Lennox VRF VVCA Series User manual

1
©2017 Lennox Industries Inc. Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
Shipping and Packing List
General
Check the components for shipping damage. If you
nd any damage, immediately contact the last carrier.
Package 1 of 1 contains the following:
1 - Assembled indoor unit
2 - Condensate plugs
2 - Rubber grommets
1 - Water level switch cable
1 - 5/8 to 1/2 adapter (VVCA018)
1 - 3/8 to 1/4 adapter (VVCA018)
1 - Water level switch cable
1 - Installation manual
VVCA Vertical Air Handler
The VVCA air handler is designed for indoor installation
only. As shipped, the unit is ready for installation in upow
and horizontal-right air discharge applications. Field-
congurable for horizontal left-air discharge.
The unit has accessible electrical controls, refrigerant
piping connections and an internally mounted expansion
valve kit. This unit is also equipped with variable speed
blower motor.
Refer to the Product Specication bulletin (EHB) for the
proper use of these indoor units with specic 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 codes in any way. Consult authorities
having jurisdiction before installation.
The air handler is shipped from the factory completely
assembled. This unit is provided with anges for
connecting the supply plenum.
VRF
VRF SYSTEMS -- Air Handler
507539-05
11/2018
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.
Anyadditions,changes,or conversionsrequired inorder
for the appliance to satisfactorily meet the application
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. 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 specied in
the Product Specications (EHB) bulletin.
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.

2
Model Number Identication
V VC A 036 H 4 - 1 P
Brand/Family
V = Variable Refrigerant Flow (VRF)
Unit Type
VC = Air Handler Models
Major Design Sequence
A = 1st Generation
Cooling E󰀩ciency
H = High E󰀩ciency
Refrigerant Type
4 = R-410A
Minor Design Sequence
1 = 1st Revision
2 = 2nd Revision
3 = 3rd Revision
Voltage
P = 208/230V-1 phase-60hz
Nominal Cooling Capacity - Btuh
018 = 18,000 Btuh
024 = 24,000 Btuh
030 = 30,000 Btuh
036 = 36,000 Btuh
048 = 48,000 Btuh
054 = 54,000 Btuh
Safety Requirements
WARNING
ELECTRICAL SHOCK, FIRE, OR
EXPLOSION HAZZARD.
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
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.
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 lters can damage the units. Failure
to follow these guidelines will result in the warranty be-
ing voided.
Note - Only Lennox VRF indoor units will work with Lennox VRF outdoor units and associated mechanical equipment.
Lennox Mini Split indoor units are similar in appearance but must not be connected to a Lennox VRF refrigerant circuit.
Please refer to model numbers to conrm compatibility. Model numbers for Lennex VRF units start with a “V” and model
numbers for Lennox Mini-Splits start with a “M”.
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 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.

3
Dimensions - inches (mm) Upow Position Shown
FRONT VIEW SIDE VIEW
TOP VIEW
SUCTION
LINE
LIQUID
LINE
D
1-1/4 (32)
CONDENSATE DRAIN
B
LINE VOLTAGE INLETS
(Top and Either Side)
LOW VOLTAGE INLETS
(Top and Either Side)
C
FILTER ACCESS
AIR FLOW
A
RETURN AIR
E
SUPPLY AIR
1-5/8
(41)
3
(76)
10-1/4 (260)
3/4 (19)
F G
RETURN AIR
Dimension 018-030 036-054
in. mm in. mm
A 45-3/4 1162 53-3/4 1365
B19-3/4 502 22 560
C 17-7/8 454 19-1/2 495
D 21-5/8 549 24 610
E13-3/4 349 19-1/2 495
F 18-1/2 470 20-3/8 518
G 20-3/4 527 22-3/4 578

4
Clearances
Parts Identication
Horizontal Drain Pan
Gas Line Connection
Liquid Line Connection
Electronic Expansion Valve (EXV)
Strainer
Primary Drain Connection
Vertical Drain Pan
Auxiliary Horizontal
Auxiliary Upflow
Straps
Drip Shield Baffle
Drain Connection
Drain Connection
Model No. 18-36 48-54
Cabinet 0 inch (0 mm) 0 inch (0 mm)
To Plenum 0 inch (0 mm) 0 inch (0 mm)
To Outlet Duct within 3 feet (914 mm) 0 inch (0 mm) 0 inch (0 mm)
Service / Maintenance See Note #1
1Front service access - 24 inches (610 mm) minimum.

