Carrier WeatherMaster 50HC14 Installation Instructions Manual

Also see for WeatherMaster 50HC14: Service and maintenance instructions Service and maintenance instructions Installation instructions

Contents

38Power UpAfter the W7220 module is mounted and wired, applypower.Initial Menu DisplayOn initial start up, Honeywell displays on the first lineand economizer W7220 on the second line. After a briefpause, the revision of the software appears on the first lineand the second line will be blank.Power Loss (Outage or Brownout)All setpoints and advanced settings are restored after anypower loss or interruption.NOTE: All settings are stored in non-volatile flash memory.StatusUse the Status menu (see Table 8) to check the parametervalues for the various devices and sensors configured.NOTE: For information about menu navigation and use of thekeypad, see Interface Overview on page 27.Checkout TestsUse the Checkout menu (on page 32) to test the damperoperation and any configured outputs. Only items that areconfigured are shown in the Checkout menu.NOTE: For information about menu navigation and use of thekeypad, see Interface Overview on page 27.To perform a Checkout test:1. Scroll to the desired test in the Checkout menu using the▲ and ▼ buttons.2. Press the button to select the item.3. RUN? appears.4. Press the button to start the test.5. The unit pauses and then displays IN PROGRESS.6. When the test is complete, DONE appears.7. When all desired parameters have been tested, press the(Menu Up) button to end the test.The Checkout tests can all be performed at the time of in-stallation or at any time during the operation of the system asa test that the system is operable.TROUBLESHOOTINGAlarmsThe economizer module provides alarm messages thatdisplay on the 2-line LCD.NOTE: Upon power up, the module waits 60 minutes beforechecking for alarms. This allows time for all the configured de-vices (e.g. sensors, actuator) to become operational. The excep-tion is the SAT sensor, which will alarm immediately.If one or more alarms are present and there has been nokeypad activity for at least 5 minutes, the Alarms menu dis-plays and cycles through the active alarms.You can also navigate to the Alarms menu at any time.Clearing AlarmsOnce the alarm has been identified and the cause has beenremoved (e.g. replaced faulty sensor) the alarm can becleared from the display.To clear an alarm, perform the following:1. Navigate to the desired alarm.2. Press the button.3. ERASE? displays.4. Press the button.5. ALARM ERASED displays.6. Press the (Menu up/Exit) button to complete theaction and return to the previous menu.NOTE: If the alarm still exists after you clear it, it is redisplayedwithin 5 seconds.Low Ambient Control (Factory Option)If the unit comes with Electro-Mechanical (EM) control,then no adjustment is necessary.If the unit comes with PremierLink™ or RTU Open con-trol option, then refer to its installation control manual for de-tails on adjusting “Cooling Lock-Out” setting and configurefor your specific job requirements.Staged Air Volume (SAV™) with Variable Fre-quency Drive (Factory Option)For details on operating 50HC 2 stage cooling unitsequipped with the factory-installed Staged Air Volume op-tion, refer to the Variable Frequency Drive (VFD) Installa-tion, Start-Up and Service Instructions.ComfortLink Controls (Factory Option)For details on operating 50HC units equipped with the fac-tory-installed ComfortLink controls option, refer to Controls,Start-Up, Operation and Troubleshooting for 48/50HC 04-28Single Package Rooftop Unit with ComfortLink Controls.WARNINGFailure to follow this warning could result in personal injury,property damage, or death.Before performing service or maintenance operations onunit, always turn off main power switch to unit and installlock(s) and lockout tag(s). Unit may have more than onepower switch. Ensure electrical service to rooftop unit agreeswith voltage an amperage listed on the unit rating plate.If any wiring changes are required, first be sure to removepower from the Economizer module before starting work.Pay particular attention to verifying the power connection(24 vac).CAUTIONFailure to follow this caution may result in damage toequipment. Be sure to allow enough time for compressorstart-up and shutdown between checkout tests so that youdo not short-cycle the compressors.