Page 1
tekmarNet®4 Thermostat 538
Installation & Operation Manual
D538
12/11
Zoning
Replaces:08/10
1 of 24 © 2011
D 538 - 12/11
The tekmarNet®4 Thermostat 538
provides operation for:
One Stage Heat•
Introduction
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
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2 of 24© 2011 D 538 - 12/11
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•
Tool s Re qui red
------------------------------------------------------
------------------------------------------------------
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
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
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.
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3 of 24 © 2011 D 538 - 12/11
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.
•
•
•
•
•
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•
•
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Installation Location
-------------------------------------------------
-------------------------------------------------
Removing The Thermostat Base
Push
tab
1
Remove thermostat
from base
2
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
3
1
/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
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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
2
3
/8”
(60 mm)
screwhole
2
3
/8”
(60 mm)
screwhole
Thermostat
Base
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.
12 34
tN4 Wiring Center
or
tN4 Zone Manager
Slab Sensor 072, 073, 079
OR
Outdoor Sensor 070
OR
Indoor Sensor 076, 077, 084
tN4 C W
R
1234
tNt 538
538
One Stage Heat
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
Relay: 24 V (ac) 2 A
1001- 03
tN41C2R3W
4
65
Sensor
Switch Settings:
For instructions see brochure
Use at least 75°C conductors
Setback
Scene
Lock
Not used
ON
Not used
Unlock
Off
Off
No Power
Testing the Thermostat Wiring
Testing th e 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.
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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
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 th e tek marNet®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.
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Switch Settings
Switches are set to “On”
position from the factory, and
do not require changing for
most applications.
12 34
1234
tNt 538
538
One Stage Heat
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
Relay: 24 V (ac) 2 A
1001-03
tN41C2R3W
4
65
Sensor
Switch Settings:
For instructions see brochure
Use at least 75°C conductors
Setback
Scene
Lock
Not used
ON
Not used
Unlock
Off
Off
No Power
12 34
1234
Mmm YYY
L t # 1234
Meets Class B:
Canadian ICES
2 A
Switch Settings:
Setback
Scene
Lock
Not used
ON
Not used
Unlock
Off
Off
Switch
Position
Action
1
ON
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.
2
ON
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.
3
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).
4
ON
Not used
OFF
Not used
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
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SECONDARY DISPLAYMAIN DISPLAY
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.
Display
Symbols Description
User Interface
Button Operation
Press the or the button to select the room temperature.
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Settings (1 of 7)
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 #3 and tekmarNet
®
system control to Unlock to change Access level to Installer.
Press
+
Together
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9 of 24 © 2011 D 538 - 12/11
Settings (2 of 7)
Display Range Access Description Set to
40 to 122°F
(4.5 to 50.0°C)
Default = 72°F
(22.0°C)
Installer
User
SET FLOOR HEAT
Set the floor heating temperature while in the
event.
Available when:
A slab sensor is installed on the auxiliary sensor
input AND Sensor setting in the Adjust menu is set
to Floor AND Room Sensor setting in the Adjust
menu is set to Off.
•
40 to 122°F
(4.5 to 50.0°C)
Default = 65°F
(18.5°C)
Installer
User
SET FLOOR HEAT
Set the floor heating temperature while in the
event.
Available when:
A slab sensor is installed on the auxiliary sensor
input AND Sensor setting in the Adjust menu is set
to Floor AND Room Sensor setting in the Adjust
menu is set to Off.
•
Off, 30 sec, On,
On +
Default = 30 sec
Installer
User
BACKLIGHT
Select the backlight operation.
Off = Permanently Off
30 = Temporary on for 30 seconds
On = Permanently On
On + = On during and off during
Continued on next page.
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Display Range Access Description Set to
°F or °C
Default = °F
Installer
User
TEMPERATURE UNITS
Press the or the button to change from °F to
°C and vice versa.
Device Type with
Software Version,
Address
Installer
User
DEVICE TYPE
Display alternates between the Device Type (large
number) with Software Version (upper right corner)
and the thermostat address.
