tekmar 538 Installation

D538

tekmarNet®4 Thermostat 538

Installation & Operation Manual

Introduction

The tekmarNet®4 Thermostat 538
provides operation for:

One Stage Heat•

12/11

Zoning

Replaces:08/10

Features

Zone Synchronization

•
Zone Post Purge

•
Intelligent setback (Timer 033)

•
Scenes (Away override)

•
Auto Heating Cycle

•
tekmarNet® 4 communication

•
compatible

Requires 4 wires

•
Pulse Width Modulation

•
CSA C US Approved for use in

•
USA and Canada

Outdoor temperature display

•
Air Group member

•
Backlight

•
Freeze Protection

•
Equipment Exercising

•
Floor warming (Slab Sensor 079)

•
1 Auxiliary sensor input

•
Room Temperature Limiting

•
Supports Radiant Floor Cooling

•

1 of 24 © 2011

D 538 - 12/11

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

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

Table of Contents

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

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

Caution ..........................................2

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

Removing The Thermostat Base ...3

Mounting The Thermostat Base ....3

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

Testing the Thermostat Wiring ......4

Mounting the Thermostat ..............5

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

Switch Settings ..................................6

User Interface ....................................7

Display...........................................7

Button Operation ...........................7

Symbols Description .....................7

Settings ....................................8-14

Sequence of Operation .................... 15

Heating Operation ....................... 15

Air Group Operation .................... 16

Floor Cooling ...............................16

Schedules ................................... 17

Scenes (System Override) .......... 17

Troubleshooting ...............................18

Error Messages ......................18-21

Frequently Asked Questions .......22

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

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

Limited Warranty and Product

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

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.

Installation

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.

Preparation

Tools Re q uired

tekmar or jeweller screwdriver

•
Phillips head screwdriver

•

Materials Required

2, #6 x 1” Wood Screws

•
18 AWG LVT Solid Wire

•
(Low Voltage Connections)

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

Wire Stripper•

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

Optional Adapter Plate 007 (for

•
installation on 2” x 4” gang box)

2 of 24© 2011 D 538 - 12/11

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

•
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.

•

Removing The Thermostat 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.

1

Push
tab

Remove thermostat

2

from base

Mounting The Thermostat Base

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.

Stud

Switch
Box

1

/4”

Thermostat

Base

007 Adaptor

Plate

3

(83 mm)

Mounted on switch box

3 of 24 © 2011 D 538 - 12/11

If a switch box was not used, mount the

2

3

/8”

(60 mm)

screwhole

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

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

Base

Stud

thermostat to the wall. At least one of the
screws should enter a wall stud or similar
rigid material.

3

2

/8”

(60 mm)

screwhole

Wall

Mounted on wallboard

Thermostat Wiring

The thermostat operates a single heating system zone.

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 optional auxiliary sensor wires to the sensor terminals 5 and 6.

538

Slab Sensor 072, 073, 079

Indoor Sensor 076, 077, 084

OR

Outdoor Sensor 070

OR

65

Sensor

No Power

Use at least 75°C conductors
For instructions see brochure

tN41C2R3W

4

tNt 538

One Stage Heat

Power: 24 V ±10% 50/60 Hz 1.8 VA
56 VA fully loaded
Relay: 24 V (ac) 2 A

ON

Switch Settings:

1001-0 3

Lock

Scene

Setback

Unlock

Off

Off

1234

12 34

Not used

Not used

Mmm YYYY

Lot # 12345

Meets Class B:

Canadian ICES

FCC Part 15

tN4 Wiring Center

or

tN4 C W

R

tN4 Zone Manager

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.

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

4 of 24© 2011 D 538 - 12/11

Testing the Heat Relay

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

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

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

1. Remove the front cover from the thermostat.

2. Press the button and set the heating temperature below the current room
temperature. There should be no H1 symbol on the display.

3. Set the electrical test meter to continuity.

4. Place probes between R (3) and W (4). There should be no continuity. If there
is continuity then there may be a wiring fault or the relay may be faulty.

5. 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.

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

Testing the tekm a r N et®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.

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

5 of 24 © 2011 D 538 - 12/11

12 34

1234

Mmm YYY

L t # 1234

Meets Class B:

Canadian ICES

Switch Settings:

Setback

Scene

Lock

Not used

ON

Not used

Unlock

Off

Off

Cleaning the Thermostat

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.

