Tekmar 557 Thermostat Installation & Operation Manual


Tekmar 557 Thermostat



The tekmarNet® Thermostat 557 is a communicating touchscreen thermostat designed to operate either: a hydronic radiant floor with a two stage heat pump (water-to-air or air-to-air) for heating & cooling and an emergency backup heating system; or two stages of heating and two stages of cooling. There are three auxiliary sensor inputs that can be used to measure room, floor, outdoor or duct temperature. The optional floor sensor allows precise heating of radiant floors. Relative humidity level can be measured and controlled using either the built-in or external humidity sensor. The large touchscreen display allows you to easily adjust 7-day programmable schedules and room temperatures to optimize comfort and energy savings. The 557 can connect to tekmarNet® controls using two or four wires or it can operate as a stand-alone device.

Energy Saving Features

  • Programmable Schedule
  • Zone Synchronization
  • Zone Post Purge
    Warm Weather Shut Down
  • Cooling Interlock
  • Auto Heating Cycle
  • Temporary Hold
  • Away Scene Key

Additional Features

  • 3 Auxiliary Sensor Inputs
  • Air Group Master
  • Backlight
  • Daylight Savings Time
  • Exercising
  • Freeze Protection
  • Heat / Cool Priority
  • Network Schedule Master or
  • Member
  • Optimum Start
  • Outdoor & Floor Temperature
  • Display
  • Radiant Floor Heating & Cooling
  • Relative Humidity Control
  • Room Temperature Limiting
  • Scenes
  • Touchscreen Technology
    tekmarNet® Communication Compatible

Important Safety Information

It is your responsibility to ensure that this thermostat is safely installed according to all applicable codes and standards. tekmar is not responsible for damages resulting from improper installation and/or maintenance.
Tekmar 554 Thermostat-fig.1This is a safety alert symbol. The safety alert symbol is shown alone or used with a signal word (DANGER, WARNING, or CAUTION), a pictorial and/or a safety message to identify hazards. When you see this symbol alone or with a signal word on your equipment or in this manual, be alert to the potential for death or serious personal injury.
Tekmar 554 Thermostat-fig.2This pictorial alerts you to electricity, electrocution, and shock hazards.
This symbol identifies hazards which, if not avoided, could result in death or serious injury.
This symbol identifies hazards which, if not avoided, could result in minor or moderate injury.
This symbol identifies practices, actions, or failure to act which could result in property damage or damage to the equipment.
Read the manual and all product labels BEFORE using the equipment. Do not use it unless you know the safe and proper operation of this equipment. Keep this manual available for easy access by all users. Replacement manuals are available at tekmarControls.com


  • It is the installer’s responsibility to ensure that this thermostat is safely installed according to all applicable codes and standards.
  • Improper installation and operation of this thermostat could result in damage to the equipment and possibly even personal injury or death.
  • This thermostat 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.

Do not attempt to service the thermostat. There are no user-serviceable parts inside the thermostat. Attempting to service the thermostat voids the warranty.

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.



Tools Required

  • tekmar or jeweler screwdriver
  • Phillips head screwdriver
  • Wire stripper

Materials Required 

  • 18 AWG LVT Solid Wire (low-voltage connections

Installation Location

Choose the placement of the thermostats early in the construction process to enable proper wiring during rough-in.


  • Install the thermostat on an interior wall.
  • Keep the thermostat dry. Avoid potential leakage onto the control.
  • Maintain relative humidity less than 90% in a non-condensing environment.
  • Avoid exposure to extreme temperatures beyond 32-122°F (0-50°C).
  • Avoid drafts, direct sun, and anything else that could cause inaccurate temperature readings.
  • Install away from the equipment, appliances, or other sources of electrical interference.
  • Install to allow easy access for wiring, viewing, and adjusting the display screen.
  • Install approximately 5 feet (1.5 m) off the finished floor.
  • The maximum length of the wire is 500 feet (150 m).
  • Strip the wire to 3/8″ (10 mm) for all terminal connections.
  • Use standard 8 conductors, 18 AWG wire.

