1
INSTALLATION
INSTRUCTION
VRF SYSTEMS -- Indoor Units
507896-02
06/2019
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
Shipping and Packing List
General
The VOSB outside air ducted indoor units are matched
with an outdoor heat recovery or heat pump unit to
create a VRF (variable refrigerant flow) system that uses
R-410A refrigerant. VOSB indoor units are designed for
indoor installation only.
Refer to the Product Specification bulletin (EHB) for
the proper use of these indoor units with specific heat
pumps, heat recovery units, mode switching devices,
branch pipes, line sets and controls.
VOSB Outside Air Ducted Units
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Check the components for shipping damage. If you find
any damage, immediately contact the last carrier.
Package 1 of 1 contains the following:
1 - Assembled high-static, concealed duct unit
1 - Digital Display Panel
2 - Refrigerant piping insulation sleeves
1 - Flexible condensate connector (VOSB036-054)
1 - Hose clamp (VOSB036-054)
1 - Condensate connection pipe (VOSB072-096)
(Packed in Supply side of cabinet.)
1 - Roll tape for condensate pipe (VOSB072-096)
1 - Condensate overflow connection harness
1 - 120 Ohm End of Line Resistor
1 - Installation manual
WARNING
Improper installation, adjustment, alteration, ser
vice or maintenance can cause property damage,
personal injury or loss of life.
Installation and service must be performed by a li
censed professional HVAC installer, service agency
or the gas supplier.
Failure to follow safety warnings and these instruc
tions exactly could result in property damage, dan
gerous operation, serious injury, or death.
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the ap
plication needs must be made by a licensed profes
sional HVAC installer (or equivalent) using factory
specified parts.
Do not use this system if any part has been under
water. A flood-damaged appliance is extremely dan-
gerous. Immediately call a licensed professional
HVAC service technician (or equivalent) to inspect
the system and to replace all controls and electrical
parts that have been wet, or to replace the system, if
deemed necessary.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
To ensure proper system performance and reliability,
Lennox does not recommend operation of VRF sys-
tems during any phase of construction. Construction
debris, low temperatures, harmful vapors, and opera-
tion of the unit with misplaced filters can damage the
units. Failure to follow these guidelines will result in the
warranty being voided.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting
of refrigerant (CFC’s and HCFC’s) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for non-compliance.
©2019 Lennox Industries Inc. Dallas, Texas, USA
VRF
