Carrier 48VT(N) User's Manual
1
48VT(N)--A
Performancet 14 SEER Single--Packaged HYBRID HEAT®
Dual Fuel System with Puronr (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
. . . . . . . . . . . . . . . . . . . . . . . . .
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
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rig and Place Unit
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connect Condensate Drain
7
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Flue Hood
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Gas Piping
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Duct Connections
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Units for Downflow (Vertical)
Discharge
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Install Electrical Connections
11
. . . . . . . . . . . . . . . . . . . . . . . .
High- Voltage Connections
11
. . . . . . . . . . . . . . . . . . . . . . . .
Special Procedures for 208- V Operation
11
. . . . . . . . . . . . . .
Control Voltage Connections
11
. . . . . . . . . . . . . . . . . . . . . . .
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transformer Protection
12
. . . . . . . . . . . . . . . . . . . . . . . . . . .
PRE- START- UP
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START--UP
13--17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Refrigerant Leaks
13
. . . . . . . . . . . . . . . . . . . . . . . . .
Unit Sequence of Operation
13
. . . . . . . . . . . . . . . . . . . . . . . . .
Start- Up Heating and Make Adjustments
13
. . . . . . . . . . . . . . .
Checking Heating Control
14
. . . . . . . . . . . . . . . . . . . . . . . . .
Check Gas Input
14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjust Gas Input
14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Burner Flame
15
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start- Up Cooling and Make Adjustments
16
. . . . . . . . . . . . . . .
Checking Cooling Control Operation
16
. . . . . . . . . . . . . . . .
Checking and Adjusting Refrigerant
16
. . . . . . . . . . . . . . . . .
Indoor Airflow and Airflow Adjustments
16
. . . . . . . . . . . . .
Continuous Fan Operation
17
. . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE
27- 33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Blower and Motor
27
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Flue Gas Passageways
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Limit Switch
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Burner Ignition
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Burners
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outdoor Coil, Indoor Coil, & Condensate Drain Pan
28
. . . . . .
A09042
Fig. 1 - Unit 48VT- A
Outdoor Fan
29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Controls and Wiring
29
. . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Circuit
29
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Input
30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indoor Airflow
30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Defrost Thermostat
30
. . . . . . . . . . . . . . . . . . . . . . . . . . .
PuronR Items
30
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING
33
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START- UP CHECKLIST
33
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
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- 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
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