Bard MULTI-TEC W18AAPA Service Instructions Manual

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Bard MULTI-TEC W18AAPA Service Instructions Manual Manual pdf 13 page image

Manual 2100-665DPage 13 of 26NOTE: Screenshots shown in this manual reflectdefault settings (when applicable).On/Off ControlThe wall-mount unit can be turned on and off with theTEC-EYE. When the unit is set to ON, the system willheat and cool the space either in standalone mode orwhen connected to the LC. When the unit is set to OFF,the unit will not heat or cool the space.To turn the unit on or off:1. Press MENU key to go to the Main Menu screen.2. Press UP or DOWN keys and ENTER key to enterUSER password 2000.3. Press UP or DOWN keys to scroll to ON/OFF; pressENTER key.4. Press UP or DOWN key to change the system fromOFF to ON or from ON to OFF.5. Press ESCAPE key until Main Menu screen isdisplayed.Fan ControlThe blower will be in continuous operation in standalone mode. To operate the blower continuously whilecommunicating with the LC6000 or th-TUNE singleunit controller, refer to the latest version of the2100-669 LC6000 Service Instructions manual or2100-678 th-TUNE manual.CONTROL OPERATIONTemperature ControlWhen the unit is connected to the LC controller, itwill receive all of its heating, cooling and ventilationcommands from the controller.When the unit is in stand alone operation, it willheat, cool and ventilate based on the return airtemperature measurement. The return air temperaturewill be compared to the cooling setpoint. Basedon differentials above and below the setpoint, theavailable cooling and heating stages will be utilized.Cooling Sequence – Economizer Available(see Figure 14)If the return air temperature is higher than 79°F(Setpoint + Stage 1 Diff On) and outdoor conditions areacceptable for economizing, the unit will enable theeconomizer. If the return air temperature is higher than80°F (Setpoint + Stage 2 Diff On), the unit will enablemechanical cooling stage 1. If the control value ishigher than 81°F (Setpoint + Stage 3 Diff On), the unitwill enable mechanical cooling stage 2.Cooling Sequence – Economizer Not Available(see Figure 14)If the return air temperature is higher than 79°F(Setpoint + Stage 1 Diff On), the unit will enable stage1 mechanical cooling. If the return air temperature ishigher than 80°F (Setpoint + Stage 2 Diff On), the unitwill enable stage 2 mechanical cooling.FIGURE 14MULTI-TEC Wall-Mount Unit Cooling StagingStage 1 Diff OnStage 2Stage 174 75 76 77 78 79 80 81 82 83Off Band On72 73Stage 1 Diff OffStage 2 Diff OffStage 3 Stage 3 Diff OffStage 3 Diff OnStage 2 Diff OnSetpoint