Lennox VPB H4-3P Series Installation instructions

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INSTALLATION/OPERATION
INSTRUCTIONS
Mini-VRF Heat Pump
VPB***H4-3P
VRF SYSTEMS
OUTDOOR UNITS
507998-01
10/2019
THIS MANUAL MUST BE LEFT WITH THE
OWNER FOR FUTURE REFERENCE
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
Shipping and Packing List
General
Check the components for shipping damage. If you
nd any damage, immediately contact the last car-
rier. Package 1 of 1 contains the following:
1 - Assembled Mini-VRF heat pump outdoor unit
1 - Outdoor unit installation instruction
The Mini-VRF heat pump outdoor units are matched
with up to nine indoor units to create a VRF (variable
refrigerant ow) system that uses R-410A refrigerant.
Refer to the Product Specication bulletin (EHB) for
the proper use of these heat pumps with matching
indoor units, header pipes, branch pipes, line sets
and controls.
These instructions are intended as a general guide
and do not supersede local or national codes in any
way. Authorities having jurisdiction should be con-
sulted before installation.
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-
specied parts.
Do not use this system if any part has been under
water. A ood-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.
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.
CAUTION
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 lters can damage the
units. Failure to follow these guidelines will result in the
warranty being voided.
©2019 Lennox Industries Inc. Dallas, Texas, USA
VRF

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Model Number Identication
Safety Requirements
ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.
Do not touch the unit or the controller if your hands are wet.
Do not operate appliances with an open ame near the unit.
Do not replace a fuse with a fuse of a di󰀨erent rating. Do not use a jumper wire to replace a fuse. Do not insert
your hands, tools or any other item into the air intake or air outlet at either the indoor or outdoor unit.
Do not allow children to operate the system.
WARNING
!
V P B 036 H 4 M - 3 P
Brand/Family
V = Variable Refrigerant Flow (VRF)
Unit Type
P = Heat Pump Outdoor Unit
Major Design Sequence
B = 2nd Generation
Voltage
P = 208/230V-1 phase-60hz
Cooling E󰀩ciency
H = High E󰀩ciency
Minor Design Sequence
3 = Controls Protocol
Refrigerant Type
4 = R-410A
Refrigerant Circuits
M = Multiple Circuits
Nominal Cooling Capacity - Tons
036 = 3 Tons
048 = 4 Tons
060 = 5 Tons
System Piping
CAUTION
VRF system piping is customized for each installation.
The Lennox VRF Selection Software (LVSS) piping
report is an engineered design that must be followed.
ThepipingdiagramordiagramsincludedwithintheLVSS
report have been prepared based on the information
provided to the Lennox VRF applications department.
When the indicated lengths change from the gures
stated within the report, it is imperative that prior to the
commencement of the refrigerant pipe work installation,
Lennox VRF applications department are informed of
these proposed changes.
Upon receipt of this new information the Lennox VRF
applications department will conrm any changes that
may be applicable to this installation. If changes are
required, a new piping diagram will be produced and will
supersede all other previously provided documents.
Failure to provide this information regarding changes
to the original design may lead to insu󰀩cient capacity,
equipment failure, warranty being made void and the
refusal to commission the system.
CAUTION
NOTE - Lennox VRF and Lennox Mini-Split products are similar in appearance to each other. Refer to the unit’s model
number to determine if the unit is a VRF (V) or Mini-Split (M) unit. It is not possible to mix the two types of equipment
on any system.

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35-3/8 (899)
52-1/4
(1327)
TOP VIEW
FRONT VIEW
14-1/4
(362) 15-3/4
(400)
13-3/4
(349) 12-5/8
(321)
3/4
(19) 23-5/8 (600) 6
(152)
CC
CENTER OF
GRAVITY
DD
BB
AA
EE
FF
Dimensions - Inches (mm)
CORNER WEIGHTS CENTER OF GRAVITY
Model No. AA BB CC DD EE FF
lbs. kg lbs. kg lbs. kg lbs. kg in. mm in. mm
All Models 40 18 63 29 72 33 45 21 21-5/8 549 7-3/8 187

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Installation Clearances - inches (mm)
12 (305) Minimum
(Wall or Partition)
Air Outlet
Air Inlet
Air inlet
Single Unit Installation
Parallel Units Side by Side
Parallel Units Back to Back, Facing and Front to Back
Front of Unit
Front of Units
12
(305)
Minimum
79 (2007)
Minimum
24
(610)
Minimum
(Service
Clearance)
12 (305) Minimum
79 (2007)
Minimum
24
(610)
Minimum
(ServiceClearance)
12
(305)
Min.
118
(2997)
Min.
118
(2997)
Min.
20
(508)
Min.
79
(2007)
Min.
Back to Back Facing Units Front to Back
(Wall or Partition)
(Wall or Partition)
(Wall or Partition)
NOTE - 24 in. (610 mm) clearance required on top of unit.
NOTE - If unit is surrounded on three
or four sides by walls or partitions
that are taller than 10 ft. (3 m), call
Lennox VRF Applications group to
discuss additional requirements.

