PRINCIPLE OF OPERATION
This schematic shows the damper motor in the closed position. As the thermostat calls for heat, the damper motor is energized as a circuit is made through side “A” of motor switch. (At the same, time a circuit is made through the warp switch heater.) The damper motor begins to open.
Before the damper motor reaches the full open position, side “B” of motor switch closes (providing a low voltage
Warp Switch |
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Contacts |
| Damper Motor |
(Normally Closed) |
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| 3 | |
Contact | ||
Thermostat |
| “C” |
| 4 |
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To auxiliary circuit for operating oil burner or gas valve
NOTE: If same transformer powers both the auxiliary circuit and the damper motor, connect the auxiliary circuit to terminals 1 and 3 instead of 2 and 3.
auxiliary circuit for starting oil burner or opening gas valve), side “A” of motor switch makes with contact “C”, and the warp switch heater opens the warp switch con- tacts. The warp switch heater remains energized and keeps the warp switch contacts open as long as the thermostat calls for heat.
When the thermostat is satisfied, the circuit through the warp switch is broken. After this heater cools for a short time, the warp switch contacts close, energizing the damper motor through side “A” of motor switch. Just after the damper motor begins closing, side “B” of motor switch opens (breaking the auxiliary circuit), while side “A” of motor switch makes with contact 4 just before the damper motor fully closes.
The damper motor draws no current while in the closed position.
Side “A” of |
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Motor Switch | Line | |
Side “B” of | 1 | |
Transformer | ||
Motor Switch | ||
Warp Switch | Motor | |
Heater |
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INTERNAL WIRING |
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EXTERNAL WIRING |
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The system is so wired so that if any one zone still calls for heat, the burner stays on. When all thermostats are satisfied, all dampers will have closed, and the circuit broken to the gas valve or oil burner control.
The blower in the furnace operates as in any conven- tional, unzoned hot air system. When the air in the plenum is warmed to a set temperature, the fan control turns the blower on. When the air temperature drops, the fan control turns the blower off. The addition of zoning has not affected normal fan operation.
INSTALLATION
DUCT LAYOUT
This illustration shows a typical layout for a zoned warm air system using
NOTE
The use of a bypass damper is recommended. See page 6 for details.
INSTALLING DAMPER MOTOR
The following instructions apply for 6, 8, and 10” ducts. (For round ducts and rectangular ducts under 6” a special bracket is available which replaces the
1.Select a convenient position for damper motor instal- lation on duct work to each zone. Carefully locate and mark center line on each side of duct.
2.Mark location for 1⁄2” hole. Also mark locations for holes to attach bearing plate by measuring 15⁄16” from center of 1⁄2” hole. Drill all three holes and attach bearing plate with two #10 sheet metal screws provided.
3.Locate point “X” on center line exactly opposite 1⁄2” hole.
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| Outlet Zone 1 |
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| Outlet |
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| BypassDamper |
| Zone 2 |
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Bypass Duct |
| Parts Group Supply Duct |
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| DAMPER |
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| MOTORS |
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| Outlet |
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| Zone 3 | Zone 4 |
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| Outlet | Zone 4 |
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Return Duct |
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4 Zone Warm Air System
Bearing
Plate
#10 Sheet
Metal Screws
15⁄16” | Point “X” |
1⁄2” Dia. Hole | (locate exactly |
| opposite 1⁄2” hole) |
| Centerlines |
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