Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for 48PG20---28: User's information manual User's information manual Installation and service instructions

Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 36 page image

Control Configuration Checklist- Refer to check-list CL- 1 for recording site specific unit control configurations.Programming Operating Schedules -- TheComJbrtLink TM controls wilt accomlnodate up to eight differ-ent schedules (Periods 1 through 8), and each schedule isassigned to the desired days of the week. Each scheduleincludes an occupied on and offtilne. As an example, to set anoccupied schedule for 8 AM to 5 PM tbr Monday throughFriday, the user would set days Monday through Friday to ONfor Period 1. Then the user would configure the Period 1Occupied From point to 08:00 and the Period 1 Occupied Topoint to 17:00. To create a difl_em weekend schedule, the userwould use Period 2 and set days Saturday and Sunday to ONwith the desired Occupied On and Offthnes.NOTE: By default, the time schedule periods are pro mmnlnedfor 24 hours of occupied operation.To create a schedule, perform the following procedure:1. Scroll to the Configuration mode, and select CCNCONFIGURATION (CCN). Scroll down to the ScheduleNumber (Configuration_C_--x_CH.O=SCH.3_). It"password protection has been enabled, the user will beprompted to enter the password before any new data isaccepted. S(_/L.N has a range of 0 to 99. The default val-ue is 1. A value of 0 is always occupied, and the unit willcontrol to its occupied set points. A value of 1 means theunit wilt follow a local schedule, and a value of 65 to 99means it will tbltow a CCN schedule. Schedules 2-64 arenot used as the control only supports one internal/localschedule. If one of the 2-64 schedules is confimlred, thenthe control will tbrce the number back to 1. Make sure thevalue is set to 1 to use a bcal schedule.2. Enter the Time Clock mode. Scroll down to the LOCALTIME SCHEDULE (S(_.L) sub-lnode, and press. Period 1 (PER.l) will be displayed.3. Scroll down to the MON point. This point iMicates ifschedule 1 applies to Monday. Use the _ com-mand to go into Edit mode, and use the [] or [] key tochange the display to YES or NO. Scroll down throughthe rest of the days and apply schedule 1 where desired.The schedule can also be applied to a holiday.Configure the beginning of the occupied time period forPeriod 1 (OCC). Press _ to go into Edit mode,and the first two digits of the 00.00 will start flashing. Usethe [] or [] keyto display the correct value for hours,in 24-hour 0nilitary) time. Press _ and hour valueis saved and the minutes dints will start flashing. Use thesaane procedure to display and save the desired minutesvalue.5. Conllgnlre the unoccupied time for period 1 (UN{). Pressto go into Edit mode, and the first two digits ofthe 00.00 wilt start flashing. Use the [] or [] key todisplay the correct value for hours, in 24-hour (military)time. Press _ and hour value is saved and theminutes digits will start tlashing. Use the same procedureto display and save the desired minutes value.6. The first schedule is now complete. If a second scheduleis needed, such as tbr weekends or holidays, scroll do,amand repeat the entire procedure for period 2 (PER.2). It"additional schedules are needed, repeat the process for asmany as are needed. Eight schedules are provided. SeeTable 35 for an example of setting the schedule.SERVICE TESTThe Service Test function can be used to verify proper oper-ation of compressors, heating stages, indoor tan, outdoor finis,power exhaust tans, economizer, and atann relay. Use ofService Test is recommended at initial system start up and dur-ing troubleshooting. See Table 36.Sin:ice Test modeehas the following changes fiom nonnaloperation:• Normal compressor timeguards and other staging delaysare reduced to 30 seconds or less.• Circuit alerts are limited to 1 strike (versus 3) beforechanging to alarm shut down state.• The status of ALM.N is iNlored so all alerts and alarmsare broadcast on CCN.• The words "SERVICE TEST" are inserted into everyatann message.Smqce test can only be turned ON/OFF at the unit display.Once mined ON, other entries may be made with the display orthrough CCN.NOTE: Service Test mode may be password protected. Referto Scrolling Marquee section on page 3 for more information.To tum Service Test on, change the value of TEST to ON.To turn service test off; change the value of TEST to OFF.The independent (INDP) submenu is used to change outputstares for the economizer, power exhaust stages, and the alarlnrelay. These independent outputs can operate simultaneouslywith other Service Test modes. All outputs return to norlnaloperation when Smqce Test is mined off When the economiz-er is using the factory default Digital Control Type (_bnfigura-Iion--gECON--gE.(TL is 1 or 2) then the Economizer Calibra-tion feature may be used to automatically check and reset theeconomizer actuator range of motion.The fans (FANg) submenu is used to change output statusfor the indoor thn and outdoor tan stages.The cooling (COOL) submenu is used to change output sta-res for the individual compressors. Compressor starts are stag-gered by 15 seconds. The thns (FA_Ig) and heating (HEAl)service test outputs are reset to OFF for the cooling service test.Indoor fans and outdoor tans are controlled nonnalty to main-tain proper unit operation. All normal cooling alarms and alertsare functional.When charging unit, all outdoor thns may be tbrced on incooling service test modes by setting the Outdoor Fan Override(OEOIO to on.NOTE: Circuit A is always operated with Circuit B inHumidi-MiZer TM system equipped units.For units with the factory Humidi-MiZer option, theHumidi-MiZer (HZMR) submenu is used to change the outputstares to operate the circuits in different Humidi-MiZer modesor to separately test the Humidi-MiZer valve operations. Thetans (FANS), cooling (COOL), and heating (HEAT) semcetest outputs are reset to OFF for the Humdi-MiZer service test.Indoor and outdoor thns are controlled normally to maintainproper unit operation. All normal cooling alarms and alerts arefunctional.The heating (HEAl) submenu is used to change output sta-res for the individual heat stages, gas or electric. The thns(FANS) and cooling (COOL) smqce test outputs are reset toOFF for the heating service test. Indoor and outdoor fmls arecontrolled norlnalty to maintain proper unit operation. All nor-mal heating alarlns and alerts are functional.NOTE: Field terlninal strip terlninal R must be connected toW1 for the heat to operate in service test. Alert number T410will occur as a relninder if not done. If the normal unit controlmode is therlnostat mode, then relnove the R-W1 jumper aftercompleting service test.36