12-8. (A) Pump control ON/OFF Conditions (Only for single and Easy-link system)
To run circulation pumps efficiently and effectively, the T-D2-IN / T-D2-OS offers mode of pump control.
The following table shows the pump control ON/OFF conditions.
“Re-circulation mode”
These functions enable the re-circulation pump to be controlled by the following conditions.
ON/OFF Conditions Re-circulation mode
Conditions that activate
the pump
The BTU requirement is more than 18,600 BTU/h*
OR
30 minutes have elapsed after previous operation
Conditions that
deactivate the pump
4 minutes after activation, if the computer detects a
BTU requirement of less than 14,800 BTU/h, the
computer will stop the pump in 90 seconds.
*The computer records the inlet temperature and the flow rate of the pump during the final minute of
its previous operation when calculating the BTU requirement.
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