Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53500329-01 Printed in U.S.A. Form 50PC-9SI Pg 1 8-22 Replaces: 50PC-8SIInstallation, Start-Up, andService InstructionsCONTENTSPageSAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2• INSPECTION• STORAGEINSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Step 1 — Check Jobsite . . . . . . . . . . . . . . . . . . . . . . . 2• HORIZONTAL UNITS (50PCH)• VERTICAL UNITS (50PCV)• INSTALLATION GUIDELINES (ALL UNITS)Step 2 — Check Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 3• INSPECT UNITStep 3 — Locate Unit . . . . . . . . . . . . . . . . . . . . . . . . . 7• PROTECTIONStep 4 — Mount the Unit . . . . . . . . . . . . . . . . . . . . . . . 7• DUCT FLANGES• HORIZONTAL UNITS (50PCH)• VERTICAL UNITS (50PCV)Step 5 — Check Duct System . . . . . . . . . . . . . . . . . . 8• HORIZONTAL SUPPLY AIR CONFIGURATIONCONVERSIONStep 6 — Install Condensate Drain . . . . . . . . . . . . . . 9Step 7 — Pipe Connections . . . . . . . . . . . . . . . . . . . . 9• WATER LOOP APPLICATIONS• GROUND LOOP APPLICATIONS• INSTALLING SUPPLY AND RETURN HOSE KIT• UNITS WITH WATERSIDE ECONOMIZER ORBOILERLESS HEAT CONTROL• AQUASTAT BULB INSTALLATIONStep 8 — Wire Field Power Supply . . . . . . . . . . . . . 10• HIGH VOLTAGE• OVERLOAD SETTING VERIFICATIONWire Control Connections . . . . . . . . . . . . . . . . . . . . 33• BETTER B, COMPLETE C, AND DELUXE D CONTROL• ECM INTERFACE THERMOSTAT CONNECTIONS• THERMOSTAT AND DDC SENSORS• HOT GAS REHEAT CONTROL• AUXILIARY RELAY (DELUXE D ONLY)• ENERGY MANAGEMENT SWITCH (DELUXE DONLY)• BOILERLESS HEAT CONTROL (DELUXE D ONLY)• ALARM OUTPUT (ALL UNITS)• WSHP OPEN CONTROL• CONTROL TRANSFORMERStep 9 — Configure Unit Control Components . . . 35• UNIT PROTECTION MODULE (UPM)• WATERSIDE ECONOMIZER• BOILERLESS HEAT CONTROL (DELUXE D ONLY)PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . .36• CLEAN AIR COILSet Blower Motor Speed . . . . . . . . . . . . . . . . . . . . . .37• PERMANENT SPLIT CAPACITOR (PSC) MOTOR• CONSTANT TORQUE (ECM) MOTOR• CONSTANT AIRFLOW (ECM) MOTORSystem Flushing and Filling . . . . . . . . . . . . . . . . . . .42System Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42• FLOW VERIFICATION• FLOW REGULATION• ANTIFREEZE• FREEZE PROTECTION SELECTION• START-UPOperating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . .43• ENVIRONMENT• POWER SUPPLY• UNIT STARTING CONDITIONSStart-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . .43• COOLING MODE START-UP• HEATING MODE START-UPOPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51Power Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51Unit Protection Module (UPM) . . . . . . . . . . . . . . . . .51Units with Better B, Complete C, orDeluxe D Controls . . . . . . . . . . . . . . . . . . . . . . . . . 51• STANDBY• COOLING• HOT GAS REHEAT (OPTIONAL FOR COMPLETE C ORDELUXE D CONTROLS)• WATERSIDE ECONOMIZER (OPTIONAL FORCOMPLETE C OR DELUXE D CONTROLS)• TWO WAY WATER FLOW CONTROL VALVE(OPTIONAL)• BOILERLESS HEAT (DELUXE D ONLY)• PUMP/VALVE RELAY (DELUXE D ONLY)Units with WSHP Open Controls . . . . . . . . . . . . . . .51• COOLING• REVERSE CYCLE HEATING• TWO POSITION OA DAMPER• MODULATING OA DAMPER WITH DCV• AUXILIARY MODULATING HOT WATER / STEAMHEATING REHEAT• 2-POSITION HOT WATER / STEAM HEATINGREHEAT• SINGLE STAGE ELECTRIC AUXILIARY HEAT• AUTOMATIC FAN SPEED CONTROL• FAN SPEED CONTROL - DURING HEATING• FAN SPEED CONTROL - DURING COOLING• MODULATING WATER ECONOMIZER CONTROL• 2-POSITION WATER ECONOMIZER CONTROL• POWER FAIL RESTART DELAYAquazone™50PCH, PCV 007-070Compact Water Source Heat Pumpswith Puron® Refrigerant (R-410A)