Carrier 40VML007-024 User manual
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 20-40VML001-02 Printed in U.S.A. Form 40VML-3SI Pg 1 08-20 Replaces: 40VML-2SI
Installation and Maintenance Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Step 1 — Unpack and Inspect Units . . . . . . . . . . . . . . 7
Step 2 — Position the Unit . . . . . . . . . . . . . . . . . . . . . . 8
Step 3 — Mount the Unit. . . . . . . . . . . . . . . . . . . . . . . . 8
Step 4 — Connect Piping . . . . . . . . . . . . . . . . . . . . . . . 9
Step 5 — Complete Electrical Connections . . . . . . . 10
Step 6 — Position and Connect Controller . . . . . . . . 12
ACB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Pre-Start Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Drain Pump and Drainage Test . . . . . . . . . . . . . . . . . 15
System Operation Check . . . . . . . . . . . . . . . . . . . . . . 15
MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
INDOOR UNIT ADDRESSING . . . . . . . . . . . . . . . . 16
Wireless Remote Controller (40VM900001) . . . . . . . 16
Non-Programmable Controller . . . . . . . . . . . . . . . . 16
Programmable Controller . . . . . . . . . . . . . . . . . . . . 17
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 18
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
APPENDIX A — DIP SWITCH SETTINGS . . . . . . . . 20
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock,
or other conditions that may cause death, personal injury or
property damage. The qualified installer or agency must use
factory-authorized kits or accessories when modifying this
product.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes and the current editions of the National
Electrical Code (NEC) ANSI/NFPA (American National
Standards Institute/National Fire Protection Association) 70. In
Canada, refer to the current editions of the Canadian Electrical
Code CSA (Canadian Standards Association) C22.1.
Understand the signal words — DANGER, WARNING, and
CAUTION. DANGER identifies the most serious hazards,
which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which would result in minor personal injury or product and
property damage.
Recognize safety information. This is the safety-alert
symbol ( ). When this symbol is displayed on the unit and in
instructions or manuals, be alert to the potential for personal
injury. Installing, starting up, and servicing equipment can be
hazardous due to system pressure, electrical components, and
equipment location.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all
disconnect locations to alert others not to restore power
until work is completed.
WARNING
When installing the equipment in a small space, provide
adequate measures to avoid refrigerant concentration
exceeding safety limits due to refrigerant leak. In case of
refrigerant leak during installation, ventilate the space
immediately. Failure to follow this procedure may lead to
personal injury.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and
goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from
system using high-pressure and low pressure ports.
c. Traces of vapor should be displaced with nitrogen
and work area should be well ventilated. Refrigerant
in contact with an open flame produces toxic gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit. Use a pan to catch
any oil that may come out of the lines and as a gage
for how much oil to add to the system.
e. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Failure to follow these procedures may result in personal
injury or death.
WARNING
The equipment and its ducting (supply and return air
ducts) are intended for use in one room only. Do not
install ductwork from a single unit to multiple rooms.
40VML007-024
Low Static Duct Indoor Unit for
Variable Refrigerant Flow (VRF) Systems
2
GENERAL
The 40VML low static ducted indoor fan coil unit offers simple
operation and long service with proper installation, operation,
and regular maintenance.
The equipment is initially protected under the manufacturer’s
standard warranty; however, the warranty is provided under the
condition that the steps outlined in this manual for initial
inspection, proper installation, regular periodic maintenance,
and everyday operation of the unit be followed in detail. This
manual should be fully reviewed in advance before initial
installation, start-up, and any maintenance. Contact your local
sales representative or the factory with any questions before
proceeding.
See Fig. 1 for model number nomenclature. Table 1 shows
components that may or may not be used for a particular
installation. Table 2 lists physical data for each unit size. Fig. 2
shows unit dimensions. Figs. 3-7 show fan performance
curves.
Fig. 1 — Model Number Nomenclature
Table 1 —Components Shipped With Unit
WARNING
The ducting for the 7K (40VMM007--3) and 9K
(40VMM009--3) (supply and return air ducts) is
intended for use in one room only. Do not install
ductwork from a single unit to multiple rooms for these
two models.
CAUTION
DO NOT re-use compressor oil or any oil that has been
exposed to the atmosphere. Dispose of oil per local codes
and regulations. DO NOT leave refrigerant system open to
air any longer than the actual time required to service the
equipment. Seal circuits being serviced and charge with
dry nitrogen to prevent oil contamination when timely
repairs cannot be completed. Failure to follow these
procedures may result in damage to equipment. For
information about replacement oil type and viscosity, see
the Installation, Start-Up, and Service Instructions for the
38VMAH and 38VMAR outdoor units.
