AHRI CERTIFICATE M4THM1918A12NA Split System 19 Series Multi Zone Inverter System Installation Guide
- June 15, 2024
- AHRI CERTIFICATE
Table of Contents
M4THM1918A12NA Split System 19 Series Multi Zone Inverter System
Product Information
Product Name: Split System (R-410A) 19 Series Multi-Zone
Inverter System
Capacity: 18,000 Btu/h to 42,000 Btu/h
Release Date: January 2023
Models:
- M4THM1918A12NA
- M4THM1924A13NA
- M4THM1930A14NA
- M4THM1936A14NA
- M4THM1942A15NA
Product Usage Instructions
Safety Precautions
It is crucial to strictly adhere to the following safety
precautions to ensure personal safety and proper operation of the
equipment:
-
Read and follow all warnings and cautions provided in this user
manual. -
Only trained professionals should service the equipment.
Unqualified individuals must not attempt to service or alter the
equipment as it contains refrigerant under pressure and operates at
high voltage. Improper installation or adjustment can lead to
safety hazards such as fire, electrocution, or explosion. -
Use only the factory recommended oil type for the
equipment. -
Adhere to responsible refrigerant practices and environmental
concerns.
Pre-Installation Checklist
Prior to installation, ensure the following checklist is
completed:
-
Safety precautions have been reviewed and understood.
-
Ductless Multi-Split approved combinations have been
identified. -
Operating temperature ranges have been considered.
Product Introduction
Introduction to the product and its features.
Installing the Outdoor Unit
Follow these steps to install the outdoor unit:
-
Select the appropriate installation location.
-
Properly install the outdoor unit according to the provided
guidelines. -
Follow condensate management procedures for the outdoor
unit.
Maintenance
Maintenance procedures for the equipment.
List of Resistance for Temperature Sensor
A list of resistance values for temperature sensors.
Parts Replacement
Instructions for replacing parts of the equipment.
After-Sales Service
Information regarding after-sales service for the product.
Installer’s Guide
Split System (R-410A)
19 Series Multi-Zone Inverter System
18,000 Btu/h to 42,000 Btu/h
January 2023
Models :
M4THM1918A12NA M4THM1924A13NA M4THM1930A14NA M4THM1936A14NA M4THM1942A15NA
88-M4THM19-1A-EN
Warnings and Cautions
Warnings are provided to alert others of the potential hazards that could
result in severe personal injury or death, while cautions are designed to
alert others of the conditions that could result in minor or moderate injury.
Your personal safety and the proper operation of this machine depend upon the
strict observance of these precautions.
Attention: Warnings and Cautions appear at appropriate sections throughout
this literature. Read these carefully.
WARNING: Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury. It may also be used to alert against
unsafe practices. NOTICE: Indicates a situation that could result in equipment
or property damage.
WARNING This equipment is to be serviced by professionally trained personnel
ONLY. Under NO circumstances should an unqualified person service it. This
equipment contains refrigerant under PRESSURE and operates at HIGH VOLTAGE.
Improperly installed, adjusted or altered equipment by an unqualified person
poses safety hazards including FIRE, ELECTROCUTION, or EXPLOSION, which could
result in death or serious injury.
WARNING Electrocution and Fire Hazards with Improperly Installed and Grounded
Field Wiring! Improperly installed and grounded field wiring poses FIRE and
ELECTROCUTION hazards. To avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as described in the National
Electrical Codes (NEC) and your State and/or local electrical codes. All field
wiring MUST be performed by qualified personnel. Failure to follow these
requirements could result in death or serious injury.
Warnings and Cautions
WARNING
R-410A Refrigerant under Higher Pressure than R-22! The units described in
this manual use R-410A refrigerant which operates at 50 to 70% higher
pressures than R-22. Use only R-410A approved service equipment. Refrigerant
cylinders may contain a “dip” tube to allow for charging of liquid refrigerant
into the system. For specific handling concerns with R-410A, please contact
your local sales office. Failure to use R-410A approved service equipment
could result in standard equipment exploding under R-410A higher pressure
which could result in death or serious injury.
NOTICE Use appropriate oil with R410A systems. Oil type is found at the bottom
of Connection Pipe Requirements table (included in the outdoor unit
installation manual). R-410A systems utilize POE (Polyolester) or
PVE(Polyvinyl Ether) oil. Both oil types absorb moisture readily, yet,
lubrication properties vary. Do not leave the sealed system open to atmosphere
except during service for a short period of time. If the sealed system is left
open longer than four hours, the compressor oil must be changed. These systems
utilize strainers placed before and after the expansion device in the outdoor
unit, if debris or moisture is suspected, these strainers must be changed. Do
not break a vacuum with air. Do not leak check the sealed system with
compressed air. Unless instructed by factory service representative, external
refrigeration driers are prohibited.
USE ONLY THE FACTORY RECOMMENDED OIL TYPE!
Important!
Environmental Concerns
Scientific research has shown that certain man-made chemicals can affect the
earth’s naturally occurring stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified chemicals that may affect
the ozone layer are refrigerants that contain chlorofluorocarbons (CFC’s) and
those containing hydrochlorofluorocarbons (HCFC’s). Not all refrigerants
containing these compounds have the same potential impact to the environment.
The Company advocates the responsible handling of all refrigerants, including
industry replacements for CFC’s such as HCFC’s and HFC’s.
Responsible Refrigerant Practices
The manufacturer believes that responsible refrigerant practices are important
to the environment, our customers, and the air conditioning industry. All
technicians who handle refrigerants must be certified. The Federal Clean Air
Act (Section 608) sets forth the requirements for handling, reclaiming,
recovering and recycling of certain refrigerants and the equipment that is
used in these service procedures. In addition, some states or municipalities
may have additional requirements that must also be adhered to for responsible
management of refrigerants. Know the applicable laws and follow them.
Contents
Safety Precautions …………………………………………………………………………………..5 Pre-Installation
Checklist ………………………………………………………………………….6
Product Introduction …………………………………………………………………………………7 Ductless Multi-Split
Approved Combinations………………………………………………..8 Operating Temperature Ranges
…………………………………………………………………9
Preparation for Installation……………………………………………………………………….10 Selecting the
Installation Location …………………………………………………………….10 Installing the Outdoor Unit
………………………………………………………………………. 11 Condensate Management of the Outdoor
Unit…………………………………………… 11
Refrigerant Piping Between the Indoor and Outdoor Units ………………………….. 11
Refrigeration and Condensate Piping Tips …………………………………………………13 Connection Pipe
Requirements………………………………………………………………..14 Refrigerant Piping
Precautions…………………………………………………………………14 Nitrogen Purging While Brazing
……………………………………………………………….14 Installing the Refrigerant
Piping………………………………………………………………..16 Insulating the Refrigeration Piping and
Connections …………………………………..16 Refrigerant Piping Between the Indoor and
Outdoor Units …………………………..17 Vacuum and Refrigerant Leakage
Detection………………………………………………19
Wiring Precautions …………………………………………………………………………………20 Outdoor Wiring
Connections ……………………………………………………………………20 Stranded Wiring
Connections…………………………………………………………………..21 Electrical Connections
…………………………………………………………………………….22 Post Installation Checklist
……………………………………………………………………….22
Refrigerant System Diagrams ………………………………………………………………….24 Electrical
Connections at the Outdoor Unit…………………………………………………25 Wiring Diagrams
…………………………………………………………………………………….26 Dimensional Diagrams
……………………………………………………………………………29 Troubleshooting
…………………………………………………………………………………….. 31 Error Codes
…………………………………………………………………………………………..32
Maintenance ………………………………………………………………………………………….33 List of Resistance for
Temperature Sensor ………………………………………………..34 Parts Replacement
…………………………………………………………………………………37 After-Sales
Service…………………………………………………………………………………37
19 Series Multi-Split
Safety Precautions
Your personal safety and the proper operation of this equipment depend upon the strict observance of these precautions.
WARNING CAUTION NOTICE
This mark indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
This mark indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury. It may also be used to alert against
unsafe practices. This mark indicates a situation which could result in
equipment and/or property damage.
