Carrier 48AJ Operating And Service Manual

Also see for 48AJ: Installation, Start-Up and Service Instructions Installation instructions Operation and service guide Started guide

38Table 45 — SetpointsTable 46 — Supply Air Reset ConfigurationTable 47 — Cooling ConfigurationCapacity Threshold Adjust (Z.GN) — This configuration isused for units using the “SumZ” algorithm for cooling capacitycontrol (Configuration→UNIT→C.TYP = 1, 2, 3 or 5). Theconfiguration affects the cycling rate of the cooling stages byraising or lowering the threshold that demand must build to inorder to add or subtract a stage of cooling.Normally this configuration should not require any tuning oradjustment. If there is an application where the unit may be sig-nificantly oversized and there are indications of high compres-sor cycles then the Capacity Threshold Adjust (Z.GN) can beused to adjust the overall logic gain. Normally this is set to 1.0,but it can be adjusted from 0.5 to 4.0. As the value of Z.GN isincreased, the cycling of cooling stages will be slowed.Compressor Lockout Temperature (MC.LO) — This config-uration is the outdoor air temperature setting below whichmechanical cooling is locked out.Fan-Off Delay, Mech Cool (C.FOD) — After a mechanicalcooling cycle has ended, this is the delay in seconds that thesupply fan will continue to operate.Min. Load Valve (HGBP)? (MLV) — This configuration in-structs the control as to whether a minimum load valve hasbeen installed and will be controlled by the compressor stagingroutine.MotorMaster Control? (M.M.) — The condenser fan stagingcontrol for the unit is managed directly by the ComfortLink™control. There is no physical Motormaster® device in thestandard unit. The standard unit is capable of mechanicalcooling operation down to 35 F outdoor temperature. With theaddition of accessory Motormaster V speed control on the stage1 condenser fan(s), mechanical cooling operation down to 0° Foutdoor temperature is possible. The accessory Motormaster Vspeed control is a completely self-contained control and is notcontrolled by the unit’s ComfortLink control. The Motormastercontrol configuration (M.M.) only applies to the 060 size units.On 060 size units with accessory Motormaster V speed controlinstalled, this configuration must be set to YES. On 060 sizeunits without accessory Motormaster V speed control installedand on all 020-050 size units, this configuration must be set toNO. On 051 and 060 size units with this configuration set toNO, the ComfortLink control will control 3 stages of condenserfan head pressure control. With this configuration set to YES,the ComfortLink control will control 2 stages of condenser fanhead pressure control in addition to the Motormaster V speedcontrol accessory. See Head Pressure Control section, page 46,for more information.Head Pressure Set Point (HPSP) — This is the head pressureset point used by the ComfortLink control during condenserfan, head pressure control.Enable Compressor A1 (A1.EN) — This configuration isused to disable the A1 compressor in case of failure.Enable Compressor A2 (A2.EN) — This configuration isused to disable the A2 compressor in case of failure.Enable Compressor B1 (B1.EN) — This configuration isused to disable the B1 compressor in case of failure.Enable Compressor B2 (B2.EN) — This configuration isused to disable the B2 compressor in case of failure.CSB A1 Feedback Alarm (CS.A1) — This configuration isused to enable or disable the compressor A1 feedback alarm.This configuration must be enabled at all times.CSB A2 Feedback Alarm (CS.A2) — This configuration isused to enable or disable the compressor A2 feedback alarm.This configuration must be enabled at all times.CSB B1 Feedback Alarm (CS.B1) — This configuration isused to enable or disable the compressor B1 feedback alarm.This configuration must be enabled at all times.CSB B2 Feedback Alarm (CS.B2) — This configuration isused to enable or disable the compressor B2 feedback alarm.This configuration must be enabled at all times.ITEM EXPANSION RANGE UNITS CCN POINT DEFAULTOHSP Occupied Heat Setpoint 40-99 dF OHSP 68OCSP Occupied Cool Setpoint 40-99 dF OCSP 75UHSP Unoccupied Heat Setpoint 40-99 dF UHSP 55UCSP Unoccupied Cool Setpoint 40-99 dF UCSP 90GAP Heat-Cool Setpoint Gap 2-10 deltaF HCSP_GAP 5V.C.ON VAV Occ. Cool On Delta 0-25 deltaF VAVOCON 3.5V.C.OF VAV Occ. Cool Off Delta 1-25 deltaF VAVOCOFF 2SASP Supply Air Setpoint 45-75 dF SASP 55SA.HI Supply Air Setpoint Hi 45-75 dF SASP_HI 55SA.LO Supply Air Setpoint Lo 45-75 dF SASP_LO 60SA.HT Heating Supply Air Setpt 90-145 dF SASPHEAT 85T.PRG Tempering Purge SASP –20-80 dF TEMPPURG 50T.CL Tempering in Cool SASP 5-75 dF TEMPCOOL 5T.V.OC Tempering Vent Occ SASP –20-80 dF TEMPVOCC 65T.V.UN Tempering Vent Unocc. SASP –20-80 dF TEMPVUNC 50ITEM EXPANSION RANGE UNITS CCN POINT DEFAULTEDT.R EVAP.DISCHRGE TEMP RESETRS.CF EDT Reset Configuration 0 - 3 EDRSTCFG 0RTIO Reset Ratio 0 - 10 RTIO 2LIMT Reset Limit 0 - 20 deltaF LIMT 10RES.S EDT 4-20 ma Reset Input Enable/Disable EDTRSENS DisableITEM EXPANSION RANGE UNITS CCN POINT DEFAULTCOOL COOLING CONFIGURATIONZ.GN Capacity Threshold Adjst –10 - 10 Z_GAIN 1MC.LO Compressor Lockout Temp –20 - 55 dF OATLCOMP 40C.FOD Fan-Off Delay, Mech Cool 0-600 sec COOL_FOD 60MLV Min. Load Valve (HGBP)? Yes/No MLV_SEL NoM.M. Motor Master Control ? Yes/No MOTRMAST NoHPSP Head Pressure Setpoint 80 - 150 dF HPSP 113A1.EN Enable Compressor A1 Enable/Disable CMPA1ENA EnableA2.EN Enable Compressor A2 Enable/Disable CMPA2ENA EnableB1.EN Enable Compressor B1 Enable/Disable CMPB1ENA EnableB2.EN Enable Compressor B2 Enable/Disable CMPB2ENA EnableCS.A1 CSB A1 Feedback Alarm Enable/Disable CSB_A1EN EnableCS.A2 CSB A2 Feedback Alarm Enable/Disable CSB_A2EN EnableCS.B1 CSB B1 Feedback Alarm Enable/Disable CSB_B1EN EnableCS.B2 CSB B2 Feedback Alarm Enable/Disable CSB_B2EN EnableREV.R Rev. Rotation Verified? Yes/No REVR_VER NoH.SST Hi SST Alert Delay Time 5 - 30 min HSSTTIME 10