Switch Settings

538

ON

Setback

Off

Switch Settings:

1234

12 34

Scene

Off

1001-03

Mmm YYYY

Lot # 12345

Lock

Not used

Meets Class B:

Canadian ICES

FCC Part 15

Not used

Unlock

Switches are set to “On”
position from the factory, and
do not require changing for
most applications.

65

Sensor

No Power

Use at least 75°C conductors
For instructions see brochure

tN41C2R3W

4

tNt 538

One Stage Heat

Power: 24 V ±10% 50/60 Hz 1.8 VA
56 VA fully loaded
Relay: 24 V (ac) 2 A

Switch

1

2

3

4

Position

ON

OFF

ON

OFF

ON

OFF

ON

OFF

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

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

The thermostat does not respond to scenes.

LOCK ACCESS LEVEL

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

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).

Not used

Not used

6 of 24© 2011 D 538 - 12/11

User Interface

Display

SECONDARY DISPLAYMAIN DISPLAY

Button Operation

Press the or the button to select the room temperature.

Symbols Description

HEAT

Heat is turned on.

SUN

Operating at the occupied
(day) temperature.

MOON

Operating at the unoccupied
(night) temperature.

AWAY

Operating at the Away scene
temperature.

AIR GROUP

The air group is cooling.
Heating can start once the
cooling is finished.

LOCK

Locked to ‘User’ access level.

CLOCK

Operating on a
programmable schedule.

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.

7 of 24 © 2011 D 538 - 12/11

®

®

and buttons for 2 seconds to go to the next step, OR

system control to Unlock to change Access level to Installer.

SET ROOM HEAT

Set the room heating temperature while in the

event.

Installer

User

SET ROOM HEAT

Set the room heating temperature while in the

Installer

User

event.

SET ROOM HEAT AWAY

Set the room heating temperature while in the Away

Installer

scene.

(21.0°C)

Default = 70°F

(4.5 to 35.0°C)

40 to 95°F

Press

• 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.

+

Together

• Press and hold down both the

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

• Note: Set switch setting #3 and tekmarNet

40 to 95°F

Display Range Access Description Set to

Settings (1 of 7)

8 of 24© 2011 D 538 - 12/11

(18.5°C)

Default = 65°F

(4.5 to 35.0°C)

40 to 95°F

(4.5 to 35.0°C)

(16.5°C)

Default = 62°F

Continued on next page.

SET FLOOR HEAT

Set the floor heating temperature while in the

event.

Available when:

Installer

A slab sensor is installed on the auxiliary sensor

input AND Sensor setting in the Adjust menu is set

•

User

to Floor AND Room Sensor setting in the Adjust

menu is set to Off.

SET FLOOR HEAT

Set the floor heating temperature while in the

A slab sensor is installed on the auxiliary sensor

event.

input AND Sensor setting in the Adjust menu is set

Available when:

•

Installer

User

to Floor AND Room Sensor setting in the Adjust

menu is set to Off.

BACKLIGHT

Select the backlight operation.

Off = Permanently Off

Installer

30 = Temporary on for 30 seconds

User

On = Permanently On

On + = On during and off during

40 to 122°F

(4.5 to 50.0°C)

(22.0°C)

Default = 72°F

40 to 122°F

(18.5°C)

Default = 65°F

(4.5 to 50.0°C)

On +

Off, 30 sec, On,

Default = 30 sec

Display Range Access Description Set to

Settings (2 of 7)

9 of 24 © 2011 D 538 - 12/11

Continued on next page.

TEMPERATURE UNITS

Press the or the button to change from °F to

°C and vice versa.

Installer

User

DEVICE TYPE

Display alternates between the Device Type (large

Installer

number) with Software Version (upper right corner)

and the thermostat address.

User

MAXIMUM SET ROOM HEAT

Set the maximum room heating limit while in the

Installer

event.

MAXIMUM SET ROOM HEAT

Set the maximum room heating limit while in the

Installer

event.

MINIMUM SET ROOM HEAT

Set the minimum room heating limit.

Installer

°F or °C

Default = °F

Device Type with

Address

Software Version,

40 to 95°F

(4.5 to 35.0°C)

(29.5°C)

40 to 95°F

Default = 85°F

(29.5°C)

Default = 85°F

(4.5 to 35.0°C)

40 to 95°F

(7.0°C)

Default = 45°F

(4.5 to 35.0°C)

Display Range Access Description Set to

Settings (3 of 7)

10 of 24© 2011 D 538 - 12/11

Continued on next page.

