Troubleshooting – tekmar 362 Mixing Control Installation User Manual

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Establish the

Problem

Understand the

Sequence of

Operation

Use the Test

Routine

Menu Item

Step 4

- The

Boiler contact is turned on for 10 seconds. After 10 seconds, the Boiler and Mix Pmp contacts are shut off.

NOTE: Only if there is a boiler demand can the control be paused in step 4.

Step 5

- After the test sequence is completed, the word COMPLETE is displayed for 1 second and the control resumes its

normal operation.

MAX HEAT (MAX HEAT)

The Mixing Control 362 has a function called Max Heat. In this mode, the 362 turns on and operates the system up to the maximum
set temperatures, and the mixing device at the set percentage, as long as there is a demand for heat. The control continues to operate
in this mode for up to 24 hours or until either the Item, Menu or Test button is pressed. This mode may be used for running all circulators
during system start-up in order to purge air from the piping. To enable the Max Heat feature, use the following procedure.

1) Press and hold the Test button for more than 3 seconds. At this point, the control

displays the words MAX HEAT and the word NO.

2) Using the Up or Down buttons, select the word YES. After 3 seconds, the control flashes

the word MANUAL and the number 100. This number represents the desired output from
the mixing device.

3) Set the desired output of the mixing device by using the Up and / or Down buttons on

the control.

4) To cancel the

Max Heat mode, press either the Item, Menu, or Test button.

5) Once the

Max Heat mode has either ended or is cancelled, the control resumes

normal operation.

Troubleshooting

When troubleshooting any heating system, it is always a good idea to establish a set routine to follow. By following a consistent routine,
many hours of potential headaches can be avoided. Below is an example of a sequence that can be used when diagnosing or
troubleshooting problems in a hydronic heating system.

Establish the problem. Get as much information from the customer as possible about the problem.
Is there too much heat, not enough heat, or no heat? Is the problem only in one particular zone or
area of the building or does the problem affect the entire system? Is this a consistent problem or only
intermittent? How long has the problem existed for? This information is critical in correctly
diagnosing the problem.

Understand the sequence of operation of the system. If a particular zone is not receiving enough
heat, which pumps or valves in the system must operate in order to deliver heat to the affected zone?
If the zone is receiving too much heat, which pumps, valves or check valves must operate in order
to stop the delivery of heat?

Press the Test button on the control and follow the control through the test sequence as described
in the Testing section. Pause the control as necessary to ensure that the correct device is operating
as it should.