NAME OF ACCESSORY OUTLINE QUANTITY USAGE
PQE connection wire 2 Connect outdoor unit, indoor unit, and sub MDC
Pipe insulation material 2 Heat insulation
Condensate connection 1 For drainage
Clamp 1 Connect the drain hose to condensate connection
Copper nut 1 Use for pipe connection
LED display panel 1 Operation and error display
Copper pipes 2 Use for inlet and outlet connection
Connecting wire 1 For occupancy sensor
No Beep Harness 1 Prevent beeping noise
LEGEND
VRF — Variable Refrigerant Flow
40 VM L007 - - - 3
Equipment Type
0404—
Indoor Unit
Product Type
VM — VRF
Volta ge (V-Ph-Hz)
3 — 208/230-1-60
Blank
Model Type
L — Low Static Duct
Capacity (Btuh)
007 — 7,000
009 — 9,000
012 — 12,000
018 — 18,000
015 — 15,000
024 — 24,000
a40-1873
MANUAL OPERATION TIMER DEF./FAN ALARM
LEGEND
MDC — Multiport Distribution Controller
3
Table 2 — 40VML Physical Data
UNIT 40VML 007 009 012 015 018 024
POWER SUPPLY (V-Ph-Hz) 208/230-1-60
COOLING CAPACITY (Btuh)
Total 7,100 9,130 12,170 15,210 18,250 24,340
Sensible 5,130 6,020 7,680 9,800 11,610 15,240
HEATING CAPACITY (Btuh) 8,000 10,000 13,500 17,000 21,000 27,000
INDOOR FAN MOTOR DC
Type
Input (W) 25 32 43 56 68
INDOOR COIL
Number of Rows 2
Fin Spacing (fins/in.) 17 20
Fin Type Hydrophilic Aluminum
Tube Diameter, OD (in.) 0.276
Tube Type Inner Groove
Number of Circuits 4
INDOOR AIRFLOW (cfm)
Low 224 236 306 353 471
Medium 253 294 367 424 565
High 283 353 459 530 701
INDOOR EXTERNAL STATIC PRESSURE
(High), in. wg 0-0.20
INDOOR NOISE LEVEL (dBA)
Low 31.4 31.0 33.0 33.2 36.0 37.0
Medium 32.0 34.6 35.2 38.0 38.8
High 34.0 34.5 37.0 36.7 40.2 41.3
UNIT
Unit Dimensions, W x H x D (in.) 30- 3/4 x 8-1/4 x 19-3/439-1/4 x 8-1/4 x 19-3/448 x 8-1/4 x 19-3/4
Packing Dimensions, W x H x D (in.) 36-1/4 x 11-1/2 x 22 44-7/8 x 11-1/2 x 22 53-1/2 x 11-1/2 x 22
Shipping Weight (lb) 57.5 88 115
Net Weight (lb) 41.0/48.5 48.5/57.5 59.5/71.5
FILTER
Dimensions L x H x D (in.) 23-3/8 x 7-5/8 x 3/832 x 7-3/4 x 3/840-3/4 x 7-3/4 x 3/8
Qty 1
REFRIGERANT TYPE R-410A
EXPANSION DEVICE EEV
DESIGN PRESSURE, High/Low (psig) 580/320
REFRIGERANT PIPING (in.)
Liquid Side O.D. 1/43/8
Suction Side O.D. 1/25/8
CONNECTING WIRING
Power Wiring Sized per NEC and Local Codes Based on Nameplate Electrical Data
Signal Wiring 2-core stranded shielded cable 18 AWG
CONDENSATE DRAIN PIPE DIAMETER,
OD (in.) 1
LEGEND
AWG —American Wire Gage
EEV —Electronic Expansion Valve
NEC —National Electrical Code
4
DIMENSIONS
NOTE: All dimensions shown in inches.
Fig. 2 —40VML007-024 Dimensions
40VML UNIT SIZE DIMENSION (in.)
A B C D E F G H J K L N P
007-012 27-1/2
8-1/419 3/417 3/4
30-3/4
1-3/4
20-1/8
5/8 5-3/4
23-5/87-3/429-1/8
13-3/4
015-018 36-1/439-3/828-7/832-1/47-7/8
37-3/4
024 44-7/848 37-5/841 46-1/2
AIR FILTER
ELECTRICAL
CONTROL
BOX
SIDE VIEW
FRONT VIEWREAR VIEW
BOTTOM VIEW
P
TOP VIEW
SUSPENSION BRACKETS (4)
P
N
3/4 (20)3/4 (20)
SUSPENSION
BRACKETS (4)
FRESH AIR INTAKE
3-5/8 (92) Diameter
C
D
B
F
A
E
G
H
JSUPPLY AIR OPENING
K
L
GAS
PIPE
LIQUID
PIPE
DRAIN
CONNECTION
AIRRETURN
OPENING
AIR FILTER
1-3/8 (35) 1-3/8 (35
)
BOTTONOPTIONAL
OPENINGAIRRETURN
5
FAN CURVES
Fig. 3 —Size 007-009 Fan Curves Fig. 4 —Size 012 Fan Curves
ESP FAN
SPEED
RANGE OF AVAILABLE AIRFLOW RATE IN
H-SPEED
Max Point Mid Point Min Point
Max
CFM
SP
(in.)
Mid
CFM
SP
(in.)
Min
CFM
SP
(in.)
0.04 H 325 0.02 283 0.04 241 0.06
0.08 H 325 0.06 283 0.08 241 0.10
0.12 H 325 0.08 283 0.12 241 0.15
0.16 H 325 0.12 283 0.16 241 0.19
0.20 H 325 0.15 283 0.20 241 0.23
LEGEND
ESP —External Static Pressure
H-S —High Speed
L-S —Low Speed
M-S —Medium Speed
SP —Static Pressure
0
0.04
0.08
0.12
0.2
0.16
0.24
150 200 250 300 350
Lower limit of ESP
(Min. ESP)
Fan Curve Characteristics
Airflow (cfm)
External Static Pressure (in. wg)
H-S
M-S
L-S
283
(R
r limiLowe
ating ESP)
t of ESP
(Rating E
Upper limit of ESP
SP)
(M
Low
ax ESP)
er limit of ESP
P
Upper limit of ESP
)
(
per lim
(Min.ES
Up
Max ESP)
it of ESP
H-S
M-S
L-S
H-S
M-S
L-S
ESP FAN
SPEED
RANGE OF AVAILABLE AIRFLOW RATE IN
H-SPEED
Max Point Mid Point Min Point
Max
CFM
SP
(in.)
Mid
CFM
SP
(in.)
Min
CFM
SP
(in.)
0.04 H 406 0.00 353 0.04 300 0.07
0.08 H 406 0.04 353 0.08 300 0.11
0.12 H 406 0.08 353 0.12 300 0.15
0.16 H 406 0.10 353 0.16 300 0.20
0.20 H 406 0.14 353 0.20 300 0.23
LEGEND
ESP —External Static Pressure
H-S —High Speed
L-S —Low Speed
M-S —Medium Speed
SP —Static Pressure
0
0.04
0.08
0.12
0.2
0.16
0.24
150 200 250 300 350 400 450
353
Fan Curve Characteristics
Airflow (cfm)
External Static Pressure (in. wg)
H-S
M-S
L-S
L-S
M-S
H-S
Lower limit of ESP
(Min. ESP)
(Rat
Low
ing ES
er limit of ESP
P)
(
(Rating E
Upper limit of ESP
SP)
M
Low
ax ESP)
er limit of ESP
(Min
(
.ESP
Upper limit of ESP
)
M
Upper
ax ESP)
limit of ESP
L-S M-S H-S
6
Fig. 5 —Size 0015 Fan Curves
ESP FAN
SPEED
RANGE OF AVAILABLE AIRFLOW RATE IN
H-SPEED
Max Point Mid Point Min Point
Max
CFM
SP
(in.)