WARNING
1. Installation should performed by a qualified HVAC professional. Industry
Standard Personal Protective Equipment (PPE) and gear for height related
safety should be worn during installation. Improper personal safety
precautions and installation may cause death or serious injury.
2. Install the air conditioner according to the instructions given in this
manual. Incomplete installation work may cause water leakage, electrical shock
or fire.
3. Use the supplied or specified installation parts. Use of other parts may
cause the unit to come loose, resulting in water leakage, electrical shock or
fire.
4. Install the unit in a location that can support the weight of the unit. An
inadequate support structure or incomplete installation may cause injury or
property damage in the event the unit falls off of the installation location.
Refer to the installation specifications for additional requirements.
5. Electrical work should be carried out in accordance with the installation
manual and local, state and National Electric Code (NEC). Insufficient
capacity or incomplete electrical work may cause electrical shock or fire.
6. Use a dedicated power circuit. Never use a power supply shared by another
appliance.
7. For wiring, use a cable that is long enough to cover the entire distance
without splicing. Do not use an extension cord. Do not put other loads on the
power supply; use a dedicated power circuit. Failure to do so may cause
abnormal heat, electric shock or fire.
8. Use the specified types of wires for electrical connections between the
indoor and outdoor units. Firmly clamp the interconnecting wires so their
terminals receive no external stresses. Incomplete connections or clamping may
cause terminal overheating or fire.
9. After joining the interconnecting and supply wiring, shape the cables so
that they do not put undue force on the electrical covers or panels. Install
covers over the wires. Incomplete cover installation may cause terminal
overheating, electrical shock, or fire.
10. If any refrigerant leaks out during the installation, ventilate the room.
The refrigerant produces a toxic gas if exposed to flames.
11. When installing or relocating the system, keep the refrigerant circuit
free from substances other than the specified refrigerant (R-410A), such as
air. The presence of air or other foreign substances in the refrigerant
circuit can cause an abnormal pressure rise or rupture, which could result in
injury and damage.
5
88-M4THM19-1A-EN
19 Series Multi-Split
12. If a system pump-down is performed, turn off the associated equipment and
close service valves prior to removing the refrigerant piping. Failure to do
so will introduce non-condensables in the system, causing abnormal pressure in
the refrigeration cycle which could lead to injury and damage.
13. Before system start-up, attach the refrigerant piping securely. Failure
to do so will introduce noncondensables into the system when the compressor is
running, causing abnormal pressure in the refrigeration cycle which could lead
to injury and damage.
14. Establish a complete ground. Do not ground the unit to a utility pipe,
arrester, or telephone ground. An incomplete ground may cause electrical
shock, or fire. A high surge current from lightning or other sources may cause
damage to the air conditioner.
15. If the power supply cable is damaged, it must be replaced by the
manufacturer, its service agent or another qualified professional in order to
avoid electrical risk during and after replacement.
CAUTION
1. Do not install the unit in a place where there is danger of exposure to
flammable gas leakage. If gas leaks and builds up around the unit, it may
result in fire.
2. After system installation is completed, make sure no refrigerant leakage
is present.
3. This appliance is not intended for use by persons with a lack of
experience and knowledge, unless they have been given adequate supervision or
instruction concerning use of the appliance by a person responsible for their
safety.
4. Children should be supervised to ensure that they do not play with the
appliance.
NOTICE
1. Establish drain piping according to the instructions in this manual.
Inadequate piping may cause flooding.
2. Tighten the flare nut according to the specified method. If the flare nut
is tightened too hard, the flare nut may crack and cause refrigerant leakage.
Pre-Installation Checklist
1. Unpack and inspect each unit. 2. Check for any damage to the unit. 3.
Check the model numbers to ensure a proper match. 4. Check the unit nameplate
to ensure the proper electrical requirements will be met. 5. Check the
installation locations to ensure the weight of the units can be supported. 6.
Check the refrigerant pipe sizes and ensure they have been or will be
installed according to the
requirements in this manual. 7. Check the outdoor unit nameplate for
electrical power supply and wiring requirements to ensure the
proper wiring has been installed prior to connection. 8. Check the indoor unit
for coil leakage. The pressure relief valve on the gas pipe should release
pressurized nitrogen which ensures the unit has not leaked during shipping.
88-M4THM19-1A-EN
6
19 Series Multi-Split
Product Introduction
The 19 Series Multi-split system utilizes inverter compressor technology,
which enables the outdoor unit to send refrigerant to multiple indoor units of
varying capacities. It is critical, however, that heat loss and heat gain
calculations be performed to properly size the multi-split system.
Table 1: OD Unit Component Identification
No.
1
2
3
Name Motor Fan
Electric Box
4 Vapor Valve Assembly
5 Liquid Valve Assembly
Table 2: Number of Indoor Units
MODEL
Minimum number of connectable indoor units
Maximum number of connectable indoor units
M4THM1918A12 M4THM1924A13 M4THM1930A14 M4THM1936A14 M4THM1942A15
2
2
2
2
2
2
3
4
4
5
Note: When the total capacity of the indoor units exceeds the total capacity of the outdoor unit, the system will be restricted by the capacity of the outdoor unit. All indoor units would not be able to operate at full capacity at the same time. If the indoor unit combined capacity is less than 100% of the outdoor units’ capacity, the system capacity is limited to the indoor unit(s) combined capacity.
7
88-M4THM19-1A-EN
19 Series Multi-Split
Table 3: Ductless Multi-Split Approved Combinations
Outdoor Unit M4THM1918A12NA
18,000 BTUH Outdoor Unit M4THM1924A13NA
24,000 BTUH Outdoor Unit
M4THM1930A14NA 30,000 BTUH
Outdoor Unit
M4THM1936A14NA 36,000 BTUH
Outdoor Unit
M4THM1942A15NA 42,000 BTUH
Two Units
9 + 9
12+12
9 + 12
Two Units
9+9
9+12
9+18
12+12
12+18
18+18
One Indoor Two Indoor
9K+9K
9K+12K
9K+18K
9K+24K
12K+12K
12K+18K
12K+24K
18K+18K
18K+24K
One Indoor
Two Indoor 9K+9K 9K+12K 9K+18K 9K+24K 12K+12K 12K+18K 12K+24K 18K+18K 18K+24K 24K+24K
One Indoor
Two Indoor 9K+12K 9K+18K 9K+24K 12K+12K 12K+18K 12K+24K 18K+18K 18K+24K 24K+24K
Indoor Unit Combinations
9+9+9 9+9+12
Three Units 9+12+12 9+9+18
12+12+12
Three Indoor 9K+9K+9K 9K+9K+12K 9K+9K+18K 9K+9K+24K 9K+12K+12K 9K+12K+18K
9K+12K+24K 9K+18K+18K
12K+12K+12K 12K+12K+18K Three Indoor
9K+9K+9K 9K+9K+12K 9K+9K+18K 9K+9K+24K 9K+12K+12K 9K+12K+18K 9K+12K+24K
9K+18K+18K 9K+18K+24K 12K+12K+12K 12K+12K+18K 12K+12K+24K 12K+18K+18K
12K+18K+24K 18K+18K+18K Three Indoor 9K+9K+9K 9K+9K+12K 9K+9K+18K 9K+9K+24K
9K+12K+12K
9K+12K+18K 9K+12K+24K
9K+18K+18K
9K+18K+24K 9K+24K+24K
12K+12K+12K
12K+12K+18K 12K+12K+24K 12K+18K+18K 12K+18K+24K 12K+21K+24K 12K+24K+24K
18K+18K+18K 18K+18K+24K
Four Indoor 9K+9K+9K+9K 9K+9K+9K+12K 9K+9K+9K+18K 9K+9K+12K+12K 9K+12K+12K+12K
Four Indoor 9K+9K+9K+9K 9K+9K+9K+12K 9K+9K+9K+18K 9K+9K+9K+24K 9K+9K+12K+12K
9K+9K+12K+18K 9K+9K+12K+24K 9K+9K+18K+18K 9K+12K+12K+12K 9K+12K+12K+18K
12K+12K+12K+12K 12K+12K+12K+18K
Four Indoor 9K+9K+9K+9K 9K+9K+9K+12K 9K+9K+9K+18K 9K+9K+9K+24K 9K+9K+12K+12K
9K+9K+12K+18K 9K+9K+12K+24K 9K+9K+18K+18K 9K+9K+18K+24K 9K+12K+12K+12K
9K+12K+12K+18K 9K+12K+12K+24K 9K+12K+18K+18K 9K+12K+18K+24K 9K+18K+18K+18K
12K+12K+12K+12K 12K+12K+12K+18K 12K+12K+12K+24K 12K+12K+18K+18K
Five Indoor
Five Indoor
Five Indoor 9K+9K+9K+9K+9K 9K+9K+9K+9K+12K 9K+9K+9K+9K+18K 9K+9K+9K+9K+24K
9K+9K+9K+12K+12K 9K+9K+9K+12K+18K 9K+9K+9K+12K+24K 9K+9K+9K+18K+18K
9K+9K+12K+12K+12K 9K+9K+12K+12K+18K 9K+12K+12K+12K+12K 9K+12K+12K+12K+18K
12K+12K+12K+12K+12K
Note: Heating and cooling capacity capacity can be diminished with more that 100% indoor connected load.
