Tekmar 541 User manual

1 of 24 © 2007 D541 - 08/07
D541
08/07
tekmarNet®4 Thermostat 541
- Data Brochure
Information
Brochure
Choose controls
to match
application
1Application
Brochure
Design your
mechanical
applications
2Rough In
Wiring
Rough-in
wiring
instructions
3Wiring
Brochure
Wiring and
installation of
specific control
4Job
Record
Record settings &
wiring details for
future reference
6
Data
Brochure
Control settings
and sequence of
operation
5
•
• tN4 Compatible
•
• 1 Auxiliary Temperature Sensor Input
•
• Pulse Width Modulation
•
• Scenes
The tekmarNet®4 thermostat 541 operates one stage of heating equipment. The 541 can operate as a stand alone device,
or communicate with a group of tekmarNet®4 thermostats.
Introduction
Features

© 2007 D541 - 08/07 2 of 24
Table of Contents
Table of Contents............................................................2
Display and DIP Switches ..............................................2
Dip Switches ...........................................................2
Access Levels .........................................................3
Display and Symbols Description............................3
User Interface .........................................................4
Setup ..............................................................................5
View Menu .............................................................5
Adjust Menu............................................................6
Scene Menu............................................................8
Schedule Menu.......................................................9
Miscellaneous Menu ..............................................9
Thermostat Operation .................................................. 11
Auxiliary Sensors ................................................. 11
Mode of Operation ............................................... 11
Adjusting the Temperature ...................................12
Cycles Per Hour ................................................... 13
Heating Terminal Units .........................................13
Heating Operation ................................................ 14
Cool Groups .........................................................15
Setting the Schedule.............................................15
Optimum Start / Stop ...........................................15
Scenes .................................................................16
Away Hold ............................................................ 17
Offset ................................................................... 17
Units of Temperature ............................................ 17
Backlight .............................................................. 17
tN4 Address ......................................................... 17
Pump Exercising ................................................... 17
Error Messages ............................................................18
Cleaning the Thermostat .............................................24
Warranty.......................................................................24
Display and DIP Switches
Dip Switches
tN4 System Control (DIP Switch #2)
A tN4 System Control is a control, not a thermostat, that
the 541 thermostat connects to through the tN4 bus. All
tN4 compatible Outdoor Reset Modules are tN4 System
Controls.
•
• If the thermostat is connected to a tN4 System Control,
set the tN4 System Control DIP switch to tN4 System
Control (down position).
•
• If the thermostat is not connected to a tN4 System
Control, set the tN4 System Control DIP switch to None
(up position).
Lock/Unlock (DIP Switch #1)
Use the Lock/Unlock DIP switch to lock or unlock the
Access Level of the 541.
•
• To unlock the Access Level, set the DIP switch to the
unlocked (down) position.
•
• To lock the Access Level, set the DIP switch to the locked
(up) position. Once locked, a padlock is displayed in the
lower right corner of the display and the Access Level
cannot be changed.
Note: The tN4 System Control’s Lock/Unlock DIP switch
overrides the Lock/Unlock DIP switch on the 541. Set
the tN4 System Control’s Lock/Unlock DIP switch to the
Unlock position before Access Levels can be changed on
the thermostat.

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Access Levels
The Access Level restricts the number of Menus, Items
and Adjustments that can be accessed by the user. The
Access Level setting is found in the Miscellaneous (MISC)
menu. Select the appropriate access level for the people
who work with the thermostat on a regular basis.
The 541 has five Access Levels:
•
• Advanced (ADV): access to all settings
•
• Installer (INST): settings required for installation
•
• User (USER): for property owners
•
• Limited (LTD): limited temperature adjustment
•
• Secure (SEC): for commercial and public installations
For more information, see the Misc (Miscellaneous) Menu
section.
In the following menu tables, the access level the item is
visible in is shown in the access column.
To adjust the Access Level:
1. Set the Unlock/Lock DIP switch to the unlock position.
If a tN4 System Control is connected to the 541, the
Unlock/Lock DIP switch on the tN4 System Control
must be set to the unlock position.
2. Use the Menu button to select the Misc menu.
3. Use the Item button to select the Access menu item.
4. Use the Up and Down button to select the required
Access Level.
Display
Item Field
Displays an abbreviated
name of the selected item
Number Field
Displays the current value
of the selected item
Status Field
Displays the current status
of the control’s inputs,
outputs and operation
Menu Field
Displays the
current menu
Symbols Description
MODE OF OPERATION
Displays whether the device is in heating
mode.
FIRST STAGE HEAT
First stage heating is operating.
tN4 COMMUNICATION
A tN4 network is detected.
LOCK
The Access Levels are locked. A menu
option is visible but not adjustable.
OPTIMUM START / STOP
The Optimum Start or Optimum Stop
feature is active.
WARNING
An error is present.
TEMPORARY HOLD
The temperature has been temporarily
adjusted from the scheduled event.
SCHEDULED EVENT
Displays the current scheduled event.

