Carrier 48HC 04-28 Controls, Start-up, Operation And Troubleshooting

Also see for /50HC 04-28: Manual

Contents

Carrier 48HC 04-28 Controls, Start-up, Operation And Troubleshooting Manual pdf 15 page image

15SERVICE TESTThe Service Test function can be used to verify proper opera-tion of compressors, heating stages, Humidi-MiZer system, in-door fan, power exhaust fans, economizer, and the alarm relay.Use of Service Test is recommended at initial system start upand during troubleshooting (see Table 6 for point details).Service Test mode has the following changes from normaloperation:• Outdoor air temperature limits for cooling circuits, econo-mizer, and heating are ignored. Normal compressor timeguards and other staging delays are reduced to 30 secondsor less.• Circuit alerts are limited to 1 strike (versus 3) beforechanging to alarm shut down state.• The status of ALM.N is ignored so all alerts and alarms arebroadcast on CCN.• The words “SERVICE TEST” are inserted into everyalarm message.Service test can only be turned ON/OFF at the unit display.Once turned ON, other entries may be made with the display orthrough CCN. To turn Service Test on, change the value ofTEST to ON. To turn service test off, change the value ofTEST to OFF.NOTE: Service Test mode may be password protected. Referto Basic Control Usage section for more information. Depend-ing on the unit model, factory-installed options, and field-in-stalled accessories, some of the Service Test functions may notapply.Independent OutputsThe independent (INDP) submenu is used to change output sta-tus for the economizer, power exhaust stages, crankcase heaters,alarm relay, and outside air unit. These independent outputs canoperate simultaneously with other Service Test modes. All out-puts return to normal operation when Service Test is turned off.When the economizer is using the factory default Digital ControlType (ConfigurationECONE.CTL is 1 or 2) then the Econ-omizer Calibration feature may be used to automatically checkand reset the economizer actuator range of motion. Refer to theeconomizer operation section of more details. On EnergyXequipped units, use the outside air unit (OAU) points to test theERV components.Fan TestThe fans (FANS) submenu is used to change output status forthe indoor fan. On single speed fan units the indoor fan contac-tor can be energized or de-energized using the IDF.1 test. Forunits with a VFD the indoor fan speed test (F.SPD) is avail-able. F.SPD runs the fan at the desired speed entered. IDF FanMode (F.MOD) will run the fan at the programmed speed foreach mode. IDF.2 and IDF.3 are reserved for future use.Cooling TestThe cooling (COOL) submenu is used to change output statusfor the individual compressors. Compressor starts are stag-gered by 15 seconds. The fans (FANS) and heating (HEAT)service test outputs are reset to OFF for the cooling servicetest. Indoor fans and outdoor fans are controlled normally tomaintain proper unit operation. If LEN VFD fan is configured,then the indoor fan speed will default to the Mech. Cooling FanSpeed configuration point (ConfigurationI.FANFS.CL)when one compressor is turned on. The Reduced Cool FanSpeed (F.SPD) can only be changed while one stage is run-ning. If more then one stage is on the actual fan speed will be100%. F.SPD shows the reduced speed not actual speed. Onsingle stage units, actual fan speed will be 100% when thecompressor is on. All normal cooling alarms and alerts arefunctional.NOTE: Circuit A will always be operated with Circuit B.Humidi-MiZer® TestFor units with the factory Humidi-MiZer option, the Humidi-MiZer (HZMR) submenu is used to change the output status tooperate the circuits in different Humidi-MiZer modes or to sep-arately test the Humidi-MiZer valve operations. Refer to theHumidi-MiZer operation section for details on these modesand valves. The fans (FANS), cooling (COOL), and heating(HEAT) service test outputs are reset to OFF for the Humdi-MiZer service test. Indoor and outdoor fans are controlled nor-mally to maintain proper unit operation. If LEN VFD fan isconfigured, then the indoor fan speed will default to the Re-heat2 Fan Speed configuration point (Configura-tionI.FANFS.RH) when Reheat2 test is turned on. TheReheat2 fan speed (F.SPD) only reflects the speed setting fortesting Reheat2 circuits, and can only be changed when a cir-cuit is in Reheat2. Actual speed may be different if Reheat 1tests are being performed. All normal cooling alarms and alertsare functional. Refer to the Humidi-MiZer operating sectionfor more information.NOTE: Circuit A will be operated with Circuit B.Table 6 — Service Test Modes and SubmodesDirectoryDISPLAY MENU/SUB-MENU/NAMEEXPANDED NAME VALUESSERVICE TESTTEST Field Service Test Mode Off/OnINDP Test Independent OutputsECON Economizer Position Test 0 to 100%E.CAL Calibrate Economizer Off/OnPE.1 Power Exhaust 1 Test Off/OnPE.2 Power Exhaust 2 Test Off/OnALRM Alarm Relay Test Off/OnOA.DM OAU 2-position Damper Close/OpenWHL OAU Wheel Test 0 to 100%OA.OF OAU OA Fan Speed Test 0 to100OA.XF OAU PE Fan Speed Test 0 to100OA.HT OAU Tempring Heater Test 0 to 100FANS Test FansF.SPD Indoor Fan Speed Test 0 to 100F.MOD IDF Fan Mode 0 to 7IDF.1 Indoor Fan 1 Test Off/OnIDF.2 Indoor Fan 2 Test Off/OnIDF.3 Indoor Fan 3 Test Off/OnCOOL Test CoolingCMP.A Cool A Test Off/OnCMP.B Cool B Test Off/OnF.SPD Reduced Cool Fan Speed 60 to 100HMZR Test Humidi-MiZerRH1.B Reheat1 B Test Off/OnRH1.C Reheat1 C Test Off/OnRH2.A Reheat2 A Test Off/OnRH2.B Reheat2 B Test Off/OnF.SPD Reheat2 Fan Speed 0 to 100CRC Cool->Reheat1 Valve Test Off/OnRHV.A Reheat2 Valve A Test Off/OnRHV.B Reheat2 Valve B Test Off/OnHEAT Test HeatingHT.1 Heat Stage 1 Test Off/OnHT.2 Heat Stage 2 Test Off/OnF.SPD Reduced Heat Fan Speed 0 to 100