MRCOOL DUCT-09H Olympus Ducted Mini Split Air Handler Owner’s Manual

: June 13, 2024
: MrCOOL

MRCOOL DUCT-09H Olympus Ducted Mini Split Air Handler Owner’s Manual

Safety Precautions

Read Before Using

Incorrect usage may cause serious damage or injury.

The seriousness of potential damage or injuries is classiﬁed as either a WARNING or CAUTION

WARNING

_ _DO NOT__ modify the length of the power supply cord or use an extension cord to power the unit.
_ _DO NOT__ share the electrical circuit with other appliances. Improper or insuﬃcient power supply can cause ﬁre or electrical shock.
_ _DO NOT__ expose your body directly to the cool air for prolonged periods of time.
_ _DO NOT__ insert ﬁngers or foreign objects into air inlet / outlet vents.
_ _DO NOT__ attempt to repair, relocate, or modify the unit yourself. Always contact your qualiﬁed serviceprofessional if any of this is required.
_ _DO NOT__ allow combustible materials within 3 feet (1 meter ) of unit; or store combustible gas / vapor emitting materials (e.g. gas cans, rags used with solvents) within the same enclosed area as operating unit.
_ _DO NOT__ allow children to play with the air conditioner. Children should be supervised around the unit atall times.

Installation must be performed by an authorized technician according to installationImproper installation may cause water leakage, electrical shock, or ﬁre.
In North America, installation must be performed in accordance with the requirement of NEC and CEC (by authorized personnel ) Contact an authorized service technician for repair or maintenance of the unit.
This appliance is not intended for use by children under the age of 8, or persons with reduced physical, sensory or mental capabilities, unless they are supervised or have been given instruction concerning safe usage and understand the hazards involved by a person responsible for their
In the event of any abnormalities, such as the smell of burning, immediately turn oﬀ power to the unit and contact an authorized service

Safety Precautions

CAUTION

_ _DO NOT__ touch switches with a wet hand. It may cause electric shock. DO NOT use the device for any other purpose than the intended use. DO NOT expose plants or animals directly to the airﬂow.
_ _DO NOT__ place food, precision instruments, plants, animals, paint, etc. on the unit.
_ _DO NOT__ clean the interior unit with water.
_ _DO NOT__ use combustible cleaning agents as this could cause ﬁre or deformation. DO NOT place burning objects near the unit or directly in the path of its airﬂow. DO NOT step on or place objects on exterior unit.
_ _DO NOT__ allow unit to run for extended periods with doors and/or windows open or in extremehumidity.

If the unit is to be used in conjunction with other heaters, the air should be refreshed periodically, otherwise there is a risk of reduced
Switch unit oﬀ during storms to avoid electrical damage.
On the interior unit, check that the drainage line is correctly connected to avoid
On the exterior unit, check that condensation water can run oﬀ unhindered to avoid
The unit must be earthed (grounded) in accordance with local
For electrical safety, we recommend that you install an earth leakage circuit-breaker.
If the power cable is damaged, it must be replaced by the manufacturer, its service agent or similarly qualiﬁed persons in order to avoid a

Note about Flourinated Gasses

This air-conditioning unit contains ﬂourinated
For speciﬁc information on the type of gas and the amount, please refer to the relevant label on theunit itself.
Installation, service, maintenance and repair of this unit must be performed by a certiﬁed technician.
Product recycling must be performed by a certiﬁed
If the system has a leak-detection system installed, it should be checked for leaks at least every 12months.
Keep a record of all leak checks for the lifetime of the

Part Names

The air conditioner consists of the indoor unit, the outdoor unit, the connecting pipe and the remote control.

For inverter type, this switch is used for after-sales servicepurpose only, the user should not push it.
For ﬁxed-frequency type, this function is used to operate the unit temporarily in case you misplace the remote control or its batteries are exhausted. Two modes including FORCED AUTO and FORCED COOL can be selected through the TEMPORARY BUTTON on the air-in grill control box of the indoor Once you push this button, the air conditioner will run in such order:

FORCED AUTO , FORCED COOL , OFF , and back to FORCED AUTO.

FORCED AUTO

The OPERATION lamp is lit, and the air conditioner will run under FORCED AUTO mode. The remote control operation isenabled to operate according to the received signal. (See the Remote Control Manual packaged with the unit for details.