88-M4THM19-1A-EN
8
19 Series Multi-Split
Table 4: Ductless Multi-Split Quick Reference
Multi-Split Heat Pump Outdoor
18,000 BTUH
24,000 BTUH
30,000 BTUH
36,000 BTUH
M4THM1918A12NA
M4THM1924A13NA
M4THM1930A14NA M4THM1936A14NA
42,000 BTUH M4THM1942A15NA
Combinations for Outdoor and Indoor Units
The figure below illustrates that multiple indoor high wall units may be used
on a single M4THM19 multi-port system, provided the combination is approved.
Please reference the multi-zone approved combinations matrix on page 8.
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Maximum number of 2 indoor units in any unit type combination for M4THM1918 Maximum number of 3 indoor units in any unit type combination for M4THM1924 Maximum number of 4 indoor units in any unit type combination for M4THM1930 Maximum number of 4 indoor units in any unit type combination for M4THM1936 Maximum number of 5 indoor units in any unit type combination for M4THM1942
When the total capacity of the indoor units exceeds the total capacity of the outdoor unit, the system will be restricted by the capacity of the outdoor unit. All indoor units would not be able to operate at full capacity at the same time. If the indoor unit combined capacity is less than 100% of the outdoor units’ capacity, the system capacity is limited to the indoor unit(s) combined capacity.
Table 5: Operating Temperature Ranges Cooling Operating Range Heating Operating Range
Outdoor Temperature -22 – 118 °F (-30 – 48 °C) Outdoor Temperature -22 – 75 °F (-30 – 24 °C)
Note: Please see the product data information for total cooling capacities down to 0 degrees F.
9
88-M4THM19-1A-EN
19 Series Multi-Split
Preparation for Installation
Selecting the Installation Location
Outdoor Unit
WARNING 1. Install the unit on a level surface or on supports that are level.
2. If the location is subject to strong winds, the additional force must be
accounted for
and the unit must be fixed securely to the base. Refer to local codes for
additional requirements.
1. Select a location where equipment noise and air discharge won’t be
distracting. 2. Select a location where there is sufficient ventilation. 3.
Make sure the air inlet and outlet are not blocked by any obstacles 4. Select
a location capable of supporting four times the weight of the unit, that will
not increase
vibration, and where installation work can be carried out safely. 5. Select a
location away from flammable gas or gas leaks. 6. Ensure installation of the
outdoor unit conforms to the clearance specifications in this manual. 7.
Locate the outdoor unit away from any bedroom windows.
NOTICE
Installing the unit in one of the following locations could result in unit
malfunction: 1. Places where oil (machine oil) is used. 2. Seaside places with
high levels of salt in the air. 3. Places with high levels of sulphur gas such
as areas with hot springs. 4. Places where high-frequency waves are generated
by radio equipment, welders and medical
equipment. 5. Other unusual places where unit operation may be altered. 6.
Places where minimum clearances cannot be met.
Space to the obstruction
20 in. or more
12 in. or more
Space to the wall in. or more
7 9 Air outlet side
88-M4THM19-1A-EN
Air inlet side 12 in. or more
Space to the wall 20 in. or more
valve cover
10
Installing the Outdoor Unit
19 Series Multi-Split
WARNING
1. Install the unit on a level surface or on supports that are level.
2. If the location is subject to strong winds, the additional force must be
accounted for and the unit must be fixed securely to the base. Refer to local
codes for additional requirements.
When the outdoor unit is surrounded by walls or other obstructions, the
installation space of the unit should be no less than the clearances indicated
below. For efficient operation, leave three of four directions of peripheral
constructions open when possible.
12(305) 20(508)
12(305)
20(508)
79(2000)
12 (305)
79(2000)
inch(mm)
Select the installation location that provides easy access to the indoor unit.
- Make sure the location can support at least four times the weight of the
unit. 2. Secure the outdoor unit on the selected base location with expansion
screws. 3. The outdoor unit should be installed at least 1 1/4 inch above the
ground or base in order to
install a drain pipe and connector (shown below).
At least 1 1/4 inch (31.8mm) clearance
Condensate Management of the Outdoor Unit
1. The outdoor unit(s) should be located where condensate poses no hazard or
safety risk. Each
unit is supplied with a drain pipe connector. 2. Before installing the drain
pipe fitting, appropriately plug all other base pan holes not used. 3. Install
the drain pipe fitting into the appropriate hole located at the base of the
unit and then
connect the drain pipe to it.
4. In heating mode – ice can be created in freezing conditions.
11
88-M4THM19-1A-EN
19 Series Multi-Split
5. Place the outdoor unit on the support base. 6. Secure the foot holes of
the outdoor unit with bolts (shown below).
Foot holes
Foot holes
88-M4THM19-1A-EN
12
Refrigeration and Condensate Piping Tips
19 Series Multi-Split
If the outdoor unit is installed lower than the indoor unit: 1. If indoor unit
condensate line follows refrigeration lines, then the drain pipe termination
should
be above ground in order that the end of the pipe should not dip into water.
2. Taping pipes must be done from bottom to top. Do not wrap too tightly to
avoid compression of
the insulation, otherwise its effectiveness is reduced. 3. All pipes are bound
together by pipe tape and secured to the wall with saddles. 4. NOTE: Oil traps
are sometimes needed when the outdoor unit is installed lower than the
indoor unit. One oil trap is required for each 33 ft. (10m) of vertical gas
pipe length.
Outdoor Unit Installed Lower than Indoor Unit
If the outdoor unit is installed higher than the indoor unit: 1. Taping should
be done from the lower to
the upper part. Do not wrap too tightly to avoid compression of the
insulation, otherwise its effectiveness is reduced. 2. All pipes are bound and
taped together and also should be trapped to prevent water from returning to
the room. 3. Secure all pipes to the wall with saddles. 4. NOTE: Oil traps are
sometimes needed when the outdoor unit is installed higher than the indoor
unit. An oil trap is needed for each 20 ft. (6m) of vertical rise on the gas
pipe.
Outdoor Unit Installed Higher than Indoor Unit
ODU
Drain Pipe
Oil Trap
Oil Trap
Liquid Pipe
Gas Pipe
Drain Pipe
Oil Trap
13
IDU
88-M4THM19-1A-EN
19 Series Multi-Split
Connection Pipe Requirements
NOTICE The maximum distance of the connection piping in both height and total
length is provided in the table below. Do not install these units in locations
that exceed these specifications.
Heat Pump M4THM1918 M4THM1924 M4THM1930 M4THM1936
M4THM1942
Table 6: Piping Information for M4THM19
Liquid Circuits inch
(mm)
Gas inch (mm)
Factory Charge oz (kg)
Additional oz/ft (g/m)
Max Length Circuit ft (m)
Min. Line Length ft (m)
Max Length System ft (m)
Max Height ODU to IDU ft (mm)
Max Height IDU to
IDU ft (mm)
Max Length without adding refrigerant ft (mm)
B
45.9
A
(1.3)
131.2 49.2 49.2
32.8
(40) (15) (15)
(10)
C
B
84.7 (2.4)
A
196.8 49.2 49.2 (60) (15) (15)
131.2 (40)
D
C
105.8
B
(3.0)
262.5 82
82
(80) (25) (25)
131.2 (40)
A
1/4 3/8
D
(6) (9.52)
0.2
82
15
(20)
(25) (4.57)
C
130.5
B
(3.7)
262.5 82
82
(80) (25) (25)
131.2 (40)
A
E
D
C
134 (3.8)
B
328.1 82
82
164
(100) (25) (25)
(50)
A
Refrigerant Piping Precautions
NOTICE
System Component Damage! Do not remove the seal caps from the refrigerant
connections and piping until prepared to braze refrigerant pipes to the
connections. Excessive exposure to atmosphere (greater than 5 minutes) may
allow moisture or other particulates to contaminate the system, damaging valve
seals and causing ice formation in the system components during operation.
