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.
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.
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
WARNING
Do not attempt to service the thermostat. There are no user-serviceable parts inside the thermostat. Attempting to service the thermostat voids the warranty.
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
Materials Required
Installation Location
Choose the placement of the thermostats early in the construction process to enable proper wiring during rough-in.
NOTICE
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.
To remove the thermostat base:
If a single gang box is used:
NOTICE
Do not over-tighten wiring screws. Hand-tighten only.
If a gang box is not used:
The thermostat can be wired in three different ways.
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 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:
Testing tekmarNet®4 and Stand Alone Wiring
Testing the Power
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 | Position | Action |
|
1 | ON | LOCK ACCESS LEVEL The thermostat is locally locked and the access level cannot be changed. Set to Lock when installation has been completed. |
| OFF | UNLOCK ACCESS LEVEL 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. | |
| 2 | ON | Not used |
| OFF | Not used |
The touchscreen of the 557 provides one touch access to these settings
Press and hold the Home button for 3 seconds to enter the programming menus. The thermostat returns to the last programming menu previously used.
Select a Programming Menu
Setting Items
Backup W2 Differential
The backup heat source operated by W2 has an adjustable differential. The differential is relative to the previous heating stage.
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.
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.
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. | HM1 | ACC RELAY = HUM | None |
| 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. | HM2 | ACC RELAY = HUM | None |
| 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. | HM3 | ACC RELAY = HUM | None |
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. | DHM1 | ACC RELAY = DHUM or Y2 RELAY = DHUM | None |
| 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. | DHM2 | ACC RELAY = DHUM or Y2 RELAY = DHUM | 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. | DHM4 | ACC RELAY = DHUM and Y2 RELAY = HRV | 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. | DHM5 | ACC RELAY = DHUM and Y2 RELAY = HRV | Duct Sensor 083 and Outdoor Sensor 070 |
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.
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.
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
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.
Energy savings can be achieved by lowering the heating temperature and increasing the cooling temperature, for example, at night,
When operating on a programmable schedule
All schedules are stored in permanent memory and are not affected by a loss of power.
| Display | Action |
| | Day temperature |
| | Night temperature |
This thermostat can operate on a programmable schedule in order to automatically lower the room temperature setting. Options include:
Once the type of schedule has been selected, the thermostat can support schedules that have either:
The schedules can be repeated every:
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 from
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.
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 | Scenes = Away Operation | Scenes = All Operation | Scenes = 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.
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.
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:
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.
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.
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
Johnson Controls T7000e LCD Digital Thermostat Johnson Controls T7000e LCD Digital Thermostat Installation Guide
Honeywell T8635L Microelectronic Communicating Programmable Thermostat Honeywell T8635L Microelectronic Communicating Programmable Thermostat USER’s GUIDE
Hetta HS01RF WIRELESS THERMOSTAT Kit PAIRING INSTRUCTIONS Insert batteries into the Thermostat. Ensure that the…
HEAT-MAT NGT-567-0010 Underfloor Heating Thermostat Menu Introduction The NGT thermostat can switch your underfloor heating…
Honeywell RLV450 PROGRAMMABLE THERMOSTAT READ BEFORE INSTALLING DESCRIPTION * LP appears only for the first…
Honeywell RLV431 Programmable Thermostat Description The RLV431 thermostat can be used to control an electric…