To prevent the risk of personal injury and/or death, make sure power is not applied to the thermostat until it is fully installed and ready for final testing. All work must be done with power to the circuit being worked on turned off.
Please be aware local codes may require this thermostat to be installed or connected by an electrician.

Removing the Thermostat Base


To remove the thermostat base:

  • Locate the tab on the bottom of the thermostat.
  • Push the tab with either your thumb or with a screwdriver.
  • Lift the thermostat front away from the thermostat’s base.

Mounting the Thermostat Base

If a single gang box is used:


  • Feed the wiring through the large hole of the thermostat base.
  • Fasten the base of the thermostat to the gang box.
  • Terminate wiring to the wiring strip.
  • Push the thermostat front onto the thermostat base.


Do not over-tighten wiring screws. Hand-tighten only.

If a gang box is not used:


  • Feed the wiring through the large hole in the thermostat base.
  • Mount the thermostat base directly to the wall.
  • 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.
  • Terminate wiring to the wiring strip.
  • Push the thermostat front onto the thermostat base.

Thermostat Wiring

The thermostat can be wired in three different ways.

  • Stand Alone ― Similar to tekmarNet®4 wiring with tN4 wiring terminal not used. First stage heating relay (Rh – W) can be wired directly to switching relays.
  • tekmarNet®4 ― Allows the thermostat to be wired using 4 wires to a tN4 Wiring Center or Zone Manager point-to-point. Alternatively, the thermostat can operate the heating and cooling equipment locally and the tN4 communication bus can be daisy-chained from one thermostat to another.
  • tekmarNet®2 ― Allows the thermostat to be wired point-to-point using 2 wires to a tN2 Wiring Center, House Control, or Zone Manager. This makes wiring easy for retrofit applications.
    Application-specific wiring diagrams are provided in the 554_A brochure.

Compatible Sensors

The thermostat is compatible with Indoor Sensor 076, 077, and 084, Slab Sensor 072, 073, and 079, Outdoor Sensor 070, Universal Sensor 082 and Duct Sensor 083.
Only qualified personnel should perform testing procedures. A licensed electrician is recommended.

Testing the Thermostat Wiring

Testing tekmarNet®2 Wiring 
Testing the Power
If the thermostat display turns on, this indicates that the thermostat is operating correctly and there are no electrical issues. In the event that the display is off, or the display is cycling on and off:

  1. Remove the thermostat wiring cover.
  2. Check to ensure that the tN2 wires on the thermostat are connected to a zone on a House Control, Wiring Center, or Zone Manager.
  3. Use an electrical meter to measure DC voltage between the tN2 terminals.
    • If the DC voltage is 0 V (dc) for at least 20 seconds, then there is an open or short circuit in the tN2 wires.
    • If the DC voltage is 0 V (dc) for 10 seconds and then is 23 to 24 V (dc) for 5 seconds, this indicates the wiring is correct.
  4. If the thermostat display is off or is cycling on and off, move the thermostat to the next available zone on the House Control, Wiring Center, or Zone Manager.
    • If the thermostat display remains permanently on, there may be a fault with the previously tried zone on the House Control, Wiring Center, or Zone Manager.
    • If the thermostat display continues to be off, or is cycling on and off, there may be a fault on the thermostat.
      If a fault is suspected, contact your tekmar sales representative for assistance.

Testing tekmarNet®4 and Stand Alone 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.

Testing the Relay Outputs
The thermostat includes a User Test to check if the thermostat’s relays are operating and that the thermostat is wired correctly to the HVAC equipment. The User Test setting can be located in the Toolbox menu. Either Heat or Cool test can be selected. Cancel button – Exits the user test and returns the Toolbox menu. Hold button – Pauses the user test step for up to 5 minutes. Next Item button – Advances the user test to the next test step.