SET FLOOR MINIMUM

Set the floor minimum temperature while in the event.

The floor minimum heats the floor even when the room

temperature is satisfied.

The measured floor temperature is shown in the upper

right hand corner of the display.

Room Sensor setting in the Adjust menu is set to

On AND

A slab sensor is installed on the auxiliary sensor

Available when:

•

input AND

•

Sensor setting in the Adjust menu is set to Floor.

•

SET FLOOR MINIMUM

Set the floor minimum temperature while in the event.

The floor minimum heats the floor even when the room

temperature is satisfied.

The measured floor temperature is shown in the upper

right hand corner of the display.

Available when:

Room Sensor setting in the Adjust menu is set to

On AND

•

A slab sensor is installed on the auxiliary sensor

input AND

Sensor setting in the Adjust menu is set to Floor.

•

•

(Off, 4.5 to

Off, 40 to 122°F

User

Installer

50.0°C)

Default = 72°F

(22.0°C)

Installer

(Off, 4.5 to

Off, 40 to 122°F

User

50.0°C)
Default = Off

Display Range Access Description Set to

Settings (4 of 7)

11 of 24 © 2011 D 538 - 12/11

Continued on next page.

Room Sensor setting in the Adjust menu is set to

H1

ADJUST

FLOOR MAXIMUM

Set the floor maximum temperature in order to protect

the floor covering.

On AND

Available when:

•

A slab sensor is installed on the auxiliary sensor

input AND

Sensor setting in the Adjust menu is set to Floor.

•

•

SCHEDULE

Switch setting 1 is set to Setback (On Position).•

Thermostat can follow schedule master 1, 2, 3, or 4.

Available when:

HEAT SUPPLY PUMP

During heating, select whether or not the system supply

pump should turn on or be off to allow a zone group

system.•

®

A reset control is present on the tekmarNet

pump per manifold.

Available when:

Installer

Installer

Installer

Off)

(29.5°C)

Default = 85°F

(4.5 to 50.0°C,

40 to 122°F, Off

1, 2, 3, 4

Default = 1

OFF or On

Default = On

H1

Display Range Access Description Set to

ADJUST

Settings (5 of 7)

12 of 24© 2011 D 538 - 12/11

SUPPLY

Continued on next page.

H1

ADJUST

system.•

ADJUST

®

system.•

®

system.

®

.

®

HEAT SUPPLY PUMP DELAY

A reset control is present on the tekmarNet

During heating, select whether or not the system supply

pump should be delayed by 3 minutes before coming

on (for thermal motor or wax actuator).

Available when:

HEAT CYCLES PER HOUR

Select either Auto cycle or Synchronize with other

thermostats on the tekmarNet

Choose Synchronize when zone heated using a boiler.

Installer

Installer

No reset control on the tekmarNet

Choose Auto when zone is non-hydronic heating.

Available when:

AIR GROUP

Select if this thermostat should be an air group member.

Select off if the thermsotat is not an air group member.

Select 1 though 16 to select the air group number.

The thermostat is connected to other thermostats

using tekmarNet

Available when:

•

ROOM SENSOR

Select whether the built-in air temperature sensor is

on or off.

Available when:

Installer

A floor sensor or room sensor is installed on the

auxiliary sensor input.

Auto,

OFF or On

Default = OFF

H1

SYn(Synchronize)

Default =

Sychronize

OFF, 1 to 16 Installer

On or Off

Default = On

Display Range Access Description Set to

ADJUST

Settings (6 of 7)

SUPPLY

ADJUST

Continued on next page.

13 of 24 © 2011 D 538 - 12/11

AUXILIARY SENSOR

ADJUST

Select the type of auxiliary sensor.

Off = no auxiliary sensor, Room = Indoor Sensor,

Outdoor = Outdoor Sensor, Floor = Slab Sensor, Floor

ADDRESS

®

dSP = Floor sensor reading in upper number field.

Available when:

Auxiliary sensor automatically detected.

tekmarNet

The address is shown in the large number field. “Auto” is

shown in the upper number field when using automatic

addressing.

Press the or the button to manually select

an address.

The address can be returned to automatic “Auto”

addressing when address set above 24.