Nitrogen Purging While Brazing
NOTICE Avoid Unit Damage! Never braze pipe connections without performing
nitrogen purging. Failure to perform this procedure will damage the unit,
resulting in capacity loss and reduced long-term reliability.
88-M4THM19-1A-EN
14
19 Series Multi-Split
While brazing refrigerant pipes, continuously purge them with nitrogen gas.
Use a pressure regulator to maintain a flow rate of 1.76 ft³/h (0.05 m³/h) or
more.
Nitrogen purging while brazing refrigerant pipes
Nitrogen Pressure regulator
Stop valve Flow meter
Nitrogen
Refrigerant Piping Between the Indoor and Outdoor Units All indoor units are individually connected to ports at the outdoor unit. (As shown below)
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
Wall Mounted Indoor Unit
· If any refrigerant ports are not connected to indoor units, please tighten
the cap to seal off the port. Paired ports are labeled A, B, C, D and E for up
to five indoor units.
· During the connection of the indoor unit and the refrigerant pipe, never
pull any joints of the indoor unit by force, otherwise the pipes may crack
which would then result in leakage.
· The refrigerant pipe should be supported by brackets, in order to not place
stress on the indoor and outdoor unit. If the piping connection size of the
outdoor unit does not match the piping connection size of the indoor unit, use
the piping connection dimension of the indoor unit. Use the appropriate
supplied connector tube to make the transition at the outdoor unit. DO NOT
INSTALL TRANSITION TUBES AT THE INDOOR UNIT.
· Each pipe should be labeled to tell which indoor system it belongs to avoid
mistaken or inaccurate piping connections.
15
88-M4THM19-1A-EN
19 Series Multi-Split
Installing the Refrigerant Piping
Flaring Process 1. Hold the pipe downward to prevent cuttings from entering
the pipe. 2. Using an appropriate tube cutter and deburring tool, cut and
deburr the refrigerant pipe. 3. Remove the flare nuts at the stop valve of the
outdoor unit and inside the accessory bag of
the indoor unit, put them onto the refrigerant pipe as shown below then flare
the refrigerant pipe with a flaring tool. 4. When flaring copper tubing, only
use flaring tools that utilize an orbiting mandrel and clutched handle. These
are typically referenced as R410A flaring tools. By using this type of flaring
tool, the copper tubing is rolled while being pressed, thereby reducing the
probability of copper flare cracking. 5. Check if the flare is even length,
smooth and the inside is shiny with no imperfections.
Bending Pipes
88-M4THM19-1A-EN
16
19 Series Multi-Split
1. Use a refrigerant pipe bending tool to shape refrigerant piping; smaller
diameter piping may allow for light hand bending, providing minimum diameter
of 6 inches.
2. Do not bend the pipes in an angle more than 90°. 3. When pipes are
repeatedly bent or stretched, the material will be prone to damage, which may
lead to refrigerant leaks. Do not bend or stretch the pipes more than three
times. 4. Do not bend the pipe while insulated. First, cut the insulation with
a sharp cutting tool and
expose it to the appropriate bend radius, as shown below. After bending the
pipe, replace the insulation and seal it with pipe wrap tape.
Refrigerant Piping at the Indoor Units Reference the Indoor Unit Installation Guide Refrigerant Piping at the Outdoor Unit Tighten the flare nut of the connection pipe at the outdoor unit valve connector. Follow the flare nut guidelines in this manual.
Pipe Diameter in. (mm) 1/4″ (6.35) 3/8″ (9.52) 1/2″ (12.7) 5/8″ (15.9)
Table 7: Torque Reference Table
Tube Thickness in. (mm)
Tightening Torque
0.03 (0.8)
11.25 – 14.75 lb·ft (15 ~ 20 N·m)
0.03 (0.8)
22.25 – 29.50 lb·ft (30 ~ 40 N·m)
0.03 (0.8)
33.25 – 40.50 lb·ft (45 ~ 55 N·m)
0.04 (1.0)
44.25 – 47.75 lb·ft (60 ~ 65 N·m)
17
88-M4THM19-1A-EN
19 Series Multi-Split
NOTICE 1. To prevent distortion and breaking of the pipe, bend the pipe with a
radius of curvature of 6
in. (150 mm) or more. Use a tubing bender when forming the copper tubing into
a bend. 2. If the pipe is bent repeatedly at the same place, it will break.
CAUTION Connect the gas pipe after connecting the liquid pipe completely.
Insulating the Refrigerant Piping and Connections 1. The refrigerant pipes
should be insulated and wrapped with appropriate insulating
material and wrapping tape. This will prevent condensation, water leakage and
damage to the insulating material. 2. The connections at the indoor unit
should be wrapped with insulating material. No gap is allowed on the joint of
the indoor unit, as shown below.
88-M4THM19-1A-EN
18
Vacuum and Refrigerant Leakage Detection
19 Series Multi-Split
NOTICE
Do not purge the air with refrigerant. Use a vacuum pump to vacuum the
installation!
1. When connecting refrigerant pipe to the unit or removing it from the unit,
please use both a back-up wrench and the torque wrench.
2. When connecting, place the equipment specified oil type on the backside of
the copper tube flare prior to tightening. Do not place oil on the flare face,
as this will promote system contamination, tighten it by hand and then tighten
it with the spanner or adjustable wrench.
3. Refer to the torque reference table within this document before tightening
to determine the appropriate torque (over-tightening will damage the nut and
lead to leakage).
4. Use dry Nitrogen to pressurize the piping circuit with 150 PSIG and allow
it to hold while performing other installation processes. It is recommended to
apply a soap bubble solution and observe the connection.
5. Evacuate each individual refrigeration circuit to 350 microns or below,
and close off the valve to the vacuum pump. If the pressure rises above 500
microns within one minute, but not above 1500 microns within 5 minutes,
moisture is present. If the pressure continues to rise above 1500 microns, a
leak exists in the circuit being tested. a) If moisture is present, use triple
evacuation process to eliminate the moisture. b) If a leak is present, leak
check all joints and piping. Evacuation is not completed until the micron
gauge does not rise above 500 microns within one minute after achieving 350
micron pressure vacuum.
6. After evacuation is complete, additional charge is to be added. a) If no
additional charge is required, break the vacuum with refrigerant, then remove
the gauge connectors. b) slightly open the liquid valve at the outdoor unit,
allow system to equalize, then fully open the liquid valve and then open the
vapor service valve.
7. After leak checking is complete, apply thermal insulation around the flare
connections and all exposed refrigeration pipes. a) Seal the insulation b)
Inspect the insulation to ensure no breakages are present.
NOTE: The wiring diagrams in this guide are included as a reference. The
manufacturer has a policy of continuous product and
product data improvement and reserves the right to change design and
specifications without notice. Always check the unit nameplate and wiring
diagram for the actual unit requirements.
19
88-M4THM19-1A-EN
19 Series Multi-Split
Wiring Precautions
Electrical Notes:
1. EACH unit should be installed with its own dedicated power supply source.
The power source needs to be sized correctly for the unit capacity.
2. The rated voltage of the unit is as shown in this manual. 3. Before
turning on, verify that the voltage is within the 187~252 V range (for 208/230
V, single
phase units). 4. Always use a grounded terminal and install a separate
receptacle to supply power to the
air conditioner. For high voltage connections, flexible electrical conduit is
recommended whenever vibration transmission may create a noise problem within
the structure. 5. Use a dedicated breaker and receptacle matched to the
capacity of the air conditioner.
