Midea PTAC Series User manual

SERVICE MANUAL
PTAC SERIES
7,000-15,000 BTU/H

CONTENTS
1. Precaution
1.1 Safety Precaution
1.2 Warning
2. Functions and control panel.
3. Dimension
4. Refrigerant Cycle Diagram
5. Electronic function
5.1 Terms and definitions
5.2 Electric Control working environment
5.3 Protection function
5.4 Operation of fan motor
5.5 Operation of compressor
5.6 Dip switches and Jumper selection
5.7 Functions for Front desk switch panel and Wire Controller
6. Unit components
7. Installation details
7.1 How to install the unit
7.2 Care and cleaning
8 Operation characteristics
8.1 Cooling operation
8.2 Heating operation
9 Power connection options
10 Troubleshooting
P1-4
P1
P1-4
P5-7
P8
P9
P10-16
P10
P10
P10
P10-12
P12
P13-14
P15
P16
P17-20
P17-19
P19-20
P21
P21
P21
P21
P22-23
P24-29

1. Precaution
1.1 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 unit, be sure to read this service manual at first.
1.2 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 cab
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.
● For installation, always contact the dealer or an Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
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● Do not install the product on a defective installation stand.
It may cause injury, accident, or damage to the product.
● 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.
Moisture may condense and wet or damage furniture.
● 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.
There is risk of fire or electric shock.
● 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 electric 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 tightlyclosed 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.
Do not use the telephone or turn switches on or off. There is risk of explosion or fire.
● If strange sounds, or small 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.
There is risk of property damage, failure of product, or electric shock.
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● 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 (flooded or submerged), 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.
To avoid vibration of water leakage.
● Do not install the product where thenoise 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.
Avoid personal injury.
● Do not install the product where it will be exposed to sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause
product malfunction or inefficient operation.
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OPERATIONAL
● Do not expose the skin directly to cool air for long periods of time.
(Do not sit in the draft).
This could harm to your health.
● 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.
It may cause product failure.
● 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.
There is risk of personal injury.
● 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 object through air inlet or outlet while the product is operated.
There are sharp and moving parts that could cause personal injury.
● Do not drink the water drained from the product.
It is not sanitary could cause serious healthissues.
● 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.
The chemical in batteries could cause burns or other health hazards.
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2. Functions and control panel.
The controls featured in this manual are representative of many available models. Your model
may offer slightly different features.
· POWER
- Press the POWER button to turn the unit on or off.
When the unit is on,the power indicator light will be green.When the unit is off,the light will go out.
· MODE
- Push this button to cycle through the modes from COOL-HEAT-FAN-COOL.The green indicator light beside the "MODE"
option will illuminate, identifying the mode selected.
- COOL:The range of set temperature is 17 ℃ /62 ℉ ~30 ℃ /86 ℉ .Cooling begins automatically when the room temperature is
above the set point,and stops when the room temperature is 2 ℃ (4 ℉ ) below the set point.But the compressor will run 5
minutes at least in COOL mode before stoping. The fan runs in continuous mode.
- HEAT:The range of set temperature is 17 ℃ /62 ℉ ~29 ℃ /84 ℉ .For heat pump models,the unit can alternate to run between in
reverse cycle heat mode and electric heater mode according to the difference between the setting temperature and the room
temperature.The fan motor cycles on and off with the compressor and electric heater.
NOTE: The reverse cycle and electric heater can not be run at the same time. In following cases, it is normal that the reverse
cycle does not operate.
1.When the outdoor temperatrue is lower than 4 ℃ /40 ℉ or the room temperature falls to 4.5 ℃ /8 ℉ below the set point
temperature.
2.There is a 3-minute minimum compressor run time at any setting to prevent short cycling. The indoor fan motors starts before
the compressor and stops after the compressor cycles off.
3.When frost builds up to the evaporator coils, the unit will defrost automatically and the compressor will cycle off.
- FAN:Fan operation only without heating and cooling.
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UP/DOWN BUTTONS ( ▲ / ▼ )
- Push the UP (or DOWN) button to increase (or decrease) the set temperature of the unit in cooling
or heating mode.The temperature can be set by increments of 1 ℃ (1 ℉ ).The setting temperature
appears in the display.
NOTE:Press and hold ▲ and ▼ buttons together for 3 seconds will alternate the temperature display between ℃
& ℉ scale.
FAN (FAN SPEED)
- Every time you push this button, the fan speed cycles through the settings as follows: HIGH-MED- LOW-HIGH.
DISPLAYS:
- Shows the set temperature in ℃ or ℉ . While on Fan only mode, it shows the room temperature.
Control code:
LC-Pads on the control panel is not available. The unit can be set by using wire controller only.
Note: When receiving the wired remote control signal display LC. Or when wired remote control signal is not
received within the panel key operation for 5 seconds to display LC
FC- Front desk control
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Turn the switch to off
You can connect the front desk
switch for two ways.

Error codes:
AS- Open or short circuit of room temperature sensor (T1);
ES- Open or short circuit of evaporator temperature sensor( T2 );
CS-Open or short circuit of condenser temperature sensor (T3);
oS-Open or short circuit of outside temperature sensor(T4);
HS- Open or short circuit of exhaust temperature sensor( T5 or T6);
Other codes:
LO-Room temperature is lower than 0 ℃ /32 ℉ ;
HI-Room temperature is higher than 37 ℃ /99 ℉
E4- Communication malfunction between main control board and display board
LE- Drive-by-wire controller failure
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3. Dimension
Top View D
W
H
Front View
Dimension :
Dimension 1
（no sleeve,rear grille,and rear net)
Dimension 2
（no rear grille and rear net, but include sleeve)
Dimension 3
（include sleeve and rear net)
Dimension 4
（include sleeve, rear net and rear grille)
WxHxD（mm)
WxHxD（inch)
1067x406x532
42.0x15.9x20.9
1067x408x578
42.0x16.0x22.8
1067x408x588
42.0x16.0x23.1
1067x408x606
42.0x16.0x23.9
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