Lennox VWMA007S4 User manual

1
©2015 Lennox Industries Inc.
Dallas, Texas, USA
INSTALLATION
INSTRUCTION
VRF SYSTEMS -- Indoor Units
507462-02
10/2015
THIS MANUAL MUST BE LEFT WITH THE OWNER FOR
FUTURE REFERENCE
Shipping and Packing List
General
Check the components for shipping damage. If you find any
damage, immediately contact the last carrier.
Package 1 of 2 contains the following:
1 - Assembled indoor unit with mounting bracket
8 - Mounting bracket securing screws
8 - Plastic screw anchors
1 - Roll tape
1 - Flexible condensate drain pipe
1 - Wall sleeve
1 - Plastic cover for wall sleeve
1 - Resistor
1 - Brass flare nut
1 - Installation manual
The VWMA wall-mounted indoor units are matched with an
outdoor heat recovery or heat pump unit to create a VRF
(variable refrigerant flow) system that uses HFC-410A
refrigerant.
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.
These instructions are intended as a general guide and do
not supersede local or national codes in any way.
Authorities having jurisdiction should be consulted 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 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.
The State of California has determined that this
product may contain or produce a chemical or
chemicals, in very low doses, which may cause
serious illness or death. It may also cause cancer,
birth defects, or reproductive harm.
CAUTION
!
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal edges.
Be careful when you handle this equipment.
VWMA Wall-Mounted Units
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
IMPORTANT!
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFCs, HCFCs and HFCs)
as of July 1, 1992. Approved methods of recovery,
recycling or reclaiming must be followed. Fines and/
or incarceration may be levied for noncompliance.
These units must be installed as a part of a matched
system as specified in the Product Specifications
(EHB) bulletin.
Not for use with V0CTRL90 Auxiliary Heat Relay.
See Service and Application Note VRF-15-01.

2
V WM A 012 S 4 - 1 P
Brand/Family
V = Variable Refrigerant Flow (VRF)
Unit Type
WM = Wall Mounted Non-Ducted Indoor Models
Major Design Sequence
A = 1st Generation
Cooling Efficiency
S = Standard Efficiency
Refrigerant Type
4 = R-410A
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
Nominal Cooling Capacity - Btuh
007 = 7000 Btuh
009 = 9000 Btuh
012 = 12,000 Btuh
015 = 15,000 Btuh
018 = 18,000 Btuh
024 = 24,000 Btuh
030 = 30,000 Btuh
Voltage
P = 208/230V-1 phase-60hz
Model Number Identification
Safety Requirements
ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.
Do not touch the unit or the controller if your hands are wet.
DO NOT spray water on the indoor unit for any reason.
Do not replace a fuse with a fuse of a different 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
!

3
Unit Dimensions - inches (mm)
Size ABCD
in. mm in. mm in. mm in. mm
007, 009, 012 36 914 11-3/8 289 28-7/8 733 27-1/4 692
015, 018 42-1/4 1073 12-3/8 314 35-1/8 892 33-1/8 841
FRONT VIEW
TOP VIEW
SIDE VIEW
SIDE VIEW 9 (229)
C
A
B
D
3-1/4
(83)
4-1/2
(114)
VWMA007S4, VWMA009S4, VWMA012S4, VWMA015S4, VWMA018S4
FRONT VIEW
TOP VIEW
SIDE VIEW
SIDE VIEW
9-3/4 (248)
44-5/8 (1133)
49-1/4 (1251)
12-3/4
(324)
VWMA024S4, VWMA030S4

