Carrier 50SZ Series Installation, Start-up And Service Instructions Manual

Also see for 50SZ Series: Manual Product data

Contents

Unit 50SZ three-speed motors are factory wired for low speedoperation. Unit 50SZ 030 is factory wired for medium speed. Unit50SZ 018 has a two-speed motor wired for low speed.For 208/230-v Motors:— The motor leads are color-coded (SeeTable 4).Table 4—Color Coding for 208/230–V Motor LeadsBLACK = HIGH SPEEDBlue = Medium SpeedRed = Low SpeedTo change the speed of the indoor fan motor (IFM), remove fanmotor speed lead from the Time Delay Relay (TDR) and replacewith the lead for the desired blower motor speed. The motor speedlead is attached to terminal TDR-3. For low and medium speeds,black must be connected to the jumper wire. Insulate removed leadend to avoid contact with chassis parts.MAINTENANCETo ensure continuing high performance, and to minimize thepossibility of premature equipment failure, periodic maintenancemust be performed on this equipment. This heat pump unit shouldbe inspected at least once each year by a qualified service person.To troubleshoot unit, refer to Table 11.NOTE TO EQUIPMENT OWNER: Consult your local dealerabout the availability of a maintenance contract.FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injury,death, or property damage.The ability to properly perform maintenance on this equip-ment requires certain expertise, mechanical skills, tools andequipment. If you do not possess these, do not attempt toperform any maintenance on this equipment, other than thoseprocedures recommended in the User’s Manual.FIRE, EXPLOSION, ELECTRICAL SHOCK CUT HAZ-ARDFailure to follow these warnings could result in serious injuryor death:1. Turn off electrical power to the unit and install lockout tagbefore performing any maintenance or service on this unit.2. Use extreme caution when removing panels and parts. Aswith any mechanical equipment, personal injury can resultfrom sharp edges.3. Never place anything combustible either on, or in contactwith, the unit.Fig. 19—50SZ Balance Point WorksheetC00093Balance Point Worksheet010203040506070-10 0 10 17 20 30 40 47 50 60Outdoor Air Temp (Deg F)024030036042048060Based on Indoor Entering Air of 70 F and Rated CFMBuilding Heat Loss, 1000BTUHUnit Integrated Heating Capacity (x1000BTUH)14