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Table Of Contents; Safety Precautions; Before Installation And Electric Work; Precautions For Devices That Use R410A Refrigerant - Mitsubishi Electric PAC-AH125 Installation Manual

Air handling unit controller
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Contents
1. Safety precautions ......................................................................................... 6
1.1. Before installation and electric work ............................................. 6
1.3. Before getting installed ................................................................. 7
1.5. Before starting the test run ........................................................... 7
2. Accessories.................................................................................................... 7
3. System component ........................................................................................ 8
4.1. Combining indoor units with outdoor units.................................... 9
4.2. Installing the controller.................................................................. 9
5. Refrigerant pipe specifications ....................................................................... 9
6. Connecting refrigerant pipes .......................................................................... 9
6.1. Refrigerant piping work................................................................. 9

1. Safety precautions

1.1. Before installation and electric work

Before installing the unit, make sure you read all the
"Safety precautions".
The "Safety precautions" provide very important points
regarding safety. Make sure you follow them.
Symbols used in the text
Warning:
Describes precautions that should be observed to prevent danger of injury
or death to the user.
Caution:
Describes precautions that should be observed to prevent damage to the
unit.
Symbols used in the illustrations
: Indicates an action that must be avoided.
: Indicates that important instructions must be followed.
: Indicates a part which must be grounded.
: Indicates that caution should be taken with rotating parts. (This symbol is
displayed on the main unit label.)
: Beware of electric shock (This symbol is displayed on the main unit label.)
Warning:
Carefully read the labels affixed to the main unit.
Warning:
Ask the dealer or an authorized technician to install the controller.
- Improper installation by the user may result in water leakage, electric shock,
or fire.
This appliance is not intended for use by persons (including children)
with reduced physical, sensory or mental capabilities, or lack of experi-
ence and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for
their safety.
- Children should be supervised to ensure that they do not play with the appli-
ance.
Use the specified cables for wiring. Make the connections securely so
that the outside force of the cable is not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
Prepare for typhoons and other strong winds and earthquakes and
install the unit at the specified place.
- Improper installation may cause the unit to topple and result in injury.
Never repair the unit. If the controller must be repaired, consult the
dealer.
- If the unit is repaired improperly, electric shock, or fire may result.
When handling this product, always wear protective equipment.
EG: Gloves, full arm protection namely boiler suit, and safety glasses.
- Improper handling may result in injury.
If refrigerant gas leaks during installation work, ventilate the room.
- If the refrigerant gas comes into contact with a flame, poisonous gases will
be released.
Install the controller according to this Installation Manual.
- If the unit is installed improperly, electric shock, or fire may result.
6
6.2. Liner expansion valve piping work ................................................ 9
6.3. Thermistor setting work ................................................................ 9
7. Electrical wiring ............................................................................................ 10
7.1. Power supply wiring .................................................................... 11
transmission cables .................................................................... 11
7.3. Connecting LEV-kit and thermistor cables .................................. 11
7.4. Connecting distant signal line ..................................................... 11
7.5. External I/O specifications .......................................................... 12
8. Setting switches ........................................................................................... 12
8.1. Setting addresses ....................................................................... 12
8.2. Setting unit capacity.................................................................... 12
8.3. Setting temperature control ........................................................ 13
8.4. Dip-switch function...................................................................... 13
9. Initial setting and test run ............................................................................. 13
Have all electric work done by a licensed electrician according to "Elec-
tric Facility Engineering Standard" and "Interior Wire Regulations" and
the instructions given in this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is performed
improperly, electric shock and fire may result.
Keep the electric parts away from water (washing water etc.).
- It might result in electric shock, catching fire or smoke.
Securely install the outdoor unit terminal cover (panel).
- If the terminal cover (panel) is not installed properly, dust or water may enter
the outdoor unit and fire or electric shock may result.
When installing and moving the air handling unit to another site, do not
charge the unit with a refrigerant different from the refrigerant specified
on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrig-
erant cycle may malfunction and the unit may be damaged.
If the air handling unit is installed in a small room, measures must be
taken to prevent the refrigerant concentration from exceeding the safety
limit even if the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the
safety limit from being exceeded. Should the refrigerant leak and cause the
safety limit to be exceeded, hazards due to lack of oxygen in the room could
result.
When moving and reinstalling the air handling unit, consult the dealer
or an authorized technician.
- If the controller is installed improperly, electric shock, or fire may result.
After completing installation work, make sure that refrigerant gas is not
leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or
other heat source, it may generate noxious gases.
Do not reconstruct or change the settings of the protection devices.
- If the pressure switch, thermal switch, or other protection device is shorted
and operated forcibly, or parts other than those specified by Mitsubishi Elec-
tric are used, fire or explosion may result.
To dispose of this product, consult your dealer.
Do not use a leak detection additive.
1.2. Precautions for devices that use
R410A refrigerant
Caution:
Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping contains a large
amount of chlorine which may cause the refrigerator oil of the new unit to
deteriorate.
Use refrigerant piping made of C1220 (Cu-DHP) phosphorus deoxidized
copper as specified in the JIS H3300 "Copper and copper alloy seam-
less pipes and tubes". In addition, be sure that the inner and outer sur-
faces of the pipes are clean and free of hazardous sulphur, oxides, dust/
dirt, shaving particles, oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause the refriger-
ant residual oil to deteriorate.
Store the piping to be used during installation indoors and keep both
ends of the piping sealed until just before brazing. (Store elbows and
other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and
compressor trouble may result.
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigera-
tor oil to coat flares and flange connections.
- The refrigerator oil will degrade if it is mixed with a large amount of mineral
oil.
Use liquid refrigerant to fill the system.
- If gas refrigerant is used to seal the system, the composition of the refriger-
ant in the cylinder will change and performance may drop.

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