Introduction
The tekmarNet®4 Thermostat 540 provides operation for:
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
Choose the placement of the thermostats early in the construction process to enable proper wiring during rough-in.
Consider the following:
Removing The Thermostat Base
To remove the thermostat base:
If a single gang switch box is used, an Adaptor Plate 007 is required to mount the thermostat to the box.
If a switch box was not used, mount the thermostat directly to the wall.
The thermostat operates a single heating system zone together with a cooling system and fan. Connect tN4, C, R, and W terminals on the thermostat to the tN4, C, R and W terminals on the tN4 Wiring Center or Zone Manager. Connect the Rc, Y and G terminals on the thermostat to the R, Y and G terminals on the cooling equipment.
Testing the Power
Testing the Heat, Cool, and Fan Relays
Testing the tekmarNet®4 Bus
The symbol is shown on the display when communication is present. If the thermostat is connected in a network and the communication is missing, there may be an open or short circuit on the tN4 and C bus wires.
To place the thermostat back on the mounting base:
Cleaning the Thermostat
The thermostat’s exterior can be cleaned using a damp cloth. Moisten the cloth with water and wring it out prior to wiping the control. Do not use solvents or cleaning solutions.
Switch Settings
Switches are set to the “On” position from the factory and do not require changing for most applications.
Display
Symbols Description
Mode
The Mode button selects between Auto, Cool, Heat, and Off. Heat Mode: The heating system operates to maintain the Set Room Heat temperature Cool Mode: The cooling system operates to maintain the Set Room
Cool temperature
Auto Mode: The heating system operates to maintain the Set Room Heat temperature. Likewise, the cooling system operates to maintain the Set Room Cool temperature. The thermostat will prevent the Set Room Heat and the Set Room Cool settings from getting closer than 3°F (1.5°C). To switch from heating to cooling, the heat must be off for at least a 30-minute interlock period and the actual Room temperature must be at least 3°F (1.5°C) above the Set Room Heat temperature. To switch from cooling to heating, the cooling must be off for at least a 30-minute interlock period and the Room temperature must be at least 3°F (1.5°C) below the Set Room Cool temperature. Cooling has priority over heating. Off Mode: The heating and cooling are shut off except for heating for freeze protection.
Room
Press the
Fan
The fan button manually turns the fan on or off.
Auto: The fan is usually off but can operate with heating or cooling.
On: The fan is on all the time.
10 to 90%: Fan operates a minimum of this percentage each hour.
Heating Operation
The thermostat operates the heating system to maintain the Set Room Heat temperature. The H1 symbol is shown on the display when the thermostat is heating. The heat can cycle on and off within +/- 1.5°F (1°C) of the Set Room Heat temperature.
Freeze Protection
The thermostat operates the heat whenever the room temperature falls below 40°F (4.5°C), regardless of the thermostat mode.
Heat Terminal Unit
When the thermostat is connected to a tekmarNet® reset control, the heat source can be either hydronic or non-hydronic. When the Heat Terminal is set to Hydronic, the thermostat uses indoor temperature feedback to fine-tune the water temperature and also synchronizes the start of a heating cycle so that all thermostats start heating at the same time. This reduces cycling on the boiler. When the Heat Terminal is set to Other, the thermostat does not use indoor temperature feedback. This allows the thermostat to operate non-hydronic heating systems (for example furnace, electric baseboard, or electric fan coil), while remaining connected to the tekmarNet® system.
Exercising
When connected to a tekmarNet® reset control, and the heating terminal unit is set to hydronic, 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® reset control with the Flushing feature turned on, the thermostat display will display the “FLUSH” icon for the duration of the flushing operation.
Hydronic System Supply Pump
When connected to a tekmarNet® system control, the thermostat’s Heat Supply Pump setting affects how the primary pump or mix pump on the system control operates. When connected to the boiler bus, the boiler system or primary pump is operated. When connected to the mix bus, the mix system pump is operated. If the thermostat operates a motorized or thermal motor zone valve, the Heat Supply Pump setting should be set to On.
If the thermostat operates a thermal motor (wax actuator) zone valve, set the Heat Supply Pump Delay setting to On. This provides a three-minute delay to allow the zone valve to open before the primary or mix pump is turned on. In special applications with multiple zoning manifolds, the Heat Supply Pump setting can be set to Off. This allows a Zone Group Pump located on the Zone Manager, or Wiring Center to operate the pump for the manifold.
