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9.3.2 Water Circulator Pump Testing
Tools Required:
Flat blade screwdriver or nut driver, volt meter.
Circulator Function:
Circulates water through the hydronics closed loop system in order to provide heat.
During a portion of this test, high voltage electrical components will be
energized. Only a certified electrician is to perform the following procedures, and with
extreme caution.
Procedure:
1. Make sure that there is a call for heat or jumper the thermostat circuit on the triple
aquastat.
2. Allow the burner to heat the boiler vessel until the temperature in the vessel is above
the low limit setting (plus differential setting minus 10°F). Above this temperature, the
pump will be called upon to operate.
3. Check the voltage across the triple aquastat terminals C1 and C2. There should be 115
volts.
a. If not, replace the triple aquastat controller.
b. If there is 115v, check the voltage at the circulator pump.
i.
If there is not 115v at the pump, check and repair the circuit between the
controller and the pump.
ii. If there is 115v at the pump but the pump does not run, replace the pump.
Note: If using a relay from the C1 and C2 to power the pump, check the function of the relay
circuit prior to checking the pump.
