Carrier 48VG-A Installation Instructions Manual

Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ......................... 1
INTRODUCTION ................................... 2
RECEIVING AND INSTALLATION ................. 2-14
Check Equipment .................................. 2
Identify Unit .................................... 2
Inspect Shipment ................................. 2
Provide Unit Support ............................... 2
Roof Curb ...................................... 2
Slab Mount ..................................... 3
Field Fabricate Ductwork ............................ 3
Provide Clearances ................................. 3
Rig and Place Unit ................................. 3
Inspection ...................................... 3
Rigging/Lifting of Unit ............................ 3
Connect Condensate Drain .......................... 10
Install Flue Hood .................................. 10
Install Gas Piping ................................. 11
Install Duct Connections ............................ 12
Configuring Units for Downflow (Vertical)
Discharge ..................................... 12
Install Electrical Connections ........................ 13
High-Voltage Connections ........................ 13
Special Procedures for 208-V Operation .............. 13
Control Voltage Connections ....................... 13
Standard Connection ............................. 14
Heat Anticipator Setting .......................... 14
Transformer Protection ........................... 14
PRE-START-UP ................................... 14
START-UP ..................................... 15-32
Check for Refrigerant Leaks ......................... 15
Start-Up Heating & Make Adjustments ................ 15
Check Heating Control ........................... 15
Check Gas Input ................................ 16
Adjust Gas Input ................................ 16
Check Burner Flame ............................. 18
Normal Operation ............................... 30
Airflow and Temperature Rise ...................... 30
Heating Sequence of Operation ..................... 30
Limit Switches ................................. 30
Rollout Switch ................................. 30
Start-Up Cooling & Make Adjustments ................ 30
Checking Cooling Control Operation ................ 30
Checking & Adjusting Refrigerant Charge ............ 31
Indoor Airflow and Airflow Adjustments ............. 31
Cooling Sequence of Operation ..................... 32
MAINTENANCE ................................ 53-56
Air Filter ...................................... 53
Indoor Blower and Motor ......................... 53
A0g033
Fig. 1 - Unit 48VG-A
(Low NOx Model Available)
Induced Draft (Combustion Air) Blower .............. 54
Flue Gas Passageways ............................ 54
Limit Switch ................................... 54
Burner Ignition ................................. 54
Main Burners ................................... 54
Removal of Gas Train ............................ 54
Outdoor Coil, Indoor Coil, & Condensate Drain Pan .... 54
Outdoor Fan ................................... 55
Electrical Controls and Wiring ..................... 55
Refrigerant Circuit ............................... 56
Gas Input ...................................... 56
Evaporator Airflow .............................. 56
Puron Items .................................... 56
TROUBLESHOOTING .............................. 57
START-UP CHECKLIST ............................ 57
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, 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 modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. consult local
building codes, the current editions of the National Fuel Gas Code
(NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code
(NEC) NFPA 70.
In Canada refer to the current editions of the National Standards of
Canada CAN/CSA-BI49.1 and .2 Natural Gas and Propane
Installation codes, and Canadian Electrical Code CSA C22.1
Recognize safety information. This is the safety-alert symbol /_.
When you see this symbol on the unit and in instructions or manu-
als, be alert to the potential for personal injury. Understand these