Lennox V8MSBB01, V8MSBB02, V8MSBB03, V8MSBB04 Installation Instructions Manual
©2018 Lennox Industries Inc.
Dallas, Texas, USA
V8MSBB04 Shown
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.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause property damage,
personal injury or loss of life.
Installation and service must be performed by a licensed professional HVAC installer, service agency
or the gas supplier.
Failure to follow safety warnings and these instructions exactly could result in property damage, dangerous operation, serious injury, or death.
Any additions, changes, or conversions required in
order for the appliance to satisfactorily meet the application needs must be made by a licensed professional HVAC installer (or equivalent) using factoryspecifi ed parts.
Do not use this system if any part has been under
water. A fl 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.
WARNING
The Mode Selection Box is factory fi tted with Black
plastic caps over the fl are connection points. These
must be replaced with the supplied brass fl are nuts.
Under no circumstances can the plastic caps be used
as a permanent seal even when not all ports are used.
A suitable blanking device must be fi tted on all unused
ports.
INSTALLATION
INSTRUCTIONS
Mode Selection Box
VRF SYSTEMS
507453-05
05/2018
Shipping and Packing List
Check the components for shipping damage. If you fi nd
any damage, immediately contact the last carrier.
Package 1 of 1 contains the following:
1 - Assembled mode selection box
3 - Insulation sleeves for piping from outdoor unit
1 - 1” X ¾” condensate drain adaptor
1 to 6* - ⅜” to ¼” adaptors
1 to 6* - ⅝” to ½” adaptors
1 to 6* - ¼” brass fl are nuts
1 to 6* - ½” brass fl are nuts
1 to 6* - Gas pipe insulation sleeve(s)
1 to 6* - Liquid pipe insulation sleeves
*Quantity of these items depends on number of refrigerant
piping connection pairs.
Installation
Mode selection boxes V8MSBB01, V8MSBB02, V8MSBB03 and V8MSBB04 are used with VRA heat recovery
outdoor units to allow simultaneous heating and cooling in
multiple zones. Mode selection boxes are designed for indoor installation only.
Mode selection boxes include solenoid valves which control
refrigerant fl ow through the individual indoor units so that
unit operation (heating or cooling) matches the comfort requirements being sent by the occupant.
Mode selection boxes are sized to accommodate up to 24
indoor units. See Table 1.
Mode selection boxes are equipped with fl ared fi ttings for
indoor unit refrigerant piping connections and braze fi ttings
for outdoor unit connections.
Refer to the Product Specifi cation bulletin (EHB) for the
proper use of mode selection boxes with matching VRA
heat recovery units, indoor units, branch pipes, line sets
and controls.
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.
1
CAUTION
To ensure proper system performance and reliability, Lennox does not recommend operation of VRF systems during any phase of construction. Construction debris, low
temperatures, harmful vapors, and operation of the unit
with misplaced fi lters 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.
System Piping
CAUTION
VRF system piping is customized for each installation.
The LVSS (Lennox VRF Selection Software) piping report
is an engineered design that must be followed. The piping
diagram or diagrams included within the LVSS report have
been prepared based on the information provided to the
Lennox VRF applications department.
When the indicated lengths change from the fi 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 confi 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 insuffi cient capacity,
equipment failure, warranty being made void and the
refusal to commission the system.
2
Unit Dimensions - inches (mm)
V8MSBB01, V8MSBB02, V8MSBB03, V8MSBB04
9
(229)
MOUNTING
LUGS (4)
11- 3/4
(298)
23-5/8
(600)
CONNECTIONS TO INDOOR UNITS
OUTDOOR UNIT
CONNECTIONS TO
CONDENSATE
DRAIN 1 (25) dia.
LOW
PRESSURE
GAS PIPE
TO OUTDOOR
UNIT
HIGH
PRESSURE
GAS PIPE
TO OUTDOOR
UNIT
LIQUID PIPE
TO OUTDOOR
UNIT
GAS
PIPE
LIQUID
PIPE
B
A
AB
Model No.
in. mm in. mm
V8MSBB01 24-3/4 629 19-1/4 489
V8MSBB02 24-3/4 629 19-1/4 489
V8MSBB03 37-3/4 959 32-1/4 819
V8MSBB04 37-3/4 959 32-1/4 819
Pipe Diameter - in.
Model No.
