Heat Pump
Unitherm 3 R32
35
insulated cotton. If necessary, install heating device for pipeline to prevent the pipeline from freezing.
(e) Hot water supplied from insulated water tank depends on pressure of water tap, so there must be supply of
tap water.
(f) During using, the cut-off valve of cooling water inlet of water tank should be kept normally on.
18.4 Electric wiring work
18.4.1 Wiring principle
General principles
(1) Wires, equipment and connectors supplied for use on the site must be in compliance with provisions of
regulations and engineering requirements.
(2)
Only electricians holding qualification are allowed to perform wire connection on the site.
(3) Before connection work is started, the power supply must be shut off.
(4) Installer shall be responsible for any damage due to incorrect connection of the external circuit.
(5) Only copper wires are allowed to be used.
(6) Connection of power cable to the electric cabinet of the unit
(7) Power cables should be laid out through cabling trough, conduit tube or cable channel.
(8) Power cables to be connected into the electric cabinet must be protected with rubber or plastic to prevent
scratch by edge of metal plate.
(9)
Power cables close to the electric cabinet of the unit must be fixed reliably to make the power terminal in
the cabinet free from an external force.
(10) Power cable must be grounded reliably.
18.4.2 Specification of power supply wire and leakage switch
Power cable specifications and Leakage switch types in the following list are recommended.
Model
Power Supply
Leakage
Switch
Minimum Sectional
Area of Earth Wire
Minimum
Sectional Area
of Power Supply
Wire
V,Ph,Hz
(A)
(mm
2
)
(mm
2
)
230V,~,50Hz
16
1.5
1.5
CH
-H
P6.0SIRK
3
(O)
CH
-H
P6.0SIRK
3
(I)
20
6.0
6.0
CH
-H
P8.0SIRK
3
(O)
230V,~,50Hz
25
4.0
4.0
CH
-H
P1
0
SIRK
3
(O)
25
4.0
4.0
CH
-H
P8.0SIRK
3
(I)
40
6.0
6.0
CH
-H
P1
0
SIRK
3
(I)
40
6.0
6.0
Notes
(a) Leakage Switch is necessary for additional installation. If circuit breakers with leakage protection are in use,
action response time must be less than 0.1 second, leakage circuit must be 30mA.
(b) The above selected power cable diameters are determined based on assumption of distance from the
distribution cabinet to the unit less than 75m. If cables are laid out in a distance of 75m to 150m, diameter of
power cable must be increased to a further grade.
(c) The power supply must be of rated voltage of the unit and special electrical line for air-conditioning.
(d) All electrical installation shall be carried out by professional technicians in accordance with the local laws
and regulations.
(e) Ensure safe grounding and the grounding wire shall be connected with the special grounding equipment of
the building and must be installed by professional technicians.
