Tekmar 542 User manual

W542

12/08

tekmarNet®4 Thermostat 542

- Wiring Brochure

Overview

Information

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Choose controls

to match

application

1Application

Brochure

Design your

mechanical

applications

2Layout

Brochure

Rough-in

wiring

instructions

3Wiring

Brochure

Wiring and

installation of

specific control

4Job

Record

Record settings &

wiring details for

future reference

Data

Brochure

Control settings

and sequence of

operation

The following brochure describes how to wire the tekmar tekmarNet®4 (tN4) thermostat 542. The 542 has outputs for one

heat stage. The 542 has inputs for two auxiliary sensors. The wiring of 542 thermostat is simple and cost effective.

Table of Contents:

Definitions.......................................................................2

Rough-In Wiring .............................................................2

Remove the Wiring Cover ..............................................3

Mounting the Thermostat ...............................................3

Wiring Symbols...............................................................3

Electrical Drawings ......................................................3-5

Wiring the Thermostat ....................................................6

Troubleshooting the Wiring .............................................7

Testing the Wiring...........................................................7

Technical Data................................................................8

Auxiliary

Sensors

1st Stage

Heating

DIP

Switches

tN4

Network

24 V (ac)

Power

Deﬁnitions

The following defined terms and symbols are used throughout this manual to bring attention to the presence of hazards of

various risk levels, or to important information concerning the life of the product.

– Caution: Refer to accompanying documents.

INSTALLATION

CATEGORY II – Local level appliances.

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

uses as a primary limit control. Other controls that are

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.

RH 80% to 88°F (31°C), down to 50% from 104 to

122°F (40 to 50°C). Non-condensing environment.

•

No exposure to extreme temperatures beyond 32 - 122°F

(0 - 50°C).

Rough-In Wiring

Sensor 2

Sensor 1

2 Cond. / 18 AWG

4 Cond. / 18 AWG

Note: When multiple wires

run to the same equipment

location, wiring conductors

can share one wire jacket.

1st Stage Heat

24 V (ac) Power

tN4 Network

Zone Manager

•

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 ft. (1.5 m) off the finished floor.

Use standard 18 AWG wire for the thermostat power, stages

tN4 and sensor connections.

Refer to the diagram below to determine the number of

conductors to run from each piece of equipment to the

thermostat location.

intended and certified as safety limits must be placed into

the control circuit. Do not attempt to service the control.

Refer to qualified personnel for servicing. There are no

user serviceable parts. Attempting to do so voids warranty

and could result in damage to the equipment and possibly

even personal injury or death.

Mounting the Thermostat

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.

Remove the Wiring Cover:

To remove the wiring cover:

•

Place a small slot screwdriver or similar tool into the slot

located on the top of the thermostat.

•

While pushing against the plastic tab, pull the top of the

front cover so that it pivots around the bottom edge of

the thermostat’s base.

The electrical drawing examples on the following

pages show the 542 in common applications. Choose

the drawing that most accurately depicts the components

in your system and use that drawing as a guide to aid in

wiring your system.

These are only concept drawings, not engineered drawings.

They are not intended to describe a complete system nor

any particular system. It is up to the system designer to

Electrical Drawings

Wiring Symbols

Dry contact switch. Operates a device.

Do not apply power to these terminals.

Serious control damage will result.

Powered switch. 24 V (ac), switched

output to valve, pump relay etc. tekmarNet®4

Factory jumper.

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.

determine the necessary components for and configuration

of the particular system being designed including additional

equipment isolation relays (for loads greater than the

controls specified output ratings) and any safety devices

which in the judgement of the designer are appropriate in

order to properly size, configure and design that system

and to ensure compliance with building and safety code

requirements.

Stud

Switch

Box

Thermostat

Base

007 Adaptor

Plate

Thermostat 31/4”

(83 mm)

Stud

23/8”

(60 mm)

screwhole

23/8”

(60 mm)

screwhole

Thermostat

Base

Wall

Mounted on wallboardMounted on switch box

Item

Remove cover

Push tab

Electrical Application 542 E1

Description:

One Stage Heating (H1= Radiant).

Legend:

Sensor 1 = Floor

Sensor 2 = Outdoor

Outdoor Sensor

070

tN4 C RW

Slab Sensor

079

Zone Managers

Factory installed jumper

connects R to Rh

(terminals 3 to 4) To

isolate W relay,

cut jumper

542 tNt

Electrical Application 542 E2

Description:

One Stage Heating (H1= Fin-tube Convector).

Legend:

Sensor 1 = Remote

Sensor 2 = Room

Factory installed jumper

connects R to Rh

(terminals 3 to 4) To

isolate W relay,

cut jumper External Class 2

Transformer

24 V (ac)

R C

Universal

Sensor 071

Other tN4 Thermostat

or Zone Manager

Indoor Sensor

076

542 tNt

Wire the tN4 communication to terminals tN4 and C.

If a Zone Manager is used:

•

Connect the tN4 on the thermostat to the tN4 on the

proper zone of the Zone Manager used for the first stage

of heat. The C terminal is already connected.

If a Zone Manager is not used:

•

Connect the tN4 on the thermostat to the tN4 on another

tN4 device on the same tN4 bus.

•

Connect the C on the thermostat to the C terminal on

another tN4 device on the same tN4 bus.

tN4 Communication Terminals 1, 2

Wire the first stage of heating to the Heat 1 Relay.

(Rh - W)

•

Use these terminals as a switch to operate the first stage

of heating.

If a Zone Manager is used:

•

Connect W on the thermostat to W on the proper zone

of the Zone Manager.