FORCED COOL

The OPERATION lamp ﬂashes, the air conditioner will turn to FORCED AUTO after it is enforced to cool with a wind speed of

HIGH for 30 minutes. The remote control operation is disabled.

OFF

The OPERATION lamp goes oﬀ. The air conditioner is OFF while the remote control operation is enabled

NOTE

All the pictures in this manual are for explanation purposes only. They may be slightly diﬀerent from the unit you purchased (depending on model). The actual shape may vary.

Operating Instructions

Operate the unit within the temperature ranges listed in the table below for safe and eﬃcient operation

MODE

| OUTDOOR TEMPERATURE| ROOM TEMPERATURE
---|---|---

Cooling Operation

| 32 °F~122°F / 0°C ~ 50°C| ****

62°F ~90°F (17°C~32°C)

5 °F~122°F / -15°C ~ 50°C

(for the models with low temperature cooling system)

Heating Operation (cooling only type without)| ****

5°F~76°F / -15°C ~ 24°C

| 32°F~86°F (0°C~30°C)
Dry Operation| ****

32 °F~122°F / 0°C ~ 50°C

| 62°F ~90°F (17°C~32°C)

NOTE

If air conditioner is used outside the above conditions, it may cause the unit to function
The air conditioner may produce condensation when the humidity in elevated in the To reduce this issue, keep the door and windows closed.

Three-Minute Protection Feature

A protection feature prevents the air conditioner from being activated for approximately 3 minutes when it restarts immediately after operation.

Power Failure

Power failure during operation will stop the unit completely.

The OPERATION lamp on the indoor unit will startﬂashing when power is restored.
To restart operation, push the ON/OFF button on the remote
Lightning or a car wireless telephone operating nearby may cause the unit to

Disconnect the unit with the power and then connect the unit with the power again. Push the ON/OFF button on the remote control to restart operation.

Refrigerant Leakage Detection

With this new technology, the display area will appear “ EC ” and the LED indication lamps continue ﬂashing when the outdoor unit detects refrigerant leakage.

Operating Instructions

HINTS FOR ECONOMICAL OPERATION

The following should be noticed to ensure an economical operation. (Refer to corresponding chapter for details)

Adjust the air ﬂow direction properly to avoid winding toward your body.
Adjust the room temperature properly to get a comfortable situation and to avoid supercooling and
In cooling, close the curtains to avoid direct
To keep cool or warm air in the room, never open doors or windows more often than
Set the timer for the desired operating
Never put obstructions near the air outlet or the air inlet; it will cause lower eﬃciency, even a sudden
If you don’t plan to use the unit for a long time, please disconnect power and remove the batteries from the remote When the power switch is connected, some energy will be consumed, even if the air conditioner isn’t in operation. So please disconnect the power to save energy. And please switch the power on 12 hours before you restart the unit to ensure a smooth operation.
A clogged air ﬁlter will reduce cooling or heating eﬃciency, please clean it once two

Maintenance

CAUTION

Before you clean the air conditioner, be sure the power supply is oﬀ.
Check if the wiring is not broken oﬀ or
Use a dry cloth to wipe the indoor unit and remote
A wet cloth may be used to clean the indoor unit if it is very
Never use a damp cloth on the remote
Do not use a chemically-treated duster for wiping or leave such material on the unit for It coulddamage or fade the surface of the unit.
Do not use benzine, thinner, polishing powder, or similar solvents for These may cause the plastic surface to crack or deform.

Maintenance After A Long Stop Period Cleaning The Air Filter

(eg. at the beginning of the season)

Check and remove anything that might be blocking inlet and outlet vents of indoor units and outdoor
Clean air ﬁlters and casings of indoor units. Refer to “Cleaning the air ﬁlter” for details on how to proceed and make sure to install clean air ﬁlters back in the same
Turn on the power at least 12 hours before operating the unit in order to ensure smoother As soon as he power is turned on, the remote control displays appear. (on some models)
The air ﬁlter can prevent dust or other particulate from going inside the When the ﬁlter gets dirty, the air conditioner eﬃciency decreases.
Therefore, the ﬁlter must be cleaned once every two weeks during long time
If the air conditioner is installed in a dusty place,increase the frequency of air ﬁlter cleaning.
If the accumulated dust is too heavy to be cleaned, please replace the ﬁlter with a new one (replaceable air ﬁlter is optional).
The ﬁlter cleaning should be performed by a suitable service If your Air Handler is a rear ventilated unit, please remove th e ﬁlter ﬁxed scre w （ s ﬁlter away from the unit. and take down the

