tekmar 521 Installation

521_D

Programmable Thermostat 521

Installation & Operation Manual

Introduction

The Programmable Thermostat 521 is designed for three different modes of operation: single stage heating, two stages of heating with a fan, or one stage of heating and one stage of cooling with a fan. Two auxiliary sensors may be added to measure the floor, outdoor or room temperature. A Slab Sensor 079 is included to measure floor temperature to protect the floor from overheating and enhance comfort. The programmable schedule supports either a 7 day or 24 hour schedule with 2 or 4 events per day. A permanent temperature hold button overrides the programmable schedule. An optional Adaptor Plate 012 is available to allow the thermostat to mount onto a single gang electrical box.

01/14

Zoning

Replaces: New

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

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521_D - 01/14

Table of Contents

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

Important Safety Information ...............3

Installation ...........................................4

Preparation .....................................4

Removing The Thermostat Base ....4

Mounting The Thermostat...............5

Slab Sensor 079 Installation ...........6

Slab Sensor 079 Wiring .................7

Slab Sensor 079 Testing .................8

Temperature vs. Resistance Table ...8

Thermostat Wiring .....................9-11

Testing the Thermostat Wiring ......12

Switch Settings ..................................13

User Interface ....................................14

Home Screen ................................14

Symbols Description .....................14

Programmable Settings .....................15

Fan Menu ......................................15

Set Temp Menu .............................16

Time Menu ....................................17

Schedule Menu ........................18-19

Setup Menu............................. 20-21

Sequence of Operation ......................22

Mode Button Operation ................22

Heating Operation .........................22

Cooling Operation .........................23

Fan Operation ...............................23

Time Clock ....................................24

Programmable Schedule ..............24

Optimum Start ...............................25

Temperature Adjustment ..............25

Access Levels ...............................25

Troubleshooting .................................26

Error Messages ............................26

Frequently Asked Questions ........27

Technical Data ..............................27

Limited Warranty and Product

Return Procedure .........................28

Getting Started

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.

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Important Safety Information

It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. tekmar is not responsible for damages resulting from improper installation and/or maintenance.

To avoid serious personal injury and damage to the equipment:

Read Manual and all product labels BEFORE using the equipment.

• Do not use unless you know the safe and proper operation of this equipment.

•

Keep this Manual available for easy access by all users.

•

Replacement Manuals are available at tekmarControls.com

Disconnect all power before opening the control.•

•

It is the installers responsibility to ensure that this control is safely installed according to all applicable codes and standards.

•

Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury or death.

•

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.

•

Do not attempt to service the control. There are no user serviceable parts inside the control. Attempting to do so voids warranty.

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Installation

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Preparation

Tools Required

•

tekmar or jeweller screwdriver Phillips head screwdriver

•

Materials Required

18 AWG LVT Solid Wire

• (Low Voltage Connections)

Installation Location

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 5 conductor, 18 AWG wire.

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Wire Stripper•

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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

Stud

3 1/4"

(83 mm)

Gang Box

Thermostat

Front

Adapter Plate 012

Thermostat

Base

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.

•

Thermostat

Front

Base

Wall

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.

•

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Slab Sensor 079 Installation

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New Installations

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Thin-Set or Thin-Pour Applications

If the floor covering is to be installed over either a thin-set or thin-pour material of sufficient depth, the 079 slab sensor can be placed directly into either the thin-set material or the thin-pour material and covered over. Ensure that the sensor is located in such a position that the attached wire is able to reach to a suitable junction location. Splices within the thin-set or thin-pour should be avoided to ensure trouble

Thin-set

Electric Cables

Tiles

free operation. The sensor should be located mid way between the heating elements to ensure a proper temperature reading.

Thin Floor Coverings (less than 3/8" (10 mm))

If a thin floor covering is to be installed directly to the subfloor, a groove 1/8" (4 mm) wide by 1/16" (2 mm) deep can be cut into the surface of the subfloor to accommodate the wire for the sensor. Ensure that the sensor is located in such a position that the attached wire is able to reach to a suitable junction location. Splices under the floor covering should be avoided to ensure trouble free operation. A groove 3/16" (5 mm) wide by 3/16" (5 mm)

Hardwood

Subfloor

deep by 1-3/4" (45 mm) long should be cut to accommodate the sensor. The sensor should be located mid way between the heating elements to ensure a proper temperature reading.

Thick Floor Coverings (greater than 3/8" (10 mm))

If a thick floor covering is to be installed directly to the subfloor, a groove 1/8" (4 mm) wide by 1/16" (2 mm) deep can be cut into the back of the flooring material to accommodate the wire for the sensor. Ensure that the sensor is located in such a position that the attached wire is able to reach to a suitable junction location.

