Connecting
Requirement
For WH-MDC12H6E5 and WH-MDC16H6E5
This equipment’s power supply 1 complies with IEC/EN 61000-3-12 provided that the short circuit power S
sc
is
greater than or equal to 1100kW at the interface point between the user’s supply and the public system. It is the
responsibility of the installer or user of the equipment to ensure, by consultation with the distribution network
operator if necessary, that the equipment is connected only to a supply with a short circuit power S
sc
greater than
or equal to 1100kW.
The equipment’s Power Supply 1 complies with IEC/EN 61000-3-11 and shall be connected to a suitable supply
network, having services current capacity
≥
100A per phase. Please liaise with supply authority that the service
current capacity at the interface point is sufficient for the installation of the equipment.
The equipment’s Power Supply 2 complies with IEC/EN 61000-3-12.
The equipment’s Power Supply 2 complies with IEC/EN 61000-3-11 and shall be connected to suitable supply
network, with the following maximum permissible system impedance Z
max
= 0.193 ohm (
Ω
) at the interface.
Please liaise with supply authority to ensure that the Power Supply 2 is connected only to a supply of that
impedance or less.
Connecting with external device (optional)
All connections shall
follow to the local national wiring standard.
It is strongly recommended to use manufacturer-recommended parts and accessories for installation.
For connection to main PCB
1 Two-way valve shall be spring and electronic type, refer to “Field Supply Accessories” table for details. Valve
cable shall be (3 x min 1.5 mm
2
), of type designation 60245 IEC 57 or heavier, or similarly double insulation
sheathed cable.
* note: - Two-way Valve shall be CE marking compliance component.
- Maximum load for the valve is 9.8VA.
2 Three-way valve shall be spring and electronic type. Valve cable shall be (3 x min 1.5 mm
2
), of type
designation 60245 IEC 57 or heavier, or similarly double insulation sheathed cable.
* note: - Shall be CE marking compliance component.
- It shall be directed to heating mode when it is OFF.
- Maximum load for the valve is 9.8VA.
3 Room thermostat cable must be (4 or 3 x min 0.5 mm
2
), of type designation 60245 IEC 57 or heavier cord, or
similarly double insulation sheathed cable.
4 Maximum output power of booster heater shall be
≤
3 kW. Booster heater cable must be (3 x min 1.5 mm
2
),
of type designation 60245 IEC 57 or heavier.
5 Extra pump cable shall be (2 x min 1.5 mm
2
), of type designation 60245 IEC 57 or heavier.
6 Boiler contact cable shall be (2 x min 0.5 mm
2
), of type designation 60245 IEC 57 or heavier.
7 External control shall be connected to 1-pole switch with min 3.0 mm contact gap. Its cable must be (2 x min
0.5 mm
2
), double insulation layer of PVC-sheathed or rubber-sheathed cable.
* note: - Switch used shall be CE compliance component.
- Maximum operating current shall be less than 3A
rms
.
8 Tank sensor shall be resistance type, please refer to graph below for the characteristic and details of sensor.
Its cable shall be (2 x min 0.3 mm
2
), double insulation layer (with insulation strength of min 30V) of PVC-
sheathed or rubber-sheathed cable.
9 Room sensor zone 1 cable shall be (2 x min 0.3 mm
2
) double insulation layer of PVC-sheathed or rubber-
sheathed.
10 Outdoor air sensor cable shall be (2 x min 0.3 mm
2
) double insulation layer of PVC-sheathed or rubber-
sheathed.
-30 -20 -10
0
10
20
30
16000
14000
12000
10000
8000
˚C
6000
4000
2000
0
Tank sensor characteristic
R
es
is
tanc
e
Ω
Tank Sensor Resistance Vs Temperature