User Test Sequence
Heat Test Cool Test
Step Relay(s) Closed Step Relay(s) Closed
O Relay OFF Rc-O/B is opened O Relay ON Rc-O/B
B Relay ON Rc-O/B B Relay OFF Rc-O/B is opened
Fan Rc-G Fan Rc-G
Y1 Heat Rc-Y1 and Rc-G Y1 Cool Rc-Y1 and Rc-G
Y2 Heat Rc-Y1 and Rc-Y2 and Rc-G Y2 Cool Rc-Y1 and Rc-Y2 and Rc-G
W2 Heat Rh2-W2 W2 Cool Rh2-W2
W1 Heat Rh1-W1 Humidify* ACC-ACC
Humidify* ACC-ACC Dehumidify* ACC-ACC or Rc-Y2
Dehumidify* ACC-ACC or Rc-Y2 HRV* Rc-Y2
HRV* Rc-Y2 Valve* ACC-ACC or Rc-Y2
Valve* ACC-ACC or Rc-Y2
*availability of test step and additional relay closures based upon Setup menu settings.

Switch Settings


Switch Position Action








The thermostat is locally locked and the access level cannot be changed. Set to Lock when installation has been completed.


The thermostat is unlocked and the access level may be changed. Go to the Toolbox menu to change the access level. Set to Unlock during the installation process.

tekmarNet® system controls include a Global Lock that locks all connected thermostats. Set the tekmarNet® system control to unlock to allow access level adjustment on all connected thermostats.



ON Not used
OFF Not used

User Interface

Home Screen

The touchscreen of the 557 provides one touch access to these settings

Tekmar 554 Thermostat-fig.8 Tekmar 554 Thermostat-fig.9

Programmable Settings

Programming Menus

Press and hold the Home button for 3 seconds to enter the programming menus. The thermostat returns to the last programming menu previously used.

Tekmar 554 Thermostat-fig.10

Select a Programming Menu

  • Touch “NEXT” to advance (clockwise in the above illustration) to the next menu.
  • Touch “BACK” to go backward (counterclockwise in above illustration) through the menus.
  • Touch “ENTER” to enter a menu.

Setting Items

  • TouchTekmar 554 Thermostat-fig.11 arrow to adjust the setting if required.
  • Touch “NEXT ITEM” to advance to the next item within the menu.
    Touch “BACK ITEM” to go back to the previous item within the menu.
  • To return to the parent menu after changing a setting, press and release the Home button.
  • To return to the Home screen, press and release the Home button twice or wait 30 seconds to automatically return to the Home screen.

Tekmar 554 Thermostat-fig.12 Tekmar 554 Thermostat-fig.13 Tekmar 554 Thermostat-fig.14 Tekmar 554 Thermostat-fig.15 Tekmar 554 Thermostat-fig.16 Tekmar 554 Thermostat-fig.17 Tekmar 554 Thermostat-fig.18 Tekmar 554 Thermostat-fig.19 Tekmar 554 Thermostat-fig.20 Tekmar 554 Thermostat-fig.21

Tekmar-557-Thermostat-fig.22 Tekmar-557-Thermostat-fig.23 Tekmar-557-Thermostat-fig.24 Tekmar-557-Thermostat-fig.25 Tekmar-557-Thermostat-fig.26 Tekmar-557-Thermostat-fig.27 Tekmar-557-Thermostat-fig.28 Tekmar-557-Thermostat-fig.29 Tekmar-557-Thermostat-fig.30 Tekmar-557-Thermostat-fig.31 Tekmar-557-Thermostat-fig.32 Tekmar-557-Thermostat-fig.33 Tekmar-557-Thermostat-fig.34 Tekmar-557-Thermostat-fig.35