FLOOR COOLING

heat pump or chiller

®

Connected to a tekmarNet

Select if the thermostat should operate the heating relay

W for radiant floor cooling.

system control.

Available when:

•

ESCAPE

Press the or the button to return to normal

operation.

Installer

Off, Room,

Outdoor, Floor,

Floor dSP

Installer

01 to 24

b:01 to b:24

1:01 to 1:24

(no reset control),

(reset control - boiler),

(reset control - mixing)

Installer

OFF or On

COOL

FLOOR

Default = OFF

Installer

User

None

Display Range Access Description Set to

Settings (7 of 7)

14 o f 24© 2011 D 538 - 12/11

ADJUST

Sequence of Operation

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

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

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

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

Heating Operation

When using only a room temperature sensor, the thermostat operates the heating
system to maintain the Set Room Heat temperature.

When using only a floor temperature sensor, the thermostat operates the heating
system to maintain the Set Floor Heat temperature. In this case, the thermostat
does not try to control the air temperature. This is ideal for bathrooms and some
kitchen applications where the customer wants their feet to feel warm on the floor.
This is also ideal for garages so that the heating system is not affected by the
opening of the garage door in cold outdoor weather.

When using both a room temperature sensor and a floor temperature sensor, the
thermostat always maintains the Floor Minimum temperature, even when the air
temperature is satisfied. When the air temperature is below the Set Room Heat
temperature, the thermostat operates the heating system to maintain the Set Room
Heat temperature. The floor is never heated above the Floor Maximum setting in
order to protect the floor covering.

The H1 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 Set Room Heat temperature.

Freeze Protection

The thermostat operates the heat whenever the room or floor temperature falls
below 40°F (4.5°C).

Exercising

When connected to a tekmarNet® reset control, the thermostat exercises the heat
relay for 10 seconds every 3 days. Exercising helps prevent zone valves or zone
pumps from failing due to precipitate buildup. During exercising, the thermostat
shows “TEST” on the display.

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

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

Section A

Flushing

The flushing feature is for open-loop systems that use a domestic hot water tank
as a heat source. Flushing ensures that fresh potable water is circulated through
the system once each day. If the thermostat is connected to a tekmarNet® reset
control with the Flushing feature turned on, the thermostat display will display the
“FLUSH” icon for the duration of the flushing operation.

Hydronic System Supply Pump

When connected to a tekmarNet® system control, the thermostat’s Heat Supply
Pump setting affects how the primary pump or mix pump on the system control
operates. When connected to the boiler bus, the boiler system or primary pump is
operated. When connected to the mix bus, the mix system pump is operated.

If the thermostat operates a motorized or thermal motor zone valve, the Heat Supply
Pump setting should be set to On.

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

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

15 of 24 © 2011 D 538 - 12/11

If the thermostat operates a thermal motor (wax actuator) zone valve, set the Heat

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

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

Supply Pump Delay setting to On. This provides a three minute delay to allow the
zone valve to open before the primary or mix pump is turned on.

In special applications with multiple zoning manifolds, the Heat Supply Pump setting
can be set to Off. This allows a Zone Group Pump located on the Zone Manager,
or Wiring Center to operate the pump for the manifold.

DHW Tank Priority

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

When a tekmarNet® reset control is heating an indirect Domestic Hot Water (DHW)
tank, the thermostat may shut off the heating zones to allow the DHW tank to recover
quickly. This is determined by the DHW priority of the tekmarNet® reset control.

Warm Weather Shut Down

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

When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD)
setting on the tekmarNet® reset control, the heating system is shut off.

Air Group Operation

Section B

In order to prevent heating and cooling at the same time, this thermostat can operate
together with other thermostats on a tekmarNet® system to form an air group.

In an air group, one thermostat is assigned as the air group master. The air group
master operates the cooling equipment for the group. This thermostat can be set
to be a member of the air group.

When operating as an air group, the air temperature readings of all the air group
member thermostats are communicated to the air group master and a temperature
average is determined.

Air Group

When the air group master is in cooling
operation, the air group member thermostats
do not operate the heating system for air
heating.

If the Set Room Heat temperature is adjusted
while the air group is cooling, the snowflake
icon is flashed to alert the user that the cooling
is presently on. Once the cooling shuts off,
the heating can start operation.

