Daikin RDT Installation And Maintenance Manual

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Daikin RDT Installation And Maintenance Manual Manual pdf 103 page image

C heCk , TesT, and sTarTwww.DaikinApplied.com 103 IM 893-10 • ROOFPAK SINGLEZONE UNITSPower Up1. Close the unit disconnect switch. With the control systemswitch S1 in the OFF position, power should be availableonly to the control circuit transformer (T1) and thecompressor crankcase heaters.2. Turn the Switch S1 to ON. Power should now besupplied to the control panel, and the LEDs on MCB1should follow the normal startup sequence (refer toPower-up on page 49).Fan Start-up1. Verify all duct isolation dampers are open. Unit mountedisolation dampers may be in the supply or returnsections.2. Place the unit into the Fan Only mode through thekeypad menu Main Menu\Quick Menu\Ctrl Mode = Fan.3. Turn Switch S7 to ON. The controller should enter theStartup Initial operating state. If the fan does not run:a. Check fuses F1 and F3.b. Check the manual motor protectors or that thecircuit breakers have not tripped.c. Check the optional phase monitor.4. If the fans are equipped with optional spring isolators,check the fan spring mount adjustment. When the fansare running they should be level. Refer to Spring IsolatedFans on page 46.5. Verify the fan rotation is correct.6. Verify the DHL safety is opening at a pressurecompatible with duct working pressure limits.NOTE: The supply and return fan drives usually are selectedfor operation in the drive’s mid-speed range. Thereturn fan drives are usually shipped with fixed pitchsheaves that will provide the selected fan speed;however, the supply fan drives are usually shippedwith variable pitch sheaves that are adjusted toprovide the minimum fan speed. Both drives shouldbe adjusted for proper airflow during air balancing.See Air Balancing on page 106.Economizer Start-upCAUTIONAdjust dampers properly. Improper adjustment can damagethe dampers. When an economizer is ordered without anactuator, the linkage requires a 3.14” linear stroke to open itfully. Do not allow dampers to be driven beyond their normalfull closed or full open position.1. Check whether the outdoor air is suitable for freecooling by displaying the keypad menu Main MenuView\Set Unit\Econo Status. See OM 920 “DeterminingEconomizer Status” section. Low indicates low outdoorair enthalpy; High indicates high outdoor air enthalpy.See Enthalpy Control on page 73 to verify thatthe enthalpy changeover control is working properly.You may want to take temperature and humiditymeasurements.2. At the keypad, set the cooling setpoint low enough so thecontroller calls for cooling. Adjust the value in View\SetUnit\Cooling\Occ Clg Spt below the temperature shownin View\Set Unit\Temperatures\Control Temp. In addition,on DAC units, adjust the value in View\Set Unit\Cooling\DAT Clg Spt below the temperature shown in View\SetUnit\Temperatures\Discharge Temp.3. Place the unit into cooling mode through the keypadmenu Quick Menu\Ctrl Mode = Cool Only.4. Observe the outdoor air dampers:a. If the outdoor enthalpy is low, the control algorithmshould start to modulate the dampers open tomaintain the discharge air setpoint.b. If the outdoor enthalpy is high, the dampers shouldmaintain their minimum position. Look at menuView\Set Unit\Min OA Damper\Min OA Pos. Changethis entry to another value. Verify that the dampersmove to the new minimum position setpoint.5. If the unit is equipped with the electromechanicalenthalpy changeover control (Honeywell H205) and theoutdoor air condition is borderline, attempt to change itsinput to the MicroTech III controller by turning the switchadjustment to A or D. Check enthalpy status in keypadmenu Main Menu View\Set Unit\Econo Status. SeeOM 920 “Determining Economizer Status” section. If thisreading is Low, go to Step 5a. If it is High, go to Step 5b.NOTE: It may not be possible to check the economizeroperation in both low and high enthalpy states on thesame day. If this is the case, repeat this procedure onanother day when the opposite outdoor air enthalpyconditions exist.