Installation Of New Refrigerant Air Conditioner; Selection Of Installation Place - Toshiba MMD-AP0071SH-C Service Manual

2

INSTALLATION OF NEW REFRIGERANT AIR CONDITIONER

This air conditioner adopts the new HFC refrigerant (R410A) which does not deplete the ozone layer.
• R410A refrigerant is apt to be affected by impurity such as water, oxidizing membrane, or oils because the
pressure of R410A refrigerant is higher than that of the former refrigerant by approx. 1.6 times. Accompanied with
adoption of the new refrigerant, refrigerating oil has been also changed. Therefore pay attention so that water,
dust, former refrigerant, or refrigerating oil does not enter into the refrigerating cycle of the new refrigerant air
conditioner during installation work.
• To prevent from mixing of refrigerant or refrigerating oil, the size of charge port of the main unit or connecting
section of installation tool differs from that of the air conditioner for the former refrigerant. Accordingly the
exclusive tools are required for the new refrigerant (R410A) as shown below.
• For connecting pipes, use the new and clean piping materials so that water or dust does not enter.
Required tools and cautions on handling
It is necessary to prepare the tools and parts as described below for the installation work.
The tools and parts which will be newly prepared in the following items should be restricted to the exclusive use.
Explanation of symbols
l
: Newly prepared (It is necessary to use it properly exclusive to R410A separated from those for R22 or R407C.)
¡ : Former tool is available.
Used tools Usage
Gauge manifold Vacuuming or charging of
refrigerant and operation check
Charging hose
Charging cylinder Charges refrigerant
Gas leak detector Checks gas leak
Vacuum pump Vacuum drying
Vacuum pump with counter- Vacuum drying
flow preventive adapter
Flare tool Flare processing of pipes
Bender Bending processing of pipes
Refrigerant recovery device Recovers refrigerant
Torque wrench Tightens flare nut
Pipe cutter Cuts pipes
Refrigerant cylinder Charges refrigerant
Welding machine/ Welding of pipes
Nitrogen gas cylinder
Refrigerant charging balance Charges refrigerant
Proper use of tools/parts
l
Newly prepared, Exclusive to R410A
l
Newly prepared, Exclusive to R410A
Unusable (Use the Refrigerant charging balance.)
l
Newly prepared
Usable if a counter-flow preventive adapter is attached
¡
: R22 (Existing article)
¡
: Usable by adjusting size
¡
: R22 (Existing article)
l
Exclusive to R410A
l
Ø12.7mm, Exclusive for Ø15.9mm
¡
: R22 (Existing article)
l
Exclusive to R410A
ID : Refrigerant name entered
¡
: R22 (Existing article)
¡
: R22 (Existing article)
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SELECTION OF INSTALLATION PLACE

• Install the air conditioner where there is sufficient strength to weight of the unit.
If strength is insufficient, the unit may fall down resulting in human injury.
• Perform a specified installation work to guard against an earth quake.
An incomplete installation can cause accidents by the units failing and dropping.
• Install the air conditioner at a height 2.5m or more from the floor.
If you insert your hands or others directly into the unit while the air conditioner operates, it is dangerous
because you may contact with revolving fan or active electricity.
• Do not install the air conditioner in a location subject to a risk of exposure to combustible gas.
Should the combustible gas leak and collect near the unit, fire may occur.
Upon approval of the customer, install the air conditioner in a place that satisfies the
following conditions.
• Place where the unit can be installed horizontally.
• Place where a sufficient servicing space can be ensured for safe maintenance and check.
• Place where drained water will not cause any problem.
Avoid installing in the following places.
• Place exposed to air with high salt content (seaside area), or place exposed to large quantities of sulfide gas
(hot spring). (Should the unit be used in these places, special protective measures are needed.)
• Place exposed to oil, vapor, oil smoke or corrosive gas.
• Place where organic solvent is used nearby.
• Place close to a machine generating high frequency.
• Place near door or window where may come to contact with the fresh air of high humidity.
(Dewing may be caused.)
• Place where special spray is frequently used.
• Place with poor ventilation.
Installation under high-humidity atmosphere
In some cases including the rainy season, especially inside of the ceiling may become high-humidity atmosphere
(dew-point temperature: 23°C or higher).
1. Installation to inside of the ceiling with tiles on the roof
2. Installation to inside of the ceiling with slated roof
3. Installation to a place where inside of the ceiling is used for pathway to intake the fresh air
• In the above cases, additionally attach the heat insulator to all positions of the air conditioner, which come to
contact with the high-humidity atmosphere. In this case, arrange the side plate (Check port) so that it is easily
removed.
• Apply also a sufficient heat
[Reference] Dewing test conditions
insulation to the duct and
connecting part of the duct.
WARNING
CAUTION
Indoor side: 27°C dry bulb temperature
24°C wet bulb temperature
Air volume: Low air volume, operation time 4 hours