Master

tekmarNet Communication

MemberMember

Floor Cooling

Section C

The thermostat has the option to support radiant floor cooling when connected to a
heat pump control using tekmarNet® communication. The floor cooling setting must
be set to On and the heating system must be in Warm Weather Shut Down (WWSD).
When the heat pump system control operates in cooling mode, all thermostats set for
floor cooling on the tekmarNet® bus all activate the first stage heating contact (H1)
at the same time to allow chilled water into the system. The thermostat continues
to operate the cooling until either the room temperature reaches the Set Heat
temperature plus 3°F (Set Heat+1.5°C) or reaches a minimum temperature of 74°F.
If only a floor sensor is installed, the floor cooling setpoint is 67°F (19.5°C).

16 of 24© 2011 D 538 - 12/11

Schedules

Section D

Lowering the room temperature setting reduces the amount of fuel required to heat
the building resulting in energy savings.

This thermostat can follow a programmable schedule in order to automatically lower
the room temperature setting. A schedule master such as a Timer 033 is required
in order to gain programmable schedule functionality.

When operating on a programmable schedule, a

symbol is shown, as well as a

or a . The or indicates the current operating temperature.

If a symbol does not appear, there is no schedule available.

Display Action

Occupied temperature. No schedule.

Unoccupied temperature. No schedule.

Programmable schedule at

Programmable schedule at

occupied

unoccupied

temperature.

temperature.

When a programmable schedule is selected, there is a time delay for the temperature
to change from the temperature to the temperature.

The thermostat uses Optimum Start to predict the heat up and cool off rate of
the room. The optimum start feature allows the room to reach the set room
temperature by the time set in the programmable schedule. This applies for both
heating and cooling.

Scenes (System Override)

Section E

Scenes provide an easy way to save energy while away on vacation, or override a
pre-set schedule when plans change. tekmarNet® devices such as a User Switch
479 provide scene adjustment.

This thermostat responds to the following scenes:

Scene Display Room Temperature Setting

1

2

or or

Away

Follows programmable schedule or
operates at the occupied temperature.

Away temperature.

3

Unoccupied temperature.

While in the Away scene, the room temperature cannot be changed using the or

buttons. Change the scene from Away to or to change the temperature.

17 of 24 © 2011 D 538 - 12/11

®

system control.

4 bus, press the and buttons

®

®

bus is at 24 or lower.

®

bus has exceeded 24. Devices include tekmarNet

®

buses.

®

Troubleshooting

4 communication bus has either an open or a short circuit. The result is that there

®

CONTROL ERROR

The thermostat was unable to correctly read settings from memory and has reloaded the factory

default settings. The thermostat does not operate the heating, cooling, or the fan while this error

message is present.

Error clears once all adjust menu settings in the Installer access level (unlocked) have been

checked. Set thermostat’s switch setting #3 to unlock and unlock the tekmarNet

Then press and hold and buttons together for 2 seconds to enter the adjust menu. Continue

until all settings have been reviewed.

BUS ERROR

The tekmarNet

are no communications. Check for loose wires. Check for short circuits between the tN4 and C

wires on the House Control, Wiring Center, or Zone Manager. Check for correct polarity between

the C and R wires.

Error clears automatically once wiring fault has been corrected.

If the thermostat is intentionally removed from the tekmarNet

together to clear the error message.

DEVICE LIMIT

The number of devices on the tekmarNet

Thermostats and Setpoint Controls. The device count must be lowered to 24 or less. If possible,

move devices to other tekmarNet

Error clears automatically once the number of devices on the tekmarNet

Error Message Description

Error Messages (1 of 4)

18 of 24© 2011 D 538 - 12/11

address.

®

your wholesaler or tekmar sales representative for details on repair procedures.

ADDRESS ERROR

This thermostat and another device have been manually given the same tekmarNet

Error clears automatically once this thermostat is given a new manually set address or if the

thermostat is set to automatic addressing.

ROOM SENSOR SHORT CIRCUIT

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.

ROOM SENSOR OPEN CIRCUIT

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

AIR GROUP MEMBER ERROR

The thermostat has been selected to join an air group as a member, yet there is no air group master

thermostat.

Error clears once the thermostat detects an air group master or the air group is set to OFF.

Error Message Description

Error Messages (2 of 4)

19 of 24 © 2011 D 538 - 12/11

FLOOR SENSOR SHORT CIRCUIT

The auxiliary floor sensor has a short circuit. Check for damaged wires. Locate and repair the

problem as described in the Data Brochure D072 or D 079.