40 to 95°F
(4.5 to 35.0°C)
Default = 85°F
(29.5°C)
Installer
MAXIMUM SET ROOM HEAT
Set the maximum room heating limit while in the
event.
40 to 95°F
(4.5 to 35.0°C)
Default = 85°F
(29.5°C)
Installer
MAXIMUM SET ROOM HEAT
Set the maximum room heating limit while in the
event.
40 to 95°F
(4.5 to 35.0°C)
Default = 45°F
(7.0°C)
Installer
MINIMUM SET ROOM HEAT
Set the minimum room heating limit.
Settings (3 of 7)
Continued on next page.
Page 11
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Display Range Access Description Set to
Off, 40 to 122°F
(Off, 4.5 to
50.0°C)
Default = 72°F
(22.0°C)
Installer
User
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, 40 to 122°F
(Off, 4.5 to
50.0°C)
Default = Off
Installer
User
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.
•
•
•
Settings (4 of 7)
Continued on next page.
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12 of 24© 2011 D 538 - 12/11
Display Range Access Description Set to
40 to 122°F, Off
(4.5 to 50.0°C,
Off)
Default = 85°F
(29.5°C)
Installer
FLOOR MAXIMUM
Set the floor maximum temperature in order to protect
the floor covering.
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.
•
•
•
1, 2, 3, 4
Default = 1
Installer
SCHEDULE
Thermostat can follow schedule master 1, 2, 3, or 4.
Available when:
Switch setting 1 is set to Setback (On Position).•
H1
H1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = On
Installer
HEAT SUPPLY PUMP
During heating, select whether or not the system supply
pump should turn on or be off to allow a zone group
pump per manifold.
Available when:
A reset control is present on the tekmarNet
®
system.•
Settings (5 of 7)
Continued on next page.
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Display Range Access Description Set to
H1
H1
ADJUST
ADJUST
SUPPLY
OFF or On
Default = OFF
Installer
HEAT SUPPLY PUMP DELAY
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:
A reset control is present on the tekmarNet
®
system.•
Auto,
SYn(Synchronize)
Default =
Sychronize
Installer
HEAT CYCLES PER HOUR
Select either Auto cycle or Synchronize with other
thermostats on the tekmarNet
®
system.
Choose Synchronize when zone heated using a boiler.
Choose Auto when zone is non-hydronic heating.
Available when:
No reset control on the tekmarNet
®
system.•
ADJUST
ADJUST
OFF, 1 to 16 Installer
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.
Available when:
The thermostat is connected to other thermostats
using tekmarNet
®
.
•
On or Off
Default = On
Installer
ROOM SENSOR
Select whether the built-in air temperature sensor is
on or off.
Available when:
A floor sensor or room sensor is installed on the
auxiliary sensor input.
Settings (6 of 7)
Continued on next page.
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Display Range Access Description Set to
Off, Room,
Outdoor, Floor,
Floor dSP
Installer
AUXILIARY SENSOR
Select the type of auxiliary sensor.
Off = no auxiliary sensor, Room = Indoor Sensor,
Outdoor = Outdoor Sensor, Floor = Slab Sensor, Floor
dSP = Floor sensor reading in upper number field.
Available when:
Auxiliary sensor automatically detected.
01 to 24
(no reset control),
b:01 to b:24
(reset control - boiler),
1:01 to 1:24
(reset control - mixing)
Installer
tekmarNet
®
ADDRESS
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
ADJUST
ADJUST
COOL
OFF or On
Default = OFF
Installer
FLOOR COOLING
Select if the thermostat should operate the heating relay
W for radiant floor cooling.
Available when:
Connected to a tekmarNet
®
heat pump or chiller
system control.
•
None
Installer
User
ESCAPE
Press the or the button to return to normal
operation.
Settings (7 of 7)
Page 15
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Heating Operation
Section A
Sequence of 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.
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.
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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.
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.
Air Group
Master
MemberMember
tekmarNet Communication
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).
Page 17
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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
occupied
temperature.
