Carrier 50ZP024 Installation Instructions Manual

Contents

Carrier 50ZP024 Installation Instructions Manual Manual pdf 9 page image

9ROUTING CONTROL POWER WIRES — Form a drip--loopwith the thermostat leads before routing them into the unit. Routethe thermostat leads through grommeted hole provided in unit (seeFig. 10) into unit control box. Connect thermostat leads to unitcontrol power leads as shown in Fig. 13.Route thermostat wires through grommet providing a drip--loop atthe panel. Connect low--voltage leads to the thermostat as shown inFig. 13.The unit transformer supplies 24--v power for complete system.Transformer is factory wired for 230--v operation. If supply voltageis 208 v, rewire transformer primary as described in the SpecialProcedures for 208--v Operation section below.SPECIAL PROCEDURES FOR 208--V OPERATIONELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury or death.Before performing service or maintenance operations on thesystem, turn off main power to unit and install lockout tag.! WARNING1. Remove wirenut from connection of ORG wire to BLKwire. Disconnect the ORG transformer--primary lead fromthe BLK wire. Save wirenut. See unit wiring label.2. Remove the wirenut from the terminal on the end of theRED transformer--primary lead.3. Save the wirenut.4. Connect the RED lead to the BLK wire from which theORG lead was disconnected. Insulate with wirenut fromStep 1.5. Using the wirenut removed from the RED lead, insulate theloose terminal on the ORG lead.6. Wrap the wirenuts with electrical tape so that the metalterminals cannot be seen.Indoor blower--motor speeds may need to be changed for 208--voperation. Refer to Indoor Airflow and Airflow Adjustmentssection.PRE--START--UPFIRE, EXPLOSION, ELECTRICAL SHOCKHAZARDFailure to follow this warning could result in personalinjury or death and/or property damage.1. Follow recognized safety practices and wear protectivegoggles when checking or servicing refrigerant system.2. Relieve and recover all refrigerant from system beforetouching or disturbing anything inside terminal box ifrefrigerant leak is suspected around compressorterminals.3. Never attempt to repair soldered connection whilerefrigerant system is under pressure.4. Do not use torch to remove any component. Systemcontains oil and refrigerant under pressure.5. To remove a component, wear protective goggles andproceed as follows:a. Shut off electrical power to unit and installlockout tag.b. Relieve and reclaim all refrigerant from systemusing both high-- and low--pressure ports.c. Cut component connecting tubing with tubingcutter and remove component from unit.d. Carefully unsweat remaining tubing stubs whennecessary. Oil can ignite when exposed to flame.! WARNINGUse the Start--Up Checklist supplied at the end of this book andproceed as follows to inspect and prepare the unit for initialstart--up:1. Remove all access panels.2. Read and follow instructions on all DANGER, WARNING,CAUTION, and INFORMATION labels attached to, orshipped with, unit. Make the following inspections:a. Inspect for shipping and handling damages such asbroken lines, loose parts, disconnected wires, etc.b. Inspect for oil at all refrigerant tubing connections andon unit base. Detecting oil generally indicates arefrigerant leak. Leak--test all refrigerant tubingconnections using electronic leak detector, orliquid--soap solution. If a refrigerant leak is detected, seefollowing Check for Refrigerant Leaks section.c. Inspect all field-- and factory--wiring connections. Besure that connections are completed and tight.d. Inspect coil fins. If damaged during shipping andhandling, carefully straighten fins with a fin comb.3. Verify the following conditions:a. Make sure that outdoor--fan blade is correctly positionedin fan orifice. Top edge of blade should be 3.125 in.down from condenser outlet grille. See Condenser Fansection.b. Make sure that air filter is in place.c. Make sure that condensate drain pan and trap are filledwith water to ensure proper drainage.d. Make sure that all tools and miscellaneous loose partshave been removed.50ZP