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User Interface
Use the User Interface available on the Liquid Crystal Display
(LCD) to setup and monitor the operation of the thermostat.
Use the four push buttons below the LCD (Menu, Item, Up,
Down) to select settings. As you enter settings, record the
settings in the Job Record J541.
Menu
The menus display in the Menu Field at the left of the
LCD.
Five menus are available:
Adjusting a Setting
To adjust a setting:
1. Use the Menu button to select the appropriate menu.
2. Use the Item button to select a menu item.
3. Use the Up or Down button to adjust the setting.
Default Item
•
• To set the default item in the View Menu, display the
item for more than five seconds.
After navigating menus, the display reverts back to the
default item after 60 seconds of button inactivity.
Copy Settings
To save time in setting thermostats, you can copy the settings
from one tN4 thermostat to a second tN4 thermostat.
Refer to the COPY item in the Misc menu on page 10.
•
• View
•
• Adjust
•
• Scene
•
• Schedule
•
• Miscellaneous
To select a menu, press and release the Menu button.
Item
In each menu, a group of items can be selected. The
abbreviated name of the selected item displays in the Item
field of the LCD display.
•
• To view the next available item, press and release the
Item button.
•
• To view the previous item, hold down the Item button
and press and release the Up button.
Continue
to next Item
Continue to next Menu
Continue
to next Item

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Display Menus
View Menu (1 of 1)
Item Field Range Access Description
-58 to 212°F
(-50.0 to 100.0°C)
SEC
LTD
USER
INST
ADV
ROOM SECTION A
Current air temperature in the room.
Note: This item is only available when the Room
Sensor is set to On or the Auxiliary Sensor is set to
Room.
– – –, 40 to 95°F
(– – –, 4.5 to 35.0°C)
USER
INST
ADV
ROOM SET SECTION A
Selected room temperature.
Note: This item is only available when the Room
Sensor is set to On or the Auxiliary Sensor is set to
Room.
– – – (if no recent
message),
-58 to 212°F
(-50.0 to 100.0°C)
SEC
LTD
USER
INST
ADV
OUTDOOR SECTION A
Current temperature at the outdoor sensor.
Note: This item is only available when an outdoor
sensor is connected to the tN4 network.
-58 to 212°F
(-50.0 to 100.0°C)
SEC
LTD
USER
INST
ADV
FLOOR SECTION A
Current floor temperature.
Note: This item is only available when the Auxiliary
Sensor is set to Floor.
-22 to 266°F
(-30.0 to 130.0°C)
INST
ADV
SUPPLY TEMPERATURE OF TN4 BUS SECTION F
Actual water temperature of the tN4 bus for the first
stage of heat.
Note: This item is only available when the thermostat
is connected to an Outdoor Reset Module and the
DIP switch is set to tN4 System Control.
The View menu items display the current operating
temperatures and status information of the system.
VIEW MENU
After the last item, the control returns to the first item in the menu.

© 2007 D541 - 08/07 6 of 24
Item Field Range Access Description
OFF, HEAT,
Default = HEAT
USER
INST
ADV
MODE OF OPERATION SECTION B
Mode of operation of the thermostat.
40 to 95°F
(4.5 to 35.0°C)
LTD
USER
INST
ADV
SET HEAT SECTION C
Selected air heating temperature for each event.
Note: At the Limited Access Level, you can only
adjust the temperature +/-3°F (1.5°C) from the last
setting.
Wake
Default = 70°F (21.0°C)
UnOccupied
Default = 62°F (16.5°C)
Occupied
Default = 70°F (21.0°C)
Sleep
Default = 62°F (16.5°C)
Away
Default = 62°F (16.5°C)
OFF, 40 to 122°F
(OFF, 4.5 to 50.0°C)
LTD
USER
INST
ADV
FLOOR MINIMUM SECTION A
Select the minimum floor temperature for each
event.
Note: This item is only available when the Auxiliary
Sensor is set to Floor. At the Limited Access Level,
you can only adjust the temperature +/-3°F (1.5°C)
from the last setting.
Wake
Default = 70°F (21.0°C)
UnOccupied
Default = OFF
Occupied
Default = 70°F (21.0°C)
Sleep
Default = OFF
40 to 122°F
(4.5 to 50.0°C)
Default = 85°F
(29.5°C)
ADV
FLOOR MAXIMUM SECTION A
Maximum floor temperature.
Note: This item is only available when Sensor 1 is
set to Floor.
OFF, ROOM,
FLOR (Floor),
OUT (Outdoor)
Default = OFF
INST
ADV
SENSOR SECTION A
Select the type of sensor connected to the auxiliary
sensor input.
Adjust Menu (1 of 2)
The Adjust Menu items are the programmable settings
used to operate the mechanical equipment.
Continued on next page.
ADJUST MENU

