Tekmar Universal Reset Module 422

Other manuals for Tekmar Universal Reset Module 422

Questions and Answers

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William SanchezJul 25, 2025
What to do if my Tekmar Control Unit display is not on?
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  james97Jul 25, 2025
  If the display is not on, first verify that there is voltage reaching the control by checking the breaker panel or disconnect and testing the voltage with a voltmeter. Next, make sure the plugs are securely connected between the 422 and the Zone Manager pins. Finally, inspect the fuse on the Zone Manager and check the total VA draw on all thermostats and zone valves connected to the Zone Manager, ensuring it does not exceed 40 VA. If the fuse is blown, replace it.
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Connor SanchezAug 2, 2025
Why Tekmar Control Unit boiler does not fire when there is a DHW or Setpoint Demand?
- C
  Craig SmithAug 2, 2025
  The boiler might not fire due to several reasons. There may be no voltage present on the demand terminals, so test the voltage across the demand terminals using a voltmeter. The control could be in Unoccupied mode and DHW Unoccupied or Setpoint Unoccupied is set to OFF, so check which schedule the 422 is operating on. Also, the boiler contact might not be connected to the boiler thermostat connection; in this case, trace the wires from the boiler contact to the boiler thermostat connection and use the Test sequence to check the boiler contact.
A
Andrew RodriguezAug 9, 2025
What to do if Tekmar Universal Reset Module 422 Control Unit variable speed injection pump does not operate?
- A
  Alicia GravesAug 9, 2025
  If the variable speed injection pump isn't working, first check that the Mix 1 Mode setting is set to VAr, because there may be no current present on the variable speed injection pump. Also, the variable speed injection pump will not operate until the boiler supply temperature exceeds the boiler minimum setting due to Boiler Return Protection. Ensure that a wet rotor pump has been installed. If a non-wet rotor pump has been installed, read E 021 and check pump type. Finally, check if the fuse is blown; if so, determine if the pump is jammed or seized and replace the fuse.
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Roy MartinAug 16, 2025
How to fix a Tekmar Control Unit mixing valve that will not open?
- M
  meganallenAug 17, 2025
  If the mixing valve won't open, it could be due to several reasons. Check that the Mix 1 Mode setting is set to FLt, because there may be no voltage present on the actuator motor. The mixing valve will also not open until the boiler supply temperature exceeds the boiler minimum setting due to Boiler Return Protection. Another possible cause is the actuator rotating in the wrong direction to open the valve; if this is the case, reverse the open and close wires on the actuator.

Tekmar Universal Reset Module 422 Specifications

General

Model	422
Category	Control Unit
Input Voltage	24 VAC
Operating Voltage	24 VAC
Output Voltage	24 VAC
Mounting	Surface mount
Temperature Range	0 to 50°C
Operating Temperature	0 to 50 °C
Application	Universal Reset Module