Lennox VVCB 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 (VVCB012)
1 - 3/8 to 1/4 adapter (VVCB012)
1 - Installation manual
5 - Zip ties
1 - Plastic cable clamp & screw
VVCB Vertical Air Handler
The VVCB 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
507895-02
01/2019
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 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 B 036 H 4 - 3 P
Brand/Family
V = Variable Refrigerant Flow (VRF)
Unit Type
VC = Air Handler Models
Major Design Sequence
B = 2nd Generation
Cooling E󰀩ciency
H = High E󰀩ciency
Refrigerant Type
4 = R-410A
Controls Protocol
3 = Phase 3
Voltage
P = 208/230V-1 phase-60hz
Nominal Cooling Capacity - Btuh
012 = 1,200 Btu/h
018 = 18,000 Btuh
024 = 24,000 Btuh
030 = 30,000 Btuh
036 = 36,000 Btuh
048 = 48,000 Btuh
054 = 54,000 Btuh
060 = 60,000 Btu/h
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 for Small Box 012-030
Dimension 012-030
inches mm
A45-3/4 1162
B19-3/4 502
C17-7/8 454
D21-5/8 549
E13-3/4 349
F18-1/2 470
G20-3/4 527
21-5/8(549)
10-1/4(260)
SUPPLY AIR
17-7/8(454)
SUPPLY AIR
1-1/4(32)
SUCTION
LINE
LIQUID
LINE
RETURN AIRRETURN AIRRETURN AIR
SUPPLY AIR
20-3/4(527)
18-1/2(470)
19-3/4(502)
45-3/4(1162)
3/4(19)
3(76)
13-3/4(349)
1-5/8(41)
CONDENSATE DRAIN
FILTER ACCESS
LINE VOLTAGE INLETS
(Top and Either Side)
LOW VOLTAGE INLETS
(Top and Either Side)
TOP VIEW
FRONT VIEW
BOTTOM VIEW
SIDE VIEW
SIDE VIEW
AIR FLOW
D
C
A
E
FG
B

4
Dimensions - inches (mm) Upow Position Shown for Big Box 036 - 060
Dimension 036-060
inches mm
A53-3/4 1365
B22 560
C19-1/2 495
D24 610
E19-1/2 495
F20-3/8 518
G22-3/4 578
F
A
G
E
LINE VOLTAGE INLETS
(Top and Either Side)
LOW VOLTAGE INLETS
(Top and Either Side)
10-1/4(260)
SUPPLY AIR
1-1/4(32)
SUCTION
LINE
LIQUID
LINE
TOP VIEW
24(610)
RETURN AIR
22-3/4(578)
SIDE VIEW
BOTTOM VIEW
RETURN AIR
SIDE VIEW
B
C
D

5
Clearances
Note - Minimum front service access - 24 inches (610 mm) minimum.
Figure 1. Clearances
AIRFLOW
HORIZONTAL INSTALLATION
VERTICAL INSTALLATION
≥ 39 38”
/
≥ 39 38”
/
≥ 39 38”
/
≥ 778”
/
≥ 778”
/
≥ 778”
/
NOTE: All dimensions
shown in inches.
(1000 mm) (1000 mm)
(200 mm)
(200 mm) (1000 mm) (200 mm)
Model No. 012-030 036-060
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 above.

6
Parts Identication
Horizontal Drain Pan
Gas Line Connection
Liquid Line Connection
Electronic Expansion Valve (EEV)
Strainer
Primary Drain Connection
Vertical Drain Pan
Auxiliary Horizontal
Auxiliary Upflow
Straps
Drip Shield Baffle
Drain Connection
Drain Connection
Figure 2. Parts Identication

7
Indoor Unit Placement
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
• Areas exposed to acids or alkaline 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
• Install 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 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 suitability of structure to which the unit support
mechanism will be xed to. If structure is not capable
of carrying the 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 su󰀨ocation.
CAUTION
Do not place items which may be damaged by water
under or around the indoor unit.