Outdoor Wiring Connections 1. Remove the wire clip and connect the power
connection wire and signal control wire terminals
according to the color coding. 2. Attach the wires to the terminals and make
sure they are securely fastened. Refer to wiring
diagrams in this manual. An example is provided in the figure below:
18K:
24K:
To unit A
L1 2 L2 3
To unit B
Power cord
connecting cable
A L1(1) 2 L2(3)
connecting cable
To the power supply
B N(1) 2 3
green white black red white black
(yellow (blue)
(brown) (blue) (brown)
-green)
green (yellow -green)
INDOOR UNIT A
L1 L2 POWER
white black red
(blue)
(brown)
green (yellow
-green)
INDOOR UNIT B
L1 L2
To unit A
To unit B
To unit C
Power cord
connecting cable
connecting cable
connecting cable
To the power supply
black (brown)
white green
white
red
(blue) (yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green (yellow-green)
88-M4THM19-1A-EN
20
19 Series Multi-Split
Stranded Wiring Connections Cut the wire end with a wire cutter or wire
cutting pliers, then strip the insulation about 3/8″ (10mm). 1. Using a
screwdriver, remove the terminal screw(s) on the terminal board. 2. Using a
round terminal fastener or pliers, securely clamp a round terminal to each
stripped wire
end. 3. Position the round terminal wire, and replace and tighten the terminal
screw with a screwdriver. 4. Affix and secure the power supply and connection
wiring under unit wiring clamps. 5. The wiring, including the ground wire,
between the indoor and outdoor units should be 14-4
AWG, 600 volt rated, stranded wire.
Stranded Wire
Note: Match the terminal block numbers and connection wire colors with those
of the indoor units.
21
88-M4THM19-1A-EN
19 Series Multi-Split
Electrical Connections
CAUTION Improper operation may lead to personal injury or property damage.
Size the power supply wiring according to the NEC, local code and the MCA
indicated on the unit nameplate.
Electrical Requirements
Models M4THM1918A12 M4THM1924A13 M4THM1930A14 M4THM1936A14 M4THM1942A15
Power Supply
208/230V, 60Hz, 1phase
1. Always check the unit nameplate for the MCA and MOP requirements. 2. The
fuse is located on the main electrical board. 3. A dedicated indoor unit
disconnect switch and power supply circuit may need to be installed
if local codes or jurisdictions require it. Otherwise, the indoor unit is
powered directly from the outdoor unit. 4. Install a separate disconnect at
the outdoor unit. The power supply, wiring and grounding of equipment must
comply with National, State and/or local codes. The power supply must match
with the equipment nameplate specification. 5. Improperly installed and
grounded field wiring poses fire and electrocution hazards. For high voltage
connections, flexible electrical conduit is recommended whenever vibration
transmission may create a noise problem within the structure. To avoid these
hazards you MUST follow requirements for field wiring installation and
grounding as described in the National Electrical Codes (NEC) and your State
and/or local electrical codes. All field wiring MUST be performed by qualified
personnel. Failure to follow these requirements could result in death or
serious injury. 6. The wiring, including the ground wire, between the indoor
and outdoor units should be 14-4 AWG, 600 volt rated, stranded wire, with an
absolute maximum length of 230 ft. (70m). Shorter lengths result in more
robust communication between the indoor and outdoor unit. Please select an
appropriate length for the installation conditions. The wires cannot be cut
and spliced together. 7. For the wired controller: The communication distance
between the main board and the wired controller can be up to 65 ft. (19.8m).
The standard distance is 25 ft. (7.6m).
88-M4THM19-1A-EN
22
Post Installation Checklist
Check the following points before testing the unit:
19 Series Multi-Split
NO.
Item to be checked
Possible problem
1 Have the indoor and outdoor units been securely installed?
The units may fall, vibrate or make noise.
2 Has the refrigerant leak test been completed?
Unresolved leaks may cause insufficient cooling or heating.
3 Have the pipes been properly insulated? Lack of insulation may cause condensation and water damage.
4 Have condensate drains been tested with Lack of proper drainage may cause
water?
condensation and water damage.
5 Does the voltage of the power supply
Incorrect power supply can create
comply with the voltage on the nameplate? malfunction and fire or electrocution
hazard.
6 Is the electric wiring and drain piping installed correctly?
Improper wiring and drainage can create a malfunction, fire or electrocution hazard and water damage to the unit and property.
7 Is the unit grounded properly?
8 Does the power wiring match the unit requirements?
9 Are there any obstructions near the air inlets and air outlets for the
indoor and outdoor units?
10 Are the gas valve and liquid valve of the connection pipes open completely?
Improper grounding can cause malfunction and fire or electrocution hazard.
Improper wiring can create malfunction and fire or electrocution hazard.
Improper ventilation and airflow will cause insufficient cooling and heating
and possible freezing and condensate issues at the indoor unit.
Restricted refrigerant flow may cause insufficient cooling or heating.
Test Operation:
1. Turn on main power to the units. 2. Using the remote control, press the
ON/OFF button to start operation. 3. Press the MODE button to select and test
each option for normal operation. Cycle through all
functions: AUTO, COOL, DRY, FAN and HEAT (heat pump models only). 4. Note:
When conducting this test, be mindful of the modes of operation and the
ambient
temperature ranges specified in this manual. (Suggest 0 degrees to 75 for
heating and 55 to 120 degrees for cooling.) 5. Instruct the end-product user
about basic operating, maintenance and troubleshooting functions.
23
88-M4THM19-1A-EN
19 Series Multi-Split
Refrigerant System Diagram 18K, 24K, 30K, 36K and 42K
Solenoid bypass valve
Solenoid bypass valve
Solenoid valve
EVI (evaporator vapor injection)
88-M4THM19-1A-EN
24
Electrical Connections at the Outdoor Unit
19 Series Multi-Split
connection cable C connection cable A
D connection cable B connection cable
connection cable E connection cable C
connection cable A
D connection cable B connection cable
Power cable
Power cable
1. The power cable should be put in from the hole under the connection cable
cover. 2. If connecting with two indoor units, the connection cable should be
put in from hole A and B. 3. If connecting with three indoor units, the
connection cable should be put in from hole A, B and C. 4. If connecting with
four indoor units, the connection cable should be put in from hole A, B, C and
D. 5. If connecting with five indoor units, the connection cable should be put
in from hole A, B, C, D and E. 6. All power cables and connections must be
protected with conduits and fastened securely to avoid
loosening and electric shock hazard. 7. All connection ports might not be
used, depending on the number of indoor units. Leave knockouts
intact if the port is not needed
18K:
24K:
To unit A
L1 2 L2 3
To unit B
Power cord
connecting cable
A L1(1) 2 L2(3)
connecting cable
To the power supply
B N(1) 2 3
green white black red white black
(yellow (blue)
(brown) (blue) (brown)
-green)
green (yellow -green)
INDOOR UNIT A
L1 L2 POWER
white black red
(blue)
(brown)
green (yellow
-green)
INDOOR UNIT B
L1 L2
To unit A
To unit B
To unit C
Power cord
connecting cable
connecting cable
connecting cable
To the power supply
black (brown)
white green
white
red
(blue) (yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green (yellow-green)
25
88-M4THM19-1A-EN
19 Series Multi-Split
30/36K:
42K
L1 L2
To unit A
To unit B
To unit C
To unit D
To unit E
Power cord
connecting cable
connecting cable
connecting cable
connecting cable
connecting cable
To the power supply
black (brown)
white green
white
red
(blue) (yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green
white
red
(yellow-green) (blue) black (brown)
green (yellow-green)
Wiring Diagrams
Color Key
Symbol
Symbol Color
WH White
YE Yellow
RD Red
YE/GN Yellow/Green
VT Violet
Symbol GN BN BU BK OG
Symbol Color Green Brown Blue Black Orange
Symbol COMP
Name Compressor Grounding wire
Note: A “Jumper Cap” may be used to determine fan speed and the swing angle of
horizontal louver for this model. The unit will not operate without the
correct jumper cap. If “Jumper Caps” are installed on the original electrical
board, they must be removed and installed on a replacement electrical board.
Not doing so may generate a “C5” error.
