DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
10.6 DAT Site Connections at Main Circuit Board |
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| Screened Cable |
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| Belden 8451 |
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| (or equivalent) |
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Burner |
| Earthed at one end |
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| 28 |
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| System Ground |
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Modulating Signal |
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| 27 | ||
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0 - 10 DC |
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| - | 26 |
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| + |
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0 V = Minimum Fire |
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+ |
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| Screen |
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| Volt Free Dirty Filter Warning |
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| Dirty Filter Warning 230 V | N | 22 | |
| L | 21 | ||
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| 2nd stage |
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| Volt Free | cooling condenser |
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| Condenser |
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| Control | 1st stage |
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| Circuits | cooling condenser |
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| Fresh air |
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| 16 | |
Cooling Stage 3 |
| Recirc' air |
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Damper |
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(2nd stage | N |
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cooling coil) | Supply |
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Cooling Stage 2 |
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| 13 |
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(1st stage |
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| 12 |
cooling coil) |
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| 11 |
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Cooling Stage 1 |
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(free cooling when |
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fresh air is connected |
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and dampers fitted) |
| Remote Lockout Reset |
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| Lockout Warning 230 V |
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MultiStage |
| Heat ON | N | 5 |
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| Indication |
| 4 | |
Temperature |
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Control |
| 230 V |
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(or similar) |
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| Optional Frost Thermostat 230 V |
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Heating Stage |
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for ON/OFF and |
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Burner Modulation |
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| 3 |
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| 2 |
| Time Switch Control 230 V |
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| 1 |
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| Optional External Fan Control 230 V |
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| 400 V 50 Hz |
| L3 |
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| 3 N Suppy |
| L2 |
| This appliance |
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| L1 |
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| MUST be |
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| N |
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| Earthed |
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| Volt Free Condenser |
| 10 |
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| Control |
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| Circuit Safety Devices |
| 9 |
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