Carrier 38MVC, 38MVQ, 40MVC, 40MVQ

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

Catalog No.38---40MV---1SM

Replaces: New

Printed in U.S.A. Edition Date: 03/08

38/40MVC, MVQ

Contents

Main Service Manual SAFETY CONSIDERATIONS !WARNING INTRODUCTION MODEL NUMBER NOMENCLATURE OUTDOOR UNIT INDOOR UNIT SERIAL NUMBER NOMENCLATURE STANDARD FEATURES AND ACCESSORIES INDOOR UNITS 38/40MVC, MVQ OUTDOOR UNITS LOW AMBIENT KIT CRANKCASE HEATER SPECIFICATIONS -- COOLING ONLY UNITS 38/40MVC, MVQ SPECIFICATIONS -- HEAT PUMP UNITS DIMENSIONS -- INDOOR DIMENSIONS -- OUTDOOR H W L1 CLEARANCES -- INDOOR CLEARANCES -- OUTDOOR SYSTEM OPERATING ENVELOPE 38/40MVC, MVQ 53MVC/MVQ System Operating Envelope Chart Cooling Continuous Operation Heating Continuous Operation CONNECTION DIAGRAMS Page Page Page Page Page Page Page REFRIGERATION CYCLE DIAGRAM REFRIGERANT LINES SYSTEM EVACUATION AND CHARGING CAUTION t ! SYSTEM VACUUM AND CHARGE Outdoor Unit Indoor Uni CONTROL SYSTEM SYSTEM SAFETIES 3MINUTETIMEDELAY COMPRESSOR OVERCURRENT PROTECTION S S S S SEQUENCE OF OPERATION Interface MODES OF OPERATION Page Page TROUBLESHOOTING DIAGNOSTIC HIERARCHY CHART 1 -- INDOOR FAN SPEED OUT OF CONTROL CHART 2 -- TEMPERATURE SENSOR CHART 3 -- COMPRESSOR OVERCURRENT PROTECTION CHART 4 -- INDOOR UNIT COMMUNICATION ERROR SIZE 9K AND 12K CHART 5 -- OUTDOOR UNIT PROTECTS * CHART 6 -- INDOOR UNIT COMMUNICATION ERROR SIZE 18K AND 24K CHART 7 -- UNIT NOT RUNNING, NO DIAGNOSTIC CODE CHART 8 -- UNIT NOT RUNNING OPTIMALLY CHART 9 -- UNIT NOT RUNNING OPTIMALLY (HP IN HEATING)* CHART 10 -- COMPRESSOR CHART 11 -- OUTDOOR MOTOR CHART 12 -- REVERSING VALVE CHART 13 -- RECEIVER BOARD APPENDIX 38/40MVC, MVQ A 1 -- 5 3 M V C 0 0 9 -- -- -- 1 / 5 3 M V C 0 1 2 -- -- -- 1 A 2 -- 5 3 M V Q 0 0 9 -- -- -- 1 / 5 3 M V Q 0 1 2 -- -- -- 1 A 3 -- 5 3 M V C 0 1 2 -- -- -- 3 38/40MVC, MVQ A 4 -- 5 3 M V Q 0 1 2 -- -- -- 3 A 5 -- 5 3 M V C 0 1 8 -- -- -- 3 A6 -- Characteristics of Temperature Sensor A7 -- Fuse Chart A8 -- Indoor Unit Diagnostic Guides 9K & 12K Units 18K & 24K Units Fig. 34 LED Display Panel