Actuators are placed on the hot and chilled water valves, the outside air and return air dampers.
2.
The patent A key factor in this was the distinctive shuttered rotating air damper in the door, which became a feature from the 1840s.
3.
When economizing, the control system will open ( fully or partially ) the outside air damper and close ( fully or partially ) the return air damper.
4.
When economizing, the control system will open ( fully or partially ) the outside air damper and close ( fully or partially ) the return air damper.
5.
A further countwheel mechanism chooses a single or a double blink whilst the air damper at the top of the gear train slows the action to a realistic pace ."
6.
For example : if the smoke alarm is activated, all the outside air dampers close to prevent air coming into the building, and an exhaust system can isolate the blaze.
7.
Gas and oil-fired systems were usually controlled by a thermostat inside the home, while most wood and coal-fired furnaces had no electrical connection and were controlled by the amount of fuel in the burner and position of the fresh-air damper on the burner access door.
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