5
Indoor Unit Placement
In addition to clearances, the following items should be
considered:
AVOID
Do not install the unit in the following locations:
• Areas exposed to petrochemicals or petrochemical
products
• Areas exposed to salt or other corrosive materials or
caustic gasses
• Areas exposed to extreme voltage variations (such as
factories
• Tightly enclosed areas that may impede service of the
unit
• Areas exposed to fossil fuels (such as oil or gas in
kitchens)
• Areas exposed to strong electromagnetic forces
• Areasexposed toacids oralkaline detergents(laundry
rooms)
DO:
• Locate the unit so that it is not exposed to direct
sunlight
• Ensure the structural wall, oor, or ceiling 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 su󰀩cient space around unit for proper operation
and maintenance
• Installunitaminimumof3feetawayfromanyantenna,
power cord (line) radio, telephone, security system, or
intercom. Electrical interference and radio frequencies
from any of these sources may a󰀨ect operation
• Be sure to instruct customers how to properly
operate the unit (especially maintenance of air lter,
and operation procedure) by having them carry out
operations themselves while looking at the manual
provided with the controller.
WARNING
Excessive Weight Hazard - Use tow or more people
when moving and installing the unit. Failure to do so can
result in back or other type of injury.
WARNING
Danger of explosion.
Keep ammable materials and vapors, such
as gasoline, away form air handler.
Place air handler so that heating elements
are at least 18 inches (46 cm) above the
oor for a garage installation.
Failure to follow these instructions can result
in death, explosion, or re.
CAUTION
Make sure the blower motor support is tight (3-motor
mount bolts) then check to see if wheel is secured to
motor shaft before operating unit.
Motor mounting bolt
IMPORTANT
This unit is approved for installation clearance to
combustible material as stated on the unit rating plate.
Accessibility and service clearances must take
precedence over combustible material clearances.
Excessive condensation may occur if the unit is installed
in a warm, humid place. When the unit is installed in an
unconditioned space, apply sealant around
electrical wires, refrigerant piping and condensate lines
at the point where they enter the cabinet.
Apply sealant on the inside of the cabinet at the point
where the electrical wires exit through the conduit
opening.
Sealing the cabinet in this way prevents warm, moist,
unconditioned air from entering the cabinet. Warm,
moist air in the cabinet forms condensate on the cooler
control box and electrical controls.
The air handler must be installed so that free access is
allowed to the coil/lter compartment and blower/control
compartment.
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, causing
personal injury or equipment or property damage.
Check stability of wall, oor, or ceiling and 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,itmayfall,causingpersonalinjuryorequipment
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.

6
Installation
It is important to locate the unit where it can be accessed
for service in the future. Refer to unit dimensions on Page
3 for exact locations of suspension brackets, return air
and supply air openings.
• Make sure that the structural ceiling is able to support
the weight of the indoor unit. It may be necessary to
add extra support.
• Install suspension rods in the structural ceiling or
concrete slab in a suitable location.
• If the structural ceiling is constructed of concrete,
install anchors to accept four ⅜” threaded rods to
suspend the indoor unit. If the structural ceiling
includes wooden joists, use angle iron or Unistrut
channel xed securely in place to accept the ⅜”
threaded rods. See gure 1.
• Use either a mechanical lifting device or a minimum of
two people to raise the unit.
• If necessary, install a eld-provided isolation grommet
to prevent transmission of vibration from unit to
structural ceiling.
• If the unit is being installed in an application that
includes a sheet rock (plasterboard) ceiling, it is
recommended to install an access panel in a suitable
location to allow nal connection of the refrigerant
piping, condensate line and electrical connections.
• This will also allow access for future maintenance.
• For ease of installation, it is best to make any
necessary coil conguration changes before setting
the air handler in place.
Figure 2. Upow Conguration
NOTE-Whentheunitisinstalledinhorizontalapplications,
a secondary drain pan is recommended. Refer to local
codes. Adequate support must be provided to ensure
cabinet integrity. Ensure that there is adequate room
to remove service and access panels if installing in the
horizontal position.
Upow Application
1. The air handler must be supported on the bottom only
and set on a suitable base or a eld-supplied support
frame. Securely attach the air handler to the oor or
support frame.
2. If installing a unit in an vertical application, remove the
horizontal drain pan.
3. Place the unit in the desired location and properly
slope the unit, see page 11. Connect the return and
supply air plenums as required using sheet metal
screws.
4. Determine knockouts required for drain line
connections.
5. With access door removed, remove drain line opening
to install drain lines.
6. If the unit is intended to be used with an “open” return
air path, ensure there is at least 14” of clearance
below the unit.
Anchor
CONCRETE CEILING
USING ANCHORS
ANGLE IRON
ACROSS
WOODEN JOISTS
Threaded rod
Angle iron bolted
in place across
wooden joists
Wooden joist
Threaded rod
Figure 1. Locate Threaded Rods

