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1. Safety precautions
1.3. Before electric work
Caution:
• Be sure to install circuit breakers. If not installed, electric shock may result.
• For the power lines, use standard cables of sufficient capacity. Otherwise, a
short circuit, overheating, or fire may result.
• When installing the power lines, do not apply tension to the cables. If the
connections are loosened, the cables can snap or break and overheating or
fire may result.
1.4. Before starting the test run
Caution:
• Turn on the main power switch more than 12 hours before starting operation.
Starting operation just after turning on the power switch can severely dam-
age the internal parts. Keep the main power switch turned on during the op-
eration season.
• Before starting operation, check that all panels, guards and other protective parts
are correctly installed. Rotating, hot, or high voltage parts can cause injuries.
• Be sure to ground the unit. Do not connect the ground wire to gas or water
pipes, lighting rods, or telephone grounding lines. If the unit is not properly
grounded, electric shock may result.
• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse), and
molded case circuit breaker) with the specified capacity. If the circuit breaker
capacity is larger than the specified capacity, breakdown or fire may result.
• Do not touch any switch with wet hands. Electric shock may result.
• Do not touch the refrigerant pipes with bare hands during operation. The
refrigerant pipes are hot or cold depending on the condition of the flowing
refrigerant. If you touch the pipes, burns or frostbite may result.
• After stopping operation, be sure to wait at least five minutes before turning
off the main power switch. Otherwise, water leakage or breakdown may result.
1.5. Using R410A refrigerant air conditioners
Caution:
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Make sure the insides of the pipes are clean
and do not contain any harmful contaminants such as sulfuric compounds,
oxidants, debris, or dust. Use pipes with the specified thickness. (Refer to page
5) Note the following if reusing existing pipes that carried R22 refrigerant.
- Replace the existing flare nuts and flare the flared sections again.
- Do not use thin pipes. (Refer to page 5)
• Store the pipes to be used during installation indoors and keep both ends of
the pipes sealed until just before brazing. (Leave elbow joints, etc. in their
packaging.) If dust, debris, or moisture enters the refrigerant lines, oil dete-
rioration or compressor breakdown may result.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration oil
applied to the flared sections. If mineral oil is mixed in the refrigeration oil, oil
deterioration may result.
• Do not use refrigerant other than R410A refrigerant. If another refrigerant is
used, the chlorine will cause the oil to deteriorate.
• Use the following tools specifically designed for use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant. Contact your
nearest dealer for any questions.
Tools (for R410A)
Gauge manifold Flare tool
Charge hose Size adjustment gauge
Gas leak detector Vacuum pump adapter
Torque wrench Electronic refrigerant charging scale
• Be sure to use the correct tools. If dust, debris, or moisture enters the refrig-
erant lines, refrigeration oil deterioration may result.
• Do not use a charging cylinder. If a charging cylinder is used, the composi-
tion of the refrigerant will change and the efficiency will be lowered.
2. Installation location
2.1. Refrigerant pipe
Refer to Fig. 4-1.
2.2. Choosing the outdoor unit installation location
• Avoid locations exposed to sources of heat.
• Select a location from which noise emitted by the unit will not inconvenience neighbors.
• Select a location permitting easy wiring and pipe access to the power source and
indoor unit.
• Avoid locations where combustible gases may leak, be produced, flow, or accumulate.
• Note that water may drain from the unit during operation.
• Select a level location that can bear the weight and vibration of the unit.
• Avoid locations where the unit can be covered by snow. In areas where heavy snow fall
is anticipated, special precautions such as raising the installation location or installing a
hood on the air intake must be taken to prevent the snow from blocking the air intake or
blowing directly against it. This can reduce the airflow and a malfunction may result.
• Avoid locations exposed to oil, steam, or sulfuric gas.
• Use the transportation handles of the outdoor unit to transport the unit. If the unit is
carried from the bottom, hands or fingers may be pinched.
2.3. Outline dimensions (Outdoor unit) (Fig. 2-1)
Constraints on indoor unit installation
You should note that indoor units that can be connected to this outdoor unit are the
following models.
• Indoor units with model numbers P06-P54 (PUMY-P36 : P06-P36) can be con-
nected. Refer to the table below for possible 1-8 (PUMY-P36 : 1-6) room, indoor unit
combinations.
Verification
The rated capacity should be determined by observing the table below. The unit’s
quantities are limited in 1 to 8 units. For the next step, make sure that the total rated
capacity selected will stay in a range of 50% - 130% of the outdoor unit capacity.
• PUMY-P36 18,000 - 46,800 Btu/h
• PUMY-P48 24,000 - 62,400 Btu/h
Indoor unit type P06 P08 P12 P15 P18 P24 P30 P36 P48 P54
Rated capacity
6,000 8,000 12,000 15,000 18,000 24,000 30,000 36,000 48,000 54,000
(Cooling) (Btu/h)
Combinations in which the total capacity of indoor units exceeds the capacity of the
outdoor unit will reduce the cooling capacity of each indoor unit below their rated
cooling capacity. Thus, combine indoor units with an outdoor unit within the outdoor
unit’s capacity, if possible.
(inch)
1.6. Precautions for salt damage–resistant model
(“-BS” model)
Although this product (only “-BS” model) has been designed to be resistant to salt
damage, observe the following precautions to maintain the performance of the unit.
1.Avoid installing the unit in a location where it will be exposed directly to seawater or
sea breeze.
2.If the cover panel may become covered with salt, be sure to install the unit in a
location where the salt will be washed away by rainwater. (If a sunshade is in-
stalled, it may be difficult for rainwater to clean the panel.)
Fig. 2-1
3.To ensure that water does not collect in the base of the outdoor unit, make sure that
the base is level, not at angle. Water collecting in the base of the outdoor unit could
cause rust.
4.If the unit is installed in a coastal area, clean the unit with water regularly to remove
any salt build-up.
5.If the unit is damaged during installation or maintenance, be sure to repair it.
6.Be sure to check the condition of the unit regularly.
7.Be sure to install the unit in a location with good drainage.