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48VT(N) installation instructions 208/230-3-60Wiring Diagram, Unit 48VT-A, 48VT--A, A09209
Models:
48VT(N)
1
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Troubleshooting
Install
208/230-1-60Wiring Diagram, Unit 48VT-A
Dimension
Maintenance
Configuring Units for Downflow Vertical Discharge
Electrical Controls and Wiring
Symptom
Burner Assembly
Special Procedures for 208-VOperation
Page 25
Image 25
48VT--
A
A09209
Fig. 16 -
208/230-3-60
Wiring Diagram, Unit
48VT-A
25
Page 24
Page 26
Page 25
Image 25
Page 24
Page 26
Contents
SAFETY CONSIDERATIONS
TABLE OF CONTENTS
Fig. 1 - Unit 48VT-A
Installation Instructions
INTRODUCTION
RECEIVING AND INSTALLATION
Step 1 - Check Equipment
Step 2 - Provide Unit Support
48VT--A
Fig. 2 - 48VT-A24-30Unit Dimensions
A09146
48VT--A
Fig. 3 - 48VT-A36-60Unit Dimensions
A09147
48VT
Fig. 4 - Roof Curb Dimensions
SMALL CURB
ROOF CURB DETAIL
Step 5 - Rig and Place Unit
ACCESS PANELS MUST BE IN PLACE WHEN RIGGING
Inspection
Rigging/Lifting of Unit See Fig
Step 8 - Install Gas Piping
Step 7 - Install Flue Hood
Step 6 - Connect Condensate Drain
Fig. 6 - Condensate Trap
Configuring Units for Downflow Vertical Discharge
Step 9 - Install Duct Connections
Fig. 7 - Sediment Trap
FIRE OR EXPLOSION HAZARD
Fig. 8 - Supply and Return Duct Opening
Table 1 - Physical Data - Unit 48VT-A
48VT--A
Horizontal Duct Covers
Table 2 - Maximum Gas Flow Capacity
Table 1 - Physical Data - Unit 48VT-ACont’d
Table 3 - Heating Inputs
48VT--A
Special Procedures for 208-VOperation
Step 10 - Install Electrical Connections
High-VoltageConnections
Control Voltage Connections
PRE-START-UP
Balance Point Setting-Thermidistator Hybrid
Transformer Protection
Thermostat
START-UP
Step 3 - Start-upHeating and Make Adjust- ments
Step 1 - Check for Refrigerant Leaks
Step 2 - Unit Sequence of Operation
Fig. 11 - Burner Assembly
Adjust Gas Input
Check Heating Control
Check Gas Input
Limit Switches
Airflow and Temperature Rise
Check Burner Flame
Normal Operation
Rollout Switch
Step 4 - Start-upCooling and Make Adjust- ments
Checking and Adjusting Refrigerant Charge
Indoor Airflow and Airflow Adjustments
Continuous Fan Operation
Gas Heating Fan Speed Set-up
Table 6 - Color Coding for Indoor Fan Motor Leads
48VT--A
Table 8 - 48VT-AWet Coil Pressure Drop
Fig. 14 - Interface Fan Board IFB
48VT--A
Table 7 - Filter Pressure Drop Table IN. W.C
UNIT
48VT--A
Heating
48VT--A
1295
48VT--A
1445
48VT--A
1448
48VT--A
48VT A
Fig. 15 - 208/230-1-60Wiring Diagram, Unit 48VT-A
48VT--A
Fig. 16 - 208/230-3-60Wiring Diagram, Unit 48VT-A
A09209
48VT--A
Fig. 17 - Cooling Charging Table-Subcooling
50VT500173 REV
A09099
Cleaning the Blower Motor and Wheel
MAINTENANCE
Air Filter
Indoor Blower and Motor
Induced Draft combustion air Blower Assembly
Limit Switch
Fig. 18 - Blower Housing and Flue Collector Box
Fig. 19 - Unit Access Panels
Outdoor Fan
Electrical Controls and Wiring
Refrigerant Circuit
Fig. 20 - Removal of Motor and Blower Wheel
Loss of Charge Switch
Pressure Switches
High-PressureSwitch
Gas Input
Page
LCS - Loss of Charge Switch
HPS - High Pressure Switch
Fig. 24 - Refrigerant Circuit
AccuraterMetering De vice
START-UPCHECKLIST
TROUBLESHOOTING
UNIT OPERATION AND SAFETY HAZARD
Synthetic Roof Precautionary Procedure
48VT--A
PURONR R-410AQUICK REFERENCE GUIDE
48VT--A
SYMPTOM
Table 13 - Troubleshooting Guide-LEDStatus Codes
Table 12 - Troubleshooting Guide-Heating
48VT--A
Remove and Store in Job Files
TEMPERATURES
I. PRELIMINARY INFORMATION MODEL NO
PRESSURES
Catalog No 48VT---05SI
48VT--A
Edition Date 04/09
Replaces 48VT---04SI