7
Figure 3. Suspending Horizontal Unit
AIR FLOW
Secondary Drain Pan
Angle Iron or Unistrut Channel
Front View End View
Electrical Inlet Clerance
4” (102mm)
Threaded Rod
Supports must not
block service access
Horizontal Application
1. Determine knockouts required for drain line
connections.
2. With access door removed, remove drain line opening
to install drain lines.
3. Set unit so that it is sloped toward the end of the unit
with the drain pan (see gure 12).
4. A typical horizontal conguration is shown in gure 3.
5. Ifthe unit issuspended, theentire length ofthe cabinet
must be supported. If you use threaded rod, use a
piece of angle iron or Unistrut channel attached to the
unit (either above or below) to support the length of
the cabinet. Use eld-supplied 3/8 threaded nylon-
lock nuts and bolts no longer than 1/2 inch to avoid
damaging the coil or lter. Use sheet metal screws to
connectthe returnand supplyair plenumsas required.
Horizontal-Left Conversion
1. Remove the coil section panel and the blower section
panel.
2. Remove the T-2 and T-2B sensors from the sleeves.
The sensors look similar; label the sensors so that
they can be reinstalled to the proper locations.
T-2 Sensor black cable, no overlay.
T-2B Sensor clear overlay on black cable.
3. Remove the EXV motor from the EXV body.
4. Remove the T1 sensor from the factory-
provided hole in the coil housing.
The sensor will not be positioned back inside of coil
housing.
5. Slide the coil assembly out of the cabinet. Place coil
on sturdy surface.
Figure 4. T1, T-2 and T2B Factory Installed Sensor
Locations
(Vertical Upow and Horizontal-Right Conguration
Shown)
T-1
T-2
T-2B
Sensor Description
T1 Return Air (room) Sensor
T2 Middle of Coil Sensor
T2B Leaving Coil (outlet) Sensor
Table 1. Coil Sensor Identication
IMPORTANT
When removing the coil, there is a possibility of
equipment damage and personal injury. Be careful
when removing the coil assemble from a unit installed
horizontal. The coil may tip into the drain pan once it is
clear of the cabinet. Support the coil when removing it.
IMPORTANT
The horizontal drain pan is not required in vertical upow
air discharge installations. It must be removed to provide
the best e󰀩ciency and air ow.

8
10. Rotate Coil 180° and re-insert into coil compartment
so that the bottom (underside) of coil faces blower.
11. Disconnect the sensor wiring harness in the control
box (blue plug) and prepare to reroute it to allow for
connection to the sensors in their new locations.
9. Position cabinet in the horizontal-left orientation on a
sturdy work surface.
Figure 6. Position Cabinet in Horizontal Left
Orientation
Figure 7. Coil Rotated 180°
Figure 8. Disconnect Wiring Harness
12. Release the wiring harness clips and ties. Carefully
remove the wiring harness.
13. Insert the wiring harness plug into the hole you cut
into the coil front plate.
14. Reinstall the EXV motor.
15. Route wiring harness through coil, past the blower
and into the electrical box. Do not pinch or bind wires.
6. Use a 1” hole cutter bit to create a wiring passthrough
in the coil housing front panel.
7. Clean all of the burrs from the newly cut hole. Insert a
grommet into the hole.
8. Seal the factory-provided T-1 outlet hole with UL listed
foil tape.
Figure 5. Coil Assembly Field-Modied with Wiring
Cable Passthrough

9
Refrigerant Piping Connections
Field piping consists of two copper lines connected to the
indoor unit. Table 2 lists the connection sizes at the indoor
unit. Both lines must be individually insulated.
Size (Btuh) Liquid Line Vapor Line
VVCA018-054 3/8” 5/8”
Table 2. Refrigerant Piping Connections
Figure 10. Relocate T-1 Sensor
16. Relocate T-1 Sensor to be downstream of the coil to
sense room air temperature.
Figure 9. Route Wiring Harness Through Coil and
Into Electrical Compartment
17. Secure T-1 sensor to “top of coil” brace.
18. Re-secure the wiring harness using clips and wire
ties. Do not pinch or bind wires.
19. Reconnect the T2 and T2B sensors.
20. Reconnect the wire harness plug inside of electrical
control box.
21. Turn the coil compartment cover 180° and reattach to
the unit cabinet.
22. Reattach the blower compartment panel.
IMPORTANT
The compressor in the unit this air handler is matched
with contains PVE oil (Polyvinyl ether). PVE oil is
formulated for hydrouorocarbon (HFC) refrigerants,
such as R410A, 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.
Refrigerant leaks are unlikely; however, if a refrigerant
leak occurs, open a door or windows to dilute the
refrigerant in the room. Turn o󰀨 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,checkthesystemforleaksper commissioning
instructions.
WARNING
IMPORTANT
Always use two wrenches when tightening are nuts to
avoid twisting refrigerant piping. DO NOT over-tighten
are nuts.
IMPORTANT
Flared connections should always be accessible and
must be insulated to prevent condensation.
IMPORTANT
Support ALL piping within 12 in. (305 mm) of any
mechanical tting such as a ared connection.

