------------------------------

 -------------------------------------------------

Materials Required

 --------------------------------------------------

 --------------------------------------------------

18 AWG LVT Solid Wire 
(Low Voltage Connections)

Removing The Thermostat Base

To remove the thermostat base:

Locate the tab on the bottom of the 
thermostat.
Push the tab with either your thumb or with 
a screwdriver.
Lift the thermostat front away from the 
thermostat’s base.

 


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Mounting The Thermostat

Wall

Thermostat

Front

Thermostat

Base

If mounting directly to the wall:

Drill holes and install the wall anchors.
Feed the wiring through the large hole in the thermostat base.
Fasten the thermostat base to the wall using the wood screws to the wall 
anchors.
Terminate wiring to the wiring strip.
Push the thermostat front onto the thermostat base.




1

/

4

(83 mm)

Stud

Gang
Box

Thermostat

Front

Thermostat

Base

Adapter Plate 012

If a single gang box is used:

Adapter Plate 012 is required (sold separately).
Feed the wiring through the hole in the adaptor plate and the thermostat base.
Fasten the adaptor plate to the gang box.
Fasten the base of the thermostat to the adaptor plate.
Terminate wiring to the wiring strip.
Push the thermostat front onto the thermostat base.






 


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Thermostat Wiring

Zone Valve

 ----------------------------------------------------------

 ----------------------------------------------------------

Wiring Center 315 or 316

 ---------------------------------------------

 ---------------------------------------------

Relay 003

 -----------------------------------------------------------

 -----------------------------------------------------------

C

518

R

Rh W1 S1 Com

No Power

C

518

R

Rh W1 S1 Com

No Power

Zone 
Valve

24 V (ac)

Transformer

009

L N

R C

Optional
Slab Sensor 079

C

518

R

Rh W1 S1 Com

No Power

C

518

R

Rh W1 S1 Com

No Power

tN4

C

W

R

C

518

R

Rh W1 S1 Com

No Power

Optional
Slab Sensor 079

Wiring Center

315 or 316

Install field
jumper wire
R to Rh

C

518

R

Rh W1 S1 Com

No Power

R C

2
1
8
7

3
4
5
6

C

518

R

Rh W1 S1 Com

No Power

L

N G

115 V (ac)

Optional
Slab Sensor 079

Relay 003

Transformer

009

Install field
jumper wire
R to Rh

Install field
jumper wire
R to Rh

 


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Switching Relay

 -----------------------------------------------------

 -----------------------------------------------------

Testing the Thermostat Wiring

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:

1. Remove the thermostat front.

2. Use an electrical meter to measure voltage between the R and C wiring terminals. 

For AC power supplies the voltage should measure between 10 to 30 V (ac). For 
DC power supplies the voltage should measure between 10 to 30 V (dc).

3. If the voltage on the R and C wire terminations is continuous and the thermostat 

display is not on, the thermostat may have a fault. Contact your tekmar sales 
representative for assistance.

If the thermostat display intially powers on but later shuts off intermittantly, there 
may be a short circuit from the W wire to ground, or the power supply is too small to 
power the load.

Testing the Heat Zone Output Wiring

 

----------------------------------

 

----------------------------------

1. Touch the 

 button and set the heating temperature above the current room 

temperature. Make sure the display does not flash “Max” if using a floor sensor.

2. When the “Heat On” symbol appears on the display, use an electrical meter to check 

for voltage on the W and C wires connected to the zone valve, wiring center, relay 
or switching relay. The electrical meter should read 10 to 30 V (ac) or (dc).

3. If the W and C wire have voltage, check the zone valve, wiring center, relay or pump 

to determine if the heat device is operating correctly.

Thermostat Wiring

C

518

R

Rh W1 S1

Com

No Power

R

W

24 V

R

W

H

N

X

X

H

N

H

N

N

H

Com

Switching Relay

Zone 1 Zone 2 Zone 3

Class 2

Transformer

R

W

Zone 1 Zone 2

Zone 3

C

518

R

Rh W1 S1

Com

No Power

Optional
Slab Sensor 079

L

N

Pump

 


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HEAT ON

Heat is turned on.

MODE OFF

The heating system is off. 

WARNING SYMBOL

Indicates an error is present.

MIN

The floor is at or below the 
floor minimum temperature.

MAX

The floor has reached the 
floor maximum temperature.

Home Screen

Symbols Description

User Interface

 


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Heating Operation

Sequence of Operation

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.