8
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 Figure 3.
• 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, a
requirement for the warranty program is that it is
installed with 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.
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 3. Locate Threaded Rods
Position the Unit
DANGER
Units must not be installed where they may be exposed
to potentially explosive or ammable atmosphere. If this
instruction is not followed
exactly, a re or explosion may result, causing property
damage, injury, or death.
Install the unit in a location that meets the following
requirements:
• Allow adequate space for installation, service
clearance, piping and electrical connections, and
necessary ductwork. For specic unit dimensions,
allow clearance according to local and national
codes.
• Unit can be installed standing vertically on a eld-
provided stand. A stand is always required to support
the weight of the unit.
• Unit can also be installed horizontally, either resting
on a eld-provided stand or suspended from the
ceiling. If suspended, conrm that the ceiling is able
to support the weight of the unit.
• If the unit is to be installed over a nished ceiling
and/or living area, building codes may require a
eld-supplied secondary condensate drain pan to be
installed under the entire unit. Consult local codes
inspector for additional information. See Figure 5.
• Select the unit position with the following points in
mind:
• The unit should be installed on a structure that
is suitable to support the total weight of the unit,
refrigerant piping and condensate.
• Proper access should be provided for maintenance
for refrigerant piping, electronic expansion valve
(EEV), electrical box, and condensate pump. See
the Clearances section for minimum clearances all
around the unit.
• The unit should not be positioned close to a wall
or similar obstruction, or in a position where the
discharge air could blow directly on the controller.
• The unit should not be positioned directly above any
obstruction.
• Make sure the unit is sloped (similar to the slope
shown in Figure 14) (horizontal or vertical) so that
the drain pan will empty completely without water
standing in the pan.
• The condensate drain should have su󰀩cient
downward slope (1 in. per 100 in.) in any horizontal
run between unit and drain.
IMPORTANT
If installed on the ceiling, be sure that the ceiling grid is
supported separately from the unit. The ceiling grid must
not be supported by any part of the unit, grille, or any
associated wiring or piping work.

9
Floor
14” (356 mm)
Allow Vertical Clearance
from Floor to Unit
Airflow Path
Figure 4. Upow Conguration
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 12. 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.
CAUTION
Do not place items which may be damaged by water
under or around the indoor unit.
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 Figure 14.
4. A typical horizontal conguration is shown in Figure 5.
5. If the unit is suspended, the entire length of the 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
connect the return and supply air plenums as required.
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.
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
• NOTE - When the unit is installed in horizontal
applications, 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.
Figure 5. Suspending Horizontal Unit

10
Horizontal-Left Conversion
1. Remove the top panel and the blower section panel.
2. Remove the T-2, T-2A 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-2A and T-2B Sensor clear overlay on black cable.
3. Remove the EEV motor from the EEV 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.
6. Remove T1 sensor knockout. See Figure 7.
Figure 6. T1, T-2 and T2B Factory Installed Sensor
Locations
(Vertical Upow and Horizontal-Right Conguration
Shown)
T-1
T-2B
T-2
Sensor Description
T1 Return Air (room) Sensor
T2 Middle of Coil Sensor
T2A Entering Coil (inlet) Sensor
T2B Leaving Coil (outlet) Sensor
Table 1. Coil Sensor Identication
T-2A
10. 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.
11. Release the wiring harness clips and ties. Carefully
remove the wiring harness.
12. Insert the wiring harness plug into the hole you cut
into the coil front plate.
9. Rotate Coil 180° and re-insert into coil compartment
so that the bottom (underside) of coil faces blower.
Figure 8. Position Cabinet in Horizontal Left
Orientation
7. Insert a rubber grommet into the hole.
8. Position cabinet in the horizontal-left orientation on a
sturdy work surface.
Figure 7. Remove T1 Sensor Knockout

