Hitachi HSU-12RD03/R2(SDB) - Manual (Page 8)

Outdoor unit
1.Installation of Outdoor Unit
3.Connection
4.Attaching Drain-Elbow
2.Connection of pipes
Install according to
To bend a pipe, give the roundness as large as possible not to crush the pipe ,and the bending radius
should be 30 to 40 mm or longer.
Connecting the pipe of gas side first makes working easier.
The connection pipe is specialized for R410A.
Use the same method on indoor unit. Loosen the screws on terminal block and insert the plugs fully into
terminal block, then tighten the screws.
If wiring is not correct, proper operation can not be carried out and controller may be damaged.
If the drain-elbow is used, please attach it as
figure. (Note: Only for heat pump unit.)
Drawing for the installation of indoor and outdoor units
Insert the cable according to terminal number in the same manner as the indoor unit.
Fix the cable with a clamp.
Half union Flare nut
Spanner
Torque wrench
Forced fastening without careful
centering may damage the
threads and cause a leakage of
gas.
Pipe Diameter Fastening torque
Liquid side 6.35mm(1/4") 18N.m
Gas side 9.52mm(3/8") 42N.m
Be careful that matters, such as wastes of sands, etc. shall not enter the pipe.
The standard pipe length is 5m. If it is over
5m, the function of the unit will be affected. If the pipe has
to be lengthened, the refrigerant should be charged, according to 20 g/m. But the charge of refrigerant
must be conducted by professional air conditioner engineer. Before adding additional refrigerant,
perform air purging from the refrigerant pipes and indoor unit using a vacuum pump,then charge
additional refrigerant.
CAUTION
In case the elevation A is more than 5m,
oil trap shoud be installed every 5~7m
Max. Length: B max =15m Max.Elevation: A
max =10m
In case the pipe length B is more than
10m,
the refrigerant should be charged, according to 20 g/m.
In case A is more than 5m
A
B
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
A
B
Outdoor unit
Indoor unit
Oil trap
6