Tekmar 537 User manual

W537

01/09

tekmarNet®4 Thermostat 537

- 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 tekmarNet®4 (tN4) thermostat 537. The 537 has an output for one

stage of heat.

Table of Contents:

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

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

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

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

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

Electrical Drawings .....................................................3, 4

Wiring the Thermostat ....................................................5

Troubleshooting the Wiring.............................................6

Testing the Wiring...........................................................6

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

12 34

Thermal Motor None

Heating

DIP

Switch

Settings

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.

•

Relative Humidity 92% to 104°F (40°C), and 50%

above 104°F (40°C). Non-condensing environment.

•

No exposure to extreme temperatures beyond 36-122°F

(2-50°C).

Rough-In Wiring

4 Cond. / 18 AWG

1st Stage Heat

24 V (ac) Power

tN4 Network

Zone Manager

Note: When multiple wires

run to the same equipment

location, wiring conductors

can share one wire jacket.

•

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 537 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

determine the necessary components for and configuration

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

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.

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

Remove cover

Push tab

Electrical Application 537 E1

Description:

537 operates a hydronic heating system zone.

12 34

None

Thermal Motor

Zone Manager

537 tNt

tN4 C W

Test

Item

Heating System

Reset

Module

Zone

Manager

537

Terminals tN4 and C provide tN4 communication.

If a Zone Manager is used:

•

Connect tN4 on the thermostat to 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 tN4 on the thermostat to tN4 on another tN4

device on the same tN4 bus.

•

Connect C on the thermostat to the C terminal on another

tN4 device on the same tN4 bus.

tN4 Communication Terminals 1, 2

The W terminal is used to turn on the heating equipment.

The heating equipment must use the same power source

as the R and C terminals.

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:

•

Connect W on the thermostat to the heating equipment

(such as a furnace).

Heat Contact Terminal 4

Terminals R and C provide 24 V (ac) power.

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:

Zone Manager

tN4 C RW

Zone Manager

CRW

234

tN4 C RW

Thermostat

Zone Manager

tN4 C RW

tN4 C

Thermostat

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 24 V (ac) +/– 10%.

1. Remove the front cover from the thermostat.

2. Lower the Set Room temperature. The “H1” symbol

should not be on the display.

3. Set electrical test meter to continuity.

4. Place probes between R (3) and W (4). There should

be no continuity.

5. Increase the Set Room temperature. The “H1” symbol

should appear.

6. There should be continuity between the R (3) and W

(4) terminals.

Testing the Relays

3. Install the front cover.

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.

Testing the tN4 Buses

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.

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

1234

tN4 C R W

###

537 LCD Display Segments

Heat

Notes

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. W537 - 01/09.

Technical Data:

tekmarNet®4 Thermostat 537: One Stage Heat

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

Packaged weight 0.8 lb. (380 g), Enclosure J, 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, 36 to 122°F (2 to 50°C).

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

Altitude < 9840 feet (3000 m), Installation Category II, Pollution Degree 2

Power supply 24 V (ac) ± 10% 50/60 Hz, 1.8 VA Standby, 56 VA fully loaded, NEC / CEC Class 2

W Relay 24 V (ac) 2 A

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.

Table of contents

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