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Item Field Range Access Description
OFF, ON
Default = ON
INST
ADV
ROOM SENSOR SECTION A
Selects whether the built-in room sensor is functional.
SYNC, AUTO
2 to 12
Default = AUTO
ADV
HEAT CYCLES PER HOUR SECTION D
Select the number of heating cycles per hour. SYNC
results in 5 CPH. All tN4 thermostats that are connected
and have the SYNC setting selected synchronize their
cycle to the same starting time.
Note: This item is only available when the tN4 System
Control DIP switch is set to None.
CTRL, HRF1, HRF2,
COIL, CONV, RAD,
BASE, OTHR
Default =CTRL
INST
ADV
HEAT 1 TERMINAL SECTION E
Select the type of heating terminal.
Note: If CTRL is selected, the terminal unit selected
on the tN4 System Control is used.
OFF, ON
Default = ON
INST
ADV
HEAT 1 PUMP SECTION F
Select whether the system, primary, or mixing pump
on a tN4 System Control must operate while the heat
is operating.
Note: This item is only available when the H1 Terminal
item is set to CTRL, HRF1, HRF2, Fan Coil, Convector,
Radiator, or Baseboard.
OFF, ON
Default = OFF
INST
ADV
HEAT 1 DELAY SECTION F
Select whether the system, primary, or mixing pump
on a tN4 System Control is delayed to allow a thermal
motor zone valve to open. Select On for thermal motor,
select Off for zone pump or motorized zone valve.
Note: This item is only available when the H1 Terminal
item is set to CTRL, HRF1, HRF2, Fan Coil, Convector,
Radiator, or Baseboard.
NONE, 1 to 16
Default = NONE ADV
COOL MEMBER SECTION G
Select the cool group of which this thermostat is a
member. Select None if this thermostat is not a cool
group member.
Note: This item is only available when the thermostat
is connected to a tN4 network.
ON, OFF
Default = ON
INST
ADV
OPTIMUM START / STOP SECTION I
Select whether to use Optimum Start/Stop for
heating.
Note: This item is only available when a heating
schedule is selected.
Adjust Menu (2 of 2)
ADJUST MENU
After the last item, the control returns to the first item in the menu.

© 2007 D541 - 08/07 8 of 24
Item Field Range Access Description
Occ, Away,
PERM1, Away 2
PERM UnOcc 3,
PERM 4, PERM5
TMPY Occ 6
TMPY7, TMPY 8
Default = PERM 1
USER
INST
ADV
SELECT SECTION J
Select the scene for the building.
Note: Only Occ and AWAY are available when no
schedule is selected.
Schd
Wake
Occ
UnOcc
Sleep
Away
Default = SCHD
INST
ADV
SET PERMANENT 1 SECTION J
Select an action for the Permanent 1 scene.
Note: This item is only available when SCENE menu
is set to ON and a schedule has been selected.
Schd
Wake
Occ
UnOcc
Sleep
Away
Default = SCHD
INST
ADV
SET PERMANENT 4 SECTION J
Select an action for the Permanent 4 scene.
Note: This item is only available when SCENE menu
is set to ON and a schedule has been selected.
Schd
Wake
Occ
UnOcc
Sleep
Away
Default = SCHD
INST
ADV
SET PERMANENT 5 SECTION J
Select an action for the Permanent 5 scene.
Note: This item is only available when SCENE menu
is set to ON and a schedule has been selected.
Schd
Wake
Occ
UnOcc
Sleep
Away
Default = SCHD
INST
ADV
SET TEMPORARY 7 SECTION J
Select an action for the Temporary 7 scene. The
scene lasts for 4 hours before reverting to the previous
permanent scene.
Note: This item is only available when SCENE menu
is set to ON and a schedule has been selected.
Schd
Wake
Occ
UnOcc
Sleep
Away
Default = SCHD
INST
ADV
SET TEMPORARY 8 SECTION J
Select an action for the Temporary 8 scene. The
scene lasts for 8 hours before reverting to the previous
permanent scene.
Note: This item is only available when SCENE menu
is set to ON and a schedule has been selected.
OFF, ON
Default = OFF
INST
ADV
SCENE MENU SECTION J
Select the Scene feature of the thermostat.
Scene Menu (1 of 1)
The Scene Menu items set the current scene as
well as the scene settings.
SCENE MENU
After the last item, the control returns to the first item in the menu.

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Item Field Range Access Description
NONE,
MBR1, MBR2,
MBR3, MBR4
Default = NONE
USER
INST
ADV
HEAT SCHEDULE SECTION H
If a schedule is not required, select NONE.
If the schedule is set on another thermostat, select
MBR1 to MBR4.
Note: This item can be viewed in the USER and
INST access levels but can only be adjusted in the
ADV access level.
Schedule Menu (1 of 1)
The Schedule menu items set the schedule type, the
number of events per day, and the event times.
SCHEDULE MENU
Item Field Range Access Description
SEC, LTD, USER,
INST, ADV
Default = USER
SEC
LTD
USER
INST
ADV
ACCESS LEVEL
The access level of the thermostat. The access column
shows which items are visible in each access level.
Note: This item is only available when the Lock/Unlock
DIP switch on the thermostat and the tN4 system
control are set to Unlock.
°F, °C
Default = °F
USER
INST
ADV
UNITS SECTION M
Select Fahrenheit or Celsius as the temperature
units.
ON, TMPY, OFF
Default = TMPY
USER
INST
ADV
BACKLIGHT SECTION N
Select whether the backlight displays permanently,
temporarily, or is off. The temporary backlight lasts
for 30 seconds.
Misc (Miscellaneous) Menu (1 of 2)
The Miscellaneous menu items set display and control
options such as access level and temperature units.
Continued on next page.
MISC MENU
After the last item, the control returns to the first item in the menu.

