Tekmar D540 User manual

tekmarNet®4 Thermostat 540

Installation & Operation Manual

D540

08/10

Replaces:03/09

Zoning

The tekmarNet®4 Thermostat 540

provides operation for:

One Stage Heat

One Stage Cool

One Stage Fan

•

Introduction Features

Requires 7 wires (tN4, C, R, W,

Rc, Y, G)

Outdoor temperature display

Bright backlight

2 button temperature adjustment

Communication with other

tekmarNet®devices improves

system efficiency and comfort

Schedule member status enables

setback operation

Optimum start

Responds to tekmarNet®Scenes

Cooling Group Master

Freeze protection

Exercising

Zone synchronization

•

Beneﬁts

Energy savings

Reduced temperature swings

Compatible with tekmarNet®

Timers, User Switches and

Gateway for additional control

Interlock prevents simultaneous

heating & cooling

•

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

tekmar or jeweller screwdriver

Phillips head screwdriver

•

Wire Stripper•

Tools Required

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

Materials Required

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

2, #6 x 1” Wood Screws

18 AWG LVT Solid Wire

(Low Voltage Connections)

•

Optional Adapter Plate 007 (for

installation on 2” x 4” gang box)

•

Installation

Table of Contents

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

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

Preparation....................................2

Removing The Thermostat Base...3

Mounting The Thermostat Base....3

Thermostat Wiring.........................4

Testing the Thermostat Wiring ......5

Mounting the Thermostat ..............6

Cleaning the Thermostat...............6

Switch Settings..................................7

User Interface....................................8

Display...........................................8

Symbols Description .....................8

Button Operation...........................9

Settings ..................................10-15

Sequence of Operation....................16

Heating Operation.......................16

Cooling Operation .......................17

Fan Operation .............................18

Schedules ...................................19

Scenes (System Override) ..........19

Troubleshooting ...............................20

Error Messages .................... 20-21

Frequently Asked Questions .......22

Job Record..................................23

Technical Data.............................23

Limited Warranty and Product

Return Procedure........................24

Caution

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.

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 max 92% up to 104°F (40°C), 50% RH above 104°F (40°C).

Non-condensing environment.

No exposure to extreme temperatures beyond 36-122°F (2-50°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 8 conductor, 18 AWG wire.

•

Installation Location

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

Removing The Thermostat Base

Push

tab

1Remove thermostat

from base

To remove the thermostat base:

Place a small slot screwdriver or similar

tool into the slot located on the top of

the thermostat.

While pushing down against the plastic

tab, pull the thermostat away from the

thermostat’s base.

•

Mounting The Thermostat Base

Stud

Switch

Box

Thermostat

Base

007 Adaptor

Plate

31/4”

(83 mm)

If a single gang switch box is used,

an Adaptor Plate 007 is required to

mount the thermostat to the box.

Fasten the base of the

thermostat to the adaptor plate.

Feed the wiring through the

openings in the back of the

adaptor plate and thermostat.

Use the upper and lower screw

holes to fasten the adaptor plate

to the box.

•

Mounted on switch box

If a switch box was not used, mount the

thermostat directly to the wall.

Feed the wiring through the openings in

the back of the thermostat.

Use screws in the screw holes to fasten the

thermostat to the wall. At least one of the

screws should enter a wall stud or similar

rigid material.

•

Stud

23/8”

(60 mm)

screwhole

23/8”

(60 mm)

screwhole

Thermostat

Base

Wall

Mounted on wallboard

Thermostat Wiring

The thermostat operates a single heating system zone together with a cooling

system and fan.

Connect tN4, C, R, and W terminals on the thermostat to the tN4, C, R and W terminals

on the tN4 Wiring Center or Zone Manager.

Connect the Rc, Y and G terminals on the thermostat to the R, Y and G terminals

on the cooling equipment.

