Raypak 302B Field Wiring Connection, Check the Power Source, Making the Electrical Connections

Check the Power Source

WARNING: Using a multi-meter, check the following voltages at the terminal block inside the unit. Make sure proper polarity is followed and house ground is proven. (See Fig. 18.)

BLACK CIRCUIT

BREAKER

WHITE

GREEN

GROUND

A B C

Fig. 18: Wiring Connections

Check the power source:

AC = 108 VAC Minimum, 132 VAC MAX AB = 108 VAC Minimum, 132 VAC MAX BC = <1 VAC Maximum

Fig. 19: Multi-meter

2.Turn off all power to the heater. Verify that power has been turned off by testing with a multi-meter prior to working with any electrical connections or components.

3.Observe proper wire colors while making electri- cal connections. Many electronic controls are polarity sensitive. Components damaged by improper electrical installation are not covered by warranty.

4.Provide overload protection and a disconnect means for equipment serviceability as required by local and state code.

5.Install heater controls, thermostats, or building management systems in accordance with the applicable manufacturers’ instructions.

6.Conduit should not be used as the earth ground.

Field Wiring Connection

NOTE: A grounding electrode conductor shall be used to connect the equipment grounding conductors, the equipment enclosures, and the grounded service conductor to the grounding electrode.

If the heater does not have a factory-wired stage con- troller, it is factory-wired in an on-off configuration with other stage terminals jumpered.

To field-connect a stage controller, remove factory- installed jumpers and wire stage controller as shown in Fig. 21.

Making the Electrical Connections

Refer to Fig. 18-23.

1.Verify that circuit breaker is properly sized by referring to heater rating plate. A dedicated circuit breaker should be provided.

Fig. 20: Wiring Location

CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause im- proper and dangerous operation. Verify proper operation after servicing.

CAUTION: For pumps larger than 3/4 HP, a separate circuit breaker may be required.

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