Tekmar 518 User manual

Thermostat 518

Installation & Operation Manual

518

03/13

Zoning

Replaces: New

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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.

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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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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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.

•

3 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

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

518 RRh W1 S1 Com

No Power

518 RRh W1 S1 Com

No Power

Zone

Valve

24 V (ac)

Transformer

009

Optional

Slab Sensor 079

518 RRh W1 S1 Com

No Power

518 RRh W1 S1 Com

No Power

tN4 C W

518 RRh W1 S1 Com

No Power

Optional

Slab Sensor 079

Wiring Center

315 or 316

Install field

jumper wire

R to Rh

518 RRh W1 S1 Com

No Power

518 RRh W1 S1 Com

No Power

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

518 RRh W1 S1 Com

No Power

24 V

HNXX HNHN NH

Com Switching Relay

Zone 1 Zone 2 Zone 3

Class 2

Transformer

Zone 1 Zone 2 Zone 3

518 RRh W1 S1 Com

No Power

Optional

Slab Sensor 079

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

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.

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)

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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