Carrier 48HG014 Controls Operation And Troubleshooting

Contents

Carrier 48HG014 Controls Operation And Troubleshooting Manual pdf 11 page image

11SPACE TEMPERATURE SENSOR (T58) — The T58 SpaceTemperature Sensor (Part No. CEPL130464-01) is a field-installed accessory. The T58 sensor communicates with theComfortLink™ controller, providing space temperature, heat-ing and cooling set points, and mode operation information.The jumper wire in the installer’s packet must be connected be-tween R and W1 when using a T58 device.SPACE TEMPERATURE SENSOR CALIBRATION —The temperature reading of the space temperature sensors canbe calibrated. Refer to the Space Temperature Sensor Calibra-tion and Trim section on page 31 for more information.ECONOMIZER — The economizer accessory (Part No.CRECOMZR009A00) is a field-installed accessory. When in-stalling this accessory, the unit must be configured for econo-mizer installation by setting EC.EQ to YES. The default settingsfor the other economizer configurations should be satisfactory.If they need to be changed, additional information about theseconfiguration settings can be found in the Economizer section.POWER EXHAUST — The power exhaust accessories(Part No. CRPWREXH018A00, CRPWREXH019A00,CRPWREXH020A00) are field-installed accessories forpower exhaust for different voltages. When installing thisaccessory, the unit must be configured for power exhaustinstallation by setting PE.EN to YES. The default settings forthe other power exhaust configurations should be satisfactory.If they need to be changed, additional information about theseconfigurations can be found in the Power Exhaust section.INDOOR AIR QUALITY — The indoor air quality (IAQ)accessory (Part No. CRCBDIOX001A00) is a field-installedaccessory. This sensor measures CO2 concentrations in the unitreturn. The defaults for IAQ configurations should be satisfac-tory; however, if they are not, additional information aboutthese configurations can be found in the Indoor Air Qualitysection.SMOKE DETECTOR — The smoke detector accessory(Part No. CRSMKDET001A00) is a field-installed accessory.This accessory detects smoke in the return duct. When install-ing this accessory, set the switch configuration to normallyopen or normally closed as wired (FS.SW). Normally closed(2) is the preferred configuration.FILTER STATUS — The filter status accessory (Part No.CRSTATUS002A00) is a field-installed accessory. This accesso-ry detects plugged filters. When installing this accessory, set theswitch configuration to normally open or normally closed aswired (FL.SW). Normally open (1) is the preferred configuration.FAN STATUS — The fan status accessory (PartNo. CRSTATUS003A00) is a field-installed accessory. Thisaccessory detects when the indoor fan is blowing air. When in-stalling this accessory, set the switch configuration to normallyopen or normally closed as wired (FN.SW). Normally open (1)is the preferred configuration.ENTHALPY SENSORS — The enthalpy accessories (PartNo. CRENTSNG001A00 or CRDENTDIF001A00) are field-installed accessories. The first accessory (outdoor air only)determines when the enthalpy is low relative to a fixed refer-ence. The second accessory (outdoor and return enthalpy aremeasured) compares the enthalpy between the outdoor andreturn airstreams. In each case, the enthalpy 4-20mA signalsare converted to a switch output which is read by the ECB.When installing this accessory, set the switch configuration tonormally open or normally closed as wired (EN.SW).Normally open (1) is the preferred configuration.CONTROLS AND FUNCTIONSMarquee Display Usage — See Fig. 7 and Tables 7-21.The display module provides the user interface to theComfortLink control system. The display has up and down ar-row keys, an key, and an key. These keysare used to navigate through the different levels of the displaystructure. See Table 7. Press the key until the dis-play is blank to move through the top 11 mode levels indicatedby LEDs on the left side of the display.When a specific item is located, the display will flash show-ing the operator the item, followed by the item value and thenfollowed by the item units (if any). Press the key tostop the display at the item value. Items in the Configurationand Service Test modes are password protected. The displaywill flash PASS and WORD when required. Use theand arrow keys to enter the 4 digits of the password. The de-fault password is 1111.Pressing the and keys simultaneouslywill scroll a clear language text description across the displayindicating the full meaning of each display acronym. Pressingthe and keys when the display is blank(Mode LED level) will return the display to its default menuof rotating display items. In addition, the password will bedisabled requiring that it be entered again before changes canbe made to password protected items.Changing item values or testing outputs is accomplished inthe same manner. Locate and display the desired item. Press thekey to stop the display at the item value. Press thekey again so that the item value flashes. Use thearrow keys to change the value or state of an item and press thekey to accept it. Press the key and theitem, value, or units display will resume. Repeat the process asrequired for other items. See Tables 7-21 for further details.Clearing Unit Alarms — The unit alarms can be clearedthrough the ComfortLink display. To check the current alarms,enter into the Alarms menu. The first submenu is the CURRsubmenu. The CURR function displays the list of currentalarms (maximum of 25). The second submenu item is theR.CUR (Reset Current Alarms) function. Press to re-set the current alarms. The next submenu item, HIST, displaysthe list of cleared alarms (maximum of 20). The HIST functioncan be cleared with the R.HIS function. See Tables 21 and 22.ECONOMIZER CALIBRATION — Because of a mechani-cal problem with the economizer, the actuator might acquire anew degree of rotation which is less than 90 degrees. If thisoccurs, a “T414 Economizer Damper Actuator Out of Calibra-tion” alert will be generated. The economizer calibration proce-dure (E.CAL under the INDP submenu) will reconfigure theactuator to the new fully closed and fully open positions. Toimplement the calibration procedure, change E.CAL from OFFto ON. E.CAL will remain ON as long as the calibration proce-dure is being implemented (as long as 5 minutes). During thecalibration procedure the actuator will close fully and thenopen fully. After the calibration is complete, the degree of rota-tion should be greater than 90 degrees, causing the T414 alarmto clear. If the T414 alert does not clear, check the economizerdamper for other mechanical problems.IMPORTANT: A T58 sensor can only be used with unitrunning Version 2.0 or higher of the unit software. If aT58 sensor is installed but will not function with the 48/50HG unit, check the unit software version with theComfortLink controls. The new version of the softwaremay need to be loaded into the unit controls.ESCAPE ENTERESCAPEENTERENTERESCAPE ENTERESCAPE ENTERENTERENTERENTER ESCAPEENTER202→