NOTE: The wiring diagrams in this guide are included as a reference. The
manufacturer has a policy of continuous product and product data improvement
and reserves the right to change design and specifications without notice.
Always check the unit nameplate and wiring diagram for the actual unit
requirements.
88-M4THM19-1A-EN
26
Wiring Diagram 18K
19 Series Multi-Split
WARNING
Please don’t touch any electronic component or terminal when the machine is
running , stopping or has been powered off for less than 30 minutes to prevent
the risk of
electric shock !
OPTIONAL
OUTTUBE OUTTUBE EXHAUST
OPTIONAL
TEMP. SENSOR
TEMP. SENSOR
STEEMNSPO. RMOFATNOR
4-WAY VALVE
M
RT1 RT2 RT3
4YV
BOTTOM BAND ELECTRONIC ELECTRONIC HEATER EXPANSION EXPANSION
VALVE A VALVE B
EH
EKV
EKV
RD RD
20K 15K 50K
VT
VT
INDOOR UNIT B
XT2
WH(BU) BK RD(BN)
N(1) BU 2 3 BN
GN(YEGN)
G
WH(BU)
XT1
L1(1)
BK RD(BN) GN(YEGN)
2 L2(3) TERMINAL
BLOCK G
INDOOR UNIT A
L1 WH(BU) L2 BK(BN)
GN(YEGN)
POWER
G
MAGNETIC RING
L2 L3 GY L2 L3
BK
T-SENSOR COM-INNER
L2 L3 BU N(AC-N)
OFAN 4WAY
HEAT-B
WH FA
BK FB
AP1:PRINTED CIRCUIT BOARD
L2 L3 BN AC-L E
CN2
OVC-COMP
TUBE-A
TUBE-B
YEGN G
BU YE RD X1
WH
BK
BK
RD
BK
RD
L1 L1 L1
WH WH
BU YE RD
RT4 RT5
RT6 RT7
QA
YA
QB
YB
UV
SAT
COMP. W
MAGNETIC RING
GAS PIPE TEMP.SENSOR LIQUID PIPE TEMP.SENSOR GAS PIPE TEMP.SENSOR LIQUID PIPE
TEMP.SENSOR
600007066178
COMP.
OVERLOAD PROTECTOR
OPTIONAL
Wiring Diagram 24K
POWER
TERMINAL BLOCK
L1 BK(BN)
L1
BN BU
L2 WH(BU)
L2
GN(YEGN) XT1
G
BU BN
INDOOR UNIT A
TERMINAL BLOCK
WH(BU) N(1)
BK 2
RD(BN) 3
GN(YEGN) XTA
G
BU BN
INDOOR UNIT B
TERMINAL BLOCK WH(BU)
N(1)
BK 2
RD(BN)
3
GN(YEGN)
XTB
G
BU BN
TERMINAL BLOCK WH(BU)
N(1) BK
2 RD(BN)
3 GN(YEGN) XTC
G
INDOOR UNIT C
WARNING
Please don’t touch any electronic component or terminal when the machine is
running , stopping or has been powered off for less than 30 minutes to prevent
the risk of electric shock!
COM-INNER
AP1: PRINTED CIRCUIT BOARD
MAGNETIC RING L2 L2
BK GY WH
ELECTRONIC EXPANSION VALVE A
EKV
YEGN G
AC-L N
T-SENSOR E
4WAY
ELECTRONIC EXPANSION VALVE B
EKV
ELECTRONIC EXPANSION VALVE C
EKV
CN2 HEAT-B
RT1 50K
EXHAUST TEMP. SENSOR
RT2 15K
OUTROOM TEMP. SENSOR
RT3 20K
OUTTUBE TEMP. SENSOR
VT
VT
4YV
4-WAY
VALVE
BU L1 YE L1 RD L1
X1 BU YE RD
U V COMP W
MAGNETIC RING
RD EH RD
COMP.
BOTTOM BAND OPTIONAL HEATER
WH FA
TUBE-A
BK FB
RD FC
TUBE-B
OFAN
TUBE-C
OVC-COMP
WH SAT WH
M1 FAN MOTOR
OVERLOAD PROTECTOR
OPTIONAL
WH BK RD
RT4 RT5 QA YA Gas Liquid Valve Valve Temp. Temp. Sensor Sensor
BK
BK RD
RT6 RT7
QB YB Gas Liquid Valve Valve Temp. Temp. Sensor Sensor
RD
BK RD
RT8 RT9
QC YC Gas Liquid Valve Valve Temp. Temp. Sensor Sensor
600007066388
27
88-M4THM19-1A-EN
19 Series Multi-Split
Wiring Diagram 30K & 36K
POWER
TERMINAL
BLOCK
L1
BK(BN)
L1
WH(BU)
L2
L2
GN(YEGN) XT
G
INDOOR UNIT A
INDOOR UNIT B
TERMINAL BLOCK BU
WH(BU) N(1)
BK 2
RD(BN) 3
GN(YEGN)
XTA G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) 3
GN(YEGN)
XTB G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK 2
RD(BN) 3
GN(YEGN)
XTC
BU
G
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) 3
GN(YEGN)
XTD
G
INDOOR UNIT C
INDOOR UNIT D
MAGNETIC RING
BN
L2
BU
L2
BN BK
BN GY
BN WH
BN BU RD
AC-L
AP2
L-OUT BN
AC-L
BU
N
Main Board N-OUT
N
E1 YEGN
G
ELECTRONIC EXPANSION EKV VALVE D
ELECTRONIC EXPANSION EKV VALVE C
ELECTRONIC EXPANSION EKV VALVE B
ELECTRONIC EXPANSION EKV VALVE A
FD (yellow)
FC (red)
FB (black)
FA (white)
WH
HPP
WH HPS P
HIGH PRESSURE SWITCH
4WAY
VT
VT
4YV
4-WAY VALVE
OPTIONAL
U(BU) V(YE) W(RD)
MAGNETIC RING
BU L1
YE L1
RD L1
U V COMP W
COMP.
WH
SAT
OVERLOAD
COMP-OVC
PROTECTOR OPTIONAL
WH
RD HEAT-B
RD
BOTTOM
BAND
OPTIONAL
HEATER EH
WARNING
Please don’t touch any electronic component or terminal when the
machine is running , stopping or
has been powered off for less than 30 minutes to prevent the risk of electric
shock!
N2
COM-IN
AP1: Main Board
T-SEN
CN803
OFAN CN802
20K
15K
50K
RT1
RT2
RT3
OUTTUBE OUTROOM EXHAUST TEMP. TEMP. TEMP. SENSOR SENSOR SENSOR
20K 20K 20K 20K
RT2A
RT2B RT2C
LIQUID PIPE TEMP. SENSOR
RT2D
20K 20K 20K 20K
RT3A
RT3B RT3C
GAS PIPE TEMP. SENSOR
RT3D
M
FAN MOTOR
X1
600007066451
Wiring Diagram 42K
POWER TERMINAL
BLOCK L1 BK(BN) L1 L2 WH(BU) L2
GN(YEGN) XT G
INDOOR UNIT E INDOOR UNIT D INDOOR UNIT C INDOOR UNIT B INDOOR UNIT A
TERMINAL BLOCK BU
WH(BU) N(1)
BK
2
RD(BN)
GN(YEGN) 3
XTA G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) 3
GN(YEGN)
XTB G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) GN(YEGN) 3
XTC G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) GN(YEGN)
3
XTD G
BU
TERMINAL BLOCK
WH(BU) N(1)
BK
2
RD(BN) 3 GN(YEGN)
XTE
G
MAGNETIC RING
BN L2 BU L2
BN BK
BN GY
BN WH
BN RD
BN BU OG
N2
AC-L AP2 N Main Board
L-OUT BN N-OUT BU
E1
AC-L N
YEGN G
ELECTRONIC EXPANSION EKV VALVE E
ELECTRONIC
EXPANSION VALVE D
EKV
ELECTRONIC EXPANSION EKV VALVE C
ELECTRONIC EXPANSION EKV VALVE B
ELECTRONIC EXPANSION EKV VALVE A
FE (green)
FD (yellow)
FC (red)
FB (black)
FA (white)
COM-IN AP1: Main Board
HPP
WH WHHPS P
HIGH PRESSURE SWITCH
4WAY
VT
VT
4YV 4-WAY VALVE OPTIONAL
U(BU) V(YE) W(RD)
MAGNETIC RING
BU L1 YE L1
RD L1
U V COMP W
COMP.
