Transcription
SERVICE AND MAINTENANCE INSTRUCTIONSVERTICAL/HORIZONTAL/MULTI POSITION FAN COIL UNITSFEM4, FCM4, FSA4, FEA4, FSM4, FSU4, FXM4, FVM4, FMA4,WAH, WAP, WAM, WAX, REM4NOTE: Read the entire instruction manual before starting theinstallation.TABLE OF CONTENTSPAGESAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1FAN COIL DESCRIPTION ANDTROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2FSM4, FSU4, FSA4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2FEM4P, FEM4X, FEA4X, FXM4, WAHA, WAPM, WAPT,WAPL, WAHM, WAHT, WAHL, WAXM, WAXT, WAXL,REM4P, REM4X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5FVM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6FCM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12FMA4P, WAMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17FMA4X, WAXA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17ELECTRIC HEATER FUNCTION ANDTROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 22FEM4, FCM4, FSA4, FEA4, FXM4, FVM4, WAPM,WAPT, WAPL, WAHM, WAHT, WAHL, WAXM, WAXT,WAXL, REM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22FMA4, WAMA, WAXA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 23FEM4, FCM4, FXM4, FVM4, WAP, WAH,WAX, REM4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23FSA4, FEA4, FMA4, WAMA, WAXA . . . . . . . . . . . . . . . . 24REFRIGERANT FLOW CONTROL DEVICES . . . . . . . 25THERMOSTATIC EXPANSION VALVES (TXV) . . . . . . 25PISTON BODY CLEANING AND REPLACEMENT . . . 26COIL & CONDENSATE PAN REMOVAL ANDREPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27R 410A QUICK REFERENCE GUIDE . . . . . . . . . . . . . . 30Recognize safety information. This is the safety alert symbol. When you see this symbol on the unit and in instructionmanuals, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING, andCAUTION. These words are used with the safety alertsymbol. DANGER identifies the most serious hazards whichwill result in severe personal injury or death. WARNINGsignifies hazards which could result in personal injury ordeath. CAUTION is used to identify unsafe practices whichmay result in minor personal injury or product and propertydamage. NOTE is used to highlight suggestions which willresult in enhanced installation, reliability, or operation.!CAUTIONUNIT OPERATION AND SAFETY HAZARDFailure to follow this caution may result in equipmentdamage, improper operation or personal injury.When coils are pressurized with nitrogen, open thesuction port first to release the nitrogen. Mesh screensmay dislodge if the liquid line is opened first.!WARNINGUNIT OPERATION AND SAFERTY HAZARDFailure to follow this warning could result in personalinjury or death.R 410A systems operate at higher pressures than R 22systems. Do not use R 22 service equipment orcomponents on R 410 equipment. Ensure serviceequipment is rated for R 410A.INTRODUCTIONSAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock, or other conditions which may cause death, personalinjury or property damage. Consult a qualified installer, serviceagency, or your distributor or branch for information orassistance. The qualified installer or agency must usefactory authorized kits or accessories when modifying thisproduct. Refer to the individual instructions packaged with kitsor accessories when installing.Follow all safety codes. Wear safety glasses, protectiveclothing and work gloves. Have a fire extinguisher available.Read these instructions thoroughly and follow all warnings orcautions included in literature a
sequence SEQ is energized which closes contacts of relay. There will be a time delay. This completed circuit energizes all heating elements HTR and blower motor. B. Heat Pump COOLING On a call for cooling, the thermostat makes circuits R O, R Y, and R G. Circuit R O energizes reversing valve, switching it to cooling position.
