Carrier 38LUVH025N-1 User manual

LUV INVERTER SERIES
Service Manual
42/38LUVH025N-1
42/38LUVH035N-1
42/38LUVH045N-1
42/38LUVH055N-1
42/38LUVH065N-1
42/38LUVH075N-1

CONTENTS
PART1. Safety Precaution
PART2. Outline and Dimensions
PART3. Refrigerant Cycle Diagram
PART4. Wiring Diagram
PART5. Installation Details
PART6. Operation Description
PART7. Trouble Shooting
PART8. Capacity Table

PART1, 1
PART1. Precaution
1. Safety Precaution
To prevent injury to the user or other people and property damage, the following
instructions must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service the unit, be sure to read this service manual at first.
2. Warning
Installation
Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated
circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller, a qualified electrician, or an authorized
service center.
Do not disassemble or repair the product, there is risk of fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
Be caution when unpacking and installing the product.
Sharp edges could cause injury, be especially careful of the case edges and the fins on the
condenser and evaporator.

PART1, 2
For installation, always contact the dealer or an authorized service center.
Do not install the product on a defective installation stand.
Be sure the installation area does not deteriorate with age.
If the base collapses, the air conditioner could fall with it, causing property damage, product failure,
and personal injury.
Do not let the air conditioner run for a long time when the humidity is very high and a
door or a window is left open.
Take care to ensure that power cable could not be pulled out or damaged during
operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug during operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet hands.
Do not place a heater or other appliance near the power cable.
There is risk of fire and electric shock.
Do not allow water to run into electrical parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for a long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and open a window for ventilation before
turn the product on.
If strange sounds or smoke comes from product, turn the breaker off or disconnect the
power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in storm or hurricane. If possible, remove the
product from the window before the hurricane arrives.

PART1, 3
There is risk of property damage, failure of product, or electric shock.
Do not open the inlet grill of the product during operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
There is risk of physical injury, electric shock, or product failure.
When the product is soaked, contact an authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when operating it together with a stove etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or maintaining the product.
There is risk of electric shock.
When the product is not be used for a long time, disconnect the power supply plug or
turn off the breaker.
There is risk of product damage or failure, or unintended operation.
Take care to ensure that nobody could step on or fall onto the outdoor unit.
This could result in personal injury and product damage.
CAUTION
Always check for gas (refrigerant) leakage after installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is drained away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
It can avoid vibration of water leakage.
Do not install the product where the noise or hot air from the outdoor unit could damage
the neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and transport the product.
Do not install the product where it will be exposed to sea wind (salt spray) directly.

PART1, 4
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operation.
Operational
Do not expose the skin directly to cool air for long time. (Do not sit in the draft).
Do not use the product for special purposes, such as preserving foods, works of art etc.
It is a consumer air conditioner, not a precision refrigerant system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the plastic parts of the product.
Do not touch the metal parts of the product when removing the air filter. They are very
sharp.
Do not step on or put anything on the product. (outdoor units)
Always insert the filter securely. Clean the filter every two weeks or more often if
necessary.
A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or
damage.
Do not insert hands or other objects through air inlet or outlet while the product is
operated.
Do not drink the water drained from the product.
Use a firm stool or ladder when cleaning or maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with new ones of the same type. Do not
mix old and new batteries or different types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin or clothes, wash it well with clean
water. Do not use the remote of the batteries have leaked.

PART2, 1
PART2. Outline and Dimensions
1. Indoor Unit
Model
W
D
H
42LUVH025N-1
790
195
265
42LUVH035N-1
920
225
292
42LUVH045N-1
920
225
292
42LUVH055N-1
42LUVH065N-1
1080
230
330
42LUVH075N-1
1250
230
325

PART2, 2
2. Outdoor Unit
Model
L1
W1
H
L2
W2
38LUVH025N-1
38LUVH035N-1
760
285
590
530
290
38LUVH045N-1
760
285
590
530
290
38LUVH055N-1
845
320
700
560
335
38LUVH065N-1
38LUVH075N-1
900
315
860
590
333

PART3, 1
PART3. Refrigerant Cycle Diagram
INDOOR OUTDOOR
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE
REVERSING VALVE
(Heating Model only)
COOLING
HEATING
ACCUMULATOR

PART4, 1
PART4. Wiring Diagram
1. Indoor Unit
42LUVH025N-1
42LUVH035N-1

PART4, 2
42LUVH045N-1
42LUVH055N-1, 42LUVH065N-1

PART4, 3
42LUVH075N-1

PART4, 4
2. Outdoor Unit
38LUVH025N-1, 38LUVH035N-1
38LUVH045N-1

PART4, 5
38LUVH055N-1, 38LUVH065N-1
38LUVH075N-1

PART5, 1
PART5. Installation Details
1. Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening torque
mm
inch
N.cm
N.cm
Ф6.35
1/4
1500(153kgf.cm)
1600(163kgf.cm)
Ф9.52
3/8
2500(255kgf.cm)
2600(265kgf.cm)
Ф12.7
1/2
3500(357kgf.cm)
3600(367kgf.cm)
Ф16
5/8
4500(459kgf.cm)
4700(479kgf.cm)
Ф19
3/4
6500(663kgf.cm)
6700(683kgf.cm)
2. Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Rated current of appliance
Nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1
>10 and ≤16
1.5
>16 and ≤25
2.5
The cable size and the current of the fuse or switch are determined by the maximum current indicated
on the nameplate which located on the side panel of the unit. Please refer to the nameplate before
selecting the cable, fuse and switch.