10
Brazing Refrigerant Lines
Refrigerant lines must be connected by a qualied
technician in accordance with established procedures.
1. The seal on the unit refrigerant piping connections
should remain in place until the last possible moment.
This will prevent dust or moisture from getting into the
refrigerant piping before it is connected.
2. To avoid damaging the rubber grommets in the
cabinet while brazing, slide the rubber grommets over
the refrigerant lines until they are away from the heat
source.
3. Remove rubber plug from both liquid and gas lines or
cut pipework tails to suit eld installation conditions
4. Connect the liquid and gas lines to the evaporator coil.
5. Place a wet rag against piping plate and around the
line connections. Take care to protect the cabinet
and internal components.
6. Ensure nitrogen is owing at all times during the
brazing process.
7. Braze connections. Allow pipe to cool before removing
wet rag.
8. Reinstall the rubber grommets into the refrigerant
piping panel.
9. Insulate both pipes individually.
Sealing the Unit
Seal the unit so that warm air is not allowed into the
cabinet. Warm air introduces moisture, which results in
water blow-o󰀨 problems.
This is especially important when the unit is installed in an
unconditioned area.
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
WARNING
Danger of re. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing torch
to a pressurized system may result in ignition
of the refrigerant and oil mixture. Check the
high and low pressures before applying heat.
CAUTION
Brazing alloys and ux contain materials which are
hazardous to your health.
Avoidbreathingvaporsorfumesfrombrazingoperations.
Perform operations only in well-ventilated areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and ux.
IMPORTANT
Refrigerant lines must be clean, dry, refrigerant-grade
copper lines. Air handler coils should be installed
only with specied line sizes for approved system
combinations.
Handle refrigerant lines gently during the installation
process. Sharp bends or kinks in teh lines will cause
restrictions.
IMPORTANT
Only use brazing rods/sticks which are suitable/
recommended for air conditioning pipework installations
- Do Not Use Soft Solder.
WARNING
There must be an air-tight seal between the bottom of
the air handler and the return air plenum. Use berglass
sealing strips, caulking, or equivalent sealing method
between the plenum and the air handler cabinet to
ensure a tight seal. Return air must not be drawn from a
room where this air handler or any gas-fueled appliance
(i.e. water heater) or carbon monoxide-producing device
(i.e. wood replace) is installed.
CAUTION
Purge low pressure nitrogen [1 to 2 psig (6.0 to 12.8
kPA)] through the refrigerant piping during brazing. This
will help to prevent oxidation and the introduction of
moisture into a system.
To prevent the build-up of high levels of nitrogen when
purging be sure it is done in a well ventilated area.