Mid
CFM
SP
(in.)
Min
CFM
SP
(in.)
0.04 H 528 0.01 459 0.04 390 0.07
0.08 H 528 0.05 459 0.08 390 0.11
0.12 H 528 0.08 459 0.12 390 0.15
0.16 H 528 0.12 459 0.16 390 0.19
0.20 H 528 0.16 459 0.20 390 0.23
LEGEND
ESP —External Static Pressure
H-S —High Speed
L-S —Low Speed
M-S —Medium Speed
SP —Static Pressure
0
0.04
0.08
0.12
0.16
0.2
0.24
0.28
200 250 300 350 400 450 500 550 600
H-S
H-S
H-S
M-S
M-S
M-S
L-S
L-S
L-S
Fan Curve Characteristics
Airflow (cfm)
External Static Pressure (in. wg)
459
Lower limit of ESP
(Min. ESP)
Lowe
SP)
r limit of ESP
(Rating E
(Rating
Upper limit of ESP
ESP)
(
r lim
M
Low
ax
e
ESP)
it of ESP
(Min.
(
per lim
ESP
Upper limit of ESP
)
Up
Max ESP)
it of ESP
Fig. 6 —Size 018 Fan Curves
ESP FAN
SPEED
RANGE OF AVAILABLE AIRFLOW RATE IN
H-SPEED
Max Point Mid Point Min Point
Max
CFM
SP
(in.)
Mid
CFM
SP
(in.)
Min
CFM
SP
(in.)
0.04 H 610 0.00 530 0.04 451 0.07
0.08 H 610 0.04 530 0.08 451 0.11
0.12 H 610 0.08 530 0.12 451 0.16
0.16 H 610 0.12 530 0.16 451 0.20
0.20 H 610 0.16 530 0.20 451 0.24
LEGEND
ESP —External Static Pressure
H-S —High Speed
L-S —Low Speed
M-S —Medium Speed
SP —Static Pressure
0
0.04
0.08
0.12
0.2
0.16
0.24
0.28
250 350 450 550 650
Fan Curve Characteristics
Airflow (cfm)
External Static Pressure (in. wg)
530
H-S
H-S
H-S
M-S
M-S
M-S
L-S
L-S
L-S
Lower limit of ESP
(Min. ESP)
Low
SP)
er limit of ESP
(Rating E
(Rating
Upper limit of ESP
ESP)
(M
Low
ax ESP)
er limit of ESP
ESP)
Upper limit of ESP
(
er lim
(Min.
M
Upp
ax ESP)
it of ESP
7
Fig. 7 —Size 024 Fan Curves
NOTES for Figs. 3 through 7:
1. There are multiple ESP settings available for each ducted
unit.
2. All fan curves show examples of fan characteristics of the
"MAX. ESP," "RATING ESP," and "MIN. ESP" settings;
these curves are shown for High (H), Medium (M), and
Low (S) speeds, as selected by the user at the controller.
3. All tables show air flows at “H-Speed” for each ESP
setting. ESP settings are listed in the first column of each
table.
4. Please select ESP setting according to connected
ductwork system.
5. Please refer to Wired Controller manual for details on
static pressure settings.
INSTALLATION
Step 1 — Unpack and Inspect Units
Units are packaged for shipment to avoid damage during
normal transit and handling. It is the receiving party’s
responsibility to inspect the equipment upon arrival. Any
obvious damage to the carton and/or its contents should be
reported on the bill of lading and a claim should be filed with
the transportation company and the factory. Unit should always
be stored in a dry place, and in the proper orientation as marked
on the carton.
After determining the condition of the carton exterior, carefully
remove each unit from the carton and inspect for hidden
damage. Check to make sure that items such as accessory kit,
thermostats, controller, etc. are accounted for whether
packaged separately or shipped at a later date. Any hidden
damage should be recorded, a claim should be filed with the
transportation company, and the factory should be notified. In
the event a claim for shipping damage is filed, the unit,
shipping carton, and all packing must be retained for physical
inspection by the transportation company. All units should be
stored in the factory shipping carton with internal packaging in
place until installation.
PROTECTING UNITS FROM DAMAGE — Do not apply
force or pressure to the coil, piping, or drain stub-outs during
handling. All units should be handled by the chassis or as close
as possible to the unit mounting point locations.
The unit must always be properly supported. Temporary
supports used during installation or service must be adequate to
hold the unit securely. To maintain warranty, protect units
against hostile environments (such as rain, snow or extreme
temperature), theft, vandalism, and debris on jobsite.
Equipment covered in this manual is not suitable for outdoor
installations. Do not allow foreign material to fall into drain
pan. Prevent dust and debris from being deposited on motor,
fan wheels and coils. Failure to do so may have serious adverse
effects on unit operation and in the case of motor and blower
assembly, may result in immediate or premature failure. Failure
of any unit caused by deposits of foreign material on the motor
or blower wheels will not be covered by the manufacturer’s
warranty. Some units and/or job conditions may require some
form of temporary covering during construction.
PREPARING JOBSITE FOR UNIT INSTALLATION —
To save time and to reduce the possibility of costly errors, set
up a complete sample installation in a typical room at job-site.
Check all critical dimensions such as pipe, wire, and duct
connections requirements. Refer to job drawings and product
dimension drawings as required. Instruct all trades in their parts
of the installation. Units must be installed in compliance with
all applicable local code requirements.
IDENTIFYING AND PREPARING UNITS — Be sure
power requirements match available power source. Refer to
unit nameplate and wiring diagram. In addition:
• Check all tags on unit to determine if shipping screws are
to be removed. Remove screws as directed.
• Rotate the fan wheel by hand to ensure that the fan is
unrestricted and can rotate freely. Check for shipping
damage and fan obstructions. Adjust blower motor as
required.
ESP FAN
SPEED
RANGE OF AVAILABLE AIRFLOW RATE IN
H-SPEED
Max Point Mid Point Min Point
Max
CFM
SP
(in.)
Mid
CFM
SP
(in.)
Min
CFM
SP
(in.)