Air Temperature Only

 ------------------------------------------------

 ------------------------------------------------

If there is only an air temperature sensor (no floor sensor), the thermostat operates to 
control your desired air temperature.

Floor Temperature Only

 ----------------------------------------------

 ----------------------------------------------

If the air sensor has been disabled, the thermostat will only maintain floor temperature 
and ignore air temperature. This operation is recommended for areas such as bathrooms 
to ensure that tile floors are warm to the touch.

Floor and Air Temperature 

 -------------------------------------------

 -------------------------------------------

If the air sensor is turned on and a floor sensor is connected, the thermostat will maintain 
the desired air temperature as well as a minimum floor temperature.

This operation is recommended for areas with large windows that allow the sun to 
shine into a room and keep it warm without the need for heat. This can allow the floors 
to cool off during the afternoon. When the sun goes down, it can take a long time for 
the floors to get warm again. This may cause the room to cool off too much in the early 
evening. A floor minimum setting can help with this condition by maintaining a floor 
minimum temperature. Keep in mind the floor minimum temperature will override the 
air temperature, and if set too high, may overheat the room.

This operation is also recommended for rooms with hardwood floors. Setting floor 
minimum and maximum temperatures is a way of enhancing the comfort of the living 
space while protecting floor coverings.

90°F (32°C)
Feels hot to the touch

80 to 85°F (26 to 30°C)
Feels warm to the touch

70°F (21°C)
Feels cool to the touch

40 to 45°F (5 to 7°C)
Feels cold to the touch

Suggested maximum for all floor 
types other than wood.

Bathrooms and kitchens. Suggested 
maximum for wood floors.

Rooms with large windows preventing 
under heating in the evening.

Freeze protection for garages.

 


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Programmable Settings

Setting

Display

User settings. Press the 

 

and

 

 

buttons together for 3 seconds to enter and 

advance to the next setting.

MODE

Select heat or off.

Range: HEAT, OFF

Default: HEAT

UNITS

Select the temperature units.

Range: °F or °C

Default: °F

LIGHT

Select when the display back light should operate. Auto 
operates the backlight for 30 seconds after a keystroke.

Range: OFF, AUTO, ON

Default: AUTO

SET FLOOR

Set the floor minimum temperature. Available when an 
auxiliary floor sensor is connected and the built-in room 
sensor is on.

F

Range: OFF, 40 to 122°F (4.5 to 50.0°C)

Default: 72°F (22.0°C)

TYPE

Device Type number. Hold the 

 button to view the 

software version.

ESCAPE

Release the 

 and 

 buttons to return to the home screen.

Installer settings. Press the 

 

and

 

 

buttons together for 5 more seconds.

AUXILIARY SENSOR 

Select the type of auxiliary sensor. Available when an auxiliary 
sensor is automatically detected.

Range: 

NONE

 = no auxiliary sensor, 

ROOM

 = Indoor 

Sensor, 

FLOR

 = Slab Sensor, 

OUT

 = Outdoor Sensor

Default: OFF

ROOM SENSOR

Select 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.

Room

Range: ON or OFF

Default: ON

SET FLOOR MAXIMUM

Set the floor maximum temperature in order to protect the 
floor covering. Suggested settings: Tile = 90°F (32°C), 
Wood Floor = 85°F (29°C)

F

MAX

Range: 40 to 122°F (4.5 to 50.0°C), OFF

Default: 85°F (29.5°C)

ESCAPE

Release the 

 and 

 buttons to return to the home screen.

 


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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

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

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.

Troubleshooting

Error Messages

 


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Technical Data

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

Frequently Asked Questions

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.

Thermostat does 

not heat.

Mode Off

Thermostat must be in Mode Heat in 

order to provide heating.

 


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All specifications are subject
to change without notice

12 of 12

518_D - 03/13.

Product design, software and literature are Copyright ©2013 by tekmar Control Systems Ltd., 

A Watts Water Technologies Company.

  Head Offi ce: 5100 Silver Star Road, Vernon, B.C. 

Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650 Web Site: www.tekmarControls.com

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 pass-
through 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 pass-
through 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 war-
ranty period. This Limited Warranty does not cover the cost of the parts or labor to remove or transport the defec-
tive 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 instruc-
tions.

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 WAR-
RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURABILITY OR DESCRIP-
TION 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 LIM-
ITED 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 materi-

als 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.

Limited Warranty and Product Return Procedure