Introduction
The tekmarNet®4 Thermostat 538 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:
Mounting 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.
Thermostat Wiring
The thermostat operates a single heating system zone. Connect the 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 optional auxiliary sensor wires to sensor terminals 5 and 6.
Testing the Power
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.
Mounting the Thermostat
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 out prior to wiping the control. Do not use solvents or cleaning solutions.
Switches are set to position from the factory and do not require changing for most applications.
Switch | Position | Action |
1 | ON | SETBACK The thermostat follows a programmable setback schedule as a schedule member if available. Requires the installation of a Timer 033 to use this feature. |
OFF | OFF The thermostat does not follow a programmable setback schedule. | |
2 | ON | SCENE The thermostat responds to changes in the scene (system wide manual overrides). Requires the installation of a User Switch 479 to use this feature. |
OFF | OFF The thermostat does not respond to scenes. | |
3 | ON | LOCK ACCESS LEVEL Locked to ‘User’ access level. Set to Lock when installation completed. |
OFF | UNLOCK ACCESS LEVEL Unlock to allow ‘User’ and “Installer’ access level. Set to Unlock during installation process. tekmarNet® reset control must also be set to Unlocked (Installer access level). | |
4 | ON | Not used |
OFF | Not used |
Display
Button Operation
Press the
Symbols Description
Heating Operation
When using only a room temperature sensor, the thermostat operates the heating system to maintain the Set Room Heat temperature. When using only a floor temperature sensor, the thermostat operates the heating system to maintain the Set Floor Heat temperature. In this case, the thermostat does not try to control the air temperature. This is ideal for bathrooms and some kitchen applications where the customer wants their feet to feel warm on the floor. This is also ideal for garages so that the heating system is not affected by the opening of the garage door in cold outdoor weather.
When using both a room temperature sensor and a floor temperature sensor, the thermostat always maintains the Floor Minimum temperature, even when the air temperature is satisfied. When the air temperature is below the Set Room Heat temperature, the thermostat operates the heating system to maintain the Set Room Heat temperature. The floor is never heated above the Floor Maximum setting in order to protect the floor covering. 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 or floor temperature falls below 40°F (4.5°C).
Exercising
When connected to a tekmarNet® reset 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 exercising, 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.
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. 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 an air group, the air temperature readings of all the air group member thermostats are communicated to the air group master and a temperature average 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. If the Set Room Heat temperature is adjusted while the air group is cooling, the snowflake icon is flashed to alert the user that the cooling is presently on. Once the cooling shuts off, the heating can start operation.
Floor Cooling
The thermostat has the option to support radiant floor cooling when connected to a heat pump control using tekmarNet® communication. 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).
Schedules
Lowering the room temperature setting reduces the amount of fuel required to heat the building resulting 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 is shown, as well as a or a . The or indicates the current operating temperature. If a symbol does not appear, there is no schedule available.
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. | |
Heat 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 comfortable at the scheduled time. |
Pressing | Flashing Max | Installer can increase the Maximum Set Room Heat. |
button does | ||
not increase | Floor temperature has reached the Floor | |
temperature | Flashing Floor Max | Maximum setting. If the floor is not heated, then the floor sensor may be faulty and require replacement. |
Pressing | Flashing Min | Installer can decrease the Minimum Set Room Heat. |
button does | ||
not decrease | Floor minimum takes priority over the air | |
temperature | Floor Min | heating temperature. Recommend turning down the floor minimum temperature |
setting. |
Item | Setting | Item | Setting |
Set Room Heat | Set Floor Min | ||
Set Room Heat | Set Floor Max | ||
Set Room Heat Away | Schedule Member | ||
Set Floor Heat | Heat Supply Pump | ||
Set Floor Heat | Heat Supply Pump Delay | ||
Backlight | Heat Cycles Per Hour | ||
Units | Air Group | ||
Max Set Room Heat | Room Sensor | ||
Max Set Room Heat | Sensor | ||
Min Set Room Heat | tekmarNet® Address | ||
Set Floor Min | Floor Cooling |
Technical Data | |
tekmarNet®4 Thermostat 538; One Stage Heat | |
Packaged weight | 0.8 lb. (380 g) |
Enclosure | White PVC plastic, NEMA Type 1 |
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, 32 to 122°F (0 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 Relay | 24 V (ac) 2 A |
Sensors: | NTC thermistor, 10 kΩ @ 77°F (25°C ± 0.2°C) ß = 3892 |
– Optional | tekmar type # 070, 072, 073, 076, 077, 079, 084 |
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: www.tekmarcontrols.com
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
Download manuals:
tekmar D538 digital Thermostat Installational Manual
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…