0.04 H 610 0.00 530 0.04 451 0.07
0.08 H 610 0.04 530 0.08 451 0.11
0.12 H 610 0.08 530 0.12 451 0.16
0.16 H 610 0.12 530 0.16 451 0.20
0.20 H 610 0.16 530 0.20 451 0.24
LEGEND
ESP —External Static Pressure
H-S —High Speed
L-S —Low Speed
M-S —Medium Speed
SP —Static Pressure
0
0.04
0.08
0.12
0.16
0.2
0.24
300 400 500 600 700 800 900
Fan Curve Characteristics
Airflow (cfm)
External Static Pressure (in. wg)
700
H-S
H-S
H-S
M-S
M-S
M-S
L-S
L-S
L-S
Lower limit of ESP
(Min. ESP)
(Rating E
Low
S
er limit of ESP
P)
(Rating E
Upper limit of ESP
SP)
(M
r liLow
ax E
e
SP)
mit of ESP
ESPUpper limit of
P)
(M
(Min.ES
ax ESP
Upper limit of ESP
)
CAUTION
To avoid equipment damage, do not lift unit by the drain
pipe or refrigerant piping. Unit should be lifted using the
mounting brackets.
8
Step 2 — Position the Unit
Install the unit in a location that meets the following
requirements:
• Allow adequate space for installation, service clearance,
piping, electrical connections, and necessary ductwork.
For specific unit dimensions, refer to Table 2 and Fig. 2.
Allow clearance according to local and national codes.
• Confirm that the ceiling is able to support the weight of
the unit. See Table 2 for nominal weight.
• There should be enough room within the false ceiling for
installation and maintenance. See Fig. 8.
• The false ceiling should be horizontal and level.
• Install the unit in a location within the room that allows
uniform air flow in all directions.
Fig. 8 —False Ceiling Installation
Select the unit position with the following points in mind:
• The unit should be installed in a position that is suitable
to support the total weight of the unit, refrigerant piping,
and condensate.
• Proper access should be provided for maintenance of
refrigerant piping, EEV (electronic expansion valve),
electrical box, and condensate pump. A two-foot
clearance is recommended all around the unit.
• The unit should not be positioned directly above any
obstruction.
• The unit must be installed square and level.
Step 3 — Mount the Unit
INSTALLING HANGER BOLTS — Install the hanger
bolts at the locations shown in Fig. 2. Use 3/8-inch all-threaded
rod. For unit weight, see Table 2.
MOUNTING THE UNIT — Lift the unit on to the hanging
rods for mounting:
1. Use rods and fasteners to suspend the unit at the factory-
provided mounting holes.
2. Adjust the height of the unit until the bottom is level with
the false ceiling. There must be adequate space to provide
enough pitch for the drain.
3. Secure the unit in position with locknuts and washers on
both sides of the mounting bracket. Ensure that the
threaded rod does not protrude more than two inches
below the mounting brackets as shown in Fig. 9.
INSTALLING THE DUCT — Connect the return and supply
ducts to the duct collars provided on the unit. Adequate
distance between the return and supply diffusers should be
maintained to avoid short circulation of air within the space.
The filter is located on the return side of the unit, on the rear or
bottom, depending on the return air inlet arrangement.
RETURN AIR ARRANGEMENT — Based on the return air
arrangement requirement in the field, the unit can be modified
from rear return to bottom return. Follow the instructions
below to change the return air arrangement.
Remove Air Filter Frame and Cover Plate
1. Remove the screws that secure the filter frame to the rear
of the unit.
2. Remove the screws that secure the return air cover plate
to the bottom of the unit and set the cover plate aside. See
Fig. 10.
Fig. 10 —Removing Air Filter Frame and Cover
Plate
DANGER
Units must not be installed where they may be exposed to
potentially explosive or flammable atmosphere. If this
instruction is not followed, a fire or explosion may result,
causing property damage, injury, or loss of life.
WARNING
The equipment and its ducting (supply and return air
ducts) are intended for use in one room only. Do not
install ductwork from a single unit to multiple rooms.
WARNING
The ducting for the 7K (40VML007--3) and 9K
(40VML009--3) (supply and return air ducts) is
intended for use in one room only. Do not install
ductwork from a single unit to multiple rooms for these
two models.
IMPORTANT: 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 or any associated
wiring or piping work.
MINIMUM DRAIN
TILT 1/100 a40-1849
Fig. 9 — Threaded Rod
INDOOR UNIT
LEVELING
NUT
” THREADED
ROD
MOUNTING
BRACKET
SUPPLY AIR
OPENING
FRONT VIEW
When the unit is
level, tighten
nut to secure
the position of
the mounting
bracket on the
threaded rod.
Side rail
Dentilation panel
RETURN AIR
RETURN AIR
FILTER FRAME
COVER PLATE
9
Apply Foam Insulating Tape
1. Apply foam insulating tape to the return air opening on
the bottom of the unit. See Fig. 11 below.
Fig. 11 —Applying Foam Insulation Tape
2. Use the existing screws to re-install the return air cover
plate on the rear of the unit.
Re-install Air Filter and Frame — Re-install the return air
filter and the filter frame on the bottom of the unit. Refer to the
arrows in Fig. 12.
Fig. 12 —Re-installing Return Air Filter and Frame
Secure the Frame and Filter — Use the provided clips to
secure the filter inside the filter frame. See Fig. 13.
Fig. 13 —Securing the Filter and Frame
Step 4 — Connect Piping
CONDENSATE PIPING — The unit is supplied with a 1
inch OD drain connection to connect copper or PVC drain
piping. See Fig. 14. Maximum pump lift is 27-1/2 inches.
Fig. 14 —Condensate Drain Connection
Follow these recommendations when installing condensate
piping:
• The highest point in the condensate piping should be as
close to the unit as possible. See Fig. 15.
• Condensate piping should slope downward in the
direction of condensate flow with a minimum gradient of
1 inch per 100 inches. See Fig. 15.
Fig. 15 —Condensate Piping
• When multiple units are connected to a common
condensate drain, ensure that the drain is large enough to
accommodate the volume of condensate from all units. It
is also recommended to have an air vent in the
condensate piping to prevent air lock.
• Condensate piping must not be installed where it may be
exposed to freezing temperatures.