Maintenance Before A Long Stop Period

(eg. at the end of the season)

Let the indoor units run in fan only operation for about half a day in order to dry the interior of the
Clean air ﬁlters and casings of indoor units. Refer to “Cleaning the air ﬁlter” for details on how to proceed and make sure to install clean air ﬁlters back in the same

Maintenance

Cleaning The Air Filter

Continued. If your Air Handler is a descensional ventilated unit, please push the ﬁlter up slightly to let the position retainer escape away from the ﬂange ﬁxed holes, and take oﬀ the ﬁlter according to the arrow direction shows in the following ﬁg.

Clean the air ﬁlter (a vacuum cleaner or pure water may be used to clean the air ﬁlter. If the dust accumulation is too heavy, use a soft brush and mild detergent to clean it and dry out in cool place)

CAUTION

Do not dry out the air ﬁlter under direct sunshine or with ﬁre.

After cleaning the air ﬁlter, re-install it into the unit. Reinstall and close the air-in grill in the reverse order depending on your speciﬁc air handler. Reconnect the control box cables to the corresponding terminators of the main body .

Troubleshooting

Procedure	Problem

If one of the following malfunctions occur, stop operation, shut oﬀ the power, and contact MRCOOL or your installation dealer.| The operation lamp is flashing rapidly (5Hz). This lamp is still flashing rapidly after turning off the power for 3 minutes and turning it on again.
A safety device such as a fuse or a breaker frequently actuates.
Obstacles and water enter the unit.
Water leaks from indoor unit.
Other malfunctions not covered in the following troubleshooting tables.

CAUTION

Incorrect installation or incorrect voltage could cause above mentioned malfunctions.

Symptoms	Causes	Solution

Unit does not start

| Power failure.

Power switch is oﬀ.

Fuse of power switch may have burned.

Batteries of remote control may be dead or the remote may be malfunctioning.

| Wait for the comeback of power.

Switch on the power.

Replace the fuse.

Replace the batteries or check the controller.

Air ﬂowing normally but can’t

complete cooling

| Temperature is not set correctly.

The 3 minute delay protection feature has been activated..

| Set the temperature properly. Wait.

Units starts or stops frequently

| Refrigerant is too little or too much.

Air or no concreting gas in the refrigerating circuit. Compressor is malfunctioning.

Voltage is too high or too low.

System circuit is blocked.

| Check leakage, and rightly recharge

refrigerant.

Vacuum and recharge refrigerant. Maintenance or change compressor. Install manostat.

Find reasons and solution.

Low cooling eﬀect

| Outdoor unit and indoor unit heat exchanger is dirty.

The air ﬁlter is dirty.

Inlet/outlet of indoor/outdoor units is blocked.

Doors and windows are open Sunlight is directly shining into area. Too much heat resource.

Outdoor temp. is too high.

Leakage of refrigerant or lack of refrigerant.

| Clean the heat exchanger.

Clean the air ﬁlter.

Eliminate all accumulated dust. Close doors and windows.

Make curtains in order to shelter from

sunshine.

Reduce heat source.

AC cooling capacity reduces (normal).

Check leakage and rightly recharge refrigerant.

Low heating eﬀect

| Outdoor temperature is lower than 44°F Doors and Windows not completely closed. Leakage of refrigerant or lack of refrigerant.| Use heating device.

Close doors and windows.

Check leakage and rightly recharge refrigerant.

Troubleshooting

Wire Controller Troubleshooting

Symptoms	Solution	Causes

The fan speed can not be changed.

| Check whether the MODE indicated on the display is “AUTO”| When the automatic mode is selected, the air conditioner will automatically change the fan speed.
Check whether the MODE indicated on the display is “DRY”| When dry operation is selected,

the air conditioner will automatically change the fan speed. The fan speed can be selected during “COOL” , “FAN ONLY”, and “HEAT”

The wire controller signal is not transmitted even when the ON/OFF button is pushed.| Check whether the signal transmitter of the wire controller is properly directed to the infrared signal receiver

of the indoor unit.

| The power supply is off.
The TEMP. indicator does not come on.| Check whether the MODE indicated on the display is FAN ONLY| The temperature cannot be set during FAN mode.
The indication on the display| Check whether the timer| The air conditioner operation will
disappears after a lapse of| operation has come to an| stop up to the set time
time.| end when the TIMER OFF|
| is indicated on the display.|

The TIMER ON indicator goes off after a lapse of certain time.

| Check whether the timer operation is started when the TIMER ON is indicated on the display.| ****

Up to the set time, the

air conditioner will automatically start and the appropriate indicator will go off.