4
Clearances
5
(127)
Minimum
FRONT VIEW
WALL WALL
Vertical Clearance - Clearance to Floor - 72 inches (1829 mm) Minimum
NOTE - Provide 96 inches (2438) clearance to floor for best performance
Vertical Clearance - Clearance to Ceiling - 6 inches (152 mm) Minimum
5
(127)
Minimum
Indoor Unit Placement
AVOID
Do not install the unit in the following locations:
• Areas exposed to salt or other corrosive materials or
caustic gases
• Areas exposed to extreme voltage variations (such as
factories)
• Tightly enclosed areas that may impede service of the
• unit.
• Areas exposed to strong electromagnetic forces
• Areas exposed to acids or alkaline detergents (laundry
• rooms)
DO:
• Locatetheunit sothatitis not exposedtodirect sunlight.
• Locate the indoor unit so that the room can be uniformly
cooled. Install unit as high as possible on the wall (8
feet above floor, if possible) for best performance.
• Select a wall location that can support the weight of the
unit.
• Select a location where condensate line will have the
shortest run to a suitable drain per local codes.
• Allow sufficient space around unit for proper operation
and maintenance (filter must able to be removed from
the top-front of the unit).
• Install the indoor unit a minimum of 3 feet away from
any antenna, power cord (line), radio, telephone,
security system, or intercom. Electrical interference and
radio frequencies from any of these sources may affect
operation.
WARNING
!
Do not install the unit in an area where flammable
materials are present due to risk of explosion
resulting in serious injury or death.
If the basis underneath the unit is not strong enough
to support the weight of the unit, the unit could be fall
out of place and cause serious injury.
Use the provided and specified components when
installing equipment. Failure to do so may result
in unit falling, water leaking or electrical shocks,
causing personal injury or equipment or property
damage. Check stability of wall-mounted unit
support. If support is not capable of carrying weight
of the unit, unit may fall causing personal injury or
equipment damage.
Consider the possibility of earthquakes in your
area when installing the equipment. If the unit is not
correctly secured, it 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 suffocation.
CAUTION
!
Do not place items which may be damaged by water
under or around the indoor unit.
The unit should be installed at least 8 feet above the
floor (if possible) to ensure maximum performance
and comfort.

5
DETERMINING WALL MOUNTING PLATE LOCATION
1. Remove the wall mounting plate from the back of the
indoor unit.
2. Determine the best exit location for utility bundle (line
set, condensate line and wiring).
3. Position the wall mounting plate on the wall so that,
when installed, the unit will be at least 6 inches (152
mm) from the ceiling and 5 inches (127 mm) from the
wall on either side. The wall mounting plate must be
level side-to-side.
4. Use the wall mounting plate as a template to determine
the exit point for utility bundle. Mark the wall to facilitate
drilling hole for utility bundle.
Right piping
Left piping
Right back piping
Left back piping
Figure 1. Determining Exit Locations
Installation
WALL MOUNTING PLATE INSTALLATION
Installthewallmountingplatesothatitiscorrectlypositioned
horizontally and vertically. The indoor unit must be installed
level on the wall to allow proper condensate drainage.
1. Use a carpenter's level or measuring tape to verify the
wall mounting plate is horizontally level.
2. Secure the wall mounting plate to the wall using the
provided screws and screw anchors. NOTE - It is
important to use all screws provided to secure the wall
mounting plate to the wall. Additional holes may be
drilled through the metal wall mounting plate to better
secure wall plate. Field-provided anchors/fixings may
be required depending on wall construction. Use the
appropriate type of anchors for the application.
3. The wall mounting plate must be installed flush against
the wall so that the indoor unit will be flush after
installation. Any space between the wall and unit will
cause noise and vibration.
4. The wall mounting plate must be installed horizontally
level on the wall.
Figure 2. Wall Mounting Brackets
Outline of Indoor Unit
VWMA007S4, VWMA009S4 and VMWA012S4 Units
VWMA024S4 and VWMA030S4 Units
VWMA015S4 and VWMA018S4 Units
Wall Mounting Bracket
Wall Mounting Bracket
Outline of Indoor Unit
Outline of Indoor Unit
Wall Mounting Bracket