Programmable schedule at
unoccupied
temperature.
Scene Display Room Temperature Setting
1
or or
Follows programmable schedule or
operates at the occupied temperature.
2
Away
Away temperature.
3
Unoccupied temperature.
Scenes (System Override)
Section E
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 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:
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.
Page 18
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Troubleshooting
Error Messages (1 of 4)
Error Message Description
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
®
system control.
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
®
4 communication bus has either an open or a short circuit. The result is that there
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
®
4 bus, press the and buttons
together to clear the error message.
DEVICE LIMIT
The number of devices on the tekmarNet
®
bus has exceeded 24. Devices include tekmarNet
®
Thermostats and Setpoint Controls. The device count must be lowered to 24 or less. If possible,
move devices to other tekmarNet
®
buses.
Error clears automatically once the number of devices on the tekmarNet
®
bus is at 24 or lower.
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Error Messages (2 of 4)
Error Message Description
ADDRESS ERROR
This thermostat and another device have been manually given the same tekmarNet
®
address.
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
your wholesaler or tekmar sales representative for details on repair procedures.
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.
Page 20
20 of 24© 2011 D 538 - 12/11
Error Message Description
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 Messages (3 of 4)
Page 21
21 of 24 © 2011 D 538 - 12/11
Error Message Description
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 Messages (4 of 4)
Page 22
22 of 24© 2011 D 538 - 12/11
Symptom Look for... Corrective Action
No Heat
H1 Symbol
H1 symbol indicates heat is on. Check if
zone valve or zone pump is operating.
Flashing
WWSD
Increase WWSD setting on tekmarNet®
reset control.
Flashing Away Change User Switch to Normal scene 1.
Heat on before
scheduled time
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.
Pressing
button does
not increase
temperature
Flashing Max
Installer can increase the Maximum Set
Room Heat.
Flashing Floor
Max
Floor temperature has reached the Floor
Maximum setting. If the floor is not heated,
then the floor sensor may be faulty and
require replacement.
Pressing
button does
not decrease
temperature
Flashing Min
Installer can decrease the Minimum Set
Room Heat.
Floor Min
Floor minimum takes priority over the air
heating temperature. Recommend turning
down the floor minimum temperature
setting.
Frequently Asked Questions
Page 23
23 of 24 © 2011 D 538 - 12/11
Technical Data
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
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
Sensors: NTC thermistor, 10 kΩ @ 77°F (25°C ± 0.2°C) ß = 3892
– Optional tekmar type # 070, 072, 073, 076, 077, 079, 084
Job Record
Jobsite Location ________________________________________________
Thermostat Location _____________________________________________
Item Setting Item Setting
Set Room Heat
Set Floor Min
Set Room Heat Set Floor Max
Set Room Heat Away Schedule Member
Set Floor Heat
Heat Supply Pump
Set Floor Heat Heat Supply Pump Delay
Backlight Heat Cycles Per Hour
Units Air Group
Max Set Room Heat
Room Sensor
Max Set Room Heat Sensor
Min Set Room Heat tekmarNet® Address
Set Floor Min
Floor Cooling
Page 24
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
Product design, software and literature
are Copyright © 2011 by:
tekmar Control Systems Ltd. and tekmar
Control Systems, Inc.
All specifications are subject
to change without notice
24 of 24 D 538 - 12/11.
Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking receipt
of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at the time
of such Product sale and acknowledges that it has read and understands 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 parts
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 product; 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 contract, tort or strict
product liability, for any other losses, costs, expenses, inconveniences, or damages, whether direct, indirect,
special, secondary, incidental or consequential, 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 cost 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 different
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 related 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 tekmar’s instructions.
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, WHICH THE GOVERNING
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 CO M PLIANCE WIT H OR N O N -VIOLATI O N OF A NY APPLICA BLE ENVIRONMENTAL , HEALTH O R SAFETY
LEGISLATION; THE TERM OF ANY OTHER WARRANTY 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 inquiry 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.
Limited Warranty and Product Return Procedure
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