Carrier 40RFAA12 Installation, Start-Up And Service Instructions Manual

CONTENTS
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
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
Installation, Start-up and
Service Instructions
Printed in U.S.A. Form 40RF-7-12-02SI Rev. A
Packaged Air-Handling Units
with Puron
Replacing Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Page
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
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.
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.
Pg 1
40RF/A/S/Q 07-12
® (R-410A) Refrigerant
. When you see this symbol on the unit and in
DANGER
2-23 Replaces: 40RU-7-16-01SI
60 Hz