6
WALL SLEEVE INSTALLATION
The utility bundle may be routed out of the back of the unit
or out either side. If the bundle is to be routed out the back
through an external wall, use a field-provided wall sleeve to
protect the utility bundle. NOTE - If the utility bundle will be
routed out the side of the indoor unit and up the wall above
a false ceiling, continue to the next section.
1. Prior to making the hole and installing the wall sleeve
for the utility bundle, check to ensure that there are no
otherutilities locatedin thewallbehind thehole location.
2. Cut a hole in the wall using a suitable hole saw. Hole
should be at a slight downward slant - 3/16” to 3/8”
toward the outdoor side.
WARNING
!
Electric Shock Hazard. Can cause injury or death.
Avoid location where electric wiring or conduits may
be present inside the wall.
3. Measure the thickness of the wall from the inside edge
to the outside edge and cut the field-provided wall
sleeve at a slight angle 1/4” (6 mm) shorter than the
thickness of the wall.
Figure 3. Boring Hole for Wall Sleeve
INSIDE
OUTSIDE Typical
installation
procedure
shown.
4. Place the provided plastic cover over the end of the
pipe that will be visible from the inside wall and insert
the pipe in the wall.
NOTE - When passing bundled services through an exterior
brick or concrete wall, protect the copper pipes and wiring
from the effects of these construction materials by using a
sleeve made of a suitable material. The integrity of copper
pipe and wiring can deteriorate when exposed to these
construction materials
USE SUITABLE TOOL TO CUT PVC FOR WALL
SLEEVE AT SLIGHT ANGLE AS SHOWN.
Figure 4. Cutting PVC for Wall Sleeve
INSTALL UNIT ON WALL MOUNTING PLATE
1. A length of field-provided flexible condensate piping
should be connected to the drain prior to securing the
unit to the wall mounting plate.
2. If the factory-provided refrigerant piping connections
and field-provided flexible condensate piping are long
enough to enable final field connections after unit is
installed on wall mounting plate, use field-provided tape
to bundle them together.
3. The utility bundle may be routed out of the back of the
unit or out either side. If the bundle is to be routed
out the back through an external wall, feed the utility
bundle through the wall sleeve. If the utility bundle is
to be routed out of the side of the indoor unit and up
an inside wall, carefully form the utility bundle so that it
makes a gentle 90° turn.
4. Align the back of the indoor unit with the hooks at the
top of the wall mounting plate. Move the unit from side
to side to make sure that it settles securely.
5. Thebottomoftheunitcanbeliftedtofacilitaterefrigerant
piping and condensate drain connections, if necessary.
See figure 6.
TEMPORARY
SPACER
(To facilitate
connections)
HOOKS AT TOP
OF MOUNTING
BRACKET
Figure 6. Secure Unit to Wall Mounting Plate

7
Refrigerant Piping Connections
WARNING
!
Refrigerantleaksareunlikely;however,ifarefrigerantleak
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.
Afterrefrigerant pipingconnections havebeen completed,
checkthesystemforleaksper commissioninginstructions.
Field piping consists of two copper lines connected to the
indoor unit. Table 1 lists the connection sizes at the indoor
unit. The connections are made using the provided brass
flare nuts at the end of the refrigerant piping connections.
Both lines must be individually insulated.
1. The seal on the unit refrigerant piping connections
should remain in place until the last possible moment.
This will prevent dust or water from getting into the
refrigerant piping before it is connected.
2. CAREFULLY adjust refrigerant piping connections to
suit the application (straight back, right or left).
3. Slowly loosen one of the flare nuts to release the factory
nitrogen charge.
4. Remove the flare nuts from the connections on the unit
anddiscardthesealfromeachofthepipingconnections.
5. Slide the flare nuts onto the ends of the field-provided
refrigerant piping before using a suitable flaring tool to
flare the end of the copper pipe.
6. Apply recommended HFC-410A refrigerant lubricant to
the outside of the flared refrigerant lines (figure 7-A).
IMPORTANT!
The compressor in this unit contains PVE
oil (Polyvinylether). PVE oil is formulated for
hydrofluorocarbon (HFC) refrigerants, such as R-
410a, which this system contains. While it may have
some miscibility properties with mineral-based oil
and POE oil (Polyolester), it is not recommended to
mix PVE oil with any other type of refrigerant oil.
Size
(Btuh) Liquid Line in. Vapor Line in.
7000
12000
15000 1/4 1/2
18000
24000
30000
36000
48000
3/8 5/8
Table 1. Refrigerant Piping Connections
7. Alignthethreadedconnectionswiththeflaredrefrigerant
lines. Tighten the flare nuts lightly at first to obtain a
smooth match (figure 7-B).
8. Once snug, continue another half-turn on each nut
which should create a leak-free joint. A torque wrench
may be used to tighten flare nuts using table 2
recommendations. See figure 4. Do not over-tighten
a flared joint. Flared connections should always
be accessible and must be insulated to prevent
condensation.
9. After refrigerant piping has been installed and checked
for leaks, apply insulation over the connector pipe and
all flared connections.
A
B
CANT ON THE OUTSIDE OF
THE FLARE
MALE FLARE
CONNECTION
Figure 7. Making Connections
(Male to Female Connection)
IMPORTANT!
Always use two wrenches when tightening flare
nuts to avoid twisting refrigerant piping. DO
NOT over-tighten flare nuts.
TORQUE WRENCH
TO INDOOR
UNIT
TO OUTDOOR UNIT
BACKUP
WRENCH
Figure 8. Tighten Flare Nut