11
Condensate Piping Connections
The air handler is provided with ¾” NPT condensate
drain connections.
Do not overtighten drain fitting.
Unit must be slightly inclined toward drain connection.
Unit
To approved drain
Do not operate unit without condensate drain trap.
3”
3”
Clean Out
Do not glue Anti-siphon vent must
extend above the height
of the coil drain pan by
2” (51 mm).
Figure 11. Condensate Drain Trap
1. Install properly sized, eld-provided connection
ttings and connect primary drain line to
the main drain pan connection (3/4” I.D.).
NOTE - When installing drain line connection ttings to the
drain pan, hand tighten the tting and use a thread sealant.
Over-tightening the ttings can split connections on the drain
pan.
2. If the secondary drain line is to be used, remove
the plug or the knockout and route the drain line
so that water draining from the outlet will be easily
noticed by the user. Refer to local codes for drain
trap requirements on the secondary drain line.
3. Check again to ensure drain ports and drain pan are
free of all debris.
4. Plug and check any unused drain pan openings for
tightness to prevent water leaks or seepage from the
drain pan.
5. Install a 3” trap in the main (primary) drain lines as
close to the unit as practical (see gure 11). Make
sure the top of the trap is below the connection to
the drain pan to allow complete drainage of the pan.
NOTE - Horizontal runs must have an anti-siphon air
vent(standpipe)installed ahead ofthe horizontal run.
See gure 11. An extremely long horizontal run may
require an oversized drain line to eliminate air traps.
NOTE - Do not operate air handler without a trap in
the main (primary) drain. The condensate drain is on
the negative pressure side of the blower; therefore,
air being pulled through the condensate line will not
allow positive drainage without a proper trap.
6. Route the drain line to the outside or to an
appropriate drain. Drain lines must be installed
so they do not block service access to the front
of the air handler. A 24” clearance is required for
lter, coil, or blower removal and service access.
NOTE - Check local codes before connecting the
drain line to an existing drainage system. Insulate
the drain lines where sweating could cause water
damage.
7. After the system installation is complete, the
condensate drain line must be checked for leaks
and proper drainage. If a eld-provided condensate
pump has been installed, it must be checked to
ensure proper operation. This check is part of the
commissioning sequence.
Using an External Water Level Switch
Disconnect the closed circuit loop, CN 5. Connect the
water level switch cable accessory to CN 5. See unit
wiring diagrams for location of CN 5.
The connection has 5 VDC current, do not supply eld
voltage.
IMPORTANT
Drain should have a slope of at least 1/4 inch per foot
and should be approved corrosion-resistant pipe. You
must conrm operation of every drain and pump in the
system as part of the commissioning procedure.
IMPORTANT
A eld-fabricated secondary drain pan, with a drain pipe
to the outside of the building, is required in all installa-
tions over a nished living space or any area that may
be damaged by overow from the main drain pan.
CAUTION
Make sure that drain piping is properly routed and
insulatedinordertopreventbothleaksandcondensation.
Follow these instructions exactly to ensure proper
drainage and unit operation.
IMPORTANT
You must conrm operation of every drain and pump in
the system as part of the commissioning procedure.

12
Sloping The Unit
Make sure the unit is sloped (similar to the slope shown in
gure 12) (horizontal or vertical) so that the drain pan will
empty completely without water standing in the pan.
Figure 12. Sloping the Unit
Duct System
Duct system must be designed within the range of external
static pressure the unit is designed to operate against. It is
important that the system airow be adequate. Make sure
supply and return duct, grills, special lters, accessories,
etc. are accounted for in total resistance.
Supply plenum is attached to the 3/4” duct anges supplied
with the unit. Attach anges around the blower outlet.
Secure the supply and return duct to the unit anges,
using proper fasteners for the type of duct used.
The air handler is provided with anges for the connection
of the supply plenum.
Supply and return duct system must be adequately sized
to meet the system's air requirements and static pressure
capabilities. Supply plenum should be the same size as
the anged opening provided around the blower outlet
and should extend at least 3 ft. from the air handler before
turning or branching o󰀨 plenum into duct runs. The plenum
forms an extension of the blower housing and minimizes
air expansion losses from the blower.
Field installed duct must comply with the National Fire
Protection Association NFPA 90A, NFPA 90B and any
applicable local ordinance.
Installing Duct System
• Connect supply air duct to the ange on top of the air
handler. If an isolation connector is used, it must be
nonammable.
• When sizing the return air lter grille, a minimum
surface area of 200 sq. in. per ton is recommended.
Installation Guidelines
• Install a eld-provided isolation grommet to prevent
transmission of vibration from unit to structural ceiling.
• Provide separate support for the weight of the duct
system. Duct system must not be supported by the
indoor unit.
• Use exible joints (canvas) at the point where the duct
connects to the unit on both ends. Material must meet
all local and national code requirements.
• When unit is being installed in a location where even
the slightest noise would be a problem (meeting room
or other very quiet space), design duct system to
avoid transmission of vibration to the structure to the
extent possible.
THIS CORNER SHOULD BE
5/8” (+/- 1/8”) HIGHER THAN
DRAIN CORNER
DRAIN
CORNER
THISCORNER SHOULD BE 5/8” (+/- 1/8”)
HIGHER THAN DRAIN CORNER
AIR FLOW
WARNING
Do not, under any circumstances, connect return duct to
any other heat producing device such as replace insert,
stove, etc. Unauthorized use of such of devices may
result in re, carbon monoxide poisoning, explosion,
personal injury or property damage.
IMPORTANT
If an elbow is included in the plenum close to the unit, it
must not be smaller than the dimensions of the supply
duct ange on the unit.
The front glange on the return duct if connected to the
blower casing must not be screwed into the area where
the power wiring is located. Drills or sharp screw points
can damage insulation on wires located inside unit.