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Item Field Range Access Description
-5.0 to +5.0°F in
0.1°F increments
(-3.0° to +3.0°C in
0.1°C increments)
Default = 0.0°F
ADV OFFSET SECTION L
Fine tune the current room temperature. Adjustments
are in tenths of a degree.
– – –, -bus#:01,
... bus#:24, DEF
Default = – – –
INST
ADV
COPY SETTINGS
Copy settings from another thermostat to this
thermostat.
1. Select the address of the thermostat to copy from.
Select DEF to load the factory default settings.
2.Wait for 3 seconds and then press the Up and Down
buttons for 1 second.
3. The thermostat will show the percentage of progress.
4. Displays DONE if successful or WARN if only part
of the settings were copied.
1 to 24 ADV
NUMBER OF DEVICES
Number of tN4 devices connected to this tN4 bus.
Note: This item is only available when the thermostat
is connected to a tN4 bus.
AUTO, -bus#:01,
... bus#:24
Default = AUTO
SEC
LTD
USER
INST
ADV
ADDRESS SECTION O
The tN4 bus address of this thermostat.
Auto allows the tN4 system to automatically assign
an address to the thermostat.
To manually set the address, use the Up or Down
buttons while in the ADV or INST access level.
Note: This item is only available when the thermostat
is connected to a tN4 bus.
541, Software Version
SEC
LTD
USER
INST
ADV
TYPE
Product number of this thermostat. Hold the Up button
to view the software version.
Misc (Miscellaneous) Menu (2 of 2)
After the last item, the control returns to the first item in the menu.
MISC MENU

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Thermostat Operation
The thermostat has a built-in sensor to measure air temperature
at the thermostat. In addition to the built-in sensor, the
thermostat has terminals to connect one auxiliary sensor.
This sensor can either be a room sensor, floor sensor or
an outdoor sensor.
If the auxiliary sensor is installed, you must make the
appropriate sensor input setting before the thermostat will
recognize the sensor.
•
• Locate the Sensor setting in the Adjust menu.
Auxiliary Sensors Section A
Indoor Sensor 076 Outdoor Sensor 070Indoor Sensor 077 Slab Sensor 079
Room Sensor
A room sensor measures the air temperature in the zone
that the thermostat controls. This measurement is used to
calculate on times for heating operations.
If a built-in sensor reading is not required, the built-in sensor
can be turned off. This removes the built-in sensor from
the temperature average.
Floor Sensor
A floor sensor measures floor temperature in the zone that
the thermostat controls. Floor temperature operates in a
range between the Floor Minimum and Floor Maximum
settings.
•
• Locate the Floor Minimum and the Floor Maximum
settings in the Adjust Menu.
Outdoor Sensor
An outdoor sensor can be connected to the thermostat. The
temperature measured by an outdoor sensor is displayed on
the thermostat. The thermostat communicates the outdoor
temperature to all other devices on the tN4 network.
•
• Locate the Outdoor sensor under the Sensor item in the
Adjust menu.
Mode of Operation Section B
You can operate the thermostat in either the heating or off
modes by manually setting the Mode item to Heat or Off.
The Mode item is found in the Adjust menu. When Mode
is set to Off, the thermostat does not operate except to
provide freeze protection.
•
• Locate the Mode item in the Adjust menu.
Mode of Operation

© 2007 D541 - 08/07 12 of 24
Adjusting the Room Set Temperature (No Schedule) Section C1
If no schedule is being used, the heating temperature can be permanently adjusted from the View menu when viewing
either the “Room” or “Room Set” items.
Adjusting the Room Set Temperature (Schedule) Section C2
When using a schedule, the heating temperature for each
schedule event can be permanently changed from the Adjust
menu. There will be one “Set Heat” item in the Adjust menu
for each scheduled event.
In a two event schedule, the events are:
Occ (Occupied)• UnOcc (UnOccupied)•
In a four event schedule, the events are:
Wake
UnOcc
•
•
Occ
Sleep
•
•
When scenes are used, an additional ‘Away’ event is
available.
If a schedule is not in use, only the Set Heat Occ setting
is available.
Wait 10
seconds
Current schedule
status indicates a
schedule is in use
Press Up or Down
Button to adjust the
“Wake” temperature.
Press Up or Down
Button to adjust the
“UnOcc” temperature
Press Up or Down
Button to adjust the
heating temperature.
OR
Temporary Room Set Adjustment (Schedule Only) Section C3
Pressing the up or down button while viewing the Room
or Room Set temperature during scheduled operation
allows for a temporary change in temperature. When the
temporary change is in effect, the words “TMPY HOLD”
are shown on screen.
The temporary change lasts for 3 hours but can be
cancelled before this by pressing the Up and the Down
buttons at the same time.
Wait 10
seconds
OR
Press Up and Down
buttons at the same
time to cancel the
temporary hold.

