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Fig. 12.3.5a hvac schematic key m damper motor t1 mixed air controller t2 outside air temperature limit controller t3 hot deck temperature controller t4 cold deck temperature controller t5 individual room thermostat t6 night thermostat [remove]

fs freezestat ep-1 main air control pe-1 pneumatic day / night switchover [remove]

sr switching relay for minimum air prv minimum air pressure reducing valve

51 emcs hot deck temperature sensor

52 emcs cold deck temperature sensor

53 emcs mixed air temperature sensor

54 emcs return air temperature sensor simple radio signals, which are relatively low cost, but slow. Other systems are based on cellular telephone technology, which can provide greater range and faster data transmission speed, but which may be more expensive to own and operate.

• Fiber Optic Communication. Due to the desire to have ultra fast data transmission capabilities for computer network applications, many buildings and campuses are now installing fiber optic networks. Such networks—which have sufficient bandwidth to provide telephone, computer network, and EMCS communication simultaneously—provide the fastest data transmission rates, but are also expensive to install. Many military bases and college campuses have recently installed fiber optic "backbones" to allow inter-building computer network communication. Such scenarios present an excellent opportunity to replace archaic dial-up modem EMCS systems with modern systems that can provide more elaborate control sequences and better accuracy.

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