John Wood Takagi - 710 - Manual (Page 13)

13
Pump Control Mode
The 710 provides the four types of the pump control
modes. The pump control modes are selected by chang-
ing DIPswitch settings. The DIPswitches are located in the
right bank of DIPswitches in the upper-left quadrant of the
computer board in the 710 (see the next column).
DIPswitch settings for the Pump control mode
Pump Control Modes
A)
Recirculation
Control B) Storage
Tank
Circulation
Control C) Energy
Conserving
Recirculation D) Normal
Control
(Default)
8
7
6
5
4
3
2
1
ON
8
7
6
5
4
3
2
1
ON
8
7
6
5
4
3
2
1
ON
8
7
6
5
4
3
2
1
ON
The dark squares indicate the direction the DIPswitches
should be set to.
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 tempera-
ture of the water in the re-circulation loop is much
lower than the set temperature of the 710. The
pump will run for about 1 minute in every 30 min-
utes to determine whether the water temperature
in the whole recirculation loop is lower than 5C°
(9F°) from the set temperature or not. If the water
temperature is lower than 5C° (9F°) 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
5C° (9F°) 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 710.
Right bank of
DIPswitches
B) Storage Tank Circulation Control: No. 7 ON
Feature: This is to ensure a higher rate of recovery for
storage tank applications.
Function:
The 710 makes Water heaters heat the water
3C° (5.4F°) 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
710 makes the Water heaters to adjust the water
flow to be less than 9.8 l/min (2.6 GPM (US)), in
order to detect temperature in the system.
Note: In this mode, the 710 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
50°C (122°F) even if the set temperature of 710
is 55°C (130°F) or above.
Note: The recirculation pump needs to be connected to
the pump terminal of the 710.
D) Normal Control (Default): No. 6 and No. 7
OFF:
Feature: This mode provides no special pump control. The
pump operation can only be turned ON and OFF
by the remote controller.
Function:
If a pump is connected to the pump control termi-
nal and both No. 6 and No. 7 are OFF, the pump
will be made to run all the time as long as there
is a power supply to the 710. The pump will stop
when the remote controller is turned off. Water in
the loop will be maintained at set temperature.