The tekmarNet® Thermostat 557 provides operation for:
Additional Features
Getting Started
Congratulations on the purchase of your new tekmar® thermostat. This manual will step through the complete installation, programming and sequence of operations for this control. At the back, there are tips for control and system troubleshooting.
Caution
Improper installation and operation of this control could result in damage to the equipment and possibly even personal injury or death. It is your responsibility to ensure that this control is safely installed according to all applicable codes and standards. This electronic control is not intended for use as a primary limit control. Other controls that are intended and certified as safety limits must be placed into the control circuit.
Tools Required
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.
Consider the following:
Removing The Wiring Cover
To remove the thermostat’s wiring cover:
Mounting The Thermostat
If a single gang box is used:
If a gang box is not used:
The thermostat operates a single heating system zone and can be wired in three different ways.
Stand Alone – Similar to tekmarNet®4 wiring with tN4 wiring terminal not used. First stage heating relay (Rh1 – W1) 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. The tN4 communication bus can also be daisy-chained to allow multiple thermostats to be connected together without home running wires back to the mechanical room.
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 allows easy wiring for retrofit applications.
Compatible Sensors
The thermostat is compatible with Indoor Sensor type 076, 077, 084, Slab Sensor type 072, 073, 079, Outdoor Sensor type 070, Duct Sensor type 083 and Humidity & Temperature Sensor type 086.
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 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.
User Test Sequence
| 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 A 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. Note: 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 |
Home Screen
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 —————————————–
Set Temp Menu
Time Menu
The scheduled menu can operate on a 24-hour or 7-day repeating schedule. When a 24-hour schedule is selected, “SuMoTuWeThFrSa” is shown on the top of the screen to show that the event time applies to all days of the week. When a 7-day schedule is selected, each individual day of the week is shown with the event time.
Display Menu
Scenes Menu
Monitor Menu
Toolbox Menu
Setup Menu
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 heating 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 together 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.
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% |
RH is affected by changes in the ambient air temperature. When using a programmable schedule, the thermostat calculates the relative humidity setpoint with respect to the Set Heat Room setting when in heat mode, the Set Cool Room when in cool mode, and the average between Set Heat Room and Set Cool Room when in auto mode. This may result in changes in displayed RH when the mode is changed.
When the mode is set to off, the humidification and dehumidification systems do not operate.
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 humidifier is operating. Available in all modes except off. | HM2 | ACC RELAY = HUM | None |
| Humidifier with Air Heating Humidifier ducted together with the 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 |
| 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 dehumidifi- cation is operating, at which point dehumidifica- tion 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 upon 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 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 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 |
Air Group Operation
In order to prevent heating and cooling at the same time, this thermostat can operate together with other thermostats on a tekmarNet® system to form an air group. On older model thermostats the air group functionality was previously described as a cool group. In an air group, one thermostat is assigned as the air group master. The air group master operates the cooling equipment for the group. This thermostat can be set to be a member of the air group. When operating as a air group, the air temperature readings of all the air group member thermostats are communicated to the air group master thermostat and an average temperature is determined. When the air group master is in cooling operation, the air group member thermostats do not operate the heating system for air heating.
When operating a heat pump, the 557 also has the ability to prevent air group member thermostats from heating while the outdoor temperature is between the Warm Weather Shut Down (WWSD) and the Radiant Floor WWSD (W1 WWSD) setting. This allows the air system heat pump to heat the building during mild outdoor weather and avoids heating up the radiant floor slab.
If the Set Heat Room temperature is adjusted while the air group is cooling, COOL is flashed on the display to alert the user that the air group cooling system is presently on and heating is not available. Once the cooling system shuts off, heating is available if required.
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 select whether the time is 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 updates 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 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 set to be 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 time period and another for the time period. When touching the up or down arrows to change the temperature, only the temperature for the current time period is changed.
Temporary Hold
A 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 selected, touching the up or down arrows 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 when the building is unoccupied or during the night. When operating on a programmable schedule, or a symbol is shown in the home menu. The
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:
*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:
Schedules with four events per day are common for residential use while two events per day are common for commercial installations.
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 for the room to warm up or cool down from the
Scenes provide an easy way to save energy while away on vacation, or override a programmable schedule when plans change.
Away Key ———————————————————–
This thermostat includes an Away Key to quickly turn down the heating temperatures and increasing the cooling temperatures on all thermostats and suspend heating the domestic hot water tank to maximize energy savings. To enable, go the 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 | Permanent | Permanent | 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 | Permanent |
| 6 | Scene 1 | Scene 1 | Temporary | Permanent |
| 7 | Scene 1 | Scene 1 | Temporary | Permanent |
| 8 | Scene 1 | Scene 1 | Temporary | Permanent |
Secondary Temperature Display
This thermostat can display the outdoor, floor, relative humidity, or the 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:
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.
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 also 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 together 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 Auto.
It is highly recommended to keep a documented list of thermostat addresses. This is extremely helpful when troubleshooting errors. The tekmarNet® system control will display the addresses of thermostats that have errors. By referring to the address documentation, it simplifies the process to locate and correct 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.
| Technical Data | |
| tekmarNet® Thermostat 557; Radiant Floor, 2 Heat Pump/Cool, Backup, Humidity | |
| Literature | 557_A, 557_C, 557_D, 557_Q, 557_U |
| Control | Microprocessor control. This is not a safety (limit) control |
| Packaged weight | 0.9 lb. (400 g) |
| Dimensions | 4-1/2” H x 4-3/4” W x 7/8” D (114 x 120 x 22 mm) |
| Enclosure | White PVC plastic, NEMA Type 1 |
| Approvals | Meets Class B: ICES & FCC Part 15 |
| Ambient conditions | Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing |
| Environmental | Compatible with chlorinated swimming pool environments. Not compatible with ammonia (animal barns), methanol, ethanol, acetone. |
| Power supply | 24 V ±10%, 60 Hz, 2.0 VA standby, NEC / CEC Class 2 |
| Relays | 24 V (ac) 2 A |
| 0-10 Vdc terminal | 3.3 V (dc) for humidity sensor power, 3.0 mA max |
| Humidity sensor | 0 to 90% ± 3% RH |
| Temperature sensor | NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892 |
| – Included | None |
| – Optional | tekmar type # 070, 072, 073, 076, 077, 079, 082, 084, 086 |
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.
Product design, software and literature are Copyright ©2012 by tekmar Control Systems Ltd.,
A Watts Water Technologies Company. Head Offi ce: 5100 Silver Star Road, Vernon, B.C. Canada V1B 3K4, 250-545-7749, Fax. 250-545-0650 Web Site: www.tekmarControls.com
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