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© Panasonic Corporation 2015 

Order No: PAPAMY1505100CE 

Air Conditioner 

Outdoor Unit

CU-3E19RBU
CU-4E24RBU

Destination

U.S.A.

Canada

Please file and use this manual together with the service manual for Model No. CS-E9RKUAW CS-E12RKUAW CS-E18RKUAW, 
CS-E24RKUAW, CS-ME7RKUA, CS-E12RB4UW, CS-E18RB4UW, CS-ME5RKUA, Order No. PAPAMY1501049CE, 
PAPAMY1503094CE, PAPAMY1503095CE, PAPAMY1505112CE. 

IMPORTANT SAFETY NOTICE

There are special components used in this equipment which are important for safety. These parts are marked by

in the Schematic

Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced
with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of
manufacturer.

!

WARNING 

This service information is designed for experienced repair technicians only and is not designed for use by the general public. 
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. 
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to 
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death. 

PRECAUTION OF LOW TEMPERATURE 

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

 

Installation Manual

Summary of Contents for CU-3E19RBU

Page 1: ...placed with manufacturer s specified parts to prevent shock fire or other hazards Do not modify the original design without permission of manufacturer WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to...

Page 2: ...S YES YES YES YES YES YES YES YES YES YES NO YES YES CS MKS9NKU CS MKS12NKU CS MKS18NKU CS MKS24NKU Wall Mounted Type CU 3KS19NBU CU 4KS24NBU CU 4KS31NBU Multi Outdoor Unit Indoor Unit 3 Room 4 Room 4 Room CS MKS9NB4U CZ 18BT1U YES YES YES YES YES YES YES YES YES CS MKS12NB4U CZ 18BT1U CS KS18NB4UW CZ 18BT1U Semi Concealed Type 6 ...

Page 3: ... connecting tube kit CZ 3F type Unit A Maximum pipe length 25 m 82 0 ft Unit B Maximum pipe length 25 m 82 0 ft Unit C Maximum pipe length 25 m 82 0 ft Indoor outdoor unit connection cables Flexible cord x 4 core polychloroprene sheathed Not included in the unit Outdoor unit power supply Single phase 208 230V 60Hz 30A switch circuit breaker Not included in the unit Flexible cord x 3 core Not inclu...

Page 4: ...ximum pipe length 25 m 82 0 ft Unit B Maximum pipe length 25 m 82 0 ft Unit C Maximum pipe length 25 m 82 0 ft Unit D Maximum pipe length 25 m 82 0 ft Indoor outdoor unit connection cables Flexible cord x 4 core polychloroprene sheathed Not included in the unit Flexible cord x 4 core polychloroprene sheathed Outdoor unit power supply Single phase 208 230V 60Hz 45A switch circuit breaker Not includ...

Page 5: ...h Outdoor Unit CU 3E19 Allowable piping length of each indoor unit min max 9 8 ft 82 0 ft 3 m 25 m Allowable total piping length of all indoor unit 164 0 ft 50 m or less Height difference between indoor and outdoor unit Outdoor unit located on upper side g 49 2 ft 15 m or less Outdoor unit located otherwise h 24 6 ft 7 5 m or less Outdoor unit located otherwise k 49 2 ft 15 m or less Height differ...

Page 6: ... the copper pipe Align center of piping to valves and then tighten with torque wrench to the specified torque as stated in the table Do not over tighten over tightening may cause gas leakage Piping size Torque 1 4 6 35 mm 13 3 Ibf ft 18 N m 1 8 kgf m 3 8 9 52 mm 31 0 Ibf ft 42 N m 4 3 kgf m 1 2 12 7 mm 40 6 Ibf ft 55 N m 5 6 kgf m 5 8 15 88 mm 47 9 Ibf ft 65 N m 6 6 kgf m 3 4 19 05 mm 73 8 Ibf ft ...

Page 7: ...3 3 Ibf ft 18 N m with a torque wrench 7 Remove the valve caps of both of the 2 way valve and 3 way valve Position both of the valves to Open using a hexagonal wrench 5 32 4 mm 8 Mount valve caps onto the 2 way valve and 3 way valve o Be sure to check for gas leakage If micron gauge value does not descend 500 microns take the following measures If the leak stops when the piping connections are tig...

Page 8: ...nit A Unit C Terminal Terminal Indoor Unit B Indoor Unit A Disconnect Switch Field supply Grounding wire Grounding wire min AWG16 Grounding wire min AWG16 Grounding wire min AWG16 Power Supply Single Phase 208 230V 60Hz min AWG12 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16...

Page 9: ...aterial shall withstand 248 F 120 C or higher Gas side pipes 10 1 7 Disposal Of Outdoor Unit Drain Water If a drain elbow is used the unit should be placed on a stand which is taller than 1 31 32 50 mm If the unit is used in an area where temperature falls below 32 F 0 C for 2 or 3 days in succession it is recommended not to use a drain elbow for the drain water freezes and the fan will not rotate...

Page 10: ...tdoor Unit Installation Diagram Allowable piping length Outdoor Unit CU 4E24 Allowable piping length of each indoor unit min max 9 8 ft 82 0 ft 3 m 25 m Allowable total piping length of all indoor unit 229 6 ft 70 m or less Height difference between indoor and outdoor unit Outdoor unit located on upper side g 49 2 ft 15 m or less Outdoor unit located otherwise h 24 6 ft 7 5 m or less Outdoor unit ...

Page 11: ...wrench to the specified torque as stated in the table Do not over tighten over tightening may cause gas leakage Piping size Torque 1 4 6 35 mm 13 3 Ibf ft 18 N m 1 8 kgf m 3 8 9 52 mm 31 0 Ibf ft 42 N m 4 3 kgf m 1 2 12 7 mm 40 6 Ibf ft 55 N m 5 6 kgf m 5 8 15 88 mm 47 9 Ibf ft 65 N m 6 6 kgf m 3 4 19 05 mm 73 8 Ibf ft 100 N m 10 2 kgf m Gas Leak Checking Pressure test to system to 400 PSIG with d...

Page 12: ...of 13 3 Ibf ft 18 N m with a torque wrench 7 Remove the valve caps of both the 2 way valve and 3 way valve Position both of the valves to Open using a hexagonal wrench 5 32 4 mm 8 Mount valve caps onto the 2 way valve and 3 way valve o Be sure to check for gas leakage If micron gauge value does not descend 500 microns take the following measures If the leak stops when the piping connections are ti...

Page 13: ...ng wire Power Supply Single Phase 208 230V 60Hz min AWG12 Grounding wire min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 Grounding wire min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 Grounding wire min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 Grounding wire min AWG16 208 230V min AWG16 208 230V min AWG16 208 230V min AWG16 Indoor Unit B ...

Page 14: ...aterial shall withstand 248 F 120 C or higher Gas side pipes 10 2 7 Disposal Of Outdoor Unit Drain Water If a drain elbow is used the unit should be placed on a stand which is taller than 1 31 32 50 mm If the unit is used in an area where temperature falls below 32 F 0 C for 2 or 3 days in succession it is recommended not to use a drain elbow for the drain water freezes and the fan will not rotate...

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