SYSTEM CONTROL INSTALLATION, OPERATION AND SERVICE MANUAL
FIGURE 6: External Wiring Diagram ROBERTS GORDON®
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.
6 4
M
3
5
2
1
The power supply for the pump must be separate from the controller supply
208 - 230 V
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| 1 Ø | Individual supply for | ||
L1 |
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| pump rated for total full |
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L2 |
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| 60 Hz load current. See Section | |
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| 2.3 for details. |
| All burners must be | TWO PUMP SYSTEM (optional) | ||||
| Pump 1 may be used for all zones. | |||||
| connected to Ground | Pump 2 may be used to control zone 3 | ||||
| (Not shown) |
| and/or zone 4. Refer to Pump 1 for configuration. | |||
Zone 1 Zone 2 Zone 3 Zone 4 |
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| Low voltage thermostats |
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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 |
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| 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 |
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| 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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4.2 | pump. |
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Diagram |
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| 4.2.1 External Wiring Connection Details |
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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 VAN- TAGE® 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 above shows connection to an EP 301 or
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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