Mitsubishi Heavy Industries TC-PSA-25W-E, Technical Manual

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 22 

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 '12 • SRK-T

-126

'09•SRK-DB-087D

• We recommend you to read this “SAFETY PRECAUTIONS” carefully before the installation work in order to 

gain full advantage of the functions of the unit and to avoid malfunction due to mishandling.

• The precautions described below are divided into                         and                        . The matters with 

possibilities leading to serious consequences such as death or serious personal injury due to erroneous handling 
are listed in the                         and the matters with possibilities leading to personal injury or damage of the 
unit due to erroneous handling including probability leading to serious consequences in some cases are listed 
in                       . These are very important precautions for safety. Be sure to observe all of them without fail.

• Be sure to confirm no anomaly on the equipment by commissioning after completed installation and explain the 

operating methods as well as the maintenance methods of this equipment to the user according to the owner’s 
manual.

• Keep the installation manual together with owner’s manual at a place where any user can read at any time. 

Moreover if necessary, ask to hand them to a new user.

• For installing qualified personnel, take precautions in respect to themselves by using suitable protective 

clothing, groves, etc., and then perform the installation works.

• Please pay attention not to fall down the tools, etc. when installing the unit at the high position.
• If unusual noise can be heard during operation, consult the dealer.
• Symbols which appear frequently in the text have the following meaning:

RWC012A030A

Models 25·35

• This installation manual deals with outdoor units and general installation specifications only.  For indoor units, refer to page 16
• When install the unit, be sure to check whether the selection of installation place, power supply specifications, usage limitation (piping length, height differences between indoor and outdoor units, power 

supply voltage and etc.) and installation spaces. 

SAFETY PRECAUTIONS

WARNING

Strictly prohibited

Observe instructions
with great care

Provide proper earthing

CAUTION

WARNING

CAUTION

WARNING

• Carry out the electrical work for ground lead with care.

  Do not connect the ground lead to the gas line, water line, lightning conductor or telephone line’s ground lead. Incorrect grounding can cause unit faults such as electric shocks due to short-circuiting.

• Installation must be carried out by the qualified installer.

  If you install the system by yourself, it may cause serious trouble such 

as water leaks, electric shocks, fire and personal injury, as a result of a 

system malfunction.

• Install the system in full accordance with the instruction 

manual.

  Incorrect installation may cause bursts, personal injury, water leaks, 

electric shocks and fire.

• Be sure to use only for household and residence. 

  If this appliance is installed in inferior environment such as machine 

shop and etc., it can cause malfunction. 

• Use the original accessories and the specified components for 

installation.

  If parts other than those prescribed by us are used, It may cause 

water leaks, electric shocks, fire and personal injury.

• Install the unit in a location with good support.

  Unsuitable installation locations can cause the unit to fall and cause 

material damage and personal injury.

• Ensure the unit is stable when installed, so that it can 

withstand earthquakes and strong winds.

  Unsuitable installation locations can cause the unit to fall and cause 

material damage and personal injury.

• Ventilate the working area well in the event of refrigerant 

leakage during installation.

  If the refrigerant comes into contact with naked flames, poisonous gas 

is produced.

• Use the prescribed pipes, flare nuts and tools for R410A.

  Using existing parts (for R22 or R407C) can cause the unit failure and 

serious accidents due to burst of the refrigerant circuit.

• Tighten the flare nut by torque wrench with specified method.

  If the flare nut were tightened with excess torque, this may cause 

burst and refrigerant leakage after a long period.

• Do not open the operation valves for liquid line and gas line 

until completed refrigerant piping work, air tightness test and 

evacuation.

  If the compressor is operated in state of opening operation valves 

before completed connection of refrigerant piping work, air can be 

sucked into refrigerant circuit, which can cause bust or personal injury 

due to anomalously high pressure in the refrigerant.

• The electrical installation must be carried out by the qualified 

electrician in accordance with “the norm for electrical work” 

and “national wiring regulation”, and the system must be 

connected to the dedicated circuit.

  Power supply with insufficient capacity and incorrect function done by 

improper work can cause electric shocks and fire.

• Be sure to shut off the power before starting electrical work.

  Failure to shut off the power can cause electric shocks, unit failure or 

incorrect function of equipment.

• Be sure to use the cables conformed to safety standard and 

cable ampacity for power distribution work. 

  Unconformable cables can cause electric leak, anomalous heat 

production or fire.

• This appliance must be connected to main power supply by 

means of a circuit breaker or switch (fuse:16A) with a contact 

separation of at least 3mm. 

• Use the prescribed cables for electrical connection, tighten the 

cables securely in terminal block and relieve the cables 

correctly to prevent overloading the terminal blocks.

  Loose connections or cable mountings can cause anomalous heat 

production or fire.

• Arrange the wiring in the control box so that it cannot be 

pushed up further into the box. Install the service panel 

correctly.

  Incorrect installation may result in overheating and fire.

• Be sure to fix up the service panels.

  Incorrect fixing can cause electric shocks or fire due to intrusion of 

dust or water.

• Be sure to switch off the power supply in the event of 

installation, inspection or servicing.

  If the power supply is not shut off, there is a risk of electric shocks, 

unit failure or personal injury due to the unexpected start of fan.

• Stop the compressor before disconnecting refrigerant pipes in 

case of pump down operation.

  If disconnecting refrigerant pipes in state of opening operation valves 

before compressor stopping, air can be sucked, which can cause 

burst or personal injury due to anomalously high pressure in the 

refrigerant circuit

• Only use prescribed optional parts. The installation must be 

carried out by the qualified installer.

  If you install the system by yourself, it can cause serious trouble such 

as water leaks, electric shocks, fire.

• Ensure that no air enters in the refrigerant circuit when the unit 

is installed and removed.

  If air enters in the refrigerant circuit, the pressure in the refrigerant 

circuit becomes too high, which can cause burst and personal injury.

• Do not processing, splice the power cord, or share a socket 

with other power plugs.

  This may cause fire or electric shock due to defecting contact, 

defecting insulation and over-current etc.

• Do not bundling, winding or processing for the power cord. Or, 

do not deforming the power plug due to tread it.

  This may cause fire or heating.

• Do not run the unit with removed panels or protections.

  Touching rotating equipments, hot surfaces or high voltage parts can 

cause personal injury due to entrapment, burn or electric shocks.

• Do not perform any change of protective device itself or its 

setup condition.

  The forced operation by short-circuiting protective device of pressure 

switch and temperature controller or the use of non specified 

component can cause fire or burst.

R410A REFRIGERANT USED

D

     8.2  Installation of outdoor unit

                  Models SRC25ZJX-S, 35ZJX-S