Sequence of Operation

Heating Operation

  • Set Heat Temperature 
    When using only a room temperature sensor, the thermostat operates the heating system to maintain the Set Heat Room temperature. The “Heat On” symbol is shown on the display when the thermostat is heating.
  • Air Temperature Heating
    When using only a room temperature sensor, the thermostat operates the heating system to maintain the Set Heat Room temperature.
  • Floor Heating 
    When using both a room and a floor temperature sensor, the floor is heated at least to the Floor Minimum setting. If the room air temperature requires additional heating, the floor temperature is increased until the air temperature reaches the Set Heat Room setting. At no time is the floor heated above the Floor Maximum setting. This protects the floor covering. A combination of floor and air temperature sensors is recommended for areas with south-facing windows with large solar gains and to protect wood floors from overheating.
    Suggested Floor Maximum settings are 90°F (32°C) for tile, stone, or concrete floors and 85°F (29°C) for wood floors.
  • Radiant Floor Baseload
    When the terminal unit is a Hydronic Radiant Floor (HRF1 or HRF2) and no floor temperature sensor is installed, the thermostat can optionally provide baseload heating. This allows the radiant floor to be heated even though the room air temperature is satisfied. This is useful in areas where a radiant floor heating zone is overlapped by an air heating system. The radiant floor heating is overwhelmed by the quick heat-up rate of the air heating system, resulting in a radiant floor heating zone that rarely turns on. The radiant baseload option allows the radiant floor to counteract the air heating system by heating the floor at a reduced output even when the room air temperature is satisfied. This is also useful in areas that experience large solar gains through windows. The radiant baseload is automatically shut off in the summer by the Warm Weather Shut Down feature.
  • Warm Weather Shut Down
    When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD) setting on the tekmarNet® main control, the heating system is shut off.
  • Balance Point
    An air source heat pump’s Coefficient Of Performance (COP) decreases with colder outdoor temperatures. This affects the heating output capacity of the heat pump to heat the building. When the COP is equal to 1, the heat pump no longer provides an economic advantage over electric heating elements or other supplemental heating fuel. The outdoor temperature at which this occurs is known as the balance point. When the outdoor temperature falls below the balance point, the heat pump is shut off and the backup supplemental heat source is operated to heat the building. The 557 has the ability for the balance point setting to change based upon a programmable schedule. This is useful in cases where the electrical utility offers lower different energy pricing throughout the day.

Backup W2 Differential
The backup heat source operated by W2 has an adjustable differential. The differential is relative to the previous heating stage.

  • No radiant floor heating, no heat pump (no W1, no Y1, no Y2)
    The W2 relay’s differential is ±1°F (0.5°C) centered around Set Heat.
  • Radiant floor heating, no heat pump (W1, no Y1, no Y2)
    The W2 relay turns on at Set Heat – Backup Differential.
  • Single Stage Heat Pump (W1, Y1, no Y2)
    The W2 relay turns on at Set Heat – 1°F (0.5°C) – Backup Differential.
    • Two Stage Heat Pump (W1, Y1, Y2)
      The W2 relay turns on at Set Heat – 1°F (0.5°C) – Y2 Differential – Backup Differential.
  • Freeze Protection
    The thermostat operates the heat whenever the room or floor temperature falls below 40°F (4.5°C) even when the mode is set to off.

Cooling Operation

  • Set Cool Temperature 
    The thermostat operates an air conditioner to provide cooling. The “Cool On” symbol is shown on the display when the thermostat is cooling.
  • Floor Cooling 
    Floor cooling is designed to cool a building together with an air cooling system. Floor cooling reduces part of the sensible cooling load, while the air cooling equipment must cool the latent load (dehumidification) and the remaining sensible load. The thermostat has the option to support floor cooling when connected to a heat pump control using tekmarNet® communication. The terminal unit type must be set to be HRF1 or HRF2, the floor cooling setting must be set to On and the heating system must be in Warm Weather Shut Down (WWSD). When the thermostat is set to Mode Cool, the floor cooling turns on 1.0°F (0.5°C) below the Set Cool setpoint. This allows the floor cooling to operate for long periods of time while the air cooling system cycles on and off to maintain the cooling setpoint. Floor cooling does not operate below 64°F (18.0°C).
  • Cooling Cold Weather Shut Down
    When the outdoor air temperature falls below the Cooling Cold Weather Shut Down (CWSD) setting on the thermostat, the cooling system is shut off.Tekmar-557-Thermostat-fig.37

Room Min and Max Limits

Heating and cooling minimum and maximum temperature settings are available in the Set Temp menu. These allow the installer to select start and stop limits for the temperature settings in both heatings and cooling for the User and Limited access levels. This is useful in commercial installations and child/guest bedrooms where the availability of the full temperature setting range may not be desirable.

