Carrier WeatherMaster Series Installation Instructions Manual

46TWO-SPEED FAN OPERATIONThe W7220 controller has the capability to work with asystem using a 2-speed supply fan. The W7220 does not con-trol the supply directly but uses the input status to determinethe speed of the supply fan (see Table 19) and controls theOA damper to the required position.Table 19 — W7220 Control, 2-Speed Supply FanThe W (heating mode) is not controlled by the W7220 but itrequires the status to know where to position the OA damper forminimum position for the fan speed.The 2-speed fan delay is available when the system is pro-grammed for 2 speed fan (in the System Setup menu item). The2-speed fan delay is defaulted to 5 minutes and can be changedin the Advanced Setup menu item. When the unit has a call forY1 In and in the free cooling mode and there is a call for Y2 In,the 2-speed fan delay starts and the OA damper will modulate100% open, and the supply fan should be set to high speed by theunit controller.After the delay one of two actions will happen:• The Y2 In call will be satisfied with the damper 100%open and fan on high speed and the call will turn off, OR• If the call for additional cooling in the space has not beensatisfied then the first stage of mechanical cooling will beenabled through Y1 Out or Y2 Out.CHECKOUTInspect all wiring connections at the economizer module’sterminals, and verify compliance with the installation wiring dia-grams.For checkout, review the Status of each configured parameterand perform the Checkout tests.NOTE: See “Interface Overview” on page 35 for informationabout menu navigation and use of the keypad.Power UpAfter the W7220 module is mounted and wired, apply power.Initial Menu DisplayOn initial start up, Honeywell displays on the first line andEconomizer W7220 on the second line. After a brief pause, therevision of the software appears on the first line and the secondline will be blank.Power Loss (Outage or Brownout)All setpoints and advanced settings are restored after anypower loss or interruption. All settings are stored in non-volatileflash memory.StatusUse the Status menu (see Table 8) to check the parameter val-ues for the various devices and sensors configured.NOTE: See “Interface Overview” on page 35 for informationabout menu navigation and use of the keypad.Checkout TestsUse the Checkout menu (see Table 8) to test the damper oper-ation and any configured outputs. Only items that are configuredare shown in the Checkout menu.NOTE: See “Interface Overview” on page 35 for informationabout menu navigation and use of the keypad.To perform a Checkout test:1. Scroll to the desired test in the Checkout menu usingthe ▲ and ▼ buttons .2. Press the (Enter) button to select the item. RUN?appears.3. Press the (Enter) button to start the test. The unitpauses, then displays IN PROGRESS. When the test iscomplete, DONE appears.4. 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 that dis-play 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 nav-igate 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 (Enter) button. ERASE? displays.3. Press the (Enter) button. ALARM ERASED dis-plays.4. Press the (Menu up/Exit) button to complete theaction and return to the previous menu.NOTE: If the alarm still exists after clearing it, it is redisplayedwithin 5 seconds.STATE FAN SPEEDOCC LowY1 LowY2 HighW HighWARNINGELECTRICAL SHOCK HAZARDFailure to follow this warning could cause personal injury ordeath.Before performing service or maintenance operations onunit, turn off main power switch to unit and install lock(s)and lockout tag(s). Ensure electrical service to rooftop unitagrees with voltage and amperage listed on the unit ratingplate. Unit may have more than one power switch.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 shut down between checkout tests so that youdo not short-cycle the compressors.