State GTS-710-PIEA - Manual (Page 22)

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PUMP CONTROL MODE
The water heater 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 water heater. (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 water heater.
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 water
heater.
B) Storage Tank Circulation Control: No.7 ON
Feature: This is to ensure a higher rate of recovery for storage tank applications.
Function: The water heater 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 water heater 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 water heater 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 the water
heater is 130°F (55°C) or above.
Note: The recirculation pump needs to be connected to the pump terminal of the water
heater.