T-K3 Service Manual
Ver. 1.05
52
CONFI DENTIAL
12-9. Pump control ON/OFF conditions: Overview
Dipsw itch 3 on the upper bank of dipsw itches
(shown in the picture to the right) also sets the
mode for the pump control ON/OFF conditions.
Again, there are tw o modes of ON/OFF conditions
for the pump control.
In t erm it te n t m o de
This mode is the nor mal, default mode.
Continuous m ode
This mode is f or heating systems that require
pumps to continuously run.
ON/OFF Conditions
Intermittent mode
(Default setting)
<Dipswitch set to OFF>
Continuous mode
<Dipswitch set to ON>
Conditions that
activate the pump
The BTU requirement is more
than 18,600 BTU/h*
OR
30 minutes have elapsed after
previous operation
The BTU requirement is more than
11,900 BTU/h*
Conditions that
deactivate the pump
4 minutes after activation, if
the computer detects a BTU
requirement of less than
18,600 BTU/h, the computer
w ill stop the pu mp in 9 0
seconds.
Non-stop pump oper ation
Once the computer sends an ON
signal to the pump, it w ill never
send a STOP signal. The pump
will continually run non-stop as
long as there is pow er to the T-K3.
*The computer records the inlet temperature and the flow rate of the pump during the final minute
of its previous operation w hen calculating the BTU requirement.
Running pumps continuously for long durations may damage the T-K3 and
can shorten its lifespan. Therefore, running on Continuous mode is not
recommended unless there are strong reasons to do so.
A
TI
N
Dipswitch settings for the ON/OFF
conditions of the pump control
Pump connectors
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