SECTION 4: TYPICAL EXTERNAL WIRING DIAGRAMS
FIGURE 7: External Wiring Diagram ROBERTS GORDON® EP-203 or EP-303, 208 - 230 V (or 460 V) 3 Ø Pump
EP- 303 3 Ø Pump
Motor Contactors P/N 10050011 P/N 10050012
CAUTION
Product Damage Hazard
Do not directly connect control relay terminals to pump motor.
Failure to follow these instructions can result in product damage.
M
All burners must be connected to Ground (Not shown)
The power supply for the pump must be separate from the controller supply
208 - 230 V (or 460 V)
3Ø
60 Hz | Individual supply | |
L3 | for pump rated for | |
L2 | ||
total full load current. | ||
L1 | See Section 2.3 | |
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TWO PUMP SYSTEM (optional) | ||
Pump 1 may be used for all zones. | ||
Pump | ||
Pump 2 may be used to control zone 3 | ||
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Zone 1 Zone 2 Zone 3 Zone 4 | and/or zone 4. Refer to Pump 1 for configuration. | ||||
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Pressure |
| located in heated zone | Pressure | ||
switch | Zone | Zone | Zone | Zone | switch |
located at | located at | ||||
pump 1 | 1 | 2 | 3 | 4 | pump 2 |
| 120 V |
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120 V | 1 Ø |
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1 Ø | 60 Hz |
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| 24 VAC |
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60 Hz |
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| L |
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| N |
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Ground |
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G |
| N L | N L | N L | N L | N L | N L | 24 VAC PS 1 | R | R | R | R | PS 2 | |
N L | COM |
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| POWER | PUMP 1 | Z1 | Z2 | Z3 | Z4 | PUMP 2 |
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| SUPPLY |
| System Control |
| 24 VAC | PS 1 | W | W | W | W | PS 2 | |||
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| COM |
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4.3 | above shows connection to an | |||||||||||||
Pump External Wiring Diagram |
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The external wiring diagram above shows the connections for four zones of system burners. System burners can be either CORAYVAC® or VANTAGE® NP (multiburner only).
The zones are connected to a single pump, unless zone 3 and/or zone 4 are selected to function with the optional pump 2. The external wiring diagram
4.3.1External Wiring Connection Details
The cable used for all the wiring must be rated for line voltage up to 600 Vac.
The low voltage circuit conforms with Class 2 separa- tion of circuit requirements. National Electrical Codes® for wiring class 2 low voltage circuits must be followed.
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