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Cycles Per Hour Section D
You can set the number cycles per hour (CPH) for the
heating operation. The default setting for heating cycles
per hour is automatic.
Heating CPH:
•
• When the thermostat is connected to a tN4 System
Control, the thermostat uses the CPH setting on the
tN4 System Control for the Heating CPH.
•
• To manually set the cycles per hour when the thermostat
is not connected to a tN4 System Control, go to the
Adjust menu and select the Heat CPH item.
•
• When the thermostat is connected to a tN4 system with
only thermostats, the SYNC setting synchronizes the
operation of all the thermostats to 5 CPH.
Heating Terminal Units Section E
This thermostat supports Outdoor Reset characterized
heating curves when used in hydronic heating systems. By
setting the correct terminal unit setting, the thermostat can
improve the operation of the heating system. Each stage
of heat has its own terminal unit setting.
Control (CTRL)
Selecting Control as the terminal unit setting on the thermostat
causes the thermostat to adopt the tN4 System Control’s
terminal unit setting.
Hydronic Radiant Floor 1 (HRF1)
Terminal type for a heavy, or high mass, hydronic radiant floor
system. This type of a hydronic radiant floor is embedded in
either a thick concrete or gypsum pour. This heating system
has a large thermal mass and is slow acting.
Hydronic Radiant Floor 2 (HRF2)
Terminal type for a light, or low mass, hydronic radiant
floor system. Most commonly, this type of radiant heating
system is either attached to the bottom of a wood sub floor,
suspended in the joist space, or sandwiched between the
subfloor and the surface. This type of radiant system has
a relatively low thermal mass and responds faster than a
high mass system.
Fancoil (COIL)
A fancoil terminal unit or air handling unit (AHU) consists
of an hydronic heating coil and either a fan or blower. Air
is forced across the coil at a constant velocity by the fan or
blower and is then delivered into the building space.
Fin–tube Convector (CONV)
A convector terminal unit is made up of a heating element
with fins on it. This type of terminal unit relies on the natural
convection of air across the heating element to deliver
heated air into the space. The amount of natural convection
is dependant on the supply water temperature to the heating
element and the room air temperature.
Radiator (RAD)
A radiator terminal unit has a large heated surface that is
exposed to the room. A radiator provides heat to the room
through radiant heat transfer and natural convection.
Baseboard (BASE)
A baseboard terminal unit is similar to a radiator, but has
a low profile and is installed at the base of the wall. The
proportion of heat transferred by radiation from a baseboard
is greater than that from a fin-tube convector.
Other (OTHR)
In applications where a non-hydronic heating system
(furnace, electric baseboard, etc.) is installed, set the
terminal unit to other.

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Heating Operation Section F
One-Stage PWM Heating
Warmer
Set
Heat
Cycle Length
Heat
Reset Water
Temperature
100%
On Time 85% On Time 90% On Time
Indoor Temperature Feedback
Indoor feedback applies when the thermostat is connected to
a tN4 network with a tN4 System Control. Indoor temperature
feedback fine tunes the water temperature of the system
based on the requirements of the thermostats.
Each thermostat tells the tN4 System Control the water
temperature that it requires to heat its zone.
•
• If the zone is becoming too cool, the thermostat asks
for a higher water temperature.
•
• If the zone is becoming too warm, the thermostat asks
for a cooler water temperature.
The tN4 System Control provides the highest water
temperature required by all of the thermostats.
•
• The thermostat with the highest water temperature
requirement stays on 100% of its cycle.
•
• The remaining thermostats stay on for a percentage of
their cycles.
One Stage Heating
Room Sensor Only
When operating with only an room sensor, the on time for
the Heat relay is calculated to satisfy the requirements of
the room sensor.
Floor Sensor Only
When operation with only a floor sensor, the on time for
the Heat relay is calculated to satisfy the requirements of
the floor sensor. The floor temperature varies between the
floor minimum and the floor maximum settings.
Note: Operation with only a floor sensor can lead to either
overheating or underheating of the space.
Room and Floor Sensor
When operating with both a room and floor sensor, the
thermostat calculates an on time for the Heat relay to
satisfy the floor sensor and an on time to satisfy the room
sensor. The Heat relay operates for the longer of these
two on times.
Zone Group
Heat 1 Pump = OFF
Zone Manager: Zone Group DIP = On
Operated by
Zone Manager
Operated by
tN4 System Control
Heat 1 Pump = On
Zone Manager: Zone Group DIP = OFF
Zone Group
System Pump Operation
When a tN4 System Control is used, each tN4 bus has a
system pump.
•
• If the tN4 bus’s system pump must turn on when the
Heat relay is on, set the H1 Pump setting in the Adjust
menu to On.
Thermal Motor Zone Valves
When using a thermal motor zone valve, system pump
operation must be delayed to allow the thermal motor zone
valve to fully open.
•
• When thermal motor zone valves are used set the Heat 1
Delay setting to On.
During light heating loads, overheating can occur due to
the minimum floor temperature setting.
During heavy heating loads, the maximum floor temperature
setting limits the on time of the Heat relay. In this situation,
underheating can occur.