No receiving tone sounds from the indoor unit even when the ON/OFF button is pressed.

| ****

Check whether the signal transmitter of the wire controller is properly directed to the infrared signal receiver of the indoor unit when the ON/OFF button is pressed.

| ****

Directly transmit the signal transmitter of the wire controller to the

infrared signal receiver of the indoor unit, and then repeatedly Push the ON/OFF button twice.

Troubleshooting

Indoor Unit Error Display

NO.| Malfunction| display (nixie tube)| timer lamp| running lamp (flashes per second)
---|---|---|---|---
1| Indoor EEPROM error| E0| OFF| 1
2| Communication malfunction between indoor and outdoor units| E1| OFF| 2
3| Indoor fan speed malfunction| E3| OFF| 4
4| Indoor room temperature sensor open circuit or short circuit| ****

E4

| ****

OFF

| ****

5

5| Evaporator coil temperature sensor open circuit or short circuit| ****

E5

| ****

OFF

| ****

6

6| Refrigerant leakage detection malfunction| ****

EC

| ****

OFF

| ****

7

7| Water-level alarm malfunction| EE| OFF| 8

8

| Communication malfunction between two indoor units (for twins model)| ****

E8

| ****

OFF

| ****

9

9| Other malfunction of twins model| E9| OFF| 10
10| Current overload protection| F0| ON| 1
11| Outdoor room temperature sensor open circuit or short circuit| ****

F1

| ****

ON

| ****

2

12| Outdoor condenser pipe temperature sensor error| ****

F2

| ****

ON

| ****

3

13| Discharging air temperature sensor error| ****

F3

| ****

ON

| ****

4

14| Outdoor EEPROM error| F4| ON| 5
15| Outdoor fan speed malfunction (Only for DC fan motor)| ****

F5

| ****

ON

| ****

6

16| T2b sensor error| F6| ON| 7
17| Inverter module IPM protection| P0| Flash| 1
18| High/Low voltage protection| P1| Flash| 2
19| High temperature protection of compressor top| ****

P2

| ****

Flash

| ****

3

20| Outdoor low temp. protection| P3| Flash| 4
21| Compressor drive error| P4| Flash| 5
22| Mode conflict| P5| Flash| 6

The following situations are not operation

Problem	Time of Occurrence	Cause

Unit doesn’t run.

| When unit is started immediately after it is just turned off.| Overload protection switch causes a 3 minute delay.
When power is turned on.| Start up could be delayed up to 1 minute.
Mist comes from the unit.|

During operation.

| If the unit is running under high humidity, the wet air in the room will be quickly cooled down.

The unit generates noise.

| Slight cracking sound is heard when unit is turned on.| Electronic expansion valve initialization can cause this noise temporarily.
There is a continuous sound when cooling.| Gas refrigerant flow can cause a slight noise.
The unit makes a sound when unit starts or stops.| Gas refrigerant flow can cause a slight noise.
There is slight and continuous sound when unit is running or after running.| The drainage system can cause this noise during operation.
Dust comes from the unit.| When unit runs after no operation for a long period of time.| Dust has settled inside the indoor unit.
The unit emits odor.|

During operation.

| Smells from the operating environment may be pulled through the air handler.

The outdoor unit fan does not spin.

|

During operation.

|

The speed of the fan is controlled in order to optimize product operation.

The unit automatically changes to fan mode.|

During cooling mode or heating mode.

| This prevents indoor evaporator frosting or overheating and will start back up when the temperature changes.

EU Disposal Guidelines

This appliance contains refrigerant and other potentially hazardous materials. When disposing of this appli- ance, the law requires special collection and treatment. DO NOT dispose of this product as household waste or unsorted municipal waste.
When disposing of this appliance, you have the following options:

Dispose of the appliance at a designated municipal electronic waste collection
When buying a new appliance, the retailer will receive the old appliance free of
The manufacturer will receive the old appliance free of charge.
Sell the appliance to certiﬁed scrap metal

Special notice

Disposing of this appliance in the forest or other natural surroundings endangers your health and is bad for the environment. Hazardous substances may leak into the ground water and enter the food chain.