Takagi T-M32 - Manual (Page 22)

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PUMP CONTROL MODE
The T-M32 provides the four types of the pump control modes. The pump control modes are
selected by changing dipswitch settings. The dipswitches are located in the right bank of
dipswitches in the upper-left quadrant of the computer board in the T-M32. (See the next page)
A) Recirculation Control: No. 6 ON
Feature: Water heaters can provide hot water as soon as possible like a recirculation usage.
Function: The pump is set only to run when the temperature of the water in the re-circulation
loop is much lower than the set temperature of the T-M32.
The pump will run for about 1 minute in every 30 minutes to determine whether the water
temperature in the whole recirculation loop is lower than 9°F from the set temperature or not.
If the water temperature is lower than 9°F from the set temperature, the pump will remain
running until the water in the loop reach the set temperature. Otherwise, the pump will stop
for another 30 minutes.
If the inlet thermistor of water heaters detects that the water temperature is lower than 9°F
from the set temperature before those 30 minutes have elapsed, the pump will activate
immediately and remain running until the water in the loop reach the set temperature.
Note: The recirculation pump needs to be connected to the pump terminal of the T-M32.
B) Storage Tank Circulation Control: No.7 ON
Feature: This is to ensure a higher rate of recovery for storage tank applications.
Function: The T-M32 makes Water heaters heat the water 5.4°F higher than its set
temperature. The circulation pump (from storage tank to Water heaters) will always remain
on. After hot water temperature reach the temperature above, the T-M32 makes the Water
heaters to adjust the water flow to be less than 2.6 GPM, in order to detect temperature in
the system.
Note: In this mode, the T-M32 will not provide the pump control. The termination of the pump
is kept ON position continually.
C) Energy Conserving Recirculation: No.6 and No.7 ON
Feature: Save Energy Mode in Recirculation Control by keeping the water temperature in
the loop system hot during circulation with Recirculation Control and Pump Control, so it will
cut down the cost of the gas and electricity.
Function: Energy Conserving Recirculation and the Pump Control is similar to the
“Recirculation Control” explained above. The hot water temperature in the loop during
recirculation is kept at maximum 122°F (50 °C) even if the set temperature of T-M32 is 130°F
(55°C) or above.
Note: The recirculation pump needs to be connected to the pump terminal of the T-M32.