DHW Tank Priority
When a tekmarNet® reset control is heating an indirect Domestic Hot Water (DHW) tank, the thermostat may shut off the heating zones to allow the DHW tank to recover quickly. This is determined by the DHW priority of the tekmarNet® reset control.
Warm Weather Shut Down
When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD) setting on the tekmarNet® reset control, the heating system is shut off.
The thermostat operates the cooling system to maintain the Set Room Cool temperature. The C1 symbol is shown on the display when the thermostat is cooling. The cooling can cycle on and off within +/- 1.5°F (1°C) of the Set Room Cool temperature. The cooling system has a fixed minimum on time of 2 minutes and a minimum off time of 5 minutes in order to prevent cooling equipment short cycling.
Air Groups
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. There can be up to 16 different air groups on the same HVAC system. When this thermostat is set as the Air Group master, it operates the cooling equipment for the group. Other thermostats can be set to become members of the same air group. When the cooling is turned on, all air group member thermostats ensure the heating is off. When operating as an air group, the air temperature readings of all the air group member thermostats are displayed on the master as an average. The air group average temperature is shown as the “Room” temperature while the mode is set to Cool, or the mode is set to Auto and the thermostat is allowing cooling operation. In all other modes, the air group master thermostat measures and displays the built-in “local” temperature Air Group sensor measurement.’
Fluctuations in the displayed “Room” temperature may occur during the automatic mode switchover when the display changes from using the local temperature for heating to using the air group average temperature for cooling.
Hydronic Cooling
The thermostat has the option to support hydronic cooling using a fan coil or a chilled beam when connected to a heat pump or chiller tekmarNet® system control.
When operating a chilled beam or a fan coil that uses chilled water for cooling but does not use hot water for heating, then the Cool Terminal Type should be set to Coil. The thermostat activates the Y terminal and also provides a cooling call to the heat pump or chiller control through the tekmarNet® communication. When operating a fan coil that uses both hot and chilled water, then the Cool Terminal Type should be set to H1. The thermostat activates both the Y terminal and the heating terminal device (zone valve or zone pump), as well as provides a cooling call to the heat pump or chiller control through the tekmarNet® communication.
Hydronic System Supply Pump
When connected to a tekmarNet® system control, the thermostat’s Cool Pump setting affects how the primary pump or mix pump on the system controller operates during cooling operation. When connected to the boiler bus, the boiler system or primary pump is operated. When connected to the mix bus, the mix system pump is operated. If the thermostat operates a motorized or thermal motor zone valve, the Cool Supply Pump setting should be set to On. If the thermostat operates a thermal motor (wax actuator) zone valve, set the Cool Supply Pump Delay setting to On. This provides a three-minute delay to allow the zone valve to open before the primary or mix pump is turned on. In special applications with multiple zoning manifolds, the Cool Supply Pump setting can be set to Off. This allows a Zone Group Pump located on the Zone Manager, or Wiring Center to operate the pump for the manifold.
Floor Cooling
The thermostat has the option to support radiant floor cooling when connected to a heat pump control using tekmarNet® communication. The heating terminal unit type must be set to be hydronic (HYD), the floor cooling setting must be set to On and the heating system must be in Warm Weather Shut Down (WWSD). When the heat pump system control operates in cooling mode, all thermostats set for floor cooling on the tekmarNet® bus all activate the first stage heating contact (H1) at the same time to allow chilled water into the system. The thermostat continues to operate the cooling until either the room temperature reaches the Set Heat temperature plus 3°F (Set Heat+1.5°C) or reaches a minimum temperature of 74°F. If only a floor sensor is installed, the floor cooling setpoint is 67°F (19.5°C).
Fan Operation
The thermostat normally operates the fan together with the heating and cooling systems. This is determined by the Fan Mode setting in the Adjust menu.
| Fan Mode | The fan operates with… |
| 0 | Not With Heating Nor Cooling (Only with fan button) |
| 1 | Cooling Only |
| 2 | Heating and Cooling |
| 3 | Heating Only |
The fan relay includes a post-purge feature. After the heating is shut off, the fan continues to operate for 30 seconds. After the cooling is shut off, the fan continues to operate for 10 seconds.
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.
The fan button is inactive when the Fan Mode is 0 and Ventilation is set to Off.
Ventilation Fan
In order to provide ventilation to the building, the fan can also operate for additional time beyond what is required for the heating and cooling systems. Ventilation allows the user to select the fan to operate for a minimum percentage out of each hour. Options are 10 to 90%, in 10% (6 minutes per hour) increments, as well as Auto and On. This is available when the Ventilation setting in the Adjust menu is set to On. Once Ventilation is set to On, the Fan minimum run time percentage during the and events can be set so that the fan can operate on a schedule and/or together with scenes.
