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Copyright © D 262 -
12/08
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. xxcBelow 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.
Establish the
Problem
Understand the
Sequence of
Operation
Use the Test
Routine
Step 3
- The
Stage 2 contact is turned on for 10 seconds. After 10 seconds, the Stage 1, Stage 2 and Boil P1 contacts are shut off.
NOTE:
Only if there is a boiler demand can the control be paused in step 3.
Step 4
-
MODE —1—
If a DHW Pump is selected as the DHW device, the
DHW Pmp / Vlv contact is turned on for 10 seconds and is then shut off.
If a DHW Valve is selected as the DHW device, the
DHW Pmp / Vlv and Boil P1 contacts are turned on for 10 seconds and
are then shut off.
If
NONE
is selected as the DHW device,
N/A
is displayed for 1 second.
-
MODE —2—
The
DHW Pmp / Vlv contact is turned on for 10 seconds and is then shut off.
NOTE:
Only if there is a
DHW 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 Boiler Control 262 has a function called
Max Heat. In this mode, the 262 turns on and operates the system up to the maximum set
temperatures 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
Boil MAX
is the target boiler supply water temperature.
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
