Carrier 48TC 07 Installation, Start-Up And Service Instructions Manual

Installation, Start-Up and Service Instructions
This document provides supplemental installation, setup and troubleshooting information for the
Variable Frequency Drive (VFD) factory-installed option. It is to be used with the base unit Installation
Instructions for 48/50TC, 50TCQ, 48/50HC, 50HCQ, and 40RU 2-Stage cooling units with a VFD fan
speed relay board, sizes 07-30. Units equipped with the VFD are identified by an indicator in the unit's
model number (see the unit's nameplate). Use Table 1 to identify whether a given unit is equipped with
the factory-installed VFD option.
NOTE: Read the entire instruction manual before starting the
installation.
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Staged Air Volume (SAV™) 
Indoor Fan Speed System . . . . . . . . . . . . . . . . . . . 2
Identifying Factory Option . . . . . . . . . . . . . . . . . . . . . 2
Unit Installation with SAV Option . . . . . . . . . . . . . . . 3
Pre-Start Check, SAV™ Option . . . . . . . . . . . . . . . . . 5
START-UP, SAV™ OPTION . . . . . . . . . . . . . . . . . . . 16
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . 16
Indoor Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Cooling with SAV . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operating Sequences, SAV Option . . . . . . . . . . . . . 16
Cooling (FAN Switch in AUTO) . . . . . . . . . . . . . . . . 16
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operating Fan for Test and Balance . . . . . . . . . . . . 17
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SAV™ Option Components . . . . . . . . . . . . . . . . . . . 18
Fan Speed Relay Board . . . . . . . . . . . . . . . . . . . . . . 18
Configuration Jumpers . . . . . . . . . . . . . . . . . . . . . . . 18
Variable Frequency Drive . . . . . . . . . . . . . . . . . . . . . 18
Central Terminal Board Jumpers 
(48/50 Series Only) . . . . . . . . . . . . . . . . . . . . . . . . 20
VFD Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Control and Power Wiring Diagrams . . . . . . . . . . . . 22
VFD ALARMS AND FAULTS TROUBLESHOOTING . 29
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
VFD MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . 30
Heat Sink Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fan Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Bypass the VFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
VFD PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . 35
ACH550/580 VFD Common Parameters for 48/50 Units
with I/O Flex Controls . . . . . . . . . . . . . . . . . . . . . . 55
VFD REMOTE KEYPAD . . . . . . . . . . . . . . . . . . . . . . . 63
ACH550/ACS320 Operation with Remote Keypad . 63
ACH550/ACS320 VFD Modes . . . . . . . . . . . . . . . . . . 63
ACH550/ACS320 VFD Diagnostics . . . . . . . . . . . . . 65
Correcting Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480483-01
Page
Printed in U.S.A. Form No. VFD-12SI
Variable Frequency Drive (VFD)
Factory-Installed Option
2-Speed Motor Control
for 2-Stage Cooling Rooftop Units
History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Reset After Using Start-Up Assistant . . . . . . . . . . .68
ACH580 Operation with Remote Keypad . . . . . . . .69
ACH580 VFD Modes . . . . . . . . . . . . . . . . . . . . . . . . .70
ACH580 VFD Diagnostics . . . . . . . . . . . . . . . . . . . . .72
ALL ACH580, ACH550 AND ACH320 KEYPADS . . .75
Control Panel Cleaning . . . . . . . . . . . . . . . . . . . . . . .75
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . .75
VFD Remote Keypad Parameters . . . . . . . . . . . . . . .75

SAFETY CONSIDERATIONS

CAUTION
CONFIGURATION OVERRIDE HAZARD
Do not use ABB or Carrier start-up assistant on this VFD
application. Use of start-up assistant will override the factory
VFD configurations.
Improper installation, adjustment, alteration, service, mainte-
nance, or use can cause explosion, fire, electrical shock or other
conditions which may cause personal injury or property damage.
Consult a qualified installer, service agency, or your distributor or
branch for information or assistance. The qualified installer or
agency must use factory-authorized kits or accessories when mod-
ifying this product. Refer to the individual instructions packaged
with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloths for brazing operations and have a fire extin-
guisher available. Read these instructions thoroughly and follow
all warnings or cautions attached to the unit. Consult local build-
ing codes and appropriate national electrical codes (in USA,
ANSI/NFPA70, National Electrical Code (NEC); in Canada,
CSA C22.1) for special requirements.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in in-
structions or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices, which may result in minor personal
injury or product and property damage.
NOTE is used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
Pg 1 1-24 Replaces: VFD-11SI