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Unit Placement
Outdoor Unit Positioning Considerations
In addition to clearances, the following items should
be considered when setting the outdoor unit:
• Some local governments have adopted sound
ordinances based on the unit’s sound level reg-
istered from the adjacent property, not from the
property where the unit is installed. Install the
unit as far as possible from the property line.
• Glass has a very high level of sound transmis-
sion. When possible, do not install the unit direct-
ly outside a window.
• Avoid installing the unit in areas exposed to ex-
treme voltage variations (such as factories).
• Install unit level.
• Install the unit high enough above the ground or
roof to allow adequate drainage of defrost wa-
ter and prevent ice or snow build-up (required for
heat pumps).
• The unit base should be elevated above the
depth of average snows. In heavy snow areas,
do not locate the unit where drifting will occur.
• When installed in areas where low ambient tem-
peratures exist, locate unit so winter prevailing
winds do not blow directly into outdoor unit.
• Locate unit away from overhanging roof lines
which would allow water or ice to drop on, or in
front of, coil or into unit.
• Allow su󰀩cient space around unit for proper op-
eration and maintenance.
• Install the outdoor unit a minimum of 3 feet away
from any antenna, power cord (line), radio, tele-
phone, security system, or intercom. Electrical
interference and radio frequencies from any of
these sources may a󰀨ect operation.
Lifting the Unit
• Do not hold the air inlet grille while lifting the unit.
This could result in damage to the cabinet.
• Do not touch the fan blades with your hands or
other objects while lifting the unit.
Installation
Slab or Roof Mounting
Install the unit a minimum of 4 inches (102 mm)
above the roof or ground surface to avoid ice build-up
around the unit. Locate the unit above a load bearing
wall or area of the roof that can adequately support
the unit. Consult local codes for rooftop applications.
• Use a eld-provided slab or frame as specied in
the Product Specications (EHB) bulletin.
• Install the unit in an upright and level position.
• If the unit coil cannot be installed away from
prevailing winter winds, a wind barrier should
be constructed. Size barrier at least the same
height and width as outdoor unit. Install barrier
12 inches (305 mm) minimum from the sides of
the unit in the direction of prevailing winds.
WARNING
Use the provided and specied components when
installing equipment. Failure to do so may result in
unit falling, water leaking or electrical shocks, caus-
ing personal injury or equipment or property dam-
age.
Check stability of unit support. If support is not
capable of carrying weight of the unit, unit may fall
causing personal injury or equipment damage.
Safely dispose of packing materials, which include
nails, wood and other sharp objects, as well as
plastic wrapping. Children playing with plastic wrap
or bags risk the danger of su󰀨ocation.
IMPORTANT
Exhaust vents from dryers, water heaters and
furnaces should be directed away from the
outdoor unit. Prolonged exposure to exhaust
gases and the chemicals contained within them
may cause condensation to form on the steel
cabinet and other metal components of the out-
door unit. This will diminish unit performance
and longevity.
IMPORTANT
Roof Damage!
This system contains both refrigerant and
oil. Some rubber roong material may absorb
oil. This will cause the rubber to swell when
it comes into contact with oil. The rubber will
then bubble and could cause leaks. Protect the
roof surface to avoid exposure to refrigerant
and oil during service and installation.
Failure to follow this notice could result in dam-
age to roof surface.

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Figure 1. Securing Outdoor Unit to Slab
FIELD-PROVIDED
ANCHOR BOLTS (4)
(Two on each side)
Condensate Drains
• The bottom of the outdoor unit is equipped with
multiple drain holes to route water away from the
unit during a defrost cycle. See gure 3.
• If water produced during the defrost cycle is not
drained away from the unit before it re-freezes,
the drain may be blocked by ice.
• Protect drain holes to avoid access to the inside
of the unit by bugs and other pests.
• Use a eld-provided base pan if required for the
application.
Figure 3. Factory-Provided Drains
DRAIN HOLE
DRAIN HOLE
BOTTOM VIEW
Securing Outdoor Unit to Slab or Frame
• Brackets are provided at the base of the outdoor
unit so that it can be secured to a eld-provided
slab or frame.
• Use lag bolts or equivalent to secure the outdoor
unit to the slab or frame. Figure 1.
Air Inlet
Air Outlet
12 in
305 mm
Figure 2. Unit on Wall-Mounted Brackets
NOTE - Minimum rear clearance can be 6 inches
(152 mm) when mounted on brackets and with no
obstructions on the other three sides.
Securing Outdoor Unit to Wall-Mounted Brackets
• Units can be secured to eld-provided wall-
mounted brackets as long as the following
conditions are met.
• Use lag bolts or equivalent to secure the outdoor
unit to the wall-mounted brackets. Figure 2.
• Maintain proper air ow clearances.
NOTE - Minimum rear clearance can be 6 inches
(152 mm) when mounted on brackets and with
no obstructions on the other three sides.