13
Wiring Connections
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 - 18 GA., 3-conductor, shielded control wire
(polarity sensitive). All shields of shielded cable connect
to GROUND terminal. This is necessary to ensure proper
system communication and operation.
1. Remove the screws that secure the control box cover.
Remove the cover and place it to the side where it will
not be damaged.
2. Locate the terminal strip in the control box. Connect
the power wiring (sized per NEC/CEC and local
codes) and communications cable (three-core,
shielded cable). Refer to unit nameplate for rated
voltage.
3. If the indoor unit is the nal unit in a group that is
wired in series, install the provided resistor across
terminals P and Q.
4. The infra-red receiver / display panel is factory
installed and can be repositioned, if necessary. Use
optional extension cable kit.
IMPORTANT
DO NOT adjust DIP switch settings. Settings may only
be adjusted by a trained technician as part of the com-
missioning procedures.
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 a󰀨ect remote control
operation.
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 re.
Use specied 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 re.
Wiring must be installed so that all cover plates can be
securely closed.

14
Figure 13. VVCA018-054H4-1 Wiring Diagram
CN1
F M
TR
T1
WHITE
T2B
T2
BLACK
GREEN
SW1 SW 2
SW5 SW6
ENC 1
J1 O N
ON
ON
O N
CN 1 1 CN5
CN7 C N8
EEV
CN6
CN2 0 CN1 5（WHITE）C N1 0（Y EL L OW）
CN13
PUMP
XS2
XP2
XS3XP3
RED
BLACK
Y/G
DISPLAY BOARD
MAIN CONTROL BOARD
WIRE D
CONT ROL L ER
W IR E D
C ON T ROLL ER
CN16
CN 3
ALARM
CS
XS4XP4
C N1 2
CN 9
CN1 7
XT2
P Q (E)X Y (E)
INDOORPOWER
XT1
L1
L2
POWER_S
XS1 XP1
WEEKLY TIMER
WIRED CONTROLLER
NOTE
COMPONENT IN DASH
LINE IS OPTIONAL
OR FIELD WIRING
：
WATER LEVEL SWITCH
PUMP MOTOR
EEV
T2B
T2
TR
FM
XS1-10
XP1-10
T1
XT1-2
PUMP
CS
KEY
COMPONENT
INDOOR FAN
ELECTRONIC
EXPANSION VALVE
INLET AIR TEMP.
COILTEMP.
TRANSFORMER
TERMINAL BLOCK
EVAP OUTLET TEMP
IN COOLING MODE
PLUG
JACK
CO N TR OL INTERFACE
MO D UL E
GROUND GROUND
GROUND
P1
CN2 7
CN2 8
P2
CN3 1
XS5
XP5
CONNECT TO
WIRED CONTROLLER
NOTE 1: R EFE R T O M A NUAL FO R
CO MMUNICATION WI RIN G
2: PLEA SE U S E THE
3- CONDUCTO R
SH IELDED CA BLE
CONNE C T TO
OUT DO O R UNIT
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.

15
Figure 14. VVCA018-054H4-2 Wiring Diagram
ALARM
FO/NO F
L2
NOTE
COMPONENT IN DASH
LINE IS OPTIONAL
OR FIELD WIRING
WATER LEVEL SWITCH
PUMP MOTOR
EEV
T2B
T2
TR
FM
XS1-10
XP1-10
T1
XT1-2
PUMP
CS
KEY
COMPONENT
INDOOR FAN
ELECTRONIC
EXPANSION VALVE
INLETAIR TEMP.
COIL TEMP.
TRANSFORMER
TERMINAL BLOCK
EVAP OUTLET TEMP
IN COOLING MODE
PLUG
JACK
REMOTE ON/OFF
FAN CTON HTON AUXH
HHEinterface
Currentrange(0~1A)
Voltagerange(0~AC/DC24V)
Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.

16
PQE Communicaon wiring
L1/L2/L3 Three-Phase power wiring
Electrical disconnect switch
Legend
Power Distribuon Box
L1/L2/L3
MS
Box
MS
Box
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
L1/L2
PQE
PQE
PQE
PQE
L1/L2
L1/L2
L1/L2
L1/L2
PQE
PQE
PQE
PQE PQE
L1/L2/L3
L1/L2/L3
L1/L2
L1/L2 Single-Phase power wiring
PQE
PQE
Figure 15. Typical Power Wiring Diagram (VRF Heat Recovery System Shown)
Indoor units and MS boxes on the same refrigeration
circuit should have a common power supply but must
have an independent disconnect switch installed adjacent
to the fan coil for servicing and maintenance purposes.
Indoor unit and MS box power supply MUST not be taken
from the outdoor unit. Always follow NEC/CEC and Local
Codes.

