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39 <br />Unit Ventilator/Fan-coil System <br />Under this option, central hat water boilers and a chiller would be provided far heating and <br />cooling sources. Small cabinet fans enclosed with cooling and heating coils would provide <br />air distribution. This type of system provides relatively efficient and low maintenance <br />operation, but uses the same low efficiency filtration of the DX equipment. <br />Advantages <br />• Energy efficient <br />• Over 20 year median useful life <br />• Good temperature control <br />• Low maintenance costs due to central chiller and boiler systems <br />• Relatively quiet operation <br />• Remote access available far control and troubleshooting <br />• Can connect with other centralized digital controls <br />Disadvantages <br />• Relatively high installed cast <br />• Fixed outside air control (fan coils) and low filtration efficiency will not permit adequate <br />indoor air quality control where fan coils are installed <br />• Minimum control over space humidity <br />• Difficult to modify for revised space configurations and usage <br />The following is a typical illustration of a fan-coil system: <br />F~ CaN Hweh~oW~p Sysb~r~ <br />~ F.cesr.w. sew aoo <br />App~011. FNI ~ INw * F~- hl1d, 4 Pq 0001 Or MBA ~~ ~ ~ <br />GMwr~ CMYM! <br />r~r~ ~rnre <br />`° ~ <br />~.{~ <br />11~ VMr~ p ~ Tw~MM~ ~ N . <br />i~ OO F~ Pieel p <br />I~Nt Or~~ d <br />(39) <br />