Error clears once the floor sensor fault is corrected.

FLOOR SENSOR OPEN CIRCUIT

The auxiliary floor sensor has an open circuit. Check for loose or damaged wires. Locate and repair

the problem as described in the Data Brochure D072 or D 079.

Error clears once the floor sensor fault is corrected.

If the floor sensor was intentionally removed, locate the Room Sensor setting in the Adjust menu

and set to On. Power the thermostat down and up to clear the error.

OUTDOOR SENSOR SHORT CIRCUIT

The auxiliary outdoor sensor has a short circuit. Check for damaged wires. Locate and repair the

problem as described in the Data Brochure D 070.

Error clears after the outdoor sensor fault is corrected.

OUTDOOR SENSOR OPEN CIRCUIT

The auxiliary outdoor sensor has an open circuit. Check for loose or damaged wires. Locate and

repair the problem as described in the Data Brochure D 070.

Error clears once the outdoor sensor fault is corrected.

If the outdoor sensor was intentionally removed, power the thermostat down and up to clear the

error.

Error Message Description

Error Messages (3 of 4)

20 of 24© 2011 D 538 - 12/11

AUXILIARY ROOM SENSOR SHORT CIRCUIT

The auxiliary room sensor has a short circuit. Check for damaged wires. Locate and repair the

problem as described in the Data Brochure D 076, D077, or D084.

Error clears after the auxiliary room sensor fault is corrected.

AUXILIARY ROOM SENSOR OPEN CIRCUIT

The auxiliary room sensor has an open circuit. Check for loose or damaged wires. Locate and repair

the problem as described in the Data Brochure D 076, D077, or D084.

Error clears once the auxiliary room sensor fault is corrected.

If the auxiliary room sensor was intentionally removed, power the thermostat down and up to clear

the error.

Error Message Description

Error Messages (4 of 4)

21 of 24 © 2011 D 538 - 12/11

Frequently Asked Questions

Symptom Look for... Corrective Action

No Heat

Heat on before
scheduled time

Pressing
button does
not increase
temperature

Pressing
button does
not decrease
temperature

H1 Symbol

Flashing

WWSD

H1 symbol indicates heat is on. Check if
zone valve or zone pump is operating.

Increase WWSD setting on tekmarNet®
reset control.

Flashing Away Change User Switch to Normal scene 1.

Optimum start “learns” the heat up and
cool off rate of the room and starts the
heating or cooling early so that the room is
comfortable at the scheduled time.

Flashing Max

Installer can increase the Maximum Set
Room Heat.

Floor temperature has reached the Floor

Flashing Floor

Max

Maximum setting. If the floor is not heated,
then the floor sensor may be faulty and
require replacement.

Flashing Min

Installer can decrease the Minimum Set
Room Heat.

Floor minimum takes priority over the air

Floor Min

heating temperature. Recommend turning
down the floor minimum temperature
setting.

22 of 24© 2011 D 538 - 12/11

Job Record

Jobsite Location ________________________________________________

Thermostat Location _____________________________________________

Item Setting Item Setting

Set Room Heat

Set Room Heat Set Floor Max

Set Room Heat Away Schedule Member

Set Floor Heat

Set Floor Heat Heat Supply Pump Delay

Backlight Heat Cycles Per Hour

Units Air Group

Max Set Room Heat

Max Set Room Heat Sensor

Min Set Room Heat tekmarNet® Address

Set Floor Min

Set Floor Min

Heat Supply Pump

Room Sensor

Floor Cooling

Technic al Dat a

tekmarNet®4 Thermostat 538; One Stage Heat

Packaged weight 0.8 lb. (380 g)

Enclosure White PVC plastic, NEMA Type 1

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

Approvals CSA C US, meets Class B: ICES and FCC Part 15

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

W Relay 24 V (ac) 2 A

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

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

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

23 of 24 © 2011 D 538 - 12/11

Limited Warranty and Product Return Procedure

Limited Warranty The liability of tekmar und er this warranty is limited. The Purchas er, by taking receipt

of any tekmar product (“Product”), acknowledges th e terms of the Limited Warranty in effect at the time
of such Product s ale and acknowledges that it has read and unde rstands same.