Schedules
Lowering the room temperature setting reduces the amount of fuel required to heat the building resulting in energy savings. Likewise, raising the cooling temperature results in energy savings. This thermostat can follow a programmable schedule in order to automatically lower the room temperature setting. A schedule master such as a Timer 033 is required in order to gain programmable schedule functionality. When operating on a programmable schedule, a symbol
When a programmable schedule is selected, there is a time delay for the temperature to change from the temperature
Scenes (System Override)
Scenes provide an easy way to save energy while away on vacation or override a pre-set schedule when plans change. tekmarNet® devices such as a User Switch 479 provide scene adjustment. This thermostat responds to the following scenes:
While in the Away scene, the room temperature cannot be changed using the
| Frequently Asked Questions | ||
| Symptom | Look for… | Corrective Action |
|
No Heat | H1 Symbol | H1 symbol indicates heat is on. Check if zone valve or zone pump is operating. |
| Flashing WWSD | Increase WWSD setting on tekmarNet® reset control. | |
| Flashing Away | Change User Switch to Normal scene 1. | |
| Mode Auto or Heat | Press Mode button to Auto or Heat mode. | |
|
No Cooling | C1 Symbol | C1 symbol indicates cooling is on. Check if cooling relay and cooling equipment are operating. |
| Flashing Away | Change User Switch to Normal scene 1. | |
| Mode Auto or Cool | Press Mode button to Auto or Cool mode. | |
| Heat or Cooling on yet Fan off | Fan symbol | Fan symbol indicates fan is on. Check if fan relay and fan equipment is operating. |
| Fan set to Off | Ensure fan mode is set correctly. | |
| Heat or cooling on before scheduled time | | Optimum start “learns” the heat up and cool off rate of the room and starts the heating or cooling early so that the room is comforable at the scheduled time. |
| Pressing | Flashing Max | Installer can increase the Maximum Set Room Heat or Maximum Set Room Cool limits. |
| Pressing | Flashing Min | Installer can decrease the Minimum Set Room Heat or Minimum Set Room Cool limits. |
| Item | Setting | Item | Setting |
| Set Room Heat | Fan Mode | ||
| Set Room Heat | Fan | ||
| Set Room Heat Away | Fan | ||
| Set Room Cool | Schedule Member | ||
| Set Room Cool | Heat Terminal Type | ||
| Set Room Cool Away | Heat Supply Pump | ||
| Backlight | Heat Supply Pump Delay | ||
| Units | Cool Terminal Type | ||
| Max Set Room Heat | Cool Supply Pump | ||
| Max Set Room Heat | Cool Supply Pump Delay | ||
| Min Set Room Heat | Heat Cycles Per Hour | ||
| Min Set Room Cool | Air Group | ||
| Max Set Room Cool | tekmarNet® Address | ||
| Ventilation | Floor Cooling |
| tekmarNet®4 Thermostat 540; One Stage Heat, One Stage Cool, One Fan | |
| Packaged weight | 0.8 lb. (380 g) |
| Enclosure | NEMA 1, white PVC plastic |
| Dimensions | 2-7/8” H x 2-7/8” W x 13/16” D (73 x 73 x 21 mm) |
| Approvals | CSA C US, meets Class B: ICES and FCC Part 15 |
| Ambient conditions | Indoor use only, 36 to 122°F (2 to 50°C). |
| RH max 92% to 104°F (40°C), and 50% above 104°F (40°C) | |
| Altitude <9840 feet (3000 m), Installation Category II, Pollution Degree 2 | |
| Power supply | 24 V (ac) ± 10% 50/60 Hz, 1.8 VA Standby, 56 VA fully loaded, NEC / CEC Class 2 |
| W, Y and G Relays | 24 V (ac) 2 A |
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 pass-through 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 pass-through 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 LIM-ITED 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.tekmar Control Systems Ltd., Canada tekmar Control Systems, Inc., U.S.A. Head Office: 5100 Silver Star Road Vernon, B.C. Canada V1B 3K4 (250) 545-7749 Fax. (250) 545-0650 Web Site:
Product design, software and literature are Copyright © 2011 by:
tekmar Control Systems Ltd. and tekmar Control Systems, Inc. All specifications are subject to change without notice
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