Hydronic Pump and Valve Operation

  • Exercising
    When connected to a tekmarNet® system 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 exercise, 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® system control with the Flushing feature turned on, the thermostat will display “FLUSHING” for the duration of the flushing operation.
  • Hydronic System Supply Pump
    When connected to a tekmarNet® system control, the thermostat’s W Pump setting affects the operation of the primary pump or mix pump on the system control. When the thermostat is connected to the boiler bus, the boiler system or primary pump is operated. When the thermostat is connected to the mix bus, the mix system pump is operated.
    If the thermostat operates a motorized or thermal motor zone valve, the W Pump setting should be set to On.
    If the thermostat operates a thermal motor (wax actuator) zone valve, set the W Thermal Motor 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 W 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 system 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. Priority is determined by the DHW priority setting on the tekmarNet system control.

Fan Operation

The fan operates together with the air heating or cooling systems. The user can also select to operate the fan manually by pressing the Fan button. This allows the user to choose between Auto and On. “Auto” allows the fan to operate with heating or cooling, but normally the fan is off. “On” forces the fan to operate continuously.

  • Ventilation Fan
    In order to provide ventilation to a building, the fan can operate beyond the time required for the heating and cooling systems. Vent Mode allows the user to set the fan to operate for 10 to 90% of an hour, in 10% (6 minutes per hour) increments, as well as in Auto and On mode. This is available when the Vent Mode setting in the Setup menu is set to On. Once Ventilation is set to On, the Fan minimum run time percentage during theTekmar 554 Thermostat-fig.32 events can be set so that the fan can operate on a schedule and/or together with scenes.
  • Fan Post Purge
    The fan relay includes a post purge feature that operates the fan after the heating or cooling system has shut off. When a duct temperature sensor has been installed the length of post-purge is based on the air duct temperature and the Heat Purge or Cool Purge temperature settings. When there is no duct temperature sensor installed, the length of post purge is based on the Heat Purge and Cool Purge time settings.

Relative Humidity Operation

Relative Humidity (RH) is controlled by maintaining the Minimum Humidity using humidification and by maintaining Maximum Humidity using dehumidification. The RH is maintained within a 5% differential. The differential is applied above the minimum setpoint, and applied below the maximum setpoint. When the mode is set to off, the humidification and dehumidification systems do not operate. To avoid condensation on windows, the minimum relative humidity setting can be changed according to the following outdoor temperatures.

Outdoor Temperature -10°F (-23°C) 0°F (-18°C) 10°F (-12°C) 20°F (-7°C) 30°F (-1°C)
Suggested RH Min 20% 25% 30% 35% 35%

The thermostat has three humidification modes.

Operation Mode Required Relay(s) Sensor Required
Stand Alone Humidifier

Humidifier operates independently of the HVAC system.

Available in all modes except off.



Humidifier with Fan

Humidifier ducted together with HVAC system. The system fan is operated whenever the humidi- fier is operating.

Available in all modes except off.



Humidifier with Air Heating

Humidifier ducted together with HVAC system. The air system must be heating (heat pump, furnace, electric or hydronic fan coil) in order to allow the humidifier to operate.

Available when heating.




The thermostat has up to five dehumidification modes.

Operation Mode Required Relay(s) Sensor Required
Stand Alone Dehumidifier

Dehumidifier operates independently or the HVAC system.

Available in all modes except off.






Coil Dehumidification

A duct temperature sensor is required. A DX or chilled water coil is operated to maintain a dis- charge air temperature of 45°F (7°C). The room air temperature is allowed to fall up to 3°F (1.5°C) below the cooling setpoint while coil dehumidification is operating, at which point dehumidification is shut off. The fan relay (G) is not turned

on, rather the ACC or Y2 relay provides a signal to the air handler unit to operate the fan at low speed.

Available only when cooling.





Duct Sensor 083
HRV Dehumidification

(only available with single-stage heat pumps or air conditioners)

The HRV is operated based on indoor dew point and outdoor air temperature. The HRV operates when the indoor dew point is 5.5°F (3.0°C) above the outdoor temperature. The HRV is shut off when the indoor dew point falls to 2°F (1.0°C) above the outdoor temperature.

Available in all modes except off.