17
NOTE - Each communication wire from the MS box should follow the refrigerant piping for that port.
Tightening torque for the terminal screws
• Use the correct screwdriver for ghting the terminal
screws. If the screwdriver blade is too small, the head
of the screw might be damaged, and the screw will
not be properly tightened.
• If the terminal screws are over tightened, screws
might be damaged.
• Refer to the table below for the tightening torque of
the terminal screws.
• After wiring, conrm all connections are correct; Then
turn on power supply to the unit.
Table 3. Terminal Screw Tightening Torque
Tightening torque
(lb-ft)
Terminal base of
remote controller/Signal
transmission wire (X2M)
0.58-0.72
Terminal base of power
supply (X1M)
0.87-1.06
Grounding terminal (M4) 1.06-1.43
Figure 16. Typical Communication Wiring Diagram (VRF Heat Recovery System)
Install a terminating resistor at terminals P and Q for each individual unit
when connected directly to an MS Box port.
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)
(H1H2E)(H1H2E)(H1H2E)
(PQE) (PQE)(PQE)
(PQE)
(PQE) (PQE)
(PQE) (PQE)
(PQE) (PQE)
(PQE)
Ground cable shield
DO NOT connect to E
Mode
Selection
Box
Mode
Selection
Box

18
(PQE)
(PQE) Ground cable shield
DO NOT connect to E
Outdoor unit
(mainunit) Outdoor unit (sub1unit) Outdoor unit (sub2 unit)
(H1 H2 E) (H1 H2 E) (H1 H2 E)
Install a terminating resistor at the last indoor unit terminals P and Q of the daisy
chain.
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.
Figure 17. Typical Communication Wiring Diagram (VRF Heat Pump System)
NOTE – PQE Communication wiring is daisy-chained from the outdoor unit to each indoor unit in one continuous run.

19
ELECTRIC HEAT DATA 018-036
VVCA018H4
Description Input Blower Motor Full Load
Amps
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection
Blower Speed
Low Medium High
Volt kW 1Btuh
5 kW V8EH0050P-1P (13P59) 208 3.8 12,800 3.0 26.8 30 • • •
220 4.2 14,300 3.0 27.8 30 • • •
230 4.6 15,700 3.0 28.8 30 • • •
240 5.0 17,100 3.0 29.8 30 • • •
7.5 kW V8EH0080P-1P (13P63) 208 5.6 19,200 3.0 37.8 440 5- - - • •
220 6.3 21,500 3.0 39.8 440 5- - - • •
230 6.9 23,500 3.0 41.8 45 5- - - • •
240 7.5 25,600 3.0 42.8 45 5- - - • •
VVCA024H4
Description Input Blower Motor Full Load
Amps
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection
Blower Speed
Low Medium High
Volt kW 1Btuh
5 kW V8EH0050P-1P (13P59) 208 3.8 12,800 3.0 26.8 30 • • •
220 4.2 14,300 3.0 27.8 30 • • •
230 4.6 15,700 3.0 28.8 30 • • •
240 5.0 17,100 3.0 29.8 30 • • •
7.5 kW V8EH0080P-1P (13P63) 208 5.6 19,200 3.0 37.8 440 5- - - • •
220 6.3 21,500 3.0 39.8 440 5- - - • •
230 6.9 23,500 3.0 41.8 45 5- - - • •
240 7.5 25,600 3.0 42.8 45 5- - - • •
10 kW V8EH0100P-1P (13P64) 208 7.5 25,600 3.0 48.8 450 5- - - • •
220 8.4 28,700 3.0 51.8 60 5- - - • •
230 9.2 31,400 3.0 53.8 60 5- - - • •
240 10.0 34,100 3.0 55.8 60 5- - - • •
VVCA030H4
Description Input Blower Motor Full Load
Amps
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection
Blower Speed
Volt kW 1Btuh Low Medium High
5 kW V8EH0050P-1P (13P59) 208 3.8 12,800 3.0 26.8 30 • • •
220 4.2 14,300 3.0 27.8 30 • • •
230 4.6 15,700 3.0 28.8 30 • • •
240 5.0 17,100 3.0 29.8 30 • • •
7.5 kW V8EH0080P-1P (13P63) 208 5.6 19,200 3.0 37.8 440 5- - - • •
220 6.3 21,500 3.0 39.8 45 5- - - • •
230 6.9 23,500 3.0 41.8 45 5- - - • •
240 7.5 25,600 3.0 42.8 45 5- - - • •
10 kW V8EH0100P-1P (13P64) 208 7.5 25,600 3.0 48.8 450 5- - - • •
220 8.4 28,700 3.0 51.8 60 5- - - • •
230 9.2 31,400 3.0 53.8 60 5- - - • •
240 10.0 34,100 3.0 55.8 60 5- - - • •
NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.
1 Electric heater capacity only - does not include additional blower motor heat capacity.
2 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167°F.
3 HACR type breaker or fuse.
4 Bold text indicates that the circuit breaker on CB” circuit breaker models must be replaced with size noted. See Table on page <OV>.
5 Do not operate fan on low speed when V8EH Electric Heat Kit is used with VVCA air handler.

