Carrier 48HE003---006 Installation Instructions Manual

Contents

51Table 39—Humidi-Mizer Adaptive Dehumidification System Sequence of Operation andSystem Response — Single Compressor Unit (48HE003--006, 48HJ004-007)THERMOSTAT INPUT ECONOMIZER FUNCTION 48HE, HJ UNIT OPERATIONH Y1 Y2 OAT. < Economizer Set Point Economizer Comp. 1 Subcooling Mode Hot Gas Reheat ModeOff — — Normal OperationOn On On No Off On Yes NoOn On Off No Off On Yes NoOn On On Yes On On Yes NoOn On Off Yes On On No YesOn Off Off No Off On No YesNOTE: On a thermostat call for W1, all cooling and dehumidification will be off.LEGENDOAT --- Outdoor Air TemperatureC06045Fig. 57 --- Propping Up Top PanelC06046Fig. 58 --- Separating Coil Sections4. Remove screws securing coil to compressor plate andcompressor access panel.5. Remove fastener holding coil sections together at returnend of condenser coil. Carefully separate the outer coilsection 3 to 4 in. from the inner coil section. (See Fig. 58.)6. Use a water hose or other suitable equipment to flushdown between the 2 coil sections to remove dirt anddebris. Clean the outer surfaces with a stiff brush in thenormal manner.7. Secure inner and outer coil rows together with afield-supplied fastener.8. Reposition the outer coil section and remove the coilcorner post from between the top panel and center post.Reinstall the coil corner post and replace all screws.condensate drainCheck and clean each year at the start of the cooling season. Inwinter, keep the drain dry or protect it against freeze-up.filtersClean or replace at the start of each heating and cooling season, ormore often if operating conditions require it. Replacement filtersmust be the same dimensions as the original filters.outdoor--air inlet screensClean the screens with steam or hot water and a mild detergent.Do not use disposable filters in place of screens.Step 2 —LubricationcompressorThe compressor is charged with the correct amount of oil at thefactory.fan motor bearingsFan motor bearings are permanently lubricated. No furtherlubrication is required. No lubrication of condenser-fan orevaporator-fan motors is required.Step 3 —Condenser--Fan AdjustmentShut off unit power supply. Remove condenser-fan assembly(grille, motor, motor cover, and fan) and loosen fan hubsetscrews. Adjust fan height as shown in Fig. 59. Tightensetscrews and replace condenser-fan assembly.UNIT FAN HEIGHT (in.) — “A”003-006 AND 007 (208/230 v) 2.75007 (460 v) 3.50C06138Fig. 59 --- Condenser--Fan AdjustmentStep 4 —EconoMi$er IV AdjustmentRefer to Optional EconoMi$er IV and EconoMi$er2 section.Step 5 —Evaporator Fan Belt InspectionCheck con-dition of evaporator belt or tension during heating andcooling inspections or as conditions require. Replace belt oradjust as necessary.Step 6 —High Pressure SwitchThe high-pressure switch contains a Schrader core depressor, andis located on the compressor hot gas line. This switch opens at428 psig and closes at 320 psig. No adjustments are necessary.48HE,HJ