8
Outside
Diameter Recommended Torque No torque wrench available
Finger tighten and
use an appropriately
sized wrench to turn an
additional:
Inches U.S.
1/4” 15 ft.-lb. 1/4 turn
3/8” 26 ft.-lb. 1/2 turn
1/2” 41 ft.-lb. 7/8 turn
5/8” 48 ft.-lb. 1 full turn
Table 2. Flare Nut Torque Recommendations
IMPORTANT!
Flared connections should always be accessi-
ble and must be insulated to prevent condensa-
tion. See figure 9.
UNIT
BASE
INSULATE ALL FLARED CONNECTIONS
TO PREVENT CONDENSATION
Figure 9. Insulate Flared Connections
1. Make a water-tight connection between the field-
provided condensate drain line and the flexible
condensate connector.
2. See figure 10 for applications including a single unit
and a single drain. In this case, ensure that the drain
line is properly sloped (no less than 1/4 inch per foot)
and condensate lines are routed to ensure moisture is
drained away from the indoor unit.
3. Drainshouldbeasshortaspossibleandshouldnothave
any droops or kinks that would restrict condensate flow
and shall be approved resistant pipe. There must be
a 2-inch space between the end of the condensate
drain and the final termination point (ground, open
drain, etc.) to ensure that the line will drain freely.
4. After system installation is complete, the condensate
drain line must be checked for leaks. This check is
part of the commissioning sequence. If a field-provided
condensate pump has been installed, it must be
checked to ensure proper operation. This check is part
of the commissioning sequence.
Condensate Piping Connections
CAUTION
!
Make sure that drain piping is properly routed
and insulated in order to prevent both leaks and
condensation.
IMPORTANT!
Drain should have a slope of at least ¼ inch per
foot and should be approved corrosion-resis-
tant pipe.
You must confirm operation of every drain and
pump in the system as part of the commission-
ing procedure.
DRAIN LINE
3 ft. (1 m)
SUPPORT
STRAPS
Figure 10. Condensate Drain Piping

9
Wiring Connections
WARNING
!
Isolate the power supply before accessing unit
electrical terminals.
Install unit so that unit disconnect is accessible.
Follow all local and national codes, as well as this
installation instruction, during installation. Do NOT
overload electrical circuit, as this may lead to failure
and possible fire.
Use specified wiring and cable to make electrical
connections. Clamp cables securely and make sure
that connections are tight to avoid strain on wiring.
Insecure wiring connections may result in equipment
failure and risk of fire.
Wiring must be installed so that all cover plates can
be securely closed.
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to unit nameplate for minimum circuit ampacity and
maximum overcurrent protection size.
NOTE - Three-conductor shielded cable must be used for
the communication wiring. This is necessary to ensure
proper system communication and operation.
CAUTION
!
This unit must be properly grounded and protected
by a circuit breaker. The ground wire for the unit must
not be connected to a gas or water pipe, a lightning
conductor or a telephone ground wire.
Do not connect power wires to the outdoor unit until
all other wiring and piping connections have been
completed.
Install all wiring at least 3 feet away from televisions,
radios or other electronic devices in order to avoid
the possibility of interference with the unit operation.
Do not install the unit near a lighting appliance that
includes a ballast. The ballast may affect remote
control operation.
1. Lift indoor unit front panel to access the control box
over. Remove the screw(s) securing the cover. Remove
the plate.
2. Locate the terminal strip in the control box. Connect the
power wiring (sized per NEC/CEC and local codes) and
communications cable (three-conductor, shielded
cable). Refer to unit nameplate for rated voltage.
3. If the indoor unit is the final unit in a group that is wired
in series, install the provided resistor across terminals
P and Q.
4. Remove spacer. Secure bottom of unit to wall mounting
bracket. Continue with installation of outdoor unit and
system commissioning.
CONTROL BOX
COVER
POWER WIRING COMMUNICATIONS
WIRING
Figure 11. Accessing Control Box
Network Address and Commissioning
After the system has been installed, each indoor unit must
be assigned an address as part of the commissioning
procedure.

