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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.

Sketch the piping of the system. This is a relatively simple step that tends to be overlooked, however, it

can often save hours of time in troubleshooting a system. Note flow directions in the system paying close

attention to the location of pumps, check valves, pressure bypass valves, and diverting valves. Ensure

correct flow direction on all pumps. This is also a very useful step if additional assistance is required.

Document the control for future reference. Before making any adjustments to the control, write down

all of the items that the control is currently displaying. This includes items such as error messages,

current temperatures and settings, and which devices should be operating as indicated by the LCD. This

information is an essential step if additional assistance is required to diagnose the problem.

Troubleshooting

Document the

Control

Establish the

Problem

Understanding

the Sequence of

Operation

Use the Test

Routine

Sketch the

Piping in the

System

The control has a built-in test routine, which is used to test the main control functions. The

control continually monitors the sensors, and displays an error message whenever a fault is

found. See the following pages for a list of the control’s error messages and possible causes.

When the Test button is pressed, the test light is turned on. The individual outputs and relays

are tested in the following test sequence.

TEST SEQUENCE

Each step in the test sequence lasts at least 10 seconds.

During the test routine, the test sequence may be paused by pressing the Test button. Only if there is a heat demand can the control

be paused in a step. If the Test button is not pressed again for 5 minutes while the test sequence is paused, the control exits the

entire test routine. If the test sequence is paused, the Test button can be pressed again to advance to the next step. This can also

be used to rapidly advance through the test sequence. To reach the desired step, repeatedly press and release the Test button

until the appropriate device and segment in the display turn on.

Step 1 -The diverting valve is run fully open.

Step 2 -The diverting valve is run fully closed.

Step 3 -The boiler recirculating pump (Boil Pmp) is turned on and waits 10 seconds.

Step 4 -The Boiler Enable contact is turned on for 10 seconds. After 10 seconds, the Boiler Enable and Boil Pmp contacts are shut off.

Step 5 -The test sequence is completed and the control resumes its normal operation.

Testing the Control

Test

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Burnham RTC (Return Temperature Control) Manuale di Installazione Pagina 22

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