Splices under the floor covering should be avoided to ensure trouble free operation. A groove 3/16"

Hardwood

(5 mm) wide by 3/16" (5 mm) deep by 1-3/4" (45 mm) long should be cut to accommodate the sensor. The sensor should be located mid way

Subfloor

between the heating elements to ensure a proper temperature reading.

If it is not practical to cut a groove in the surface covering, follow the installation method used for thin floor coverings.

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Retrofit Installations

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Tile Floor Coverings

If a Slab Sensor 079 is to be installed into an existing tile floor with sufficiently large grout lines, the sensor and wire can be installed in one of the grout lines between the tiles. Select a low traffic area of the floor that is mid way between the heating elements for the sensor location. Ensure that the sensor is located in such a position that the attached wire is able to reach to a suitable junction location. Splices within the grout should be avoided to ensure trouble free operation. Remove the appropriate grout line and place the sensor and wire in the floor. Re-grout the area.

Installing the Sensor to the Bottom of a Subfloor

If the sensor is to be installed to the bottom of a subfloor, cut a piece of 1" (25 mm) thick rigid insulation into a 6" (150 mm) by 6" (150 mm) square. A groove 3/16" (5 mm) wide by 3/16" (5 mm) deep by 1-3/4" (45 mm) long should be cut into the insulation to accommodate the sensor. Place the sensor in the groove and sandwich the sensor between the insulation and the subfloor. Use a suitable fastening method to affix the insulation to the subfloor.

Do not run sensor wires parallel to telephone or power cables. If the sensor wires are located in an area with strong sources of electromagnetic interference, shielded cable or twisted pair should be used or the wires can be run in a grounded metal conduit.

Slab Sensor 079 Wiring

The Slab Sensor 079 is supplied with 10' (3 m) of cable. If a longer length is required, 24 AWG or larger wire can be spliced onto the two wires from the sensor. The splices should be properly soldered and protected in an accessible junction box. Follow the sensor testing instructions given in this brochure and then connect the wires to the control.

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Slab Sensor 079 Testing

A good quality test meter capable of measuring up to 5,000 k (1 k = 1000) is required to measure the sensor resistance. In addition to this, the actual temperature must be measured with either a good quality digital thermometer, or if a thermometer is not available, a second sensor can be placed alongside the one to be tested and the readings compared.

First measure the room temperature using the thermometer. Disconnect the S1 or S2 and Com wires from the thermostat. Using an electrical meter, measure the resistance of the S1 or S2 and Com wires at the thermostat location. Using the temperature versus resistance table, estimate the temperature measured by the sensor. The sensor measurement and thermometer readings should be close. If the test meter reads a very high resistance, there may be a broken wire, a poor wiring connection or a defective sensor. If the resistance is very low, the wiring may be shorted, there may be moisture in the sensor or the sensor may be defective. To test for a defective sensor, measure the resistance directly at the sensor location. Once the test has been completed, reconnect the S1 or S2 and Com wires to the thermostat.

Do not apply voltage to the temperature sensor terminals at any time as damage to the sensor may result.

Temperature vs. Resistance Table

Temperature Resistance

°F °C

-50 -46 490,813

-45 -43 405,710

-40 -40 336,606

-35 -37 280,279

-30 -34 234,196

-25 -32 196,358

-20 -29 165,180

-15 -26 139,402

-10 -23 118,018

-5 -21 100,221 0 -18 85,362 5-15 72,918

10 -12 62,465 15 -9 53,658 20 -7 46,218

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Temperature Resistance

°F °C

25 -4 39,913 30 -1 34,558 35 2 29,996 40 4 26,099 45 7 22,763 50 10 19,900 55 13 17,436 60 16 15,311 65 18 13,474 70 21 11,883 75 24 10,501 80 27 9,299 85 29 8,250 90 32 7,334 95 35 6,532

Temperature vs. Resistance Table - Continued

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Temperature Resistance

°F °C

100 38 5,828 105 41 5,210 110 43 4,665 115 4 6 4 ,18 4 120 49 3,760 125 52 3,383 130 54 3,050 135 57 2,754 140 60 2,490 145 63 2,255 150 66 2,045 155 68 1,857 160 71 1,689

Temperature Resistance

°F °C

165 74 1,538 170 77 1,403 175 79 1,281 180 82 1,172 185 85 1,073 190 88 983 195 91 903 200 93 829 205 96 763 210 99 703 215 102 648 220 104 598 225 107 553

Thermostat Wiring

Zone Valve

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Zone Valve

Boiler

Transf orme r

Field Jumper Required: R to Rh

C R

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Y/W2

Rc GGRh W1 S1 S2Com

No Power

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