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 82 page image

Field-Installed AccessoriesSPACE TEMPERATURE SENSOR (T-55) The T-55 spacetemperature sensor (part no. 33ZCT55SPT) is a field-installedaccessory. The sensor is installed on a building interior walt tomeasure room air temperature. The T-55 sensor also includes anoverride button on the fiont cover to permit occupants to over-ride the Unoccupied Schedule (if progralrnned). The jumperwire in the instalter's packet must be connected between R andW1 when using a T-55 device. See Fig. 30 and 31.SPACE TEMPERATURE SENSOR (1-56) The T-56 spacetemperature sensor (part no. 33ZCT56SPT) is a field-installedaccessory. This sensor includes a sliding scale on the fiontcover that permits an occupant to adjust the space temperatureset point remotely. The T-56 sensor also includes an overridebutton on the front cover to allow occupants to override theunoccupied schedule (if progalrnned). The jumper wire in theinstaller's packet must be connected between R and Wl whenusing a T-56 device. See Fig. 30 and 32.SPACE TEMPERATURE SENSOR (T-58) The T-58space temperature sensor (part no. 33ZCT58SPT) is a field-in-stalled accessory. The T-58 sensor colrnnunicates with theComJbrtLink TM controtlei; providing space temperature, heat-ing and cooling set points, and mode operation inlbnnation.The jumper wire in the installer's packet must be connectedbetween R and W1 when using a T-58 device. See Fig. 33.REIN"to the T-58 installation instructions for information oninstalling and configuring the T-58 sensor.Each T-58 sensor must have a unique address on the CCN.Each T-58 sensor must also be confi_red with the address ofthe unit control it is communicating to.SPACE TEMPERATURE SENSOR AVERAGING SeeFig. 34 for space temperature averaging with T-55 sensors only.If the use of one T-56 sensor is required, refer to Fig. 35.ECONOMIZER The economizer accessory usage de-pends on model size. When installing this accessory, the unitmust be configured for economizer installation by setting(bnfgmvttion--->ECON--->ECEN to YES. The dethult settingsfor the other economizer confi_rations should be satislhctory.If they need to be changed, additional information about theseconfiguration settings can be tbund in the Economizer section.POWER EXHAUST The power exhaust accessory usagedepends on voltage. When installing this accessory, the unitmust be configured for power exhaust installation by setting(bnfigutvttion-->ECON-->PE.EN to ENBL. The default set-tings for the other power exhaust configurations should besatisihctory. If they need to be changed, additional inibnnationabout these configurations can be found in the Power Exhaustsection.TWO-POSITION DAMPER This accessory wires direct-ly into the low voltage circuit tbr the indoor fan control. Noother control configuration is needed.INDOOR AIR QUALITY The indoor air quality ([AQ)sensor is a field-installed accessory which measures CO2 levels inthe air. When installing this sensor, the unit must be configured tbrIAQ use by setting Configuralion--_AIR.O--dA.CF to a valueof 1, 2, or 3. See the Indoor Air Quality section lbr moreinformation.OUTDOOR AIR QUALITY The outdoor air quality(OAQ) sensor (part no. 33ZCSENCO2) is a field-installed acces-sory that measures CO2 levels in the air. When installing thissensor, the unit must be configured lbr OAQ use by settingConfiguration--->AIR.O_OA.CF to a value of 1 or 2. See theIndoor Air Quality section lbr more inlbnnation.SMOKE DETECTORS The Slnoke detectors are field-installed accessories. These detectors can detect smoke ineither the return air (part no. CRSMKDET001D00) or supplyand return air (part no. CRSMKSUP001B00). When installingeither detectoi; the unit must be configured for tire shutdo,am bysetting Configuration-->UNIr-->FS.SW to normally open (1)or nonnalty closed (2).NOTE: When a Humidi-Mizer TM system is installed, theinputs to the fire shutdown are moved to the control harness.See the Third Party Control section on page 38 for moreinformation.FILTER STATUS The filter status accessory (part no.CRSTATUS003B00) is a field-installed accessory. This accesso-ry detects plugged filters. When installing this accessory, the unitmust be configuzed for filter status by setting (bnfiguration---_UNIT---_FL.SWto normally open (1) or normally closed (2).Normally open (1) is the preferred configuration.FAN STATUS The thn status accessory (part no.CRSTATUS003B00) is a field-installed accessory. This acces-sory detects when the indoor flax1is blowing air. When installingthis accessory, the unit must be configured tbr fan status bysetting Configuration--+UNIT---_FPc:SW to m_nally open (1)or nonnalty closed (2). Nonnatly open (1) is the preferredconfiguration.ENTHALPY SENSORS The enthalpy accessories (partno. CRENTSNG02A00 and CRENTDIF02A00) are field-installed accessories. The first accessory (outdoor air only)determines when the enthatpy is low relative to a fixed refer-ence. Adding the second accessory (return air) compares theenthalpy between the outdoor and return airstreams. In eachcase, the enthalpy 4 to 20 mA simmls are converted to a switchoutput which is read by the ECB. When installing this accesso-ry, the unit must be configured for enthalpy-based control bysetting (bnfiguration -->E(DN--_EPC:SWto nonnalty open ( 1).See Fig. 14-19 for wiring details.RETURN/SUPPLY AIR TEMPERATURE SENSOR Thetemperature sensor (part no. 33ZCSENSAT) is a field-installedaccessory which may be installed on the common return airduct and/or the COlnmon supply air duct near the unit. The ductremm air temperature (RAT) may be selected for display onlyif the space temperature ofl;et (SPTO) is not used. When in-stalling the sensor, the unit must be confimlred by settingConfiguration--+UNIT--+RAT.S to YES. The duct supply airtemperature (SAT) may be used to replace the SAT sensor thatis intemat to the unit. A supply duct SAT measurement is validfor heating mode display while the thctory-standard internalSAT is not valid for heating clue to its location upstremn of theheating section. When installing the supply duct SAT, the unitmust be confimlred by setting Configuration-+UNIT---_gAT.Hto ENBL. A SAT sensor in the supply duct is the preferred con-figuxation for systems with Carrier VVT,_R)controls.SPACE HUMIDITY SENSOR The space relative humidi-ty sensor (part no. HL39ZZ005 duct mount or HL39ZZ007walt mount) is a field-installed accessory. The space relativehumidity (RHS) may be selected for display only if the outdoorair quality sensor (OAQ) is not used. When installing the rela-tive humidity sensor, the unit must be configured by settingCot*figuration --_UNIT--_RIt.S to YES.ELECTRIC HEAT The electric heat accessory depends onmodel size, voltage, and heater kW size. When field installingthis accessory, the unit must be confimlred for electric heat bysetting Configuration-+HEAT--->HT.. TY to a value of 2.82