© 2003
D 369e - 06/03
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Troubleshooting
MAX HEAT (MAX HEAT)
The Zone Control 369e has a function called
Max Heat
. In this mode, the control sets all RTU room temperature settings to
75°F (24°C) and turns on the required contacts. The RTU room setting may be adjusted to turn on or off the required zone
without delay. The control continues to operate in this mode for up to 24 hours or until either the
Item, Menu
or
Test
button is
pressed. 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
▲
or
▼
buttons, select the word YES. After 3 seconds, the control
flashes the word MAX HEAT TEST.
3) To cancel the Max Heat mode, press either the
Item, Menu,
or
Test
button.
4) Once the Max Heat mode has either ended or is cancelled, the control resumes
normal operation.
Menu
Item
Menu
Item
or
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 diag-
nosing 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 mixing valves. Ensure
correct flow direction on all pumps. This is also a very useful step if additional assistance is required.
Establish the
Problem
Understanding
the Sequence of
Operation
Use the Test
Routine
Sketch the
Piping in the
System