PART5, 2
3. Pipe length and the elevation
The pipe length and refrigerant amount:
Model
Pipe size
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Length
A (m)
Additional
refrigerant
(g/m)
Gas
Liquid
42/38LUVH025N-1
3/8’’
(Ф9.53)
1/4’’
(Ф6.35)
5
8
20
20
42/38LUVH035N-1
42/38LUVH045N-1
1/2’’
(Ф12.7)
1/4’’
(Ф6.35)
5
8
20
20
42/38LUVH055N-1
42/38LUVH065N-1
42/38LUVH075N-1
5/8’’
(Ф16.0)
3/8’’
(Ф9.53)
5
10
25
40
Caution:
The capacity test is based on the standard length and the maximum permissive length is based on the
system reliability.
The oil trap should be installed per 5-7 meter

PART5, 3
4. Air purging with vacuum pump
Air and moisture in the refrigerant system have undesirable effects as below:
●Pressure in the system rises.
●Operating current rises.
●Cooling or heating efficiency drops.
●Moisture in the refrigerant circuit may freeze and block capillary tubing.
●Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Air purging with vacuum pump
(Indoor unit) (Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
adaptor
Lo Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter Pressure
gauge
-76cmHg
Handle Lo
Charge hose Charge hose
(Outdoor unit)
Close
Three-way valve
Procedure
1) Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold valve
charge.
2) Connect the charge hose connection to the vacuum pump.
3) Fully open the handle Lo of the manifold valve.
4) Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare nut of the
Lo valve on the gas pipe side and check the air is entering. (Operation noise of the vacuum pump
changes and a compound meter indicates 0 stead of minutes)
5) After the evacuation is complete, fully close the handle Lo valve of the manifold valve and stop the

PART5, 4
operation of the vacuum pump. Make evacuation for 15 minutes or more and check the compound
meter indicates -76cmHg.
6) Turn the stem of the Hi valve about 45°counterclockwise for 6 or 7seconds after the gas coming
out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a
little higher than the atmosphere pressure.
7) Remove the charge hose from the Lo pressure charge hose.
8) Fully open the Hi and Lo packed valve.
9) Securely tighten the cap of the packed valve.
Gas leak check
Soap water method
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles
come out, the pipes have leakage.

PART6, 1
PART6. Operation Description
1. Abbreviation
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
2. Main Protection
2.1 Three Minutes Delay at restart for compressor
1 minute delay for the 1st time start-up and 3 minutes delay for others.
2.2 Temperature protection of compressor top
The unit will stop working when the compressor top temperature protector cut off, and will restart after
the compressor top temperature protector restart.
2.3 Temperature protection of compressor discharge
When the compressor discharge temperature is getting higher, the running frequency will be limited as
below rules:
---Compressor discharge temperature T5>115℃for 5s, compressor stops.
---108<T5<115℃, decrease the frequency to the lower level every 3 minutes.
---90<T5<105℃, keep running at the current frequency.
----T5<90℃, no limit for frequency.
2.4 Fan Speed is out of control
When Indoor Fan Speed keeps too low (300RPM) for certain time, the unit will stop and the LED will
display the failure
2.5 Inverter module Protection
The Inverter module has a protection function about current, voltage and temperature. If these
protections happen, the corresponding code will display on indoor unit and the unit will stop working.
2.6 Indoor fan delayed open function
When the unit starts up, the louver will be active immediately and the indoor fan will open 10s later.
If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function.

PART6, 2
2.7 Compressor preheating functions
Preheating permitting condition:
If T4(outdoor ambient temperature)＜3℃and the machine connects to power supply newly or if T4＜
3℃and compressor has stopped for over 3 hours, the compressor heating cable will work.
Preheating mode:
Aweak currentflow through the coil of compressor from the wiring terminal of the compressor, then the
compressor is heated without operation.
Preheating release condition:
If T4＞5℃or the compressor starts running, the preheating function will stop.
2.8 Zero crossing detection error protection
If AC detects time interval is not correct for continuous 240s, the unit will stop and the LED will display
the failure. The correct zero crossing signal time interval should be between 6-13ms.
3 Operation Modes and Functions
3.1 Fan mode
(1) Outdoor fan and compressor stop.
(2) Temperature setting function is disabled, and no setting temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) Auto fan:
27.5
27
High
Low
25
Medium
25.5
3.2 Cooling Mode
3.2.1 Compressor running rules
The maximum operation frequency of compressor after starting submits to following rule.