Data Aire DAMA-01 Installation, Operation And Maintenance Manual

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163.0 ELECTRICAL CONNECTIONSWARNING: Before proceeding with electrical connections, make certain thatthe volts, hertz and phase correspond to that specified on the unit electricalnameplate. Use copper conductors only3.1 Electrical ServiceCheck to be sure the service provided by the utility is sufficient to handle the additional load imposedby this equipment. Units with secondary heat exchangers will require a separate power source andfield provided interconnecting control wires as well. Indoor split units typically have a single powersource but can also be provided with separate sources. Field provided interconnecting control wiresare also required. See Section 3.5 (Auxiliary Control Wiring).Remote outdoor condensers and condensing units require one power source. Glycol system withfluid coolers and loose pump(s) typically require one power source for the fluid cooler and will re-quire one additional source for a single pump or two additional sources for dual pumps. Systemswhere the pumps are mounted and piped integral to the fluid cooler will usually require a singlepower source.3.2 Nameplate RatingsRefer to the unit nameplate for equipment electrical requirements. Minimum Circuit Ampacity(MCA), also known as wire sizing amps, will dictate the minimum required wire gauge. MaximumOvercurrent Protection (MOP) Device amps will dictate circuit breaker or fuse size.3.3 GroundingThe unit cabinet must have an uninterrupted true earth ground. An electrical ground wire of ad-equate size must be connected to the ground lug provided inside the main electrical box.3.4 Voltage ToleranceThe supply voltage to the unit must be within tolerance: - 5% to + 10% for 208-230 voltage. + 10%for 460 volts. Phase to phase imbalance must not exceed 3%. The local utility company should becontacted for correction if improper line voltage exists. Deviation from ratings can cause prematurefailures and possibly void unit warranty.3.5 Auxiliary Control WiringFor secondary heat exchangers (condensers and fluid coolers) connect two 18 gauge wires fromthe electrical box of the indoor evaporator to the electrical box of the remote heat exchanger. Referto the wiring diagrams located in the electrical control panel of each unit. Follow the wiring diagramsfor each piece of equipment. On most remote heat exchangers the terminals will #30 and #40. Allcontrol wiring on Data Aire equipment is 24 VAC.