NOTE: CN18 can be disconnected to stop the pump. The
condensate switch is CN5, which can be used for gravity drain
protection. See Fig. 16.
Fig. 16 —Using a Main Drain to Serve Multiple Indoor Units with Internal Condensate Pumps
FOAM
INSULATING
TAPE
RETURN AIR
FILTER
DETAIL
CLIP
FILTER
INSULATION
INDOOR
UNIT
CONDENSATE HOSE CLAMP
LINE STUB
FLEXIBLE DRAIN
CONNECTOR PVC DRAIN
PIPE
SUSPENSION RODS
STRUCTURAL CEILING
8 in.
Max 27-1/2 in.
3 ft.
SUPPORT
STRAPS
DRAIN LINE
10
REFRIGERANT PIPING
When connecting refrigerant piping from an indoor unit to an
outdoor unit, follow these guidelines:
• Check maximum height drop and length of refrigerant
piping between the indoor and outdoor units. To ensure
the drop and length are acceptable, refer to the
refrigerant piping allowable limits in the outdoor unit
installation manual.
• The number of bends in the refrigeration piping must be
less than 15.
• Refrigerant piping connection between indoor and
outdoor units should be performed once the units are
secured at their respective installation locations.
• The refrigeration piping starts at the indoor unit and ends
at the outdoor unit or MDC (Multiport Distribution
Controller) for Heat Recovery systems.
• The refrigerant piping should be dry and free of dust and
other impurities.
• The bending angle of the refrigerant pipe should not
exceed 90° and the bending radius should be as large as
possible to prevent any breakage in piping.
• Use proper cutting and flaring tools to avoid leakage.
• Use a torque wrench for flare nuts. Refer to Table 3 for
flare nut torque recommendations.
Table 3 — Flare Nut Torque Recommendations
• Before insulating the suction and liquid refrigeration
pipes, perform pressure and leak tests. For details, see
the outdoor unit installation manual. Insulating both
suction and liquid refrigerant pipes is mandatory.
• Vacuuming and charging of the system should be carried
out as described in the outdoor unit installation manual.
Step 5 — Complete Electrical Connections —
Installation of wiring must conform with local building codes
and with National Electric Code ANSI/NFPA 70 (current
editions). Units must be electrically grounded in conformance
with the code. In Canada, wiring must comply with CSA
C22.1, Electrical Code.
This equipment in its standard form is designed for an
electrical supply of 208/230-1-60. Any damage to or failure of
units caused by incorrect wiring or voltage is not covered by
the warranty.
Electric wiring must be sized to carry the full load amp draw of
the motor, starter, and any other controls that are used with the
unit. See Table 4 for electrical data.
Table 4 — 40VML Electrical Data
After the pipe work is complete, the electrical supply can be
connected by routing the cable through the appropriate casing
holes or knockouts and connecting the supply and ground
cables to the unit’s power terminal.
Be sure the power wiring and control wiring do not cross. This
might cause disturbance on the controls side. See Fig. 17 for
wiring diagrams.
NOTE: The indoor unit requires its own power supply. Indoor
units are not powered through outdoor units.
CAUTION
When connecting from an indoor unit to an outdoor unit,
the isolation valve at the outdoor unit should be in the
closed position throughout the refrigerant piping process.
Failure to follow this procedure may result in equipment
damage.
OUTSIDE DIAMETER (IN.) RECOMMENDED TORQUE
(FT-LB)
1/415
3/826
1/241
5/848
WARNING
Electrical shock can cause personal injury and death.
Disconnect the power supply before making wiring
connections. There may be more than one disconnect
switch. Tag all disconnect locations to alert others not to
restore power until work is completed.
WARNING
All units must be wired strictly in accordance with the
wiring diagram supplied with the unit. Any wiring different
from the wiring diagram could result in personal injury and
property damage.
CAUTION
Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
Ensure supply voltage to the unit, as indicated on the serial
plate, is not more than 10% over or under the rated voltage.
Failure to follow these recommendations may result in
equipment damage.
40VML UNIT SIZE POWER SUPPLY
MCA MOPD
007 0.50 15
009 0.50 15
012 0.60 15
015 0.80 15
018 0.95 15
024 1.18 15
LEGEND
MCA —Minimum Circuit Amps
MOPD —Maximum Overcurrent
Protective Device
11
WIRING DIAGRAM
NOTE: Field wiring must use copper conductors only.
Fig. 17 —40VML007-024 Typical Wiring Diagram
LEGEND
ACB —Auxiliary Control Board
ALARM —Warning Lamp
AUXH —Output for Auxiliary Heat
CS —Condensate Switch
CTON —Output for Cooling Operation
EEV —Electronic Expansion Valve
FAN —Output for Fan Operation
FM —Indoor Fan Motor
HTON —Output for Heating Operation
PUMP —Pump Motor
T1 —Room Temperature Sensor
T2A —Inlet Pipe Temperature Sensor
T2B —Outlet Pipe Temperature Sensor
XP1-4 —Connectors
XS1-4
XT1-2 —Terminal Block
---------- — Optional Component or Field Wiring
EEV
FM
ALARM
PUMP
CN24
N3 CN1C8
CN2
EARTH
Y/G
CN15CN9CN17
Y/G
L1 L2
controller
To wired
comm. bus
To outdoor/indoor/MDC
units comm. bus
CN51
CN50
ACB interface
( Current range: 0-1A)
(Voltage range: 0-24V AC/DC)
FAN
CTON
HTON
AUXH
XP4
XS4
Display Board
RED BLUE
YELLOW
GRAY
WHITE
BLUE
ON/OFF
SWITCH
Main Board
CS
POWER IN
XT1
XT2
CN14 CN21 CN12
CN4
CN5
CN54 CN52 CN8
P
Q
P
Q
SW1 SW8
ON ON
ENC2
ENC1
Occupancy
sensor/ON-OFF
(Dry contact)
“ +5V GND +12V ”
ONLY USED
FOR TESTING
T2A
T2B
T1
XS3
XP3
XS1
XP1
XS2
XP2
RED
WHITE
BLUE
HA HB
XP7/XS7
No Beep Harness
12
Step 6 — Position and Connect Controller —
Wired controllers should be installed in a position that
maintains good temperature control:
• Position the thermostat approximately 48 inches above
floor level.