DHM3 Y2 RELAY = HRV Outdoor Sensor 070
Stand Alone + HRV Dehumidification

(only available with single-stage heat pumps or air conditioners)

During cooling mode, a stand-alone dehumidifier is operated in the same manner as DHM1.

During the heating mode, an HRV provides dehumidification in the same manner as DHM3.

Available in all modes except off.





Outdoor Sensor 070
Coil + HRV Dehumidification

(only available with single-stage heat pumps or air conditioners)

During cooling mode, a coil dehumidifier is operated in the same manner as DHM2.

During the heating mode, an HRV provides dehumidification in the same manner as DHM3.

Available in all modes except off.





Duct Sensor 083

and Outdoor Sensor 070

Air Group Operation

To prevent heating and cooling at the same time, this thermostat can operate with other thermostats on a tekmarNet system to form an air group. The 554 can be set up as the air group master. Other heat-only thermostats can be set up as an air group member. When operating as an air group, the air temperature readings of all the air group member thermostats are communicated to the air group master thermostat and an average air temperature is determined. The cooling operates based on the average temperature reading. When the air group master is in cooling operation, the air group member thermostats do not operate the heating system for air heating.

Tekmar 554 Thermostat-fig.30

Time Clock

The thermostat includes a time clock that is automatically visible in the Home menu when a programmable schedule is used. If the schedule is not used, the user has the option to indicate that the time should be shown in the Home menu.
During a loss of power, the thermostat continues to keep the correct time and date for at least 4 hours. If the power is off for more than 4 hours, the user will need to set the time.
The thermostat supports automatic update for daylight savings time. Simply set Daylight Save to On together with the correct day, month, and year and the time is automatically updated each spring and fall.
When a thermostat is connected to a tekmarNet system, adjustment of the time on one thermostat updates all connected thermostats. This option can be disabled by selecting the Local Network Group setting to On.

Temperature Adjustment

Permanent Adjustment ― No Schedule
When no programmable schedule is used, touch the up or down arrows to permanently set the “Set Heat Room” or “Set Cool Room” temperature. This thermostat is capable of controlling both air and floor temperature.

Permanent Adjustment ― With Schedule 
When a programmable schedule is used, there are two room heating temperatures available, one for the Tekmar 554 Thermostat-fig.33time period and another for the Tekmar 554 Thermostat-fig.34time period. When touching the Tekmar 554 Thermostat-fig.11 arrow to change the temperature, only the temperature for the current time period is changed.

  1. To adjust the temperature for both time periods, press and hold the Home button for 3 seconds to enter the programming menus.
  2. Enter the “SET TEMP” menu to adjust the following settings:
    • Set Heat RoomTekmar 554 Thermostat-fig.33 (air heating or air heating with floor sensor)
    • Set Heat RoomTekmar 554 Thermostat-fig.34 (air heating or air heating with floor sensor)
    • Set Heat Room AWAY (air heating or air heating with floor sensor)
    • Floor MinTekmar 554 Thermostat-fig.33 (air heating with floor sensor)
    • Floor Min Tekmar 554 Thermostat-fig.34(air heating with floor sensor)
    • Set Cool RoomTekmar 554 Thermostat-fig.33 (air cooling)
    • Set Cool RoomTekmar 554 Thermostat-fig.34 (air cooling)
    • Set Cool Room AWAY (air cooling)

Temporary Hold 
Temporary hold allows a user to change the temperature for a period of time and then automatically return to the permanent temperature setting. This is especially useful in commercial buildings that are in use for short amounts of time. When Temporary Hold is selected, touching the up or down arrow changes the temperature for either 3, 6, 9 or 12 hours. If the thermostat is using a schedule, ‘Schd’ provides a temporary hold until the next scheduled event time. After the temporary hold time expires, the thermostat returns to normal operation. By default, the temporary hold feature is off.Tekmar 554 Thermostat-fig.31

Programmable Schedules

Energy savings can be achieved by lowering the heating temperature and increasing the cooling temperature, for example, at night,Tekmar 554 Thermostat-fig.32 at other times when the building is unoccupied.
When operating on a programmable schedule  Tekmar 554 Thermostat-fig.32  symbol is shown in the Home menu. The or indicates the current operating temperature.
All schedules are stored in permanent memory and are not affected by a loss of power.