If a Zone Manager is not used:

•

Determine if the factory jumper must be cut.

•

When the factory jumper is not cut, W is a powered

output that is internally connected to R.

•

When the factory jumper is cut, Rh W is an isolated

switch. No power is available from these terminals.

Heat 1 Relay Terminals 3 - 5

Wire 24V (ac) to terminals C and R.

If a Zone Manager is used:

•

Connect C on the thermostat to C on the proper zone

of the Zone Manager.

•

Connect R on the thermostat to R on the proper zone

of the Zone Manager.

If a 24 V(ac) transformer is used:

•

Connect C on the thermostat to C on the transformer.

•

Connect R on the thermostat to R on the transformer.

Power (24 V (ac)) Terminals 2, 3

Note: This connection is polarity sensitive.

Wiring the Thermostat:

The auxiliary sensors are connected to the thermostat on

terminals Com, S1 and S2.

•

• Connect sensor 1 to terminals S1 and Com.

•

• Connect sensor 2 to terminals S2 and Com.

Do not apply power to terminals 6 - 8, permanent

damage to the sensors and/ or thermostat will result!

Auxiliary Sensors Terminals 6 - 8

Do Not Apply Power

Thermostat

Universal

Sensor

Outdoor

Sensor

To various tekmar

sensors

8S2

7S1

6Com

tN4 C RW

Thermostat

Zone Manager

tN4 C R Rh W

12345

Thermostat

Zone Manager

or other tN4

thermostat

tN4 C R Rh W

12345

tN4 C RW

*Factory installed jumper

connects terminals R to Rh

(to isolate W relay, cut jumper)

Thermostat

Zone Manager

tN4 C R Rh W

12345

tN4 C RW

Troubleshooting the Wiring

The following tests are to be performed using standard

testing practices and procedures and should only be carried

out by properly trained and experienced persons.

A good quality electrical test meter, capable of reading

from at least 0 - 300 V (ac), 0 - 2,000,000 Ohms, and testing

for continuity is essential to properly test the wiring and

sensors.

General

Testing the Wiring

Testing 24 V (ac) Power Supply

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 24V (ac)

+/– 10%.

3. Install the front cover.

1. Remove the front cover from the thermostat.

2. Disconnect the wires from the relay that is to be

tested.

3. Use an electrical test meter and check for continuity

across the relay.

•

• When the relay’s symbol is displayed in the LCD,

there should be continuity.

•

• When the relay’s symbol is not displayed in the

LCD, there should be no continuity.

4. Reconnect the wires to the relay.

5. Install the front cover on the thermostat.

542 LCD Display Segments

Heat 1

Testing the Relays

To test the sensors, the actual temperature at each sensor

location must be measured.

Use a good quality digital thermometer with a surface

temperature probe for ease of use and accuracy. Where

a digital thermometer is not available, place a spare

sensor alongside the one to be tested and compare

the readings.

Testing the Sensors

1. Remove the front cover from the thermostat.

2. Disconnect the wires from the sensor that is to be

tested.

3. Test the sensor’s resistance according to the instructions

in the sensor Data Brochure D070, D 074 or D079.

4. Reconnect the wires.

5. Install the front cover on the thermostat.

To test the tN4 Network, check the wires for continuity.

1. Remove the front cover from the thermostat.

2. Disconnect the two wires (tN4 and C) at one end and

connect them together.

Testing the tN4 Network

3. Go to the other end of the wires and disconnect them.

4. Using an electrical test meter, check for continuity.

5. Reconnect the wires.

6. Install the front cover on the thermostat.

tN4 C R Rh W

12345

8S2

7S1

6Com

###

tekmar Control Systems Ltd., Canada

tekmar Control Systems, Inc., U.S.A.

Head Office: 5100 Silver Star Road

Vernon, B.C. Canada V1B 3K4

(250) 545-7749 Fax. (250) 545-0650

Web Site: www.tekmarcontrols.com

tekmar Control Systems Ltd. and tekmar Control Systems, Inc. 8 of 8 All specifications are subject to change without notice.

Printed in Canada. W542 - 12/08.

Technical Data:

tekmarNet®4 Thermostat 542: One Stage Heat

Control Microprocessor PID control; This is not a safety (limit) control

Packaged weight 0.46 lb. (210 g)

Enclosure White PVC plastic

Dimensions 2-7/8” H x 2-7/8” W x 13/16” D (73 x 73 x 21 mm)

Approvals CSA C US, CSA/UL 61010-1, meets Class B: ICES and FCC Part 15

Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C)

RH 80% to 88°F (31°C), down to 50% from 104 to 122°F (40 to 50°C)

Altitude <6560 feet (2000 m), Installation Category II, Pollution Degree 2

Power supply 24 V(ac) ± 10% 60 Hz, 1.6 VA, NEC / CEC Class 2

W1 Relay 24 V(ac) 2 A

Sensors: NTC thermistor, 10 k @ 77°F (25°C ± 0.2°C) ß = 3892

– Included None

– Optional tekmar type # 071, 070, 072, 073, 076, 077, 078, 079, 082, 084

Technical Data

The installer must ensure that this control and its wiring are isolated and/ or shielded from strong sources of electromag-

netic noise. Conversely, this Class B digital apparatus complies with Part 15 of the FCC Rules and meets all requirements

of the Canadian Interference-Causing Equipment Regulations. However, if this control does cause harmful interference to

radio or television reception, which is determined by turning the control off and on, the user is encouraged to try to correct

the interference by re-orientating or relocating the receiving antenna, relocating the receiver with respect to this control,

and /or connecting the control to a different circuit from that to which the receiver is connected.

Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.

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