• Do not position the thermostat where it can be directly
affected by the unit’s discharge airstream.
• Avoid external walls and drafts from windows and doors.
• Avoid positioning near shelves and curtains as these
restrict air movement.
• Avoid heat sources such as direct sunlight, heaters,
dimmer switches, and other electrical devices.
• See Fig. 18 for an example of communication wire
connection.
CONTROL WIRING
1. The communication wire should be 2-core stranded
shielded cable.
2. For indoor unit and outdoor unit communication, use P,
Q terminals. Shielded core should be used for ground.
3. Wiring should be run according to the wiring diagram.
4. Communication wire must not form a closed loop.
Fig. 18 —Communication Wire Connection
OPTION/EXTENSIONS OF COMMUNICATION
WIRING — To extend control wiring or to make terminal
connections, use the PQE connection wire supplied in the
accessory kit and follow the steps below.
1. Cut the connector on the outdoor unit side as shown in
Fig. 19 below.
Fig. 19 —Shearing Outdoor Connector
2. Strip a suitable length of the insulation layer as shown in
Fig. 20 below.
Fig. 20 —Stripping The Wire
3. Use a suitable screwdriver to fix the communication wire
on the outdoor unit communication terminal as shown in
Fig. 21 below.
If communication wires are used to connect indoor units, find
the corresponding port and plug it in as shown in Fig. 22.
Fig. 22 —Connecting the Communication Wires
If it is not possible to buy communication wires from Carrier,
connect the indoor unit side of communication wires using the
connector provided with the accessories as shown in Fig. 23.
See Fig. 24 and 25 for typical communication wiring of the
heat pump and the heat recovery systems.
LEGEND
ACB —Auxiliary Control Board
To outdoor/indoor/MDC units
comm. bus
To wired controller comm. bus
XT2
CAUTION
Failure to follow these procedures may result in personal
injury or damage to equipment.
NEVER CONNECT the main power source to the control
or communication terminal block.
USE AN APPROPRIATE SCREWDRIVER for
tightening the terminal screws. Do not over tighten the
terminal screws.
IMPORTANT: Wiring for communication shall be two
inches or more apart from power source wiring to avoid
electric noise. Do not insert control/communication and
power source wire in the same conduit.
Pay attention to polarity of the communication wire.
Fig. 21 — Connecting Communication Wire to
Outdoor Unit Communication Terminal
13
Fig. 23 —Connecting the Communication Cable to Indoor Unit Using the Supplied Connector
Fig. 24 —Typical Heat Recovery System Communication Wiring
Connector in accessory kitConnector on indoor unit Communication cable
in field
P Q X Y
X Y
MDC unit
outdoor unit Centralized controller
HA HB
P Q
P Q
P Q
P Q
P Q
P Q
wired controller
HA HB
To No.1
indoor
To No.2
indoor
To No.3
indoor
To No.4
indoor
To No.1
indoor
To No.2
indoor
To Sub MDC
Main MDC unit
To outdoor
To outdoor
L1
L2
L3
L3
L3
L3
L4
L4
L5
L6
L7
L8
L9
L10
L11
Indoor unit 1#
HA HB
Indoor unit 2#
Indoor unit 3#
Indoor unit 4#
Indoor unit 5#
Indoor unit 6#
HA HB
HA HB
HA HB
HA HB
HA HB
Maximum wiring length
//IW$:*&RUH6WUDQGHG6KLHOG
/IW$:*&RUH6WUDQGHG6KLHOG
/IW$:*&RUH6WUDQGHG6KLHOG
/IW$:*&RUH6WUDQGHG6KLHOG
HA HB
HA HB
HA HB
HA HB
HA HB
HA HB
NOTE: Power from IDU
NOTE: 24 v. DC Power
(Field Supplied)
Touch screen
wired controller
//IW$:*&RUH6WUDQGHG6KLHOG
////IW$:*&RUH6WUDQGHG6KLHOG
14
Fig. 25 — Typical Heat Pump System Communication Wiring
NOTE: Network resistor is shipped with the outdoor unit for field installation on heat pump systems.
P Q X Y
X Y
outdoor unit Centralized controller
HA HB
P Q
P Q
P Q
P Q
P Q
wired controller
HA HB
L1
L3
L5
L6
L7
L8
L9
L10
L11
L3
L3
L3
L3
Indoor unit 1#
Indoor unit 2#
Indoor unit 4#
Indoor unit 5#
Indoor unit 6#
Indoor unit 3#
P Q
HA HB
HA HB
HA HB
HA HB
HA HB
HA HB
P
Q
Network Resistor
wired controller
Touch screen
HA HB
HA HB
HA HB
HA HB
HA HB
HA HB
NOTE: Power from IDU
NOTE: 24 v. DC Power
(Field Supplied)
Maximum wiring length
//IW$:*&RUH6WUDQGHG6KLHOG
/IW$:*&RUH6WUDQGHG6KLHOG
////IW$:*&RUH6WUDQGHG6KLHOG
//IW$:*&RUH6WUDQGHG6KLHOG
15
ACB Interface
The ACB interface is a dry contact board that can output up to
four signal controlling devices. Refer to Fig. 17 and 26 for
connecting the ACB interface board and devices.
Fig. 26 —ACB Interface
START-UP
Pre-Start Check — Once installation is complete, make
the following pre-start checks:
1. All indoor and outdoor units are properly installed.
2. All piping and insulation is complete.
3. All electrical connections (both power and control) are
properly terminated.
4. All condensate drains are installed correctly.
5. The power supply is the right voltage and frequency.
6. The units are properly grounded in accordance with
current electrical codes.
7. Suction and liquid line service valves are in the open
position.
Drain Pump and Drainage Test — Follow these
steps to perform the test:
1. Remove the test cover by rotating it counter-clockwise as
shown in Fig. 27.
Fig. 27 —Test Cover
2. Use a piece of tubing or pipe to fill the drain pump
reservoir with 70 oz. of water as shown in Fig. 28 below.
Fig. 28 —Tube/Pipe Insert
3. Turn the unit ON in cooling mode. The pump comes on.
Watch the end of the drain pipe for any water. It may take
time for the water to travel depending on the length of the
drain pipe.