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Cool Groups Section G
Cool Group 1 Cool Group 2
MasterMaster MemberMemberMember
tN4
The thermostat can operate with other thermostats on a
tN4 network in a cool group. When operating as a cool
group, the air temperature readings of all the thermostats
in the group are averaged. A single thermostat controls the
operation of the cooling equipment and is called the cool
group master. This operation is based on the averaged
temperature of all the thermostats in the cool group.
In a cool group, one thermostat is assigned as the cool
group master. The cool group master operates the cooling
equipment for the group. The other thermostats are assigned
as members of the cool group. Cool groups are assigned
using a number 1 through 16 and there can be up to a
maximum of 16 cool groups on the entire tN4 network.
Each cool group can have up to 24 members.
•
• To assign a thermostat as the cool group master of
group 1, go to the Adjust menu. Select Cool Master and
set to 01.
•
• To assign a thermostat as a cool group member of
group 1, go to the Adjust menu. Select Cool Member
item and set to 01.
•
• Repeat the same steps to set up additional cooling
groups.
Setting the Schedule Section H
Master
Schedule 1
Members of
Schedule 1 Members of Schedule 2
Master
Schedule 2
None Zone
Schedule
Zone 1 2 3 4 5 6 7 8
Master Schedule
If the thermostat is connected to other thermostats, then the
thermostat can follow a master schedule. You can set up
a maximum of four master schedules on the tN4 network.
A master schedule is available to all devices on the tN4
network. Master schedules simplify installation since one
master schedule may be used by multiple devices.
To follow a master schedule
1. Assign the thermostat to follow a master schedule, by
setting the Heat Schedule menu item in the Schedule
menu to Member (MBR) 1 to 4.
Optimum Start/Stop Section I
Occ
70°F (21°C)
UnOcc
65°F (18°C)
Room
Temp.
Delay Period
Without Optimum Start/Stop
Optimum Start/Stop
Recovery Period
10P.M. 11P.M. 8A.M. 11A.M.
9P.M. 10P.M. 5A.M. 8A.M.
Occ
70°F (21°C)
UnOcc
65°F (18°C)
Room
Temp.
Delay Period Recovery Period
Optimum
Stop
Optimum
Stop
Setback
Period
Optimum
Start
Setback
Period
When using a schedule, there is a time lag as one event
transitions to another. The four possible transitions are:
•
• Wake to Unoccupied
•
• Unoccupied to Occupied
•
• Occupied to Sleep
•
• Sleep to Wake
When an outdoor temperature measurement is available,
the Optimum Start/Stop feature predicts how long the
temperature transition takes. This allows the thermostat to
operate the heating or cooling system before the scheduled
event in order to have the room at the desired temperature
at the scheduled event time.
When an outdoor temperature measurement is not
available, then the Optimum Start/Stop feature operates
slightly differently. First, the thermostat predicts how long
the transition takes when changing from a low temperature
to a high temperature. It does not track transitions where
the temperature setting drops from a high temperature to
a low temperature.
•
• Locate the Optimum Start/Stop setting in the Adjust
menu.

© 2007 D541 - 08/07 16 of 24
Scenes Section J
Scenes are a function that is available on the thermostat.
•
• To use the scene function, go to the Scene menu and
set the Scene setting to On.
Scenes are a method of changing the temperature throughout
an entire building from a single thermostat. A permanent
scene remains in place until another scene is selected.
When a temporary scene is selected (Scenes 6, 7, 8), a
timer counts down and when it times out, devices return
to the last permanent scene selected.
See the Scene table for details regarding the timing of
Scenes. There are a total of eight Scenes available.
•
• Default Scene: The default scene is Permanent 1. In a
typical installation, the thermostat will be set to follow
the scheduled event in the Permanent 1 scene.
•
• Factory Set Scenes: Scenes 2, 3 and 6 are factory set
and force the thermostat to the Away, Unoccupied or
the Occupied temperature respectively.
•
• Customized Scenes: You can customize Scenes 1, 4,
5, 7, and 8 to either follow the scheduled event, or the
temperature can be forced to the Wake, Unoccupied,
Occupied, Sleep, or the Away temperature.
Note: If no schedule is available, the Scene menu selections
are limited to Occupied and Away
Scene Description Thermostat Operation
1 Permanent 1 Scheduled event, Wake, Unoccupied, Occupied, Sleep, Away
2 Permanent Away 2 Away
DHW demands are ignored (applies to outdoor reset modules)
Setpoint demands operate (applies to outdoor reset modules)
3 Permanent Unoccupied 3 Unoccupied
4 Permanent 4 Scheduled event, Wake, Unoccupied, Occupied, Sleep, Away
5 Permanent 5 Scheduled event, Wake, Unoccupied, Occupied, Sleep, Away
6 Temporary Occupied 6 Occupied for 3 hours
7 Temporary 7 Scheduled event, Wake, Unoccupied, Occupied, Sleep, Away for 4 hours
8 Temporary 8 Scheduled event, Wake, Unoccupied, Occupied, Sleep, Away for 8 hours
Upstairs
Scheduled Event
Downstairs
Scheduled Event
Upstairs
UnOccupied
Downstairs
Scheduled Event
for
4hr
Scene 1 Scene 7
70°F
70°F
62°F
70°F
Master Bedroom
Scheduled Event
Guest Bedroom
UnOccupied
Master Bedroom
Scheduled Event
Guest Bedroom
Scheduled Event
Scene 1
70°F
62°F
70°F
70°F
Scene 4
Example 1:
A house is normally in scene Permanent 1. There is a
master bedroom that operates on a schedule and there is
a guest bedroom that is normally set to Unoccupied. When
a guest arrives, the scene changes to Permanent 4. Scene
4 has been pre-programmed to change the guest room to
operate on the schedule.
Master bedroom thermostat:
Scene Permanent 1 is set to Schedule.
Scene Permanent 4 is set to Schedule.
Guest bedroom thermostat:
Scene Permanent 1 is set to Unoccupied.
Scene Permanent 4 is set to Schedule.
Example 2:
A house is normally in scene Permanent 1. There are
bedrooms upstairs and the entertainment area is downstairs.
The occupants are entertaining guests for an evening and
scene Temporary 7 is selected. This causes the upstairs
thermostats to operate at the Unoccupied temperature and
the downstairs to operate and the Occupied temperature
for four hours.
Upstairs thermostats:
Scene Permanent 1 is set to Schedule.
Scene Temporary 7 is set to Unoccupied.
Downstairs thermostats:
Scene Permanent 1 is set to Schedule.
Scene Temporary 7 is set to Occupied.

