Carrier 48HJ004---007 installation instructions Safety Considerations, Installation Instructions

48HJ004---007 48HE003---006

Single---Package Rooftop Heating/Cooling Standard and Low NOx Units

Installation Instructions

CONTENTS
	Page
SAFETY CONSIDERATIONS	. . 1
INSTALLATION	. 1
Step 1-Provide Unit Support	. . 2
ROOF CURB	. . 2
SLAB MOUNT	. . 2
ALTERNATE UNIT SUPPORT	. . 2
Step 2-Field Fabricate Ductwork	. 2
Step 3-Install External Trap for Condensate Drain	. . 2
Step 4-Rig and Place Unit	. . 2
POSITIONING	. . 4
Step 5 — Install Flue Hood	. . 4
Step 6 — Install Gas Piping	. . 4
Step 7 — Make Electrical Connections	. . 8
FIELD POWER SUPPLY	. . 8
FIELD CONTROL WIRING	. . 8
HEAT ANTICIPATOR SETTINGS	. . 8
Step 8 — Adjust Factory-Installed Options	. 17
COBRA™ ENERGY RECOVERY UNITS	. 17
HUMIDI-MIZER™ADAPTIVE
DEHUMIDIFICATION SYSTEM	. 17
MANUAL OUTDOOR-AIR DAMPER	. 17
CONVENIENCE OUTLET	. 17
NOVAR CONTROLS	. 17
PREMIERLINK™ CONTROL	. 19
OPTIONAL ECONOMI$ER IV AND
ECONOMI$ER2	. 22
ECONOMI$ER IV STANDARD SENSORS	. 23
ECONOMI$ER IV CONTROL MODES	. 24
Step 9 — Adjust Evaporator-Fan Speed	. 29
PRE-START-UP	. 45
START-UP	. 45
SERVICE	. 50
TROUBLESHOOTING	. 58
START-UP CHECKLIST	. 63

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. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Recognize safety information. This is the safety-alert symbol

. When you see this symbol on the furnace and in instructions or manuals, be alert to the potential for personal injury.

Understand the signal words DANGER, WARNING, and CAUTION. 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 a hazard 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.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.

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