4. During this test, check any bends or joints for leakage.
System Operation Check — Once the installation
and pre-start checks are complete, perform the following steps:
1. Using the remote controller, select cooling or heating
mode to check the operation of the system.
2. While the system is in operation, check the following on
the indoor unit:
a. Switches or buttons on the remote controller are
easy to push.
b. Indicator light is showing normal operation and no
error is indicated.
c. Swing mode of air louvers is working (if
applicable to unit).
d. Drain pump operation is normal (if applicable).
e. No abnormal vibration or noise.
IMPORTANT: The system can connect 64 indoor units
with different system addresses. If two indoor units in the
same system have identical addresses, abnormal operation
will occur.
LEGEND
ACB —Auxiliary Control Board
FAN —Output for Fan Operation
CTON —Output for Cooling Operation
HTON —Output for Heating Operation
MAX AMPS 1A
MAX VOLTAGE 24V
CN50
CN51
ACB interface
FAN
CTON
HTON
AUXH
C
L
O
S
E
D
O
P
E
N
E
D
O
O
C
S
L
P
E
N
Test Cover
Tube/Pipe
16
3. While the system is in operation, check the following on
the outdoor unit:
a. No abnormal vibration or noise is noticed.
b. Condenser fan is in operation.
c. Indicator light is showing normal operation and no
error is indicated.
NOTE: If the unit is turned off or restarted, there is a time
delay of three minutes for the compressor to start from the time
the power is restored.
MAINTENANCE
EVERY 3 MONTHS:
• Check the air filter condition. Clean or replace if
necessary.
EVERY 6 MONTHS:
Follow the 3-month maintenance schedule. In addition:
• Clean condensate tray with suitable cleaning agent.
• Clean the grille and panel if applicable.
EVERY 12 MONTHS:
Follow the 6-month maintenance schedule. In addition:
• Be sure all electrical connections are secure.
• Check condensate pump operation if applicable.
• Check the heating and cooling action to confirm proper
operation.
INDOOR UNIT ADDRESSING
For proper system operation, each indoor unit must have a
unique address set from 0 to 63. When setting an address by
remote controller, the outdoor units, indoor units, and MDC
must be powered on. If FE is displayed on the LED screen or
display board, this unit has no address. After setting all indoor
unit addresses, turn off the power supply to all indoor units to
clear the errors.
Indoor unit addressing can be distributed automatically in the
heat pump system. When dip switch “S6” on the outdoor unit’s
main PCB board is set to 00 (default set in factory), indoor
units are set for auto-addressing. When powering on for the
first time, it takes six minutes or more to finish auto-addressing
each indoor unit. The heat recovery system cannot accomplish
this function at this time.
Wireless Remote Controller (40VM900001) —
Indoor unit addressing can be performed using the wireless
remote controller. When using the wireless controller, the user
must maintain a line of sight with the receiver on the indoor
unit. See Fig. 29 for a description of the buttons on the wireless
remote.
Fig. 29 —Wireless Remote Controller
(40VM900001)
1. Use a tool to press and hold the LOCK button for at least
ten seconds.
2. Press to activate.
3. Click or to select an address and press to send
the setting.
To display an indoor unit address, use a tool to press and hold
the LOCK button for at least ten seconds, and press to
query the addresses.
Non-Programmable Controller
When setting an address, connect only one wired controller to
an indoor unit.
Press ROOM TEMP and SWING simultaneously for three
seconds. If there is no address for this indoor unit, the display
shows FE# 00. See Fig. 30. Otherwise, the display shows the
current address of the indoor unit.
Fig. 30 —Non-Programmable Controller IDU
Addressing Menu
CAUTION
When servicing or repairing this unit, use only factory-
approved service replacement parts. Refer to the rating
plate on the unit for complete unit model number, serial
number, and company address. Any substitution of parts or
controls not approved by the factory will be at the owner’s
risk and may result in equipment damage.
CAUTION
To avoid equipment damage, do not attempt to reuse any
mechanical or electrical controllers that have been wet.
Replace defective controller.
RESET
TIMER ON
TIMER OFF
SWING
AIR DIRECTION
CLOCK
OK
SWING
MODE FAN
AUTO
COOL
DRY
HEAT
FAN
TEMP
SET
CLOCK
SET
HOUR
FAN SPEED
LOCK
C/H
6 – AIR DIRECTION
2 – FAN SPEED SETTING
4 – ADJUST UP
9 – CLOCK SETTING
10 – TIMER ON
14 – OK (CONFIRM)
11 – TIMER OFF
1 – MODE SETTING
5 – ON/OFF
3 – ADJUST DOWN
7 – AIR VERT. SWING
8 – AIR HORIZ. SWING
12 – RESET
13 – LOCK
15 – COOL/HEAT A40-1734
MODE
FAN TEMP. DOWN
OK
TEMP. UP ON/OFF
TIMER
ROOM TEMP. SWING
#
17
Click TEMP. UP or TEMP. DOWN to change 00 to the
desired address as shown in Fig. 31. Press OK to confirm and
exit the setting interface.
Fig. 31 —Non-Programmable Controller Setting
IDU Address
Programmable Controller — When setting an
address, connect only one wired controller to an indoor unit.
1. Press FAN and BACK simultaneously for five seconds to
access parameter settings as shown in Fig. 32.
2. Press TEMP. UP or TEMP. DOWN to move the cursor
and choose IDU ADDRESSING. Press MENU/OK to
access this setting.
3. Press TEMP. UP or TEMP. DOWN to choose the
address you want to set as shown in Fig. 33. Press
MENU/OK to send this address to the IDU.
Fig. 33 —Programmable Controller Setting IDU
Address
4. Press BACK twice or wait 30 seconds to automatically
exit the parameter settings menu.
#
MODE
FAN TEMP. DOWN
OK
TEMP. UP ON/OFF
TIMER
ROOM TEMP. SWING
Fig. 32 — Programmable Controller IDU
Addressing Menu
MODE
FAN
MENU
TEMP. DOWN
TEMP. UP
OK
BACK
ON/OFF
MODE
FAN
MENU
TEMP. DOWN
OK
TEMP. UP
BACK
ON/OFF
18
TROUBLESHOOTING
Figure 34 shows the LED display panel on the indoor unit. See Table 5 for a summary of display indicators. Table 6 lists problems,
possible causes, and possible solutions.