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Air Outlet
24 in
610 mm
12 in
305 mm
Air Inlet
Pedestal
(stand)
Cold Climate Considerations
Snow and Ice Protection
• Install the unit high enough above the ground or
roof to allow adequate drainage of defrost water
and prevent ice or snow build-up.
• Carefully consider how to manage defrost water
disposal to prevent ice from blocking walkways
or creating a safety hazard near the outdoor unit.
• In heavy snow areas, do not locate the unit
where drifting will occur. The unit base should
be elevated above the depth of average snows.
Locate unit away from overhanging roof lines
which would allow water or ice to drop on, or in
front of, coil or into unit.
• There must be unobstructed air ow around the
air inlet and the air outlet.
• The unit must not be installed in areas where a
ammable gas leak may occur.
Figure 4. Unit on Pedestal (Stand) Above Snow
Line
Protective
canopy
Front ViewSide View
Protective
canopy
Pedestal
(stand)
NOTE - VPB***H4-3P units have a factory-installed
base pan heater.
CAUTION
When operating the heat pump in a low outdoor
ambient temperature, be sure to follow the instructions
described below.
- To prevent exposure to wind, install the outdoor unit
with its suction side facing the wall.
- Never install the outdoor unit at a site where the
suction side may be exposed directly to wind.
- To prevent exposure to wind, install a wind barrier on
the air discharge side of the outdoor unit.
- In heavy snowfall areas, select an installation site
where the snow will not a󰀨ect the unit.
Air Outlet
79 in
2007 mm
12 in
305 mm
Air Inlet
Figure 5. Air Flow Obstructed by Snow

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Figure 7. Avoid Defrost Water Ice Hazard
12” (305mm)
Min. Distance
Wind Barrier
Inlet Air
Prevailing Winter Winds from Air Inlet Side
Discharge Air
Wind Barrier
Prevailing Winter Winds From Air Discharge Side
79” (2007mm)
Min. Distance
Figure 8. Unit with Wind Barrier
Prevailing Winds Protection
If unit coil cannot be installed away from prevailing
winter winds, some method of protecting the
coil is required. Minimum clearances from wind
barrier must be observed at all times. Common
application examples are:
• Construct a wind barrier. Size barrier at least the
same height and width as outdoor unit. Install a
barrier 12 inches (305 mm) minimum from the
sides of the unit in the direction of prevailing
winds.
• Install outdoor unit in non-conned space.
• Install outdoor unit in alcove or under roof
overhang but not under or directly near a storm
gutter.
12 in
305 mm 24 in
610 mm
24 in
610 mm
12 in
305 mm
Figure 9. Unit Inside of Mechanical Enclosure
NOTE - Minimum clearances apply.
Air Inlet
Air Outlet
12 in
305 mm
Figure 6. Unit on Brackets Above Snow Line
NOTE - Minimum rear clearance can be 6 inches
(152 mm) when mounted on brackets and with no
obstructions on the other three sides.

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Figure 10. Unit installed in Alcove
Buried Refrigerant Pipe Protection
• All refrigerant lines must be insulated
regardless of if it is buried.
• In addition to insulating each line of piping,
buried lines must rest inside a sealed,
watertight conduit.
• The conduit must be designed so it cannot
collect and retain water.
NOTE - Minimum clearances apply.
Insulated Refrigerant Pipes
Watertight seal
Conduit
Structure
Watertight seal
Watertight seal
Figure 11. Buried Refrigerant Pipe Protection

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12 (305) Minimum
(Wall or Partition)
Air Outlet
Air inlet
Front of Unit
12
(305)
Minimum
24
(610)
Minimum
(Service
Clearance)
Coil Air Inlet
Top View
36
(914)
Minimum
(Service
Clearance)
55
(1397)
Before
Adjacent
Obstructions
Supply air inlet
requirements
1721.06 sq.in.
or
CFM = 4100
24 in. (610 mm) clearance
required on top of unit.
Makeup air requirements are equal
to or greater than discharge air
volume. Size makeup air openings
appropriately to supply adequate air
for the outdoor unit.
Unit clearances apply.
Check fan load amps (FLA), during
Forced Cooling operation, after
installation.
Install a field-supplied drain pan
under the unit.
NOTES- Louver angle should not exceed 15°.
Installing the Unit Inside of Building
Mini-VRF outdoor units may be installed indoors if
the following guidelines are followed.
• Refer to Figure 12 for critical clearances.
• If eld-fabricating ductwork to directly discharge
air outdoors, use the dimensions shown in Fig-
ure 15 as a guide.
• Include inspection doors in discharge ductwork
within 12 inches (305 mm) of the unit.
• Do not restrict access to the unit’s electrical
service panel.
Figure 12. Inside Installation Clearances
• Allow enough space between the unit and exte-
rior wall to allow for coil service.
• Provide a drain pan underneath the unit to pre-
vent condensation leaks.
• Contact VRF Applications support for guidance
for your application.
email: [email protected]
phone: 844-GET-VRF1 (844-438-8731)