Carrier 48EZ(N)-A - Manual

1
48EZ(N)---A
Comfort t 13 SEER Single---Packaged HYBRID HEATr
Dual Fuel System with Puron® (R---410A) Refrigerant
Single and Three Phase
2---5 Nominal Tons (Sizes 24---60)
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--2 . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RECEIVING AND INSTALLATION 2--13 . . . . . . . . . . . . . . . . .
Check Equipment 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identify Unit 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspect Shipment 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Provide Unit Support 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roof Curb 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slab Mount 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Field Fabricate Ductwork 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Provide Clearances 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rig and Place Unit 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Condensate Drain 7 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Flue Hood 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Gas Piping 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Duct Connections 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Units for Downflow (Vertical)
Discharge 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Electrical Connections 12 . . . . . . . . . . . . . . . . . . . . . . . .
High--Voltage Connections 12 . . . . . . . . . . . . . . . . . . . . . . . .
Special Procedures for 208--V Operation 12 . . . . . . . . . . . . . .
Control Voltage Connections 13 . . . . . . . . . . . . . . . . . . . . . . .
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transformer Protection 13 . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRE--START--UP 13--14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP 14--17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Refrigerant Leaks 14 . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Sequence of Operation 14 . . . . . . . . . . . . . . . . . . . . . . . . .
Start--Up Heating and Make Adjustments 14 . . . . . . . . . . . . . . .
Checking Heating Control 14 . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gas Input 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjust Gas Input 15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Burner Flame 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start--Up Cooling and Make Adjustments 16 . . . . . . . . . . . . . . .
Checking Cooling Control Operation 16 . . . . . . . . . . . . . . . .
Checking and Adjusting Refrigerant 17 . . . . . . . . . . . . . . . . .
Indoor Airflow and Airflow Adjustments 17 . . . . . . . . . . . . .
MAINTENANCE 32--38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Blower and Motor 32 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue Gas Passageways 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Switch 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner Ignition 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Burners 33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 33 . . . . . .
Outdoor Fan 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Controls and Wiring 34 . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Circuit 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A09034
Fig. 1 -- Unit 48EZ--A
Gas Input 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Airflow 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Defrost Thermostat 35 . . . . . . . . . . . . . . . . . . . . . . . . . . .
PuronR Items 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP CHECKLIST 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have 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--B149.1 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
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 hazards which could result in per-
sonal injury or death. CAUTION is used to identify unsafe practic-