Table 5 — LED Display Indicators
ERROR CODE LED DISPLAY MODE/STATUS
[NO ERROR]
Operation Light ON Starting
None Shutdown
Operation Light Flashing Standby
Timer Light ON Timing ON
Timer Light OFF Timing OFF
Operation and Defrost / Fan Light ON System Defrost ON
Operation and Defrost / Fan Light OFF System Defrost OFF
Operation Light ON Only fan
dd None Heating / Cooling Mode Conflict
E1 None Communication Error Between Indoor and Outdoor Unit
E2 None Check Indoor Ambient Temperature Sensor (T1)
E4 None Check Evaporator Temperature Sensor (T2B)
E5 None Check Evaporator Outlet Temperature Sensor (T2A)
E6 None Check DC Fan Motor
E7 None EEPROM Error (Data Storage)
E9 None Communication Error Between Indoor Unit and Controller
Eb None EEV Error
Ed None Outdoor Unit Error
EE None Condensate Error
FE None No Address When Power ON For First Time
UU None MDC Error In Auto System-Check Mode
LEGEND
EEPROM —Electronically Erasable Programmable Read-only Memory
EEV —Electronic Expansion Valve
MDC —Multiport Distribution Controller
Fig. 34 — LED Display Panel
a40-1873
MANUAL OPERATION TIMER DEF./FAN ALARM
19
Table 6 — Troubleshooting
Replacement Parts
Quote the unit model number and unit serial number when
ordering replacement parts or contacting the factory about the
unit. This information can be found on the serial plate attached
to the unit. See Fig. 35.
Fig. 35 —Unit Serial Plate (Example)
ERROR DESCRIPTION POSSIBLE CAUSES POSSIBLE SOLUTIONS
DD Heating / Cooling Mode Conflict
System is in cooling or fan only mode and
heating signal is received from a unit on the
system.
All units should be in cooling mode for system to
stay in cooling mode.
System is in heating mode and cooling
signal is received from a unit in the system.
All units should be in heating mode.
E1 Communication Error Between
Indoor & Outdoor Unit
Signal wires are short-circuited or
disconnected.
Check or reconnect signal wire.
Signal wire close to electromagnetic
source.
Distance signal wires from electromagnetic
source.
PC board fault. Replace PC board.
E2, E4,
E5 Check Temperature Sensor
Loose connection at port on PC board. Tighten the connection at port on PC board.
Sensor is short-circuited. Using multi-meter, measure resistance of the
sensor. If the resistance is < 100 ohms, change
the sensor.
PC board fault. Replace PC board.
E6 DC Fan Motor
Operating beyond limits. Check and correct external static pressure on the
unit.
DC motor fault. Replace DC motor.
PC board fault. Replace PC board.
E7 EEPROM Error (Data Storage) Chip or PC board fault. Replace PC board.
E9 Communication Error Between
Indoor Unit and Controller
Signal wires are short-circuited or
disconnected.
Check or reconnect signal wires.
Signal wires close to electromagnetic
source.
Distance signal wires from electromagnetic
source.
PC board fault. Replace PC board.
EB EEV Error
EEV wires are short-circuited or
disconnected.
Replace EEV wires.
EEV stop. Replace EEV.
PC board fault. Replace PC board.
ED Outdoor Unit Error Outdoor unit fault. Refer to outdoor unit troubleshooting guide.
EE Condensate Error
Loose connection or disconnected. Tighten the connection or reconnect at port on
PC board.
Water level float is stuck. Inspect the slope.
Trap slope is too steep. Adjust the trap slope.
Drain pipe is too long. Adjust the length of drain pipe.
Drain pump faulty. Replace the drain pump.
FE No Address When Power ON for first
time Indoor unit without address.
Run automatic addressing option at the outdoor
unit.
Use remote wireless or wired controller to
readdress indoor unit.
UU MDC Auto System-Check Mode MDC fault Refer to MDC troubleshooting guide.
LEGEND
EEV —Electronic Expansion Valve
EEPROM —Electronically Erasable Programmable Read-only Memory
MDC —Multiport Distribution Controller
PC —Process Controller
LOW STATIC PRESSURE DUCT TYPE
AIR CONDITIONER INDOOR UNIT
MODEL
R410A
HIGH
LOW
REFRIGERANT
0.50 A
15 A
0.40 A
100 W (1/8HP)
40VML007---3
208/230V-1Ph-60Hz
320 PSIG
580 PSIG
DESIGN
PRESSURE
POWER SUPPLY
MINIMUM CIRCUIT AMPACITY
MAX FUSE OR HACR BREAKER
FAN MOTOR FLA
OUTPUT
SERIAL NO.
CONFORMS TO UL STD 1995
CERTIFIED TO CSA STD.
C22. 2 No. 236
ELECTRIC CHARACTERISTICS
ARE ONLY FOR INDOOR UNIT.
1016V00001
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 20-40VML001-02 Printed in U.S.A. Form 40VML-3SI Pg 20 08-20 Replaces: 40VML-2SI
© Carrier Corporation 2020
APPENDIX A — DIP SWITCH SETTINGS
There are two DIP switches on the main board. Figures A and B show the settings for each parameter controlled by a switch. Switches
are shown in the default settings.
v
POSITION 1 — START-UP
OFF — Auto Addressing Mode (Default)
ON — Factory Test Mode
POSITION 2 — MODE
OFF — Normal Mode (default)
ON — Factory Self-Checking Mode
POSITION 3 — NOT USED
POSITION 4 — INDOOR UNIT IDENTIFICATION
OFF — Standard Indoor Unit (Default)
ON — Mode Priority Indoor Unit (HP only)
(IDU address must be 63)
Fig. A — SW1 Settings
ON
OFF
1234
a40-1923
ON
OFF
1234
a40-1923
ON
OFF
ON
OFF
1234
a40-1923
OFF — Thermal Off Fan Off (Default)
ON — Thermal Off Fan On
(The wired controller must be connected to the
indoor unit, and use the room temperature sensor
on the wired controller to turn on this function)
Fig. B —SW8 Settings
Table of contents
