Electrical Specifications

The following electrical speciﬁcations tabled below must not be exceeded.

ITEM	DESCRIPTION	LIMIT
Input Voltage	Maximum Input AC Voltage	125 VAC
Input Current	Maximum Input Current	5 AMPS (AC)
Input current	Maximum Current for Single Relay	5 AMPS (AC)
Temperature	Minimum/Maximum Operating Temperature	30° - 110° F
Standby Current	Current with Relay OFF, LED ON	50 mA (AC) Typical
	Current with Relay OFF, LED OFF	30 mA (AC) Typical
Sensor Range	pH	4.22 - 9.78

CONNECTING THE 110VAC POWER SUPPLY

For cord connected installations wait to plug the cord in as the last step in the installation. For hard-wired instal- lations make sure the circuit breaker is off and turn it on as the last step in the installation. Acu-Trol recommends having a licensed electrician perform the installation to ensure all national, state, and local codes are met.

RELAY BOARD CONTROL VOLTAGE SETTING

The relay comes set from the factory for 110 VAC control voltage. Changing the jumper on the relay will allow for different control voltages of 24V or for a Dry Contact Switch (see Fig. 2)

GND

NOB

NOW

Figure 2. Relay Jumper Settings

CHEMICAL FEED PUMP LOCATION

Factory Set- ting

24 VAC

Dry Contact Switch

If the feed pump has not been previously installed, follow the instructions included with the chemical feed pump. Some chemical feed pumps include a power cord and are ready to plug in. If a "pigtail" has been ordered with the Smart pH, simply plug the pump power cord into the "pigtail". If a "pigtail" is not installed the power cord from the pump will need to be modiﬁed. The list below provides overall installation recommendations:

1.Mount at least 10 feet from open water.

2.Install the pump below the level of the Smart pH and away from any other equipment or systems.

3.Install close enough to the Smart pH for the feed pump power cords to reach.

4.If a plug is already on the pump, simply plug in the pump to the Smart pH "pigtail". If pigtails are not installed, you will need to hardwire the pump to the Smart pH relay board.

5.Route the supply power wires to the Smart pH through the lower ﬁtting and attach to the appropriate relay terminals on the relay circuit board (see Section 5, "Wiring Diagram). If the wire ends were striped and not ferruled make sure that no frays of wire are out of the connector as this may lead to a short.

6.PVC conduit can also be used (in accordance with all national, state, and local codes).

7.When installing metal conduit into the controller, a ground LUG should be used (in accordance with all national, state, and local codes) to connect the conduit to the relay board ground.

Smart pH