How to wire water heater pump correctly?


A customer attempted to install the unit model: 0020483 (S1DA-AC220-ANT2 & CB-2) to time his water heater pump. Everything on the remote unit seems to work OK except that he cannot get voltage from the unit to the pump to make it run.

He installed the wires as follows:

From house/wall AC 120v power black (line) on L, white (neutral) on N.

TO the pump, Black (line) on B, and white (neutral) on C. Timer works fine, however with timer LED light on he get no voltage from A, B, or C. He has checked the terminals with a multi meter and there is no voltage out to the pump. Also he checked the continuity of the cord to the pump–it is OK.

Then why did water heater pump don’t work?

The answer is he didn’t wire the water heat pump correctly.

The receiver he bought is relay output, not AC power output. So the wiring is incorrect. He should also connect black (line) of AC 120v power to terminal C, connect terminal B to Black (line) of the pump, and connect white (neutral) of AC 120v power to white (neutral) of the pump.

Usually, when the receiver is relay output, the wiring operation should be as follow:

Take  model:0020504 (S1U-DC12-ANT2 & CB-2L) as an example:

Connect DC power to terminal “+” and “-“.

Initial state of relay output terminals: Terminals B and C are Normally Open; Terminals A and B are Normally Closed.

Terminal B and C should also connect a DC/AC power supply to make the lamp work.

Here is the circuit diagram.

2 3

This is the correct connection.



Model: 0020424 (S1X-DC06/09/12/24 & C-2) is DC power output, the wiring is easier compare to model:0020504 (S1U-DC12-ANT2 & CB-2L) , which is relay output

When choosing the DC power output unit, you just need to connect DC power to terminals “+” and “-”, and connect lamp to terminals “A” and “B”.

Here is the circuit diagram:






Generally speaking, the wiring differences between relay output and DC/AC power output is that you should also connect a power supply to Normally Open terminal when your receiver is relay output model.

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