COMP-OVC
WH
SAT
OVERLOAD PROTECTOR
OPTIONAL
WH
RD
BOTTOM
HEAT-B
BAND OPTIONAL
RD
EH HEATER
OFAN
M FAN MOTOR X1
WARNING
Please don’t touch any electronic component or terminal when the machine is
running , stopping or has been powered off for less than 30 minutes to prevent
the risk of electric shock!
T-SEN
CN803
CN802
20K 15K 50K 20K 20K 20K 20K 20K
RT1 RT2 RT3
RT2A RT2B RT2C RT2D RT2E
OUTTUBE OUTROOM EXHAUST TEMP. TEMP. TEMP. SENSOR SENSOR SENSOR
LIQUID PIPE
TEMP. SENSOR
20K 20K 20K 20K 20K
RT3A RT3B RT3C RT3D RT3E GAS PIPE TEMP. SENSOR
60000706645101
88-M4THM19-1A-EN
28
Dimensional Diagrams
18K Units
11 13/16 (299.72)
19 Series Multi-Split
29 21/64 (744.72)
21 21/32 (549.91)
13 55/64 (351.79)
32 23/64 (821.69)
13 5/64 (331.978)
24K Units
13 25/64 (340.10)
20 5/32 (511.81) 35 (889)
25 63/64 (659.89)
25 3/4 (654.05)
15 53/64 (401.82)
37 61/64 (963.93)
14 39/64 (370.84)
22 7/16 (569.72)
The dimensions in these drawings are rounded according to standard
measurement.
29
Unit: inch (mm)
88-M4THM19-1A-EN
19 Series Multi-Split
Dimensional Diagrams
30K-36K-42K Units
14 17/32 (369.06)
37 1/8 (942.97)
32 33/64 (825.75) 15 19/32 (395.98)
16 13/16 (426.974)
40 5/32 (1019.81)
Unit: inch (mm)
25 (635)
The dimensions in these drawings are rounded according to standard measurement.
88-M4THM19-1A-EN
30
19 Series Multi-Split
Troubleshooting
WARNING Improper operation may lead to personal injury or casualty.
· Turn off the main power switch immediately if a malfunction is detected.
Contact the installing dealer or qualified service technician. If the unit
continues to run during a malfunction, the unit may be damaged or electric
shock or fire may occur.
· Do not try to move or reposition the units. Please contact the
servicing/installing dealer to
repair or move the units.
· Check the following items before contacting the dealer or qualified service
technician.
Condition
Unit doesn’t run
When unit is started immediately after it is just turned off
When power is turned on
Mist comes from the unit
When cooling cycle starts
Sound comes from the unit
Slight ticking sound is heard when unit starts
Possible Reason Overload protection switch delays unit start up for three
minutes
The unit is in standby for one minute Indoor high humidity air is cooled
rapidly This sound occurs when the electronic expansion valve initializes.
The unit blows out dust
The unit emits odor
Indoor unit still runs after reaching temperature setpoint. Mode conflict
There is sound when cooling There is sound when unit starts or stops There is
slight sound when unit is running or after running Cracking or popping sound
is heard in heating and defrost When the unit has been off for a period of
time When the unit is operating
Fan runs continuously even after reaching desired setpoint COOL or HEAT mode
lockout
The sound of gas refrigerant flowing in unit This sound occurs when gas
refrigerant starts or stops flowing. The sound of the drainage system
operating.
This sound occurs when the unit panels expand or contract due to temperature
change.
Dust in indoor unit is blown out
If the room odor absorbed by the unit is blown out again, it is an
environmental issue
Indoor fan will continue to operate for constant filtration and for
temperature sensing When the indoor operating mode conflicts with that of the
outdoor unit, the indoor fault indicator will flash and conflict will be shown
on the wired controller after 5 minutes. Indoor unit stops running and the
outdoor unit changes its mode of operation to match the indoor unit, then the
unit will go back to normal. COOL mode doesn’t conflict with DRY mode. FAN
mode will conflict with HEAT mode.
NOTE: If the problem persists after checking the above items and taking appropriate measures, please stop operation of the unit immediately and contact your local service agency or dealer. Diagnostics and repairs should be completed by a professional service technician.
31
88-M4THM19-1A-EN
19 Series Multi-Split
Error Codes
The error code will be displayed on the wired controller and the main board of the outdoor unit. The meaning of each error is as shown in the table below.
Error/Malfunction
Compressor runs Defrost Anti-freeze protection IPM protection AC over-current
protection Over-burden protection Compressor exhaust high temperature
protection Compressor overload protection Power protection EEPROM reads and
write protection Low PN voltage protection
Over-voltage protection for PN
PFC Protection PFC module temperature protection Low pressure protection High
pressure protection Limit/decline frequency (electric current) Frequency limit
(exhaust) Frequency limit (over-burden) Outdoor ambient sensor malfunction
Outdoor tube sensor malfunction Exhaust sensor malfunction Normal operation –
reaching temperature setpoint Frequency limit (power) Outdoor fan malfunction
Frequency limit (PFC module temperature) PFC module sensor malfunction Liquid
pipe temperature sensor malfunction of port A Gas pipe temperature sensor
malfunction of port A Liquid pipe temperature sensor malfunction of port B Gas
pipe temperature sensor malfunction of port B
Yellow Light Flash once Flash twice Flash 3 times Flash 4 times Flash 5 times
Flash 6 times
Flash 7 times
Flash 8 times Flash 9 times
Flash 11 times
Flash 12 times Flash 13 times Flash 14 times
Flash 15 times
Flash 17 times Flash 18 times
The Indicator Display Red Light
Flash 1 time Flash 2 times Flash 3 times Flash 6 times Flash 5 times Flash 7
times Flash 8 times Flash 13 times Flash 14 times Flash 15 times Flash 16
times Flash 17 times
Flash 18 times
Flash 19 times
Flash 20 times
Green Light
Indoor Display
H1 E2 H5 E5 E8 E4 E4 L9
PL PH HC oE E3 E1
F3 F4 F5
oE
88-M4THM19-1A-EN
32
19 Series Multi-Split
Name of malfunction
Liquid pipe temperature sensor malfunction of port C Gas pipe temperature
sensor malfunction of port C Liquid pipe temperature sensor malfunction of
port D Gas pipe temperature sensor malfunction of port D Liquid pipe
temperature sensor malfunction of port E Gas pipe temperature sensor
malfunction of port E Outlet side of condenser tube sensor malfunction
Communication is normal
Communication failure between indoor unit and outdoor unit
Indoor ambient sensor malfunction Indoor evaporate sensor malfunction Mode
conflict Refrigerant recovery mode Jumper cap malfunction protection
Yellow light
The indicator Display Red light
Flash 21 times Flash 22 times Flash 23 times Flash 24 times Flash 25 times
Flash 26 times Flash 27 times
Green light
Flash 7 times (=Indoor unit
number ) Often bright (indoor unit all communication
failure)
Indoor Display
F1 F2 E7 Fo C5
33
88-M4THM19-1A-EN
19 Series Multi-Split
List of Resistance for Temperature Sensor
Resistance Table of Ambient Temperature Sensor for Indoor and Outdoor
Units(15K)
