Data Aire DAC Series Operation And Maintenance Manual
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Contents
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113.0 ELECTRICAL CONNECTIONSBefore proceeding with the electrical connections, make certain that the volts, hertz, and phasecorrespond to that specified on the unit electrical nameplate. Use copper conductors only.3.1 Electrical ServiceCheck to be sure the service provided by the utility is sufficient to handle the additional load imposedby this equipment.3.2 Nameplate RatingsRefer to the unit electrical 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 the maximum circuit breaker or fuse size.3.3 GroundingThe unit cabinet must have an uninterrupted true earth ground. An electrical ground wire of adequatesize 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 10% of the voltage indicated on the unit electricalnameplate. Phase to phase imbalance must not exceed 3%. The local utility company should becontacted for correction of improper line voltage. Deviation from voltage ratings can cause prematurefailures and possibly void unit warranties.Check the wiring connections in the unit control panel to ensure they are tight. Screwterminals may become loose in transit. Tightening of wiring connections is the responsibilityof the installing contractor.3.5 Remote ShutdownEvery Data Aire chilled water unit has remote shutdown contacts. These are intended for a fieldsupplied dry contact or switch to be wired across two terminals. When the contact or switch opens, thecontrol circuit power is interrupted and the unit shuts down, including the control panel. The controlcircuit is 24 VAC and the field provided contact or switch should have a minimum rating of 10 amps.The remote shutdown contacts are always terminals #1 and #2 on the terminal block designatedTB1. The unit will ship with a factory wired metal jumper clip that connects terminal #1 to terminal #2.Remove this clip prior to installing the field wires.3.6 Remote Alarm ContactsThe DAP III, microprocessor control panel provides a remote alarm output contact that can be fieldaccessed on terminals #11 and #13 of terminal block TB1. This is a Normally Open, Close on Alarm,dry contact, intended to be used in a control circuit not exceeding 5 amps at 24 VAC.This programmable output contact will close on a failure and remain closed until the alarm is nolonger present. Three additional alarm output contacts come with the optional relay module. The terminaldesignations for these alarm output contact pairs are #40 and #42; #43 and #45; and #48 and #50. |
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