17 of 24 © 2007 D541 - 08/07
Away Hold Section K
To set the temperature while the occupants are away, use the
Permanent Away 2 scene. This scene changes all thermostats
on the network to the Away temperature setting. If there is
an Outdoor Reset Module on the tN4 communication bus,
the boiler no longer responds to domestic hot water calls
for heat. Setpoint demands continue to operate as in the
Occupied mode.
Away Temperatures
By default, the Set Heat Away temperature is set to 62°F
(16.5°C).
•
• To set the Away temperature, go to the Adjust menu and
select the Set Heat Away item. The Access Level must
be set to Installer or Advanced.
Offset Section L
This thermostat uses a high quality temperature thermistor
and is calibrated to accurately read the room temperature.
However, if you wish to fine tune the measured room
temperature, use the Offset feature to increase or decrease
room temperature in tenths of degrees.
•
• Locate the Offset setting in the Misc menu.
Units of Temperature Section M
The thermostat can display temperatures in either
Fahrenheit (°F) or in Celsius (°C).
•
• Locate the units setting in the Misc menu.
Backlight Section N
Use the thermostat’s backlight to increase the visibility of
the display. You can set the backlight to On, Temporary,
or Off. If you select On, the backlight remains permanently
on. If you select Temporary, the backlight comes on for 30
seconds when a button is pressed. If you select Off the
backlight remains permanently off. By default, the backlight
is set to Temporary.
• Locate the Backlite setting in the Misc menu.
tN4 Address Section O
When connected to other tN4 devices through a tN4 bus,
the thermostat is automatically assigned a network address.
The tN4 address is useful when trying to correct bus error
open and short circuits.
The address includes the bus water temperature designation
and a device number. The bus water temperature designations
available are Boiler, Mix 1, Mix 2, etc. The device number
can range from 1 to 24. If the thermostat is operating as a
member of a thermostat-only network, the thermostat does
not have an address and the address item in the MISC
menu is not available.
The device number determines the heating priority for each
zone. A thermostat with device number 1 has a higher priority
than device number 24. The tN4 address allows the tN4
system control to shut off low priority zonezs when the heat
source is unable to heat all zones simultaneously. In some
cases, the installer may want to change the thermostat’s
address in order to change the thermostat’s priority relative
to other thermostats.
Note: Keep track of manually set tN4 addresses. When
a tN4 address is manually set, tN4 thermostats using the
Auto Address setting will automatically be assigned new
addresses.
If two thermostats are manually set to the same address, an
error message will appear. The error remains until one of
the addresses is manually changed to a vacant address.
Pump Exercising Section P
When connected to a tN4 system control, the thermostat
exercises the pump relays for 10 seconds every 3 days.
Exercising helps prevent pump seizure. While the thermostat
is exercising, the display shows “Test”.
Exercising does not occur when:
•
• Mode of Operation is set to Off.
•
• Heat Source is set to Other.
•
• DIP switch 2 is set to None.

© 2007 D541 - 08/07 18 of 24
Error Messages
Local Errors and Device Errors
Error messages are used to indicate a problem somewhere in the system. There are two types of error messages: Local
Errors and Device Errors.
A Local Error indicates an error specific to a device. For example, a thermostat with a sensor short circuit will show a Sensor
Short Error on its display. No other devices will show this specific error (unless they also have a sensor short circuit).
A Device Error is used to indicate that there is a local error somewhere else on the system. For example, if a thermostat
has a sensor short circuit, that thermostat will show a Local Error indicating specifically what the problem is. All other
devices on the network will show Device Errors, indicating the address of the device with the Local Error. In other words,
Device Errors are nothing more than pointers, showing you that there is a local error somewhere on the system and where
to find it.
Error Priority
Only one error can be shown on a particular device at a time. If there is more than one error on the system, the highest
priority error will be the one that is shown. The table on pages 19 and 20 lists error messages in order of high priority to
low priority.
How to Locate an Error Message
If the warning symbol (flashing circle with exclamation mark) is visible on screen, this indicates that there is an error
somewhere on the system. To view the error message, you must first put the control into the Advanced or Installer access
level (available in MISC menu). When an error message is present, it is available as an item in the VIEW menu.
Device is attempting to
show floor temperature
but cannot because of
sensor problem.
Keep pressing the Item
button to find the actual
error message
Once error is corrected,
the temperature can be
displayed
If the error message is a Device Error (if “DEV” or “DEV ERR” is shown on screen), read the address shown and go to the
device with that address. That device will have a Local Error indicating specifically what the problem is. When the problem
is corrected, the error message will automatically clear.
Access Levels
In some cases, it is not desirable to let day-to-day users view error messages. In these cases, by lowering the access level
of the thermostat or setpoint device to ‘User’ or lower, error messages cannot be seen in the View menu and the warning
symbol only appears if there is a local error or a device error caused by a critical error on another device. If there is an error
message on the system that you cannot find on a particular thermostat, make sure that the access level on that thermostat
is set to Installer or Advanced.
Sensor Temperature Errors
If a control is unable to display a temperature due to a sensor malfunction or communication problem, the word “Err” is
displayed in place of the temperature. This usually indicates that there is an error somewhere on the system but is not the
actual error message. Keep looking through the View menu to find the actual error message.
While in the View Menu, press the item button until the error message is displayed. You may have to advance through
several View Menu items before the message is displayed.

