Air-to-water Heat Pump
21
10.5 Requirements on water quality
Paramete
Parametric value
Unit
pH(25°C)
6.8~8.0
—
Cloudy
< 1
NTU
Chloride
< 50
mg/L
Fluoride
< 1
mg/L
Iron
< 0.3
mg/L
Sulphate
< 50
mg/L
SiO
2
<30
mg/L
Hardness(count CaCO
3
)
< 70
mg/L
Nitrate(count N)
< 10
mg/L
Conductance(25°C)
< 300
μs/cm
Ammonia (count N)
< 0.5
mg/L
Alkalinity(count CaCO
3
)
< 50
mg/L
Sulfid
Cannot be detected
mg/L
Oxygen consumption
< 3
mg/L
Natrium
< 150
mg/L
10.6 Electric wiring work
10.6.1 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) Caution --- MUST use copper wires.
(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.
10.6.2 Specification of power supply wire and leakage switch
Power cable specifications and Leakage switch types in the following list are recommended.
Model
Power Supply
Air Break Switch
Minimum Section Area
of Earth Wire
Minimum Section Area of
Power Wire
V, Ph, Hz
A
mm
2
mm
2
GRS-Cm18PdRe/NhA-M 380-415V 3N~ 50Hz
20
2.5
2.5
NOTES:
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.
(1) The above selected power cable diameters are determined based on assumption of distance