11
13. Reinstall the EEV motor.
14. Route wiring harness through coil, past the blower
and into the electrical box. Do not pinch or bind wires.
Figure 9. Coil Rotated 180°
Figure 10. Secure Wire Harness with Clip
15. Relocate T-1 Sensor to be downstream of the coil to
sense room air temperature.
16. Secure T-1 sensor to top of coil. See Figure 10.
17. Re-secure the wiring harness using clips and wire
ties. Do not pinch or bind wires.
18. Reconnect the T2 and T2B sensors.
19. Reconnect the wire harness plug inside of electrical
control box.
Figure 12. Relocate T-1 Sensor
20. Turn the coil compartment cover 180° and reattach to
the unit cabinet.
Figure 11. Route Wiring Harness Through Coil and
Into Electrical Compartment
21. Reattach the blower compartment panel.

12
Refrigerant Piping Connections Field provided piping consists of two HVAC/R rated copper
lines connected to the indoor unit.
Final equipment connections must be brazed connections.
Compression or other types of ttings are not permitted for
nal connections.
Size (Btuh) Liquid Line Vapor Line
VVCB012 1/4” 1/2”
VVCB018-054 3/8” 5/8”
VVCB060 3/8” 7/8”
Table 2. Refrigerant Piping Connections
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,checkthesystem for leaksper commissioning
instructions.
WARNING

13
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.
Avoid breathing vapors or fumes from brazing operations.
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.

14
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 13. 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 Figure 13). 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 of the horizontal run.
See Figure 13. 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
insulated in order to prevent both leaks and condensation.
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.

15
Sloping The Unit
Make sure the unit is sloped (similar to the slope shown in
Figure 14) (horizontal or vertical) so that the drain pan will
empty completely without water standing in the pan.
Figure 14. 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.

16
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., 2-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 (two-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 VVCB unit receiver/display must be eld-
connected and mounted. If it is necessary to position
the receiver a distance from the unit, use the optional
extension cable kit V0CTRL93P-1 (cat # 14R84).
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.

17
Figure 15. Typical Power Wiring Diagram (VRF Heat Recovery System Shown)
Indoor units and mode selection boxes on the same
refrigeration circuit should have a common power supply
but must have an independent disconnect switch installed
adjacent to each item of equipment for servicing and
maintenance purposes. Indoor unit and mode selection
box power supply MUST not be taken from the outdoor
unit. Always follow NEC/CEC and Local Codes.
Outdoor unit (main unit)
L1 L2 L3
Outdoor unit (sub1 unit)
L1 L2 L3
Outdoor unit (sub2 unit)
L1 L2 L3
L2 L3L1
L2L1
208/230V 3Ph 60Hz
or 460V 3Ph 60Hz
Power supply
208/230V 1Ph 60Hz
Power supply
Mode Selection BoxIndoor unit Indoor unit Indoor unit
Dedicated
breaker
Service
Disconnect
L1 L2
L1 L2
Fuse
Ground
L1 L2 L3
Fuse
L1 L2 L3
Ground
L1 L2 L3
Fuse
L1 L2 L3
Ground
L1 L2 L3
Fuse
L1 L2 L3
Dedicated
breaker
Service
Disconnect
Service
Disconnect
L1 L2
Fuse
Service
Disconnect
L1 L2
Fuse
Service
Disconnect
L1 L2
Fuse

18
NOTE - Each communication wire from the MS box should follow the refrigerant piping for that port.
Figure 16. Typical Communication Wiring Diagram (VRF Heat Recovery System)
P Q
All shields of shielded cable connect to chassis GROUND terminal at MS Boxes and Indoor Units.
18 GA., stranded, 2-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
Outdoor unit Outdoor unit
(sub1 unit)
Outdoor unit
(sub2 unit)
(PQ)
(main unit)
(PQ)
MS
Box
(PQ)
(PQ)
MS
Box
(PQ)
(PQ)
(H1 H2 )(H1 H2 )(H1 H2 )
Outdoor Unit Communication Terminal Block
PQ H1 H2XYOAK1 K2
MS Box Communication
Terminal Block
PQ
Indoor Unit Communication Terminal Block
HA HB 12V COM PQ
Ground cable shield
to MS Box
and Indoor Unit chassis
Install a terminating resistor (Ω120) at the last indoor unit terminals P and Q of the daisy chain.