Temp(oC) -19 -18 -17 -16 -15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Resistance(k) 138.1 128.6 121.6 115 108.7 102.9 97.4 92.22 87.35 82.75 78.43 74.35 70.5 66.88 63.46 60.23 57.18 54.31 51.59 49.02 46.6 44.31 42.14 40.09 38.15 36.32 34.58 32.94 31.38 29.9 28.51 27.18 25.92 24.73 23.6 22.53 21.51 20.54 19.63
Temp(oC) 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
Resistance(k) 18.75 17.93 17.14 16.39 15.68 15 14.36 13.74 13.16 12.6 12.07 11.57 11.09 10.63 10.2 9.779 9.382 9.003 8.642 8.297 7.967 7.653 7.352 7.065 6.791 6.529 6.278 6.038 5.809 5.589 5.379 5.197 4.986 4.802 4.625 4.456 4.294 4.139 3.99
Temp(oC) 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97
Resistance(k) 3.848 3.711 3.579 3.454 3.333 3.217 3.105 2.998 2.896 2.797 2.702 2.611 2.523 2.439 2.358 2.28 2.206 2.133 2.064 1.997 1.933 1.871 1.811 1.754 1.699 1.645 1.594 1.544 1.497 1.451 1.408 1.363 1.322 1.282 1.244 1.207 1.171 1.136 1.103
Temp(oC) 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
Resistance(k) 1.071 1.039 1.009 0.98 0.952 0.925 0.898 0.873 0.848 0.825 0.802 0.779 0.758 0.737 0.717 0.697 0.678 0.66 0.642 0.625 0.608 0.592 0.577 0.561 0.547 0.532 0.519 0.505 0.492 0.48 0.467 0.456 0.444 0.433 0.422 0.412 0.401 0.391 0.382
88-M4THM19-1A-EN
34
19 Series Multi-Split
Resistance Table of Tube Temperature Sensors for Indoor and Outdoor (20K)
Temp(oC) Resistance(k)
Temp(oC) Resistance(k)
Temp(oC) Resistance(k)
-19
181.4
20
25.01
59
5.13
-18
171.4
21
23.9
60
4.948
-17
162.1
22
22.85
61
4.773
-16
153.3
23
21.85
62
4.605
-15
145
24
20.9
63
4.443
-14
137.2
25
20
64
4.289
-13
129.9
26
19.14
65
4.14
-12
123
27
18.13
66
3.998
-11
116.5
28
17.55
67
3.861
-10
110.3
29
16.8
68
3.729
-9
104.6
30
16.1
69
3.603
-8
99.13
31
15.43
70
3.481
-7
94
32
14.79
71
3.364
-6
89.17
33
14.18
72
3.252
-5
84.61
34
13.59
73
3.144
-4
80.31
35
13.04
74
3.04
-3
76.24
36
12.51
75
2.94
-2
72.41
37
12
76
2.844
-1
68.79
38
11.52
77
2.752
0
65.37
39
11.06
78
2.663
1
62.13
40
10.62
79
2.577
2
59.08
41
10.2
80
2.495
3
56.19
42
9.803
81
2.415
4
53.46
43
9.42
82
2.339
5
50.87
44
9.054
83
2.265
6
48.42
45
8.705
84
2.194
7
46.11
46
8.37
85
2.125
8
43.92
47
8.051
86
2.059
9
41.84
48
7.745
87
1.996
10
39.87
49
7.453
88
1.934
11
38.01
50
7.173
89
1.875
12
36.24
51
6.905
90
1.818
13
34.57
52
6.648
91
1.736
14
32.98
53
6.403
92
1.71
15
31.47
54
6.167
93
1.658
16
30.04
55
5.942
94
1.609
17
28.68
56
5.726
95
1.561
18
27.39
57
5.519
96
1.515
19
26.17
58
5.32
97
1.47
Temp(oC) 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
Resistance(k) 1.427 1.386 1.346 1.307 1.269 1.233 1.198 1.164 1.131 1.099 1.069 1.039 1.01 0.983 0.956 0.93 0.904 0.88 0.856 0.833 0.811 0.77 0.769 0.746 0.729 0.71 0.692 0.674 0.658 0.64 0.623 0.607 0.592 0.577 0.563 0.549 0.535 0.521 0.509
35
88-M4THM19-1A-EN
19 Series Multi-Split
Resistance Table of Discharge Temperature Sensor for Outdoor(50K)
Temp(oC) Resistance(k)
Temp(oC) Resistance(k)
Temp(oC) Resistance(k)
-29
853.5
10
98
49
18.34
-28
799.8
11
93.42
50
17.65
-27
750
12
89.07
51
16.99
-26
703.8
13
84.95
52
16.36
-25
660.8
14
81.05
53
15.75
-24
620.8
15
77.35
54
15.17
-23
580.6
16
73.83
55
14.62
-22
548.9
17
70.5
56
14.09
-21
516.6
18
67.34
57
13.58
-20
486.5
19
64.33
58
13.09
-19
458.3
20
61.48
59
12.62
-18
432
21
58.77
60
12.17
-17
407.4
22
56.19
61
11.74
-16
384.5
23
53.74
62
11.32
-15
362.9
24
51.41
63
10.93
-14
342.8
25
49.19
64
10.54
-13
323.9
26
47.08
65
10.18
-12
306.2
27
45.07
66
9.83
-11
289.6
28
43.16
67
9.49
-10
274
29
41.34
68
9.17
-9
259.3
30
39.61
69
8.85
-8
245.6
31
37.96
70
8.56
-7
232.6
32
36.38
71
8.27
-6
220.5
33
34.88
72
7.99
-5
209
34
33.45
73
7.73
-4
198.3
35
32.09
74
7.47
-3
199.1
36
30.79
75
7.22
-2
178.5
37
29.54
76
7.00
-1
169.5
38
28.36
77
6.76
0
161
39
27.23
78
6.54
1
153
40
26.15
79
6.33
2
145.4
41
25.11
80
6.13
3
138.3
42
24.13
81
5.93
4
131.5
43
23.19
82
5.75
5
125.1
44
22.29
83
5.57
6
119.1
45
21.43
84
5.39
7
113.4
46
20.6
85
5.22
8
108
47
19.81
86
5.06
9
102.8
48
19.06
87
4.90
Temp(oC) 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
Resistance(k) 4.75 4.61 4.47 4.33 4.20 4.08 3.96 3.84 3.73 3.62 3.51 3.41 3.32 3.22 3.13 3.04 2.96 2.87 2.79 2.72 2.64 2.57 2.50 2.43 2.37 2.30 2.24 2.18 2.12 2.07 2.02 1.96 1.91 1.86 1.82 1.77 1.73 1.68 1.64
88-M4THM19-1A-EN
36
19 Series Multi-Split
General Maintenance
Regular checks, maintenance and care should be performed by professional
personnel, which will prolong the unit life span.
Outdoor Heat Exchanger
The outdoor heat exchanger should be checked and cleaned once every two
months. Use a vacuum cleaner with a nylon brush to clean up dust and debris on
the surface of the heat exchanger. Blow away dust by compressed air if
available. Never use water to wash the heat exchanger.
Drain Pipe
Regularly check to see if the drain pipe is clogged in order to ensure drain
condensate doesn’t overflow and cause water damage.
Check Before Seasonal Use
1. The inlet and outlet of the indoor and outdoor units are not clogged or
obstructed. 2. The power and communication cables are securely attached and
that there is no visible
damage to any of the electrical wiring. 3. The batteries of the wireless
remote controller have been replaced. 4. The filter screen has been cleaned
and replaced securely. 5. Apply power to the outdoor unit 8 hours before
operating the unit so as to preheat the
compressor. 6. The outdoor and indoor units are installed securely. 7. If
there is anything abnormal, please contact the installing dealer or qualified
service
technician.
Maintenance After Seasonal Use
1. Cut off the main power supply of the unit. A power disconnect should be
located near the outdoor unit.
2. Clean the indoor unit filters. 3. Clean any dust and debris on the indoor
and outdoor units.
Parts Replacement
Purchase parts from the installing or servicing center or dealer if necessary.
NOTE: During leakage testing, never mix oxygen, ethyne (acetylene) or other
dangerous gases into the refrigeration circuit. Nitrogen should be used for
leakage testing.
After-Sales Service
In the event you have problems with the unit or require service, please
contact your local installing/servicing dealer.
37
88-M4THM19-1A-EN
About Trane and American Standard Heating and Air Conditioning Trane and American Standard create comfortable, energy efficient indoor environments for residential applications. For more information, please visit www.trane.com or www.americanstandardair.com
CONFORMSTO ULSTD.1995 CERTIFIEDTO CSASTD.C22.2 N0.236
3097844 The AHRI Certified mark indicates company participation in the AHRI Certification program. For verification of individual certified products, go to ahridirectory.org.
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are committed to using environmentally conscious print practices.
88-M4THM19-1A-EN 31 Jan 2023 Supersedes (New)
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