Low Pressure
Gas Pipe
Connections to Outdoor Unit Connections to Indoor Unit
High Pressure
Gas Pipe
Liquid
Pipe
1
Liquid Pipe
2
Gas Pipe
V8MSBB01 7/8 3/4 1/2 3/8 5/8
V8MSBB02 7/8 3/4 1/2 3/8 5/8
V8MSBB03 1-1/8 7/8 5/8 3/8 5/8
V8MSBB04 1-1/8 7/8 5/8 3/8 5/8
1
3/8 x 1/4 in. adaptor furnished for liquid pipe connection to outdoor unit (if required).
2
5/8 x 1/2 in. adaptor furnished for gas pipe connection to outdoor unit (if required).
3
Installation Clearances - inches (mm)
CONCRETE CEILING
Minimum
11-7/8 (300) Minimum
2 (51)
SUSPENDED CEILING
Required! Suitably sized access
panel required to provide full
access to electrical panel
24
(610)
REFRIGERANT
PIPE
59 (1500)
Maximum
PIPE
HANGER
59 (1500)
Maximum
15-3/4
(400)
CONNECTIONS TO INDOOR UNITS
36
(914)
Minumum
Suitably sized access panel for gaining access to flare nuts or isolating
ball valves if mounted above a solid ceiling
OUTDOOR UNIT
CONNECTIONS TO
36
(914)
Minimum
Access panels are a requirement for system commissioning and future
preventative maintenance.
4
Table 1. Mode Selection Boxes
Model No. Application
V8MSBB01* 1 group, 1 indoor unit maximum
V8MSBB02
V8MSBB03
V8MSBB04
*Use with VHIA072 and VHIA096 only.
2 groups, 4 indoor units maximum per group,
8 indoor units maximum
4 groups, 4 indoor units maximum per group,
16 indoor units maximum
6 groups, 4 indoor units maximum per group
24 indoor units maximum
1. Make sure that the structural ceiling is able to support
the weight of the mode selection box(es). It may be
necessary to add extra support. If the structural ceiling
is constructed of concrete, install anchors to accept
four ⅜ inch threaded rods to suspend the mode
selection box. If the structural ceiling includes wooden
joists, use angle iron or a Unistrut channel fi xed
securely in place to accept the ⅜ inch threaded rods.
See Figure 1.
Ǫ´7+5($'(D
CONCRETE CEILING
USING ANCHORS
$1&+25
ROD
Mode Selection Box Location
Consider the following items when positioning the mode
selection box for installation:
• Sounds are made by refrigerant as solenoid valves
open and close inside the mode selection box. Do not
install the mode selection box where these sounds
may disturb building occupants.
• The mode selection box must be sloped 1/8” toward
condensate drain outlet.
• Provide suffi cient clearance around mode selection
box to allow 3 feet of straight pipe before the fi rst
elbow or branch pipe is installed. See Figure 3.
• If the unit is being installed in an application that
includes a sheet rock (plasterboard) ceiling, it is
required that an access panel be installed in a
suitable location. This will also allow access for
future maintenance (requirement of Lennox warranty
program).
Access is required during the commissioning process
to check the internal components, solenoid valves and
associated fl are nuts (See page 3), and to check the
local disconnect.
ANGLE IRON
BOLTED IN PLACE
ACROSS WOODEN JOISTS
Ǫ´7+5($'(D
ROD
ANGLE IRON
ACROSS
WOODEN JOISTS
WOODEN JOIST
Figure 1. Suspending Methods
NOTE - Threaded rod (requirement of Lennox
warranty program) is the ONLY acceptable method of
suspending the unit; do not use chains or straps.
2. Slide one nut and one washer onto each threaded rod.
Use electrical tape to keep the washer from failing off.
Position the nuts slightly above the fi nal resting place
of the four suspension brackets.
Ǫ´7+5($'('
STRUCTURAL CEILING
SUSPENSION
BRACKETS
52'
Mode Selection Box Installation
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.
Use the provided suspension brackets to suspend the
mode selection box(es) between the outdoor and indoor
units. The mode selection box location must be able to
accommodate the size of the box, as well as the required
3 feet of straight pipe length between the box and the fi rst
elbow or branch pipe. Refer to the dimension drawing on
Page 3 and Figure 3.
LEVELING NUT
72:$5'&21'(16$7('5$,1&211(&7,21
%2;08676/23(´
SUSPENSION
BRACKET
Figure 2. Suspension Hardware
3. Raise the mode selection box and insert the threaded
rods into the suspension brackets. Slide a washer
and then a nut onto each rod below each suspension
bracket. Use the leveling nut (beneath suspension
bracket) to adjust the mode selection box. Remove
the electrical tape holding the upper washers and nuts
in place and tighten each of the four nuts above the
brackets down onto the brackets. The mode selection
box must be sloped 1/8” toward condensate drain
outlet.