12 34

tN4 Wiring Center

tN4 Zone Mana

Cooling Equipment

1 Stage

Cooling

1 Stage

Fan

G Y R

Fan

Cooling

tN4 C W

1234

tNt 540

540

One Stage Heat /

One Stage Cool / One Fan

Made in

Canada

Mmm YYYY

Lot # 12345

Meets Class B:

Canadian ICES

FCC Part 15

Power: 24 V ±10% 50/60 Hz 1.8 VA

56 VA fully loaded

Relays: 24 V (ac) 2 A

1001-01

tN4

Switch Settings:

For instructions see brochure

Use at least 75°C conductors

Setback

Scene

None

Lock

Unlock

Cool Master 1

Oﬀ

Testing the Thermostat Wiring

Testing the Power

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

1. Remove the front cover from the thermostat.

2. Use an electrical test meter to measure (ac) voltage between the R and C

terminals. The reading should be 24 V (ac) +/– 10%.

3. Install the front cover.

Testing the Heat, Cool, and Fan Relays

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

1. Remove the front cover from the thermostat.

2. Press Mode button until Mode is set to OFF.

3. Set the electrical test meter to continuity.

4. Place probes between R (3) and W (4), then between Rc (5) and Y (6). In both

cases there should be no continuity. If there is continuity then there may be a

wiring fault or the relay may be faulty.

5. Press Mode button until Mode is set to HEAT.

6. Press the button and set the heating temperature above the current room

temperature. Make sure the display does not show “WWSD”. The “H1” symbol

should appear on the display.

7. There should be continuity between the R (3) and W (4) terminals.

8. Press Mode button until Mode is set to COOL.

9. Press the button and set the cooling temperature below the current room

temperature. The “C1” symbol should appear on the display.

10. There should be continuity between the Rc (5) and Y (6) terminals.

11. Press Fan button to set the fan to Auto.

12. Ensure the fan symbol is not shown on the display.

13. There should be no continuity between Rc (5) and G (7) terminals.

14. Press Fan button to set the fan to On.

15. The “Fan” symbol should appear on the display.

16. There should be continuity between the Rc (5) and G (7) terminals.

Mounting the Thermostat

To place the thermostat back on the

mounting base:

Place thermostat bottom tabs on

matching mounting base notches.

Pivot top of the thermostat

towards wall, ensuring wires clear

obstructions.

The top clasp makes a clicking

sound when properly closed.

•

Pivot

Tab

The thermostats’s exterior can be cleaned using a damp cloth. Moisten the cloth

with water and wring out prior to wiping the control. Do not use solvents or cleaning

solutions.

Cleaning the Thermostat

Testing the tekmarNet®4 Bus

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

The symbol is shown on the display when communication is present. If the

thermostat is connected in a network and the communication is missing, there may

be an open or short circuit on the tN4 and C bus wires.

1. Remove the front cover from the thermostat.

2. To test for short circuits:

Disconnect the tN4 bus wires on one end.

Install wire nuts on each wire to ensure the wire ends are not touching.

Disconnect the tN4 bus wires on the other end.

Measure for continuity using an electrical meter.

If continuity is present, there is a short circuit fault along the wires. It is

recommended to replace the tN4 bus wires.

3. To test for open circuits:

Disconnect the tN4 bus wires on one end and connect them together.

Disconnect the tN4 bus wires on the other end.

Use an electrical meter to measure for continuity.

If there is no continuity, there is an open circuit fault along the wires. It is

recommended to replace the tN4 bus wires.

•

Switch Settings

Switches are set to “On”

position from the factory, and

do not require changing for

most applications.

12 34

1234

tNt 540

540

One Stage Heat /

One Stage Cool / One Fan

Made in

Canada

Mmm YYYY

Lot # 12345

Meets Class B:

Canadian ICES

FCC Part 15

Power: 24 V ±10% 50/60 Hz 1.8 VA

56 VA fully loaded

Relays: 24 V (ac) 2 A

1001-01

tN4

Switch Settings:

For instructions see brochure

Use at least 75°C conductors

Setback

Scene

None

Lock

Unlock

Cool Master 1

Oﬀ

12 34

1234

Meets Class B:

Switch Settings:

Setback

Scene

None

Unlock

Lock

Cool Master 1

Oﬀ

Switch

Position

Action

SETBACK

The thermostat follows a programmable setback schedule

as a schedule member if available. Requires the installation

of a Timer 033 to use this feature.

