Carrier 40RFAA07 User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53400080-01 Printed in U.S.A. Form 40RF-7-12-02SI Rev. A Pg 1 2-23 Replaces: 40RU-7-16-01SI
Installation, Start-up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Moving and Storage . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Uncrating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rated Indoor Airflow (cfm) . . . . . . . . . . . . . . . . . . . . . 9
Unit Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Refrigerant Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Refrigerant and Chilled Water Piping Access . . . . 10
Chilled Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . 12
Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Fan Motors and Drives . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Power Supply and Wiring . . . . . . . . . . . . . . . . . . . . . . . 13
• THREE STAGE OPERATION
Connecting Ductwork . . . . . . . . . . . . . . . . . . . . . . . . 18
• DISCHARGE CONNECTION
• RETURN CONNECTIONS
• OUTDOOR-AIR INLET CONNECTIONS
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
40RFA and 40RFQ ONLY . . . . . . . . . . . . . . . . . . . . . 19
Adjusting TXV for Superheat 
(40RFA and 40RFQ only) . . . . . . . . . . . . . . . . . . . 19
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SUPPLY FAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Supply Fan (Direct-Drive) . . . . . . . . . . . . . . . . . . . . . 20
• EVALUATING MOTOR SPEED
• SELECTING FAN SPEED
• FAN FAULT DETECTION
• FREEZE PROTECTION
Service Access for Supply Fan and Motor . . . . . . . 22
• HORIZONTAL APPLICATIONS
• VERTICAL APPLICATIONS
Condensate Drains . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Chilled Water Coil Freeze Protection . . . . . . . . . . . 26
Coil Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cleaning Cooling Coil . . . . . . . . . . . . . . . . . . . . . . . . 26
Cleaning Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Replacing Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Quarterly Inspection 
(and 30 days after initial start) . . . . . . . . . . . . . . .27
• INDOOR SECTION
Seasonal Maintenance . . . . . . . . . . . . . . . . . . . . . . .27
• AIR CONDITIONING
FAN PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . . .28
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . .CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes, including ANSI (American National
Standards Institute) Z223.1. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguisher available for all brazing operations.
It is important to recognize safety information. This is the safety-
alert symbol . When you see this symbol on the unit and in
instructions 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.
DANGER
ELECTRICAL SHOCK HAZARD
Failure to follow this warning will result in personal injury or
death.
Before performing service or maintenance operations on unit,
turn off main power switch to unit and install lock(s) and
lockout tag(s). Ensure electrical service to rooftop unit agrees
with voltage and amperage listed on the unit rating plate. Unit
may have more than one power switch.
40RF/A/S/Q 07-12
Packaged Air-Handling Units
with Puron
®
(R-410A) Refrigerant
60 Hz

Carrier 40RFAA07 Specifications

General

Model	40RFAA07
Type	Air-Cooled Scroll Chiller
Refrigerant	R-410A
Phase	3
Compressor Type	Scroll
Voltage	400 V
Power Supply	50 Hz
Operating Ambient Temperature	-10°C to 45°C

Summary

SAFETY CONSIDERATIONS

ELECTRICAL SHOCK HAZARD

Warning about electrical shock hazard during service or maintenance operations.

PRE-INSTALLATION

MOVING AND STORAGE

Instructions for moving and storing the unit before installation.

INSTALLATION

GENERAL AND UNCRATING

General installation, uncrating, and accessory guidelines.

START-UP AND SERVICE

TXV ADJUSTMENT SUPPLY FAN

Adjusting TXV for superheat and servicing the supply fan.

SAFETY CONSIDERATIONS

REFRIGERANT AND VOLTAGE WARNINGS

Safety notes on R-410A refrigerant and fixed unit voltage.

INSTALLATION

GENERAL CLEARANCES AND UNCRATING

Required clearances, uncrating, and accessory handling procedures.

MODEL NUMBER NOMENCLATURE

DECODING UNIT MODEL NUMBERS

Explanation of the model number structure and its components.

UNIT DIMENSIONS

BASE UNIT DIMENSIONS

Detailed dimensional drawings and specifications for the base unit.

UNIT DIMENSIONS (CONT.)

UNIT WITH ECONOMIZER DIMENSIONS

Dimensional drawings for units equipped with an economizer.

PHYSICAL DATA 40RFA

DIRECT EXPANSION DATA

Specifications for 40RFA units, including weight, fan, coil, and refrigerant data.

UNIT POSITIONING AND ISOLATION

TYPICAL UNIT POSITIONING

Guidance on how to position the unit for optimal operation and drainage.

REFRIGERANT PIPING

FACTORY-INSTALLED NOZZLE DATA

Data on factory-installed nozzles and distributors for refrigerant systems.

FITTING REQUIREMENTS

PIPE FITTING SPECIFICATIONS

Details on required fittings for refrigerant and liquid line piping connections.

EVAPORATOR COIL CONNECTIONS

TYPICAL CONNECTIONS

Diagrams illustrating typical evaporator coil connections for vertical and horizontal installations.

POWER SUPPLY AND WIRING

ELECTRICAL GROUNDING AND WIRE TYPE

Importance of proper electrical grounding and using copper wire.

ELECTRICAL DATA AND NOTES

STANDARD MOTOR AND CONTACTOR DATA

Electrical specs for motors, contactors, and voltage imbalance checks.

WIRING AND SERVICE ACCESS

CONTROL BOX COMPONENTS OVERVIEW

Overview of the unit control box, including boards and terminal blocks.

UNIT WIRING DIAGRAM

FIELD AND FACTORY WIRING CONNECTIONS

Detailed diagram showing field and factory wiring connections.

THREE STAGE OPERATION

WIRING CONVERSION FOR 3-STAGE COOLING

Instructions for converting the unit to 3-stage cooling operation.

CONNECTING DUCTWORK

DUCT FLANGE INSTALLATION

How to install the discharge duct flanges for proper airflow.

START-UP CHECKS

GENERAL UNIT INSPECTION

Essential checks before starting the unit, including support and connections.

SELECTING FAN SPEED

FAN SPEED SET-UP PROCEDURE

Procedures for setting the fan speed based on CFM and ESP requirements.

FAN SPEED ADJUSTMENT

LOW SPEED 2-PIN DIP SWITCH

Adjusting low speed fan settings using DIP switches on the UCB.

SERVICE ACCESS FOR SUPPLY FAN AND MOTOR

HORIZONTAL APPLICATION ACCESS

Removing the motor and fan assembly for horizontal unit installations.

FILTER REPLACEMENT AND COIL PROTECTION

FILTER REPLACEMENT PROCEDURE

How to remove and install return-air filters for the unit.

MAINTENANCE SCHEDULE

QUARTERLY INSPECTION

Routine checks for the indoor section every quarter.

FAN PERFORMANCE DATA

GENERAL FAN PERFORMANCE NOTES

Important notes regarding fan performance data and interpolation.

FAN DATA 40RFAA07

MEDIUM STATIC FAN PERFORMANCE

RPM and VDC data for 40RFAA07 medium static fan performance.

START-UP CHECKLIST

PRELIMINARY INFORMATION

Basic identification information for outdoor and indoor units.

VOLTAGE IMBALANCE CHECK

VOLTAGE IMBALANCE CALCULATION

Procedure to calculate and verify voltage imbalance before system start.