19 of 24 © 2007 D541 - 08/07
Error Messages (1 of 2)
Error Message Description
ADJUST ERROR
The thermostat failed to read the Adjust menu settings from memory and has reloaded
the factory default settings. Operation stops until you check the Adjust menu settings. The
thermostat provides freeze protection only until you check the Adjust menu items.
Note: To clear the error, the access level must be set to Advanced before checking the
settings in the Adjust menu.
SCENE ERROR
The thermostat failed to read the Scene menu settings from memory and has reloaded the
factory default settings. The thermostat continues to operate while displaying this error.
Note: To clear the error, the access level must be set to Advanced before checking the
settings in the Scene menu.
SCHEDULE ERROR
The thermostat failed to read the Schedule menu settings from memory and has reloaded the
factory default settings. The thermostat continues to operate while displaying this error.
Note: To clear the error, the access level must be set to Advanced before checking the
settings in the Schedule menu.
MISCELLANEOUS ERROR
The thermostat failed to read the Miscellaneous menu settings from memory and has reloaded
the factory default settings. The thermostat continues to operate while displaying this error.
Note: To clear the error, the access level must be set to Advanced before checking the settings
in the Miscellaneous menu.
tN4 BUS ERROR
Due to a short or open circuit, communication is lost with the tN4 bus. Check wires for damage.
Check ‘C’ and ‘R’ wires for polarity. All devices on the tN4 bus will display this error if there is a
short circuit. If the error is only on this device, check for an open circuit between the thermostat
and Zone Manager. Once the error is corrected press any button to clear the error.
NO tN4 SYSTEM CONTROL
The tN4 System Control DIP switch is set to tN4 System Control and the thermostat does
not detect the tN4 System Control. Once the tN4 System Control is detected, this error will
clear automatically.
Note: If a tN4 System Control is not installed, set the tN4 System Control DIP switch to
None.
ADDRESS ERROR
Two thermostats have been manually set to the same address. The thermostat continues to
operate with this error but does not communicate with the tN4 bus. To clear this error select
an unused address. This can be done automatically by setting the Address item to Auto.
DEVICE LIMIT
You have installed more than 24 devices on the tN4 bus. You must remove the additional
devices and move them to a different bus if possible.
DIP SWITCH 2 MODE
The tN4 System Control DIP switch is set to None and the thermostat has detected a tN4
System Control. The thermostat does not operate until this error is corrected. The tN4 System
Control DIP switch must be set to tN4 System Control.

© 2007 D541 - 08/07 20 of 24
Error Messages (2 of 2)
Error Message Description
ROOM SENSOR SHORT CIRCUIT
Due to a short circuit, the thermostat failed to read the built-in sensor. If the Auxiliary Sensor is
set to ROOM, or the thermostat is connected to a tN4 System Control, the thermostat continues
to operate. Otherwise, the thermostat stops operation. To clear the error, press either the
Menu or Item button. If the error does not clear, contact your tekmar sales representative.
ROOM SENSOR OPEN CIRCUIT
Due to an open circuit, the thermostat failed to read the built-in sensor. If the Auxiliary Sensor is
set to ROOM, or the thermostat is connected to a tN4 System Control, the thermostat continues
to operate. Otherwise, the thermostat stops operation. To clear the error, press either the
Menu or Item button. If the error does not clear, contact your tekmar sales representative.
AUXILIARY SENSOR SHORT CIRCUIT
Due to a short circuit, the thermostat failed to read the Auxiliary Sensor. The thermostat
displays the error and continues to operate unless:
No other Room sensors are available and the thermostat is not connected to a tN4 System
control. Then the thermostat stops operation.
No other Floor sensors are available and the Floor Maximum is not set to Off, then the H1
contact no longer operates.
Locate and repair the problem as described in the Data Brochure D070. Once the error is
corrected, press any button to clear the error.
AUXILIARY SENSOR OPEN CIRCUIT
Due to an open circuit, the thermostat failed to read the Auxiliary Sensor. The thermostat
displays the error and continues to operate unless:
No other Room sensors are available and the thermostat is not connected to a tN4 System
control. Then the thermostat stops operation.
No other Floor sensors are available and the Floor Maximum is not set to Off, then the H1
contact no longer operates.
Locate and repair the problem as described in the Data Brochure D070. Once the error is
corrected, press any button to clear the error.
SENSOR ERROR
All of the sensors have been set to Off or None including the built-in sensor and the tN4
System Control DIP switch is set to None. The thermostat stops operation.
Turn on at least one sensor or connect the thermostat to a tN4 system control and set the
tN4 System Control DIP switch to tN4 System Control.
COOL GROUP MEMBER ERROR
The thermostat can no longer detect its cool group master. Check the communication
connections for open or short circuits. Once the cool group master has been detected, the
error message clears.
SCHEDULE MEMBER ERROR
The thermostat can no longer detect its schedule master. Check the communication connections
for open or short circuits. Once the schedule master has been detected, the error message
clears.
DEVICE ERROR AT ADDRESS #:##
#:## is the address of the device with the error. The bus number displays before the colon,
and the device number displays after. Go to the device with the address displayed.
Possible Addresses:
01 to 24 - Device Error on Thermostat only network
b:01 to b:24- Device Error on Boiler Bus
1:01 to 1:24 - Device Error on Bus 1
2:01 to 2:24 - Device Error on Bus 2
3:01 to 3:24 - Device Error on Bus 3
CTRL - Device Error on System Control
MIX1 - Device Error on Mixing Expansion Module (See System Control for local error)
MIX2 - Device Error on Mixing Expansion Module (See System Control for local error)
MIX3 - Device Error on Mixing Expansion Module (See System Control for local error)