The tekmar Limited Warranty to the Purchaser on the Products sold hereunder is a manufacturer’s pass­through warranty which the Purchaser is authorized to pass through to its customers. Under the Limited
Warranty, each tekmar Product is warranted against defects in workmanship and materials if the Product
is installed and used in compliance with tekmar’s instructions, ordinary wear and tear excepted. The pass­through warranty period is for a period of twenty-four (24) months from the production date if the Product is
not installed during that period, or twelve (12) months from the documented date of installation if installed
within twenty-four (24) months from the production date.

The liability of tekmar under the Limited Warranty shall be limited to, at tekmar’s sole discretion: the cost of par ts
and labor provided by tekmar to repair defects in materials and / or workmanship of the defective product; or to
the exchange of the defective product for a warranty replacement produc t; or to the granting of credit limited to
the original cost of the defective product, and such repair, exchange or credit shall be the sole remedy available
from tekmar, and, without limiting the foregoing in any way, tekmar is not responsible, in c ontract, tor t or strict
product liabilit y, for any other losses, costs, expenses, inconveniences, or damages, whether direct, indirect,
special, secondar y, incidental or c onsequential, arising from ownership or use of the product, or from defects in
workmanship or materials, including any liability for fundamental breach of contract.

The pass-through Limited Warranty applies only to those defective Products returned to tekmar during the war­ranty period. This Limited Warranty does not cover the c ost of the parts or labor to remove or transport the defec­tive Product, or to reinstall the repaired or replacement Product, all such costs and expenses being subject to
Purchaser’s agreement and warranty with its customers.

Any representations or warranties about the Products made by Purchaser to its customers which are dif ferent
from or in excess of the tekmar Limited Warranty are the Purchaser’s sole responsibility and obligation. Purchaser
shall indemnify and hold tekmar harmless from and against any and all claims, liabilities and damages of any
kind or nature which arise out of or are relate d to any such representations or warranties by Purchaser to its
customers.

The pass-through Limited Warranty does not apply if the returned Product has been damaged by negligence by
persons other than tekmar, accident, fire, Act of God, abuse or misuse; or has been damaged by modifications,
alterations or attachments made subsequent to purchase which have not been authorized by tekmar; or if the
Product was not installed in compliance with tekmar’s instructions and / or the local codes and ordinances; or if
due to defective installation of the Product; or if the Product was not used in compliance with tek mar’s instruc­tions.

THIS WARRANT Y IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IM PLIED, WHICH THE GOVERNIN G
LAW ALLOWS PARTIES TO CONTRACTUALLY EXCLUDE, INCLUDING , WITHOUT LIMITATION, IMPLIED WAR­RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DURABILITY OR DESCRIP­TION OF THE PRODUCT, ITS NON-INFRINGEMENT OF ANY RELEVANT PATENTS OR TRADEMARKS, AND
ITS C OMPLI AN CE WI TH OR NON -VIO L ATI ON O F A NY APPLIC AB LE EN VI RONME NTA L, HE ALTH O R S AFET Y
LEGISLATION; THE TERM OF ANY OTHER WARRANT Y NOT HEREBY CONTRACTUALLY EXCLUDED IS LIM­ITED SUCH THAT IT SHALL NOT EXTEND BEYOND TWENTY-FOUR (24) MONTHS FROM THE PRODUCTION
DATE, TO THE EXTENT THAT SUCH LIMITATION IS ALLOWED BY THE GOVERNING LAW.

Product Warranty Return Procedure All Products that are believed to have defects in workmanship or materi­als must be returned, together with a written description of the defect, to the tekmar Representative assigned to
the territory in which such Product is located. If tekmar receives an inquiry from someone other than a tekmar
Representative, including an inquir y from Purchaser (if not a tekmar Representative) or Purchaser’s customers,
regarding a potential warranty claim, tekmar’s sole obligation shall be to provide the address and other contact
information regarding the appropriate Representative.

tekmar Control Syste ms Ltd., Canada
tekmar Contr ol Syste ms, Inc ., U.S.A.

Head O ffice: 5100 Si lver St ar Roa d
Vernon, B.C. Can ada V1B 3K4
(250) 54 5-7749 Fax. [phone]

Web Site: w ww.tek marco ntrols.com

All specifications are subject
to change without notice

Product design, software and literature
are Copyright © 2011 by:
tekmar Control Systems Ltd. and tekmar
Control Systems, Inc.

24 of 24 D 538 - 12/11.