20
VVCA048H4, VVCA054H4
Description
Input Blower
Motor
Full
Load
Amps
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection
5Single Point
Power Source Blower Speed
Volt kW 1Btuh Ckt 1 Ckt 2 Ckt 1 Ckt 2
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection Low Medium High
5 kW V8EH0050P-1P
(13P59)208 3.8 12,800 4.2 28.3 - - - 430 - - - - - - - - - • • •
220 4.2 14,300 4.2 29.3 - - - 430 - - - - - - - - - • • •
230 4.6 15,700 4.2 30.3 - - - 35 - - - - - - - - - • • •
240 5.0 17,100 4.2 31.3 - - - 35 - - - - - - - - - • • •
7.5 kW V8EH0080P-1P
(13P63)208 5.6 19,200 4.2 39.3 - - - 440 - - - - - - - - - • • •
220 6.3 21,500 4.2 41.3 - - - 45 - - - - - - - - - • • •
230 6.9 23,500 4.2 42.3 - - - 45 - - - - - - - - - • • •
240 7.5 25,600 4.2 44.3 - - - 45 - - - - - - - - - • • •
10 kW V8EH0100P-1P
(13P64)208 7.5 25,600 4.2 50.3 - - - 60 - - - - - - - - - • • •
220 8.4 28,700 4.2 53.3 - - - 60 - - - - - - - - - • • •
230 9.2 31,400 4.2 55.3 - - - 60 - - - - - - - - - • • •
240 10.0 34,100 4.2 57.3 - - - 60 - - - - - - - - - • • •
15 kW V8EH0150P-1P
(13P75)208 11.3 38,400 4.2 50.3 23 60 425 73.3 80 6- - - • •
220 12.6 43,000 4.2 53.3 24 60 425 77.3 80 6- - - • •
230 13.8 47,000 4.2 55.3 25 60 425 80.3 90 6- - - • •
240 15.0 51,000 4.2 57.3 26 60 30 83.3 90 6- - - • •
20 kW V8EH0200P-1P
(13P76)208 15.0 51,200 4.2 50.3 45 60 450 95.3 100 6- - - • •
220 16.8 57,300 4.2 53.3 48 60 450 101.3 110 6- - - • •
230 18.4 62,700 4.2 55.3 50 60 450 105.3 110 6- - - • •
240 20.0 68,200 4.2 57.3 52 60 60 109.3 110 6- - - • •
ELECTRIC HEAT DATA 036-054
VVCA036H4
Description Input Blower Motor Full Load
Amps
2Minimum
Circuit
Ampacity
3Maximum
Overcurrent
Protection
Blower Speed
Volt kW 1Btuh Low Medium High
5 kW V8EH0050P-1P (13P59) 208 3.8 12,800 4.2 28.3 430 • • •
220 4.2 14,300 4.2 29.3 430 • • •
230 4.6 15,700 4.2 30.3 35 • • •
240 5.0 17,100 4.2 31.3 35 • • •
7.5 kW V8EH0080P-1P (13P63) 208 5.6 19,200 4.2 39.3 440 • • •
220 6.3 21,500 4.2 41.3 45 • • •
230 6.9 23,500 4.2 42.3 45 • • •
240 7.5 25,600 4.2 44.3 45 • • •
10 kW V8EH0100P-1P (13P64) 208 7.5 25,600 4.2 50.3 60 6- - - • •
220 8.4 28,700 4.2 53.3 60 6- - - • •
230 9.2 31,400 4.2 55.3 60 6- - - • •
240 10.0 34,100 4.2 57.3 60 6- - - • •
REPLACEMENT CIRCUIT BREAKERS
Voltage Description Catalog No.
208/240V - 1
Phase 25 amp, 2 pole 41K13
30 amp, 2 pole 17K70
40 amp, 2 pole 49K14
50 amp, 2 pole 41K12
NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower
Motor Full Load Amps.
1 Electric heater capacity only - does not include additional blower motor heat
capacity.
2 Refer to National or Canadian Electrical Code manual to determine wire, fuse
and disconnect size requirements. Use wires suitable for at least 167°F.
3 HACR type breaker or fuse.
4 Bold text indicates that the circuit breaker on CB” circuit breaker models must
be replaced with size noted. See Table on page <?>.
5Single point power source breaker for unit with 15 and 20 kW electric heat is
not furnished and must be eld provided.
6 Do not operate fan on low speed when V8EH Electric Heat Kit is used with
VVCA air handler.