Specifications

WR2-SERIES SYSTEM DESIGN (June 2010)
WR2SD-7
WR2-SERIES
SYSTEM DESIGN
1. ELECTRICAL WORK
1-3. Power Cable Specications
1. Use dedicated power supplies for the heat source unit and indoor unit. Ensure OC and OS are wired individually.
2. Bear in mind ambient conditions (ambient temperature,direct sunlight, rain water,etc.) when proceeding with the wiring and
connections.
3. The wire size is the minimum value for metal conduit wiring. If the voltage drops, use a wire that is one rank thicker in diameter.
Make sure the power-supply voltage does not drop more than 10%.
4.Specicwiringrequirementsshouldadheretothewiringregulationsoftheregion.    
5.Powersupplycordsofpartsofappliancesforheatsourceuseshallnotbelighterthanpolychloroprenesheathedexiblecord
(design 245 IEC57). For example, use wiring such as YZW.
6. A switch with at least 3 mm [1/8 in.] contact separation in each pole shall be provided by the Air Conditioner installer.
• Besuretousespeciedwiresforconnectionsandensurenoexternalforceisimpartedtoterminalconnections.Ifconnectionsare
notxedrmly,heatingorremayresult.        
• Be sure to use the appropriate type of overcurrent protection switch. Note that generated overcurrent may include some amount of
direct current.
• Someinstallationsitesmayrequireattachmentofanearthleakagebreakerfortheinverter.Ifnoearthleakagebreakerisin-
stalled, there is a danger of electric shock.
• Do not use anything other than a breaker and fuse with the correct capacity. Using a fuse or wire of too large capacity may cause
malfunctionorre.        
Thickness of wire for main power supply, capacities of the switch and system impedance
Model
Minimum wire thickness (mm
2
/AWG)
Breaker for current leakage
Switch (A)
Breaker for
wiring (NFB)
Main cable Branch Ground Capacity Fuse
Water-source
unit
PQRY-P72THMU-A 3.3/12 - 3.3/12 20A 30mA or 100mA 0.1sec. or less 20 25 20
PQRY-P96THMU-A 5.3/10 - 5.3/10 30A 30mA or 100mA 0.1sec. or less 30 40 30
PQRY-P120THMU-A 8.4/8 - 8.4/8 40A 100mA 0.1sec. or less 40 50 40
Indoor unit 0.41/22 0.41/22 0.41/22 15A 30mA or 100mA 0.1sec. or less 15 15 15
Model
Minimum wire thickness (mm
2
/AWG)
Breaker for current leakage
Switch (A)
Breaker for
wiring (NFB)
Main cable Branch Ground Capacity Fuse
Water-source
unit
PQRY-P72YHMU-A 2.1/14 - 2.1/14 15A 30mA or 100mA 0.1sec. or less 15 15 15
PQRY-P96YHMU-A 2.1/14 - 2.1/14 15A 30mA or 100mA 0.1sec. or less 15 15 15
PQRY-P120YHMU-A 3.3/12 - 3.3/12 20A 30mA or 100mA 0.1sec. or less 20 20 20
Indoor unit 0.41/22 0.41/22 0.41/22 15A 30mA or 100mA 0.1sec. or less 15 15 15