Carrier GR-45 Operation And Service

Contents

Carrier GR-45 Operation And Service Manual pdf 26 page image

2-5 T--2952.4.2 ControlNOTE1 This procedure should be performed by anHVAC technician who has been trained onCarrier Model GR system design. Controlconfiguration is preset by the manufacturerand resetting of the parameters should notbe required. It is recommended that CarrierService or Engineering is contacted beforeany control configuration is changed.Carrier can not be responsible for failures ordamage resulting from unauthorizedchanges.2 If a replacement Logic Module is installed,it is necessary to match the configurationjumpers (see Figure 1-10) to the originalboard. Refer to paragraph 4.24.a. Turn the A/C main power switch (located in the driv-er’s area) to OFF.b. Connect the Micromate to the service port located inthe return air section.c. Unplug the logic board connector J3.d. Turn the A/C main power switch back to the ON posi-tion.e. Activate the system by pressing the 1/0 key on theMicromate panel.NOTEBe sure to reconnect J3 when testing is com-pleted or the system will fail to operate whenthe Micromate is disconnected.NOTEWhen modifying the setpoint temperature fordiagnostic purposes, be sure to reset the set-point when testing is complete.2.4.3 Diagnostic ModeDiagnostic mode can be entered by pressing the up anddown arrow keys simultaneously for 5 seconds.Diagnostic mode allows alarms and system parametersto be viewed. If there are any alarms stored, the mostrecent alarm will be shown. To view additional alarminformation, refer to section 3. Press the up and downarrow keys to view parameters.2.4.4 System ParametersPressing the up/down arrow keys will allow the user toscroll up or down through the parameters. If no key ispressed for 30 seconds this mode is exited and thedisplay will revert back to the default display. Pressingthe on/off key any time will exit this mode and thedisplay will again indicate the default. The parametersare shown in Table 2-3. When scrolling through theparameters, the current parameter will be displayed fortwo seconds. After two seconds, the display will showthe data for the current parameter. When the lastparameter is reached, the list will wrap back to P1.2.4.5 Test ModeWith the system in normal operation, the controller maybe placed in the test mode, by doing the following:a. Enter the diagnostic mode by pressing the up anddown arrow keys simultaneously for 5 seconds. Enterthe test mode by pressing the COOL key five times.b. In the test mode, the display will read “T##” where“##” indicated the test number that is currently run-ning.c. The initial indication will be “T00”. This indicatesthe controller is in the test mode and all relays are de--energized. Press the arrow keys to scroll through andperform each test When the highest test number isreached, the display will increment back to the lowesttest number. A listing of tests is provided inTable 2-2.d. To terminate testing, press the I/0 key.Table 2-2. Controller Test ListTEST OUTPUT STATET00 All Relays OffT01 Evaporator High OnT02 Evaporator Low OnT03 Condenser High OnT04 Condenser Low OnT05 Compressor OnT06 Unloader Valve 1 OnT07 Unloader Valve 2 OnT08 Fresh Air Damper OnT09 Heat OnT10 Fault OnT11 Boost OnT12 Spare/Motor Input On