OFF OFF

The thermostat does not follow a programmable setback

schedule.

SCENE

The thermostat responds to changes in the scene (system

wide manual overrides). Requires the installation of a User

Switch 479 to use this feature.

OFF OFF

The thermostat does not respond to scenes.

ON NONE

The thermostat is not part of a cooling group.

OFF COOL MASTER 1

The thermostat is a master of cooling group number 1.

ON LOCK ACCESS LEVEL

Locked to ‘User’ access level. Set to Lock when installation

completed.

OFF

UNLOCK ACCESS LEVEL

Unlock to allow ‘User’ and “Installer’ access level. Set to

Unlock during installation process.

tekmarNet®reset control must also be set to Unlocked

(Installer access level).

SECONDARY DISPLAYMAIN DISPLAY

HEAT

Heat is turned on.

COOL

Cooling is turned on.

FAN

Fan is turned on.

SUN

Operating at the occupied

(day) temperature.

MOON

Operating at the unoccupied

(night) temperature.

COOL GROUP MASTER

Thermostat operates the

cooling for a group of

thermostats.

CLOCK

Operating on a

programmable schedule.

LOCK

Locked to ‘User’ access level.

AWAY

Operating at the Away scene

temperature.

tekmarNet®

Communication is present.

WARNING SYMBOL

Indicates an error is present.

WARM WEATHER SHUT

DOWN

The heating system has been

shut off for the summer.

Display

Symbols Description

Switch between

Heat, Cool, Auto

and Off modes

Switch between

Auto, On and %

Fan operation

Adjust the current temperature

or displayed setting up or down

User Interface

Button Operation

The Mode button selects between Auto, Cool, Heat, and Off.

Heat Mode: The heating system operates to maintain the Set

Room Heat temperature.

Cool Mode: The cooling system operates to maintain the Set Room

Cool temperature.

Auto Mode: The heating system operates to maintain the Set Room Heat temperature.

Likewise the cooling system operates to maintain the Set Room Cool temperature.

The thermostat will prevent the Set Room Heat and the Set Room Cool settings

from getting closer than 3°F (1.5°C).

To switch from heating to cooling, the heat must be off for at least a 30 minute

interlock period and the actual Room temperature must be at least 3°F (1.5°C)

above the Set Room Heat temperature.

To switch from cooling to heating, the cooling must be off for at least a 30 minute

interlock period and the Room temperature must be at least 3°F (1.5°C) below

the Set Room Cool temperature. Cooling has priority over heating.

Off Mode: The heating and cooling are shut off except heating for freeze

protection.

Mode

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

Fan

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

The fan button manually turns the fan on or off.

Auto: Fan is usually off but can operate with heating or cooling.

On: Fan is on all the time.

10 to 90%: Fan operates a minimum of this percentage each hour.

Press the or the button to select the room temperature. The display indicates

whether the “HEAT” or the “COOL” temperature is being changed.

Use the or

button to adjust

temperature.

If in Auto mode, press the Mode

button to toggle between Heat or

Cool temperature adjustment.

Room or Temperature

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

Settings (1 of 6)

Display Range Access Description Set to

40 to 95°F

(4.5 to 35.0°C)

Default = 70°F

(21.0°C)

Installer

User

SET ROOM HEAT

Set the room heating temperature while in the

event.

40 to 95°F

(4.5 to 35.0°C)

Default = 65°F

(18.5°C)

Installer

User

SET ROOM HEAT

Set the room heating temperature while in the

event.

40 to 95°F

(4.5 to 35.0°C)

Default = 62°F

(16.5°C)

Installer SET ROOM HEAT AWAY

Set the room heating temperature while in the Away

scene.

Continued on next page.

• Press and hold down both the and buttons for 2 seconds to change from one step to the next.

• Release both buttons once the step has been reached.

• Press the or the button to change the setting, if available.

• Press and hold down both the and buttons for 2 seconds to go to the next step, OR

• After 10 seconds of no button activity, the display goes back to normal operation.

• Note: Set switch setting #4 and tekmarNet®system control to Unlock to change Access level to Installer.

Press

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