Daikin DCG Series Service Instructions Manual

Also see for DCC Series: Installation instructions Installation instructions Installation instructions Installation instructions Installation instructions

Contents

SERVICING46S-2 CHECKING WIRINGHIGH VOLTAGE!Disconnect ALL power before servicingor installing this unit. Multiple powersources may be present. Failure to do somay cause property damage, personal injuryor death.1. Check wiring visually for signs of overheating, damagedinsulation and loose connections.2. Use an ohmmeter to check continuity of any suspectedopen wires.3. If any wires must be replaced, replace with comparablegauge and insulation thickness.S-3 CHECKING THERMOSTAT, WIRING, ANDANTICIPATORTHERMOSTAT WIRE SIZING CHARTLENGTH OF RUN MIN. COPPER WIREGAUGE (AWG)25 feet 1850 feet 1675 feet 14100 feet 14125 feet 12150 feet 12S-3A THERMOSTAT AND WIRINGWARNINGLine Voltage now present.With power ON, thermostat calling for cooling1. Use a voltmeter to check for 24 volts at thermostat wiresC and Y in the unit control panel.2. No voltage indicates trouble in the thermostat or wiring.3. Check the continuity of the thermostat and wiring. Repairor replace as necessary.Indoor Blower MotorWith power ON:WARNINGLine Voltage now present.1. Set fan selector switch at thermostat to "ON" position.2. With voltmeter, check for 24 volts at wires C and G.3. No voltage indicates the trouble is in the thermostat orwiring.4. Check the continuity of the thermostat and wiring. Repairor replace as necessary.S-3B COOLING ANTICIPATORThe cooling anticipator is a small heater (resistor) in thethermostat. During the "off" cycle, it heats the bimetalelement helping the thermostat call for the next cooling cycle.This prevents the room temperature from rising too highbefore the system is restarted. A properly sized anticipatorshould maintain room temperature within 1 1/2 to 2 degreerange.The anticipator is supplied in the thermostat and is not to bereplaced. If the anticipator should fail for any reason, thethermostat must be changed.S-3C HEATING ANTICIPATORThe heating anticipator is a wire-wound adjustable heater,which is energized during the "ON" cycle to help preventoverheating of the conditioned space.The anticipator is a part of the thermostat and if it should failfor any reason, the thermostat must be replaced. See thefollowing for recommended heater anticipator setting.To determine the proper setting, use an ammeter to measurethe current on the "W" wire going to the thermostat.Use an amprobe as shown below. Wrap 10 turns of thermo-stat wire around the stationary jaw of the amprobe and dividethe reading by 10.10 TURNS OFTHERMOSTAT WIRE(From "W" on thermostat)STATIONARY JAWOF AMPROBEREADS 4 AMPSCURRENT DRAWWOULD BE .4 AMPSCHECKING HEAT ANTICIPATOR AMP DRAW