Daikin DCC180 Installation Instructions Manual

Also see for DCC180 Series: Service instructions

Contents

Daikin DCC180 Installation Instructions Manual Manual pdf 11 page image

11O BSTRUCTIONS, FAN CLEARANCE AND W IRINGRemove any extraneous construction and shipping materials thatmay be found during this procedure. Rotate all fans manually tocheck for proper clearances and that they rotate freely. Check forbolts and screws that may have jarred loose during shipment tothe job site. Retighten if necessary. Re-tighten all electrical con-nections.FIELD D UCT C ONNECTIONSVerify that all duct connections are tight and that there is no airbypass between supply and return.FILTER SECTION C HECKRemove filter section access panels and check that filters are prop-erly installed. Note airflow arrows on filter frames.P RE-STARTUP P RECAUTIONSIt is important to your safety that the unit has been properlygrounded during installation. Check ground lug connection in maincontrol box for tightness prior to closing circuit breaker or discon-nect switch. Verify that supply voltage on line side of disconnectagrees with voltage on unit identification plate and is within theutilization voltage range as indicated in Appendix C Electrical Data.System Voltage - That nominal voltage value assigned to a circuitor system for the purpose of designating its voltage class.Nameplate Voltage - That voltage assigned to a piece of equip-ment for the purpose of designating its voltage class and for thepurpose of defining the minimum and maximum voltage at whichthe equipment will operate.Utilization Voltage - The voltage of the line terminals of the equip-ment at which the equipment must give fully satisfactory perfor-mance. Once it is established that supply voltage will be main-tained within the utilization range under all system conditions,check and calculate if an unbalanced condition exists betweenphases. Calculate percent voltage unbalance as follows:Three Phase Models Only3) PERCENT VOLTAGEUNBALANCE2) MAXIMUM VOLTAGE DEVIATIONSFROM AVERAGE VOLTAGE1) AVERAGE VOLTAGEHOW TO USE THE FORMULA:EXAMPLE: With voltage of 220, 216, and 2131) Average Voltage = 220+216+213=649 / 3 = 2162) Maximum Voltage Deviations from Average Voltage = 220 - 216 = 43) Percent Voltage Unbalance = 100 x = = 1.8%Percent voltage unbalance MUST NOT exceed 2% .4216400216= 100 XAIRFLOW ADJUSTMENTSThe drive on the supply fan is typically set in the middle of theRPM range. The drive motor sheave pitch diameter is field adjust-able for the required airflow. Refer to the following “DriveAdjustments” section.When the final adjustments are complete, the current draw of themotor should be checked and compared to the full load currentrating of the motor. The amperage must not exceed the servicefactor stamped on the motor nameplate. The total airflow mustnot be less than that required for operation of the electric heatersor the furnace.If an economizer is installed, check the unit operating balance withthe economizer at full outside air and at minimum outside air. Uponcompletion of the air flow balancing, we recommend replacingthe variable pitched motor sheave with a properly-sized fixedsheave. A matching fixed sheave will provide longer belt and bear-ing life and vibration free operation. Initially, it is best to have avariable pitched motor sheave for the purpose of airflow balanc-ing, but once the balance has been achieved, fixed sheaves main-tain alignment and minimize vibration more effectively.NOTE: Airflow setting below 300 CFM/ton is not recommended,as evaporator freezing or poor unit performance is possible. For2-speed models, airflow adjustments must be made with theevaporator fan motor operating at high speed (in 2nd stage cool-ing or in heat mode). 2-Speed models have a “V” in 11th digit ofthe model number (e.g. DCC300XXX3V).SET EVAPORATOR FAN RPMActual RPM’s must be set and verified with a tachometer or strobelight. Refer to Appendices A and B for basic unit fan RPM. Referalso to “Airflow” section of this manual. With disconnect switchopen, disconnect thermostat wires from terminals Y and W. Thiswill prevent heating and mechanical cooling from coming on. Placea jumper wire across terminals R and G at TB1 terminal block. Closedisconnect switch; evaporator fan motor will operate so RPM canbe checked.E VAPORATOR F AN R OTATION C HECK (THREE P HASE M ODELS O NLY )Check that fan rotates clockwise when viewed from the drive sideof unit and in accordance with rotation arrow shown on blowerhousing. If it does not, reverse the two incoming power cables atSingle Point Power Block. In this case, repeat bearing check.Do not attempt to change load side wiring. Internal wiring assuresall motors and compressors will rotate in correct direction onceevaporator fan motor rotation check has been made.E LECTRICAL INPUT C HECKMake preliminary check of evaporator fan ampere draw and verifythat motor nameplate amps are not exceeded. A final check ofamp draw should be made upon completion of air balancing ofthe duct system (see Appendix C).BELT DRIVE MODELS ONLYBEARING C HECKPrior to energizing any fans, check and make sure that all setscrewsare tight so that bearings are properly secured to shafts.TENSION AND A LIGNMENT A DJUSTMENTCorrect belt tension is very important to the life of your belt. Tooloose a belt will shorten its life; too tight, premature motor andbearing failure will occur. Check you belt drive for adequate “run-in” belt tension by measuring the force required to deflect the