Display Action
Tekmar 554 Thermostat-fig.33 Day temperature
Tekmar 554 Thermostat-fig.34 Night temperature

This thermostat can operate on a programmable schedule in order to automatically lower the room temperature setting. Options include:

  • Turning off the schedule (OFF)
  • Operating on a schedule that applies only to this thermostat zone (ZONE)
  • Operating one of the four systemwide schedules as a master (Schedule Master 1 through 4*)
  • Joining one of the four systemwide schedules as a member (Schedule Member 1 though 4*)
    *Requires the thermostat to be connected to a tekmarNet® system.

Once the type of schedule has been selected, the thermostat can support schedules that have either:

  • 2 events per day
  • 4 events per day
    Schedules with 4 events per day are common for residential use while 2 events per day are common for commercial installations.

The schedules can be repeated every:

  • 24 hours
  • 7 days (week)

A 7-day schedule allows a unique time to be set to change the temperature for each day of the week.
The schedule also includes a “SKIP” option that allows the programmable schedule to skip a temperature change and remain at the previous temperature setting. The “SKIP” setting can be found between 11:50 PM (23:50 hours) and 12:00 AM (0:00 hours).

When a programmable schedule is selected, there is a time delay while the room warms up or cools down fromTekmar 554 Thermostat-fig.34 the temperature toTekmar 554 Thermostat-fig.33 the temperature. The thermostat has the option of using Optimum Start to predict the heat-up or cool down rate of the room. When Optimum Start is set to On, the heating or cooling is started in advance to allow the room to reach the Set Room Tekmar 554 Thermostat-fig.33temperature at the time set in the programmable schedule.

Scenes (System Override)

Scenes provide an easy way to save energy, when building residents are on vacation, for example, or override a programmable schedule when plans change.
Away Key
This thermostat includes an Away Key to set the thermostat to quickly turn down the heating temperatures and increase the cooling temperatures on all thermostats and suspend heating the domestic hot water tank to maximize energy savings. To enable, go the Scene menu and set Away Key to on.

To activate the Away scene, touch “Going Away” on the screen.Tekmar 554 Thermostat-fig.35

  • Select PERM (permanent) or a number of days using the or arrow. The range is 1 to 180 days.
  • Press the home button to accept the setting or leave the screen untouched for several seconds.
  • “Scene Away” is displayed on the home screen until the number of days expires.
  • Touch “Cancel Away” to cancel at any time.
  • The temperature is not adjustable while the thermostat is in Away.Tekmar 554 Thermostat-fig.36

Additional Scenes 
Additional energy-saving scenes are available when a User Switch or Gateway is installed. A complete listing of each scene is shown below.

Scene Number Scenes

= None Operation


= Away Operation


= All Operation


= Guest Operation

1 Permanent  or Schedule Permanent  or Schedule Permanent  or Schedule Permanent
2 Scene 1 Away Away Away
3 Scene 1 Scene 1 Permanent Permanent
4 Scene 1 Scene 1 Configurable Permanent
5 Scene 1 Scene 1 Permanent  or Schedule Permanent  or Schedule
6 Scene 1 Scene 1 Temporary  3 Hours Permanent
7 Scene 1 Scene 1 Temporary  4 Hours Permanent
8 Scene 1 Scene 1 Temporary  8 Hours Permanent

Recommendation on How to Use Scenes 
Deciding how to use scenes depends on the needs and lifestyle of the customer using the building.