10
Figure 12. Typical VWMA007 to 018 Wiring Diagram
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
T1
MAIN CONTROL BOARD
INDOOR UNIT POWER
208-230V
CONNECT TO
WIRED CONTROLLER CONNECT TO
OUTDOOR
UNIT
WEEKLY TIMER
TROLLER
DISPLAY BOARD
WIRED
CONTROLLER
REMOTE
ON / OFF
NOTE - Dashed line indicates optional or field-
wired components.
NOTE - If indoor unit is the final unit in a group
wired in series, install provided resistor across
terminals P and Q.
NOTE - Use 3-conductor, shielded cable for
communication wiring.
FM
WHITE
WHITE(GRAY)
C
TR
Y/G
EEV
CN10 WHITE
CN15 CN5
CN3
CN24
CN7
CN1
CN21
GM GM
CN4
DM
HEAT
ANION Y/G
BLUE
RED
HEAT_LHEAT_N
XS2
XP2
CN1 CN2
CN2
T1
WHITE
T2B
T2
BLACK
SW1 SW2 SW5
SW6 ENC1
ON
ONONON
CN19
J1J2
CN9
CN8
CN20
POWER_S
(BLUE)
(WHITE)
(RED)
(WHITE)
(WHITE)
(WHITE)
(BLUE)
(WHITE)
(RED)
(WHITE)
XT1
L1 L2
Y/G
Y/G
Z
CN13
CN17
CN16
XT2
PQ(E) XY
(E)
YELLOW XS1XP1
GROUND
GROUND
GROUND
CN14
YELLOW
CS
T2B
T2
TR
FM
XS1-7
XP1-7
T1
C
KEY
XT1-2
EEV
COMPONENT
GM
DM
INDOOR FAN
ELECTRONIC
EXPANSION VALVE
INLET AIR TEMP.
EVAP OUTLET TEMP.
(COOLING MODE)
COIL TEMP.
PLUG
JACK
TRANSFORMER
TERMINAL BLOCK
WATER LEVEL SWITCH
FAN CAPACITORFAN CAPACITOR
SWING MOTOR
PUMP MOTOR
HEAT
ANION
AUXILIARY HEATER
ANION GENERATOR

11
Figure 13. Typical VWMA024 to 030 Wiring Diagram
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
MAIN CONTROL BOARD
INDOOR UNIT POWER
208-230V
CONNECT TO
WIRED CONTROLLER CONNECT TO
OUTDOOR
UNIT
WEEKLY TIMER
TROLLER
DISPLAY BOARD
WIRED
CONTROLLER
REMOTE
ON / OFF
NOTE - Dashed line indicates optional or field-
wired components.
NOTE - If indoor unit is the final unit in a group
wired in series, install provided resistor across
terminals P and Q.
NOTE - Use 3-conductor, shielded cable for
communication wiring.
CS
T2B
T2
TR
FM
XS1-7
XP1-7
T1
C
KEY
XT1-2
EEV
COMPONENT
GM
DM
INDOOR FAN
ELECTRONIC
EXPANSION VALVE
INLET AIR TEMP.
EVAP OUTLET TEMP.
(COOLING MODE)
COIL TEMP.
PLUG
JACK
TRANSFORMER
TERMINAL BLOCK
WATER LEVEL SWITCH
FAN CAPACITORFAN CAPACITOR
SWING MOTOR
PUMP MOTOR
HEAT
AL
AUXILIARY HEATER
ALARM
FM
WHITE
WHITE(GRAY)
C
TR
Y/G
EEV
CN10 WHITE
CN15
CN5
CN3
CN24
CN1
GM GM
DM
HEAT_LHEAT_N
XS2
XP2
XS3
XP3
CN1 CN2
XS4
XP4
T1
XS6
XP6
WHITE
T2B T2
XP7
BLACK
XS7
SW1 SW2 SW5
SW6 ENC1
ON
ONON
ON
J1J2
CN9 CN8
POWER_S
(BLUE)
(WHITE)
(RED)
(WHITE)
(BLUE)
(WHITE)
(RED)
(WHITE)
XS1
XP1
ON
Y/G
L1 L2
RED
BLUE
XT1
PQXY
(E)
XT2
XP8
XS8
CN14
XS5
XP5
CN6
(YELLOW)
AL
EEV
COMON/OFF
ON/OFF
Y/G
Z
XS1 XP1
(YELLOW)
GROUND
GROUND

12
P Q
All shields of shielded cable connect to GROUND terminal, not to terminal E.
18 GA., stranded, 3-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
Outdoor unit
(main unit) Outdoor unit (sub1 unit) Outdoor unit
(sub2 unit)
(PQE) (H1 H2 E) (H1 H2 E)
(H1 H2 E)
(PQE)
MS
Box
(PQE)
Ground cable shield
DO NOT connect to E
(PQE)
MS
Box
(PQE)
Install a terminating resistor at the last indoor unit terminals P and Q of the daisy
chain and for each individual unit when connected directly to an MS Box port.
Figure 14. Typical Communication Wiring Diagram (VRF Heat Recovery System)
NOTE - Each communication wire from the MS box should follow the refrigerant piping for that port.