Daikin DCC Series Installation Instructions Manual

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Daikin DCC Series Installation Instructions Manual Manual pdf 14 page image

14FILTERSCAUTIONT O PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OFEQUIPMENT EFFICIENCY OR EQUIPMENT DAMAGE DUE TO DUST AND LINTBUILD UP ON INTERNAL PARTS, NEVER OPERATE UNIT WITHOUT AN AIRFILTER INSTALLED IN THE RETURN AIR SYSTEM.Every application may require a different frequency of replace-ment of dirty filters. Filters must be replaced at least every three(3) months during operating seasons.Dirty filters are the most common cause of inadequate heating orcooling performance. Filter inspection should be made at leastevery two months; more often if necessary because of local condi-tions and usage.Dirty throwaway filters should be discarded and replaced with anew, clean filter.Disposable return air filters are supplied with this unit. See theunit Specification Sheet or Technical Manual for the correct sizeand part number. To remove the filters, remove the filter accesspanel on return side of the unit.CABINET F INISH M AINTENANCEUse a fine grade automotive wax on the cabinet finish to maintainthe finish’s original high luster. This is especially important in in-stallations with extended periods of direct sunlight.CLEAN O UTSIDE C OIL (Q UALIFIED SERVICER O NLY)The coil with the outside air flowing over it should be inspectedannually and cleaned as frequently as necessary to keep the finnedareas free of lint, hair and debris.L UBRICATIONThe fan shaft bearings , the 1 to 2 HP supply fan motors, the con-denser fan motors and compressors are permanently lubricated.FUNCTIONAL P ARTSRefer to the unit Parts Catalog for a list of functional parts. Partsare available from your distributor.TROUBLESHOOTINGTHE FOLLOWING INFORMATION IS FOR USE BY QUALIFIED SER-VICE AGENCY ONLY: OTHERS SHOULD NOT ATTEMPT TO SERVICETHIS EQUIPMENT.Common Causes of Unsatisfactory Operation of Heat Pump on theHeating Cycle.I NADEQUATE A IR V OLUME T HROUGH INDOOR C OILWhen a heat pump is in the heating cycle, the indoor coil is func-tioning as a condenser. The return air filter must always be clean,and sufficient air volume must pass through the indoor coil to pre-vent excessive discharge pressure, and high pressure cut out.OUTSIDE AIR INTO R ETURN D UCTDo not introduce cold outside air into the return duct of a heatpump installation. For units with 2-speed motors, do not allow airentering the indoor coil to drop below 65° F. Air below this tem-perature will cause low discharge pressure, thus low suction pres-sure, and excessive defrost cycling resulting in low heating output.It may also cause false defrosting.U NDERCHARGEAn undercharged heat pump on the heating cycle will cause lowdischarge pressure resulting in low suction pressure and frost ac-cumulation on the outdoor coil.P OOR “T ERMINATING” S ENSOR CONTACTThe unit’s defrost terminating sensor must make good thermalcontact with the outdoor coil tubing. Poor contact may not termi-nate the unit’s defrost cycle quickly enough to prevent the unitfrom cutting out on high discharge pressure.MALFUNCTIONING REVERSING V ALVE - T HIS MAY BE DUE TO :1. Solenoid not energized - In order to determine if thesolenoid is energized, touch the nut that holds the solenoidcover in place with a screwdriver. If the nut magneticallyholds the screwdriver, the solenoid is energized and theunit is in the cooling cycle.2. No voltage at unit’s solenoid - Check unit voltage. If novoltage, check wiring circuit.3. Valve will not shift:a. Undercharged - check for leaks;b. Valve Body Damaged - Replace valve;c. Unit Properly Charged - If it is on the heating cycle, raisethe discharge pressure by restricting airflow through theindoor coil. If the valve does not shift, tap it lightly onboth ends with a screwdriver handle. DO NOT TAP THEVALVE BODY. If the unit is on the cooling cycle, raise thedischarge pressure by restricting airflow through theoutdoor coil. If the valve does not shift after the aboveattempts, cut the unit off and wait until the dischargeand suction pressure equalize, and repeat above steps. Ifthe valve does not shift, replace it.