  • Multi-Tenant Apartments
    Scenes should be disabled (None) in multi-tenant buildings where each occupant has differing heating requirements.
  • Residential Homes
    Some residential customers may not require scenes. In that case, scenes can be disabled (None). Homeowners who wish to save on energy costs should consider using the Away scene to save energy while they are away from their property (for example, on vacation or on holidays).
    The use of the Guest scene is useful in residential applications where a number of spare bedrooms are occupied infrequently. Each spare bedroom would be set up to operate on the Guest scene. The remaining thermostats can be set up to operate on the None, Away or All scene configuration. Normally, the spare bedrooms would operate at the moon temperature settings. When guests arrive, scene 5 can be activated through a User Switch or Gateway. The spare bedroom then operates at the Tekmar 554 Thermostat-fig.33temperature settings or operates on a programmable schedule if a schedule has been set up. When guests depart, the scene can be changed back to scene 1 and the spare bedrooms resume operation at theTekmar 554 Thermostat-fig.34 temperature settings.
  • Commercial Buildings
    Commercial buildings are typically in use on a predictable schedule and normally can operate in scene 1. In order to accommodate staff working overtime or cleaning staff, a 3-hour or 8-hour temporary override is available when installed in conjunction with a User Switch or Gateway. In these cases, the thermostats should be set up to use the scene configuration. At the touch of a button, the whole building changes from operating on a programmable schedule (typically at Tekmar 554 Thermostat-fig.34the temperature setting when not occupied) to operating at theTekmar 554 Thermostat-fig.33 temperature settings for 3 hours (scene 6) or 8 hours (scene 8). After the timer counts down and expires, the scene changes back to the previous scene.

Secondary Temperature Display

This thermostat can display the outdoor, floor, or room heating and cooling temperature settings in the smaller number area at the top right of the screen. To toggle the item currently displayed, touch the secondary temperature. Display of the floor or outdoor temperature requires a connection to an outdoor or floor temperature sensor, or the thermostat is connected to a tekmarNet® system that includes an outdoor sensor. The reading of the outdoor sensor connected directly to the thermostat takes precedence over any outdoor sensor reading available on the tekmarNet® system.

Tekmar 554 Thermostat-fig.37

Access Levels

The thermostat Toolbox menu supports four access levels: Installer (INST), User (USER), Limited (LTD), and Secure (SEC). The access level can be adjusted when the thermostat is unlocked. There are two locations to lock the thermostat:

  1. Locally on the thermostat using the Lock switch located in the wiring area.
  2. Globally on the tekmarNet® system control using the Lock switch or Access level (if installed)
    Both the local and global lock settings must be set to unlock before the thermostat access level is adjustable.
    The selection of the access level is dependent on the use of the building and the type of occupants.
  • Installer ― Suitable for HVAC installers only. Times out to User access level after 24 hours.
  • User ― Suitable for most residential homeowners.
  • Limited ― Suitable for rental properties or commercial buildings where some level of temperature adjustment is required.
  • Secure ― Suitable for schools, churches, and other public buildings where temperature adjustment is not desired.

tekmarNet® Address

When connected to a tekmarNet® system, each thermostat will be automatically given an address. The address is useful as a troubleshooting tool to locate thermostats with errors and allows room naming on a Gateway.
The address consists of the bus water temperature followed by the thermostat device number. Available buses are b (boiler), 1, 2 and 3. Device numbers range from 01 to 24. If the thermostat is used without a tekmarNet® system control, the bus number is not shown.
When using the thermostat with a Gateway, it is important that each address be changed to be manually set. This allows each thermostat to be named on the Gateway. 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 or to an Auto.
Keeping a documented list of thermostat addresses is highly recommended. This is extremely helpful when troubleshooting errors. The tekmarNet® system control will display the addresses of thermostats that have errors. Refer to the address documentation to simplify the process of locating and correcting error messages.

Cleaning the Thermostat

Entering the Screen Clean menu allows 30 seconds to clean the thermostat and display with a moist cloth. Do not use solvents to clean the thermostat.


Tekmar-557-Thermostat-fig.38 Tekmar-557-Thermostat-fig.39 Tekmar-557-Thermostat-fig.40 Tekmar-557-Thermostat-fig.41 Tekmar-557-Thermostat-fig.42

Limited Warranty and Product Return Procedure

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 COMPLIANCE WITH OR NON-VIOLATION OF ANY APPLICABLE ENVIRONMENTAL, HEALTH OR 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.


Download Manuals: Tekmar 557 Thermostat Installation & Operation Manual

Other  Manual:

Tekmar 557 Thermostat Quick Setup Guide


Tekmar 557 Thermostat Installation & Operation Manual





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