Lennox VRB144

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Technical Support

1-844-GET-VRF1

(1-844-438-8731)

vrftechsupport@lennoxind.com

www.LennoxVRF.com

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Main Page

General1
Shipping and Packing List1
Safety Requirements2
Model Number Identification2
System Piping2
Unit Dimensions - Inches (MM)3
Corner Weights3
Center of Gravity3
Back View4
Side View4
Dimensions - Piping Details - Inches (MM)5
Outdoor Unit Placement Considerations6
Lifting the Unit7
Single Row7
Two Rows7
Three or more Rows7
Clearances from Obstructions8
Maintenance & Service Clearance8
Perimeter Obstructions8
Obstructions above the Unit8
Cold Climate Considerations9
Do Not Locate under Roof Overhang9
Do Not Locate Where Drifting will Occur9
Secure Unit to Weather Resistant Support9
Air Discharge Duct10
Protect Unit from Prevailing Winds10
Static Pressure Settings10
Discharge Duct Pressure Curves12
Vrb07212
Vrb12012
Main/Sub Outdoor Unit Placement13
Installation13
Slab or Roof Mounting13
Main/Sub Unit Placement13
Refrigerant Piping Connections14
Oil Return Trap14
Maximum Permitted Refrigerant Pipe Length/ Maximum Height Difference15
Pipe Size Allowable Increase Diameters (In.)15
Outdoor Units15
Indoor Units15
Pipe and Component Names16
Indoor Unit Auxiliary Pipe Selection16
Typical Refrigerant Piping Diagram16
Outdoor Unit Main Pipe Selection (L1)17
INDOOR UNIT MAIN PIPE SELECTION (L1 to L13)17
OUTDOOR UNIT PIPE SELECTION (G1, G2, G3, G1)17
Outdoor Unit Branch Pipe Assembly Selection (L, M)17
Horizontal Runs20
Vertical Runs20
Horizontal Installation20
Vertical Installation20
Branch Pipe Kit Placement21
24 To 36” of Straight Pipe before and after Branch Pipe Kit21
Pressure Test22
Evacuate System22
Triple Evacuation Procedure22
Pressure Test Specifications22
Additional Refrigerant Charge23
Liquid Line Length Calculation23
Outdoor Unit Calculation23
Mode Selection Box Calculation23
Additional Charge Amount24
Maximum Additional Refrigerant Charge Amount24
Branch Pipe Kit Calculation25
Refrigerant Charge Calculation Example25
Refrigerant Charge Amount Calculation25
Refrigerant Discharge26
Connecting Manifolded Units27
Horizontal Surface27
Heat Recovery Parallel Piping Connections28
Connective Piping Sizes for Manifolded Outdoor Units28
Outdoor Unit Branch Pipe Kits29
Connecting Mode Selection Boxes30
MS Box Piping Connection Information30
Piping & Communication Cable Connection31
Mode Selection Box Wiring Diagrams31
Wiring Connections32
Power Terminal Strip32
Communication Terminal Strip32
Wiring Terminals32
Vrb072, 096, 120 - 230V33
Vrb072, 096, 120 - 460V33
Vrb144, 168, 192 - 230V34
Vrb144, 168, 192 - 460V34
Digital Display35
Normal Display35
Operating Display35
Outdoor Unit Main Board35
LCD Display36
Main Screen36
Oil Return36
Menu Structure37
VRB Electrical Data39
Settings, Functions and Configurations40
Dip Switch Settings and Configurations40
S4 Static Pressure Setting40
ENC 1 Outdoor Unit Address Setting40
Settings and Functions41
Electrical Installation for Indoor and Outdoor Units44
Troubleshooting46
Technical Support48

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