Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting

Also see for 48LC 05: Controls, Start-Up, Operation and Troubleshooting Service and maintenance instructions Service and maintenance instructions

Contents

Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting Manual pdf 38 page image

38Humidi--MiZerR System TroubleshootingUse the SystemVut control display or a CCN device to view thecooling status display and the cooling diagnostic display. SeeOptional Humidi--MiZer Dehumidification System starting onpage 19 for information on the cooling operation and the relatedHumidi--MiZer system operation. Check the current alarms andalarm history for any cooling alarm codes and correct any causes(see Table 13 on page 34). Verify any unique controlconfigurations per installed site requirements or accessories.If alarm conditions are corrected and cleared, operation of thecompressors, fans, and Humidi-MiZer system valves may beverified by using the Service Test mode (see Table 4 on page 11).In addition to general cooling service analysis (Table 15 on page37), see Table 16 (on page 39) for general Humidi-MiZer systemservice analysis.NOTE: Wiring, operation, and charge are different on aHumidi-MiZer system unit compared to a standard unit.Activating Humidi--MiZer System Operation AfterField Replacement of a SystemVut ControllerHumidi--MiZer system operation is enabled as part of the factoryconfiguration of the unit. When field replacement of a SystemVucontroller is required, the replacement controller must befield--configured to control the Humidi--MiZer system option.Field activation of the Humidi--MiZer system requires use ofNetwork System Tool Five and either i--VuR 6.5 software or i--VuTools 6.5 (field assistant tool).NOTE: The i--Vu software or i--Vu Tools must be version 6.5 orlater. Earlier versions do not support the SystemVu controller.Connect the computer with the required software to the installedreplacement SystemVu controller. Using Network System ToolFive, navigate to the Properties screen (see Fig. 22). Enter theSerial number from the unit nameplate into the Serial number field.a48--- 9930Fig. 22 -- Network System Tools Five Properties PageNext launch either the i--Vu 6.5 software or the i--Vu Tools 6.5field assistant and navigate to the Properties page (see Fig. 23). Goto the Service section and locate HUMIDI--MIZER. Set thefollowing selections to Yes: Humidimizer En Status, Liquid DischgValve CirA Enable, and Reheat Dischg Valve CirA Enable.a48--- 9940Fig. 23 -- i--Vu Properties Page -- Service Section