En-4
2.4. Optional parts
Parts name
Model name
External connect kit
(for External input/output)
UTY-XWZXZ3
2.5. Operating range
Outdoor
Cooling/Dry Mode
Heating Mode
Temperature
-5 to 115°F
(-20 to 46°C)
-15 to 75°F
(-26 to 24°C)
3. GENERAL SPECIFICATION
3.1. Selecting circuit breaker and wiring
CAUTION
Be sure to install a breaker of the specified capacity.
Regulation of cables and breaker differs from each locality, refer in accordance with
local rules.
Voltage rating
1 ø 208/230 V (60 Hz)
Operating range
188-253 V
Cable
Description
Power supply cable
2 cable + Earth (Ground), 1 ø 208/230 V
Connection cable
3 cable + Earth (Ground), 1 ø 208/230 V
Select the correct cable type and size according to the country or region’s regulations.
Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the wire
diameter when the wire length is long.
CAUTION
MINIMUM CIRCUIT AMPACITY
25.6 A
MAX. CKT. BKR.
30 A
•
Before starting work check that power is not being supplied to all poles of the indoor
unit and outdoor unit.
•
Install all electrical works in accordance to the national standard.
•
Install the disconnect device with a contact gap of at least 2/16 in. (3mm) in all poles
nearby the units. (Both indoor unit and outdoor unit)
•
Install the circuit breaker nearby the units.
3.2. Selecting the pipe material
CAUTION
Do not use existing pipes.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material: Phosphor deoxidized seamless copper pipes.
It is desirable that the amount of residual oil is less than 40 mg/33ft (10m).
Do not use copper pipes that have a collapsed, deformed, or discolored portion
(especially on the interior surface). Otherwise, the expansion valve or capillary tube may
become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional refrigerant, it is necessary to
choose adequate materials.
Note:
Thicknesses of copper pipes used with R410A are as shown in the table.
Never use copper pipes thinner than those indicated in the table even if they are available
on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in. (mm)]
Thickness [in. (mm)]
1/4 (6.35)
0.032 (0.80)
3/8 (9.52)
0.032 (0.80)
1/2 (12.70)
0.032 (0.80)
5/8 (15.88)
0.039 (1.00)
3/4 (19.05)
0.047 (1.20)
3.3. Protection of pipes
Protect the pipes to prevent the entry of moisture and dust.
Especially, pay attention when passing the pipes through a hole or connecting the end of
a pipe to the outdoor unit.
Location
Working period
Protection method
Outdoor
1 month or more
Pinch pipes
Less than 1 month
Pinch or tape pipes
Indoor
-
Pinch or tape pipes
3.4. Refrigerant pipe size and allowable piping length
CAUTION
Keep the piping length between the indoor unit and outdoor unit within the allowable
tolerance.
Pipe diameter <Liquid/Gas>
(Standard)
[in. (mm)]
3/8 (9.52) / 5/8 (15.88)
Max. piping length (L1)
246 ft. (75 m)
Min. piping length (L1)
16 ft. (5 m)
Max. height difference (H1)
<Indoor unit to outdoor unit>
98 ft. (30 m)
View (Example)
L1
H1
Indoor unit
*1: For the standard pipe diameter.
3.5. For Pre-charge lengths
3.5.1. For Pre-charge lengths
Piping length (L) *Pre-charge
66ft. ( 20m )
3.6. If additional refrigerant is required
3.6.1. If additional refrigerant is required
•
When the piping is longer than pre-charge length, additional charging is necessary.
•
For the additional amount, see the table below.
Additional charging amount
Single type
L1 > Pre-charge length
Piping length
66ft
(20m)
99ft
(30m)
131ft
(40m)
165ft
(50m)
196ft
(60m)
229ft
(70m)
246ft
(75m)
Rate
Additional
charge
None
14.2oz
(400g)
1lb 12oz
(800g)
2lb 10oz
(1200g)
3lb 8oz
(1600g)
4lb 7oz
(2000g)
4lb 14oz
(2200g)
0.43oz/ft
(40g/m)
4. INSTALLATION WORK
Make sure to obtain the customer’s approval for selecting and installing the outdoor unit.
4.1. Selecting an installation location
WARNING
Securely install the outdoor unit at a location that can withstand the weight of the unit.
Otherwise, the outdoor unit may fall and cause injury.
Be sure to install the outdoor unit as prescribed, so that it can withstand earthquakes
and typhoons or other strong winds. Improper installation can cause the unit to topple or
fall, or other accidents.
Do not install the outdoor unit near the edge of a balcony. Otherwise, children may climb
onto the outdoor unit and fall off of the balcony.
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