4. Continue with refrigerant piping connections.
5
Refrigerant Piping Connections
WARNING
Refrigerant leaks are unlikely; however, if a refrigerant
leak occurs, open a door or windows to dilute the
refrigerant in the room. Turn off the unit and all other
appliances that may cause a spark. Call a licensed
professional HVAC technician (or equivalent) to repair
the leak.
Use only R410A refrigerant to charge this system. Use of
other refrigerant or gas will damage the equipment.
Do not allow air or other contaminants to enter system
during installation of refrigerant piping. Contaminants
will result in lower system capacity and abnormally high
operating pressures and may result in system failure or
explosion.
Insulate all refrigerant piping.
Refrigerant pipes may be very hot during unit operation.
Do not allow contact between wiring and bare copper
pipes.
After refrigerant piping connections have been
completed, check the system for leaks per
commissioning instructions.
WARNING
The Mode Selection Box is factory fi tted with Black
plastic caps over the fl are connection points. These
must be replaced with the supplied brass fl are nuts.
Under no circumstances can the plastic caps be used
as a permanent seal even when not all ports are used.
A suitable blanking device must be fi tted on all unused
ports.
IMPORTANT
Do not remove seals from refrigerant piping stubs until
connections are being made. This will prevent dust or
water from getting into the refrigerant piping before it is
connected.
From
Outdoor
Unit
To
Indoor
Unit
First Elbow or
Branch Pipe
Conection
>36”
>36”
MS
Box
Figure 3. Mode Selection Box Piping
6
• Refrigerant piping connections from outdoor unit(s)
are made with fi eld-brazed connections. Field piping
connections for the outdoor unit gas pipes and liquid
pipe are provided on the right side of the mode
selection box.
• The four available mode selection boxes can
accommodate varying numbers of indoor units. See
Table 1 and Figure 4.
Outgoing gas and liquid connections for the indoor
units are on the front of the box. Connections to the
indoor units are made using the provided brass fl are
nuts. Adaptors are provided with the mode selection
box to accommodate the use of different pipe sizes.
Refer to the LVSS (Lennox VRF Selection Software)
piping report for pipe sizes.
• Refer to the VRA heat recovery unit installation
instructions and product specifi cations (EHB) bulletin
for more detailed information on refrigerant piping
connections.
Gas pipe O.D. (5/8” O.D.1)
• Field refrigerant piping for the VRA heat recovery units
includes a variety of branch pipe kits, mode selection
boxes and fi eld-provided piping.
Outdoor unit branch pipe kits are used to join multiple
outdoor units to reach the required system capacity.
Mode selection box branch pipe kits are available
to evenly split system capacity among the varying
numbers of mode selection boxes.
Indoor unit branch pipe kits split the system capacity
among up to four indoor units per connection from
each mode selection box. See mode selection box
branch pipe kits in Figure 8 and a typical VRA system
piping schematic in Figure 9.
• Allow a minimum of 3 feet between the mode selection
box and the fi rst elbow or branch pipe in refrigerant
piping. See Figure 3.
• After refrigerant piping has been installed and checked
for leaks, apply the provided insulation sleeves over all
connections.
Low-pressure gas pipe (7/8” O.D.)
Liquid pipe O.D. (3/8” O.D.
2
)
High-pressure gas pipe (3/4” O.D.)
Liquid pipe O.D. (1/2” O.D.)
Drain connection (1” O.D.3)
V8MSBB01*
V8MSBB02
* Use with VHIA072 and 096 only. Connective branch pipe kit included with indoor unit.
Gas pipe O.D. (5/8” O.D.1)
Liquid pipe O.D. (3/8” O.D.
2
)
Low-pressure gas pipe (1-1/8” O.D.)
High-pressure gas pipe (7/8” O.D.)
Liquid pipe (5/8” O.D.)
Drain connection (1” O.D.
V8MSBB03
Gas pipe O.D. (5/8” O.D.1)
Liquid pipe O.D. (3/8” O.D.
2
)
Low-pressure gas pipe (1-1/8” O.D.)
High-pressure gas pipe (7/8” O.D.)
Liquid pipe (5/8” O.D.)
Drain connection (1” O.D.3)
V8MSBB04
3
)
1
3/8 x 1/4 in. adaptor furnished for liquid pipe connection to indoor unit (if required).
2
5/8 x 1/2 in. adaptor furnished for gas pipe connection to indoor unit (if required).
3
1 inch x 3/4 in. condensate drain adaptor furnished for fi eld installation (if required).
Figure 4. Mode Selection Box Piping Connection Details
7
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