Carrier 48EZ(N) - A, Installation Instructions Manual

Page: 1 / 38

1
48EZ(N)---A
Comfort
t
13 SEER Single---Packaged HYBRID HEAT
®
Dual Fuel System with Puron
r
(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 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Provide Clearances 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rig and Place Unit 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Condensate Drain 7 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Flue Hood 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Gas Piping 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Duct Connections 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Units for Downflow (Vertical)
Discharge 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Electrical Connections 13 . . . . . . . . . . . . . . . . . . . . . . . .
High--Voltage Connections 13 . . . . . . . . . . . . . . . . . . . . . . . .
Special Procedures for 208--V Operation 13 . . . . . . . . . . . . . .
Control Voltage Connections 13 . . . . . . . . . . . . . . . . . . . . . . .
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transformer Protection 13 . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRE--START--UP 14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP 15--18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Refrigerant Leaks 15 . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Sequence of Operation 15 . . . . . . . . . . . . . . . . . . . . . . . . .
Start--Up Heating and Make Adjustments 15 . . . . . . . . . . . . . . .
Checking Heating Control 16 . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gas Input 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjust Gas Input 16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Burner Flame 17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start--Up Cooling and Make Adjustments 18 . . . . . . . . . . . . . . .
Checking Cooling Control Operation 18 . . . . . . . . . . . . . . . .
Checking and Adjusting Refrigerant 18 . . . . . . . . . . . . . . . . .
Indoor Airflow and Airflow Adjustments 18 . . . . . . . . . . . . .
MAINTENANCE 28--34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Blower and Motor 28 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue Gas Passageways 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Switch 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner Ignition 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Burners 29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 29 . . . . . .
A09034
Fig. 1 -- Unit 48EZ--A
Outdoor Fan 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Controls and Wiring 30 . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Circuit 30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Input 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Airflow 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Defrost Thermostat 31 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Puron
R
Items 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP CHECKLIST 34 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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