19
(PQ)
(PQ)
Outdoor unit
(mainunit)
Outdoor unit
(sub1unit)
Outdoor unit
(sub2 unit)
Install a terminating resistor (Ω120) at the last indoor unit terminals P and Q of the daisy chain.
P Q
All shields of shielded cable connect to
chassis GROUND terminal at Indoor Units.
18 GA., stranded, 2-conductor, shielded control wire (polarity sensitive).
Typical Wiring Diagram, NEC/CEC and Local Codes apply.
(H1 H2 )
Outdoor Unit Communication Terminal Block
PQ H1 H2XYOAK1 K2
(H1 H2 )(H1 H2 )
Indoor Unit Communication Terminal Block
HA HB 12V COM PQ
Ground cable shield
to Indoor Unit chassis
Figure 17. Typical Communication Wiring Diagram (VRF Heat Pump System)
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 3 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
IMPORTANT
DO NOT adjust DIP switch settings. Settings may
only be adjusted by a trained technician as part of
the commissioning procedures.

20
Figure 18. VVCB Typical Wiring Diagram
NOTE - Typical wiring diagram. Refer to wiring diagram on the unit for actual wiring.
XS1-6
XP1-6
T2B
XT1-2
ALARM
EEV
Indoor fan motor
Terminals
Electronic expansion valveRoom temperature sensor
Inlet of evaporator sensor
Outlet of evaporator sensor
Water level switch
Warning lamp
Pump motor
Connectors
TitleCode TitleCode
FM
CS
T2A
T1
PUMP
EEV
CN28
T2B
T1
T2A
XS4
XP4
BLUE
WHITE RED
Main Board
XS6XP6
ON/OFF
SWITCH
ALARM
PUMP
CN50
HHE interface
CN51CN51
FAN CTON
HTON
AUXH
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
RED
BLACK
XS5
XP5
XT1
BLACK
RED
Y/G
CN27
CN3 CN18 CN31 CN54 CN4
CN15
CN19
CN8
CN12
CN26 CN25 CN21
CN14 CN52
CN9
L1 L2
POWER IN
Heat
“ +5V GND +12V ”
ONLY USED
FOR TESTING
T2
BLACK
XP1
XP2
XP3
1SX
2SX
3SX
T2
Middle of evaporator Sensor
YELLOW
GRAY
WHITE
BLUE
RED
BLACK
CN17
CN30
To wired
controller
comm. bus
To outdoor/
indoor/MS
units
comm.bus
XT2
HA HB 12V COM QP
To wired
controller
power
EARTH
Display Board
CN5
CS
Error code Error Content
E0
E1
E2
E4
E5
Mode conflict
Communication error between indoor and main outdoor unit
T1(Room temperature sensor) malfunction
T2B (Outlet of evaporator sensor) malfunction
T2A (Inlet of evaporator sensor) malfunction
Error Content Error code
FE
Eb
U4
Ed
EE
F8
No address
EEV malfunction
MS self-inspection error
Outdoor unit fault
High water alarm
MS error
E6
DC fan motor error
E7
EEPROM failure
E3
T2(Middle of evaporator sensor) malfunction
D8
A0
Remote off
Emergency stop
NOTE:
1. Refer to manual for communication
wiring
2. Please use the 2-conductor shielded
twisted cable for communication
NOTE:
Component in dash line is optional or
field wiring
Y/G
Occupancy
sensor
CN1
P1P2