Installer’s Guide
TWINNING
These furnaces may be twinned. Twinning requires that two furnaces with the same configuration, capacity, and airflow must be used. They shall have common returns with equal pressure drops or ducts with equivalent lengths and sizes. See Field Wiring Diagrams below for proper hookup.
| TWINNING CONNECTION DIAGRAM | |
| FOR TWINNING 1 STAGE FURNACES WITH | |
| SINGLE WIRE TWINNING FEATURE | |
1 STAGE HEAT | 1 STAGE HEATING ONLY THERMOSTAT | |
ONLY |
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THERMOSTAT |
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(WITH FAN SWITCH) | FURNACE NO. 1 | FURNACE NO. 2 |
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| BLOWER OPERATION OF |
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| UNIT NO. 2 IS SYNCRONIZED |
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| WITH UNIT NO. 1 VIA SIGNALS |
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| FROM TWIN CONNECTION. |
| TWIN | TWIN |
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| SEE NOTE 4 |
| ISOLATION RELAY |
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| (FIELD SUPPLIED) |
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| SEE NOTE 4 |
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| R1 | R1 |
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| ISOLATION RELAY |
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| SEE NOTE 4 |
B/C | SEE NOTE 3 | B/C |
B/C | ||
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| From Dwg. 21B341422 Rev. 3 |
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| TWINNING CONNECTION DIAGRAM |
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| FOR TWINNING 1 STAGE FURNACES WITH |
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| SINGLE WIRE TWINNING FEATURE |
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| 1 STAGE | 1 STAGE HEAT / 1 STAGE COOL THERMOSTAT |
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OUTDOOR UNIT |
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HEATING / COOLING |
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(WITH TRANSFORMER) |
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THERMOSTAT |
| FURNACE NO. 1 | FURNACE NO. 2 |
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| BLOWER OPERATION OF |
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| UNIT NO. 2 IS SYNCRONIZED |
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| WITH UNIT NO. 1 VIA SIGNALS |
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| FROM TWIN CONNECTION. |
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| TWIN | TWIN |
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RC |
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ISOLATION RELAY |
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(FIELD SUPPLIED) |
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SEE NOTE 3 |
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| SEE NOTE 4 |
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OUTDOOR UNIT |
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(NO TRANSFORMER) |
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| R1 |
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| ISOLATION RELAY |
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| SEE NOTE 4 |
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| SEE NOTE 5 | B/C | R1 |
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| B/C | B/C |
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| ISOLATION RELAY |
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| (FIELD SUPPLIED) |
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| SEE NOTE 4 | From Dwg. 21B341423 Rev. 2 |
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18 |
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