Johnson ICEBERG Serie Manuel D'instructions page 89

Please use H07RN-F for the power wire, all the cable are connect to high voltage except for thermistor
cable and cable for user interface.
Equipment must be grounded.
All high-voltage external load, if it is metal or a grounded port, must be grounded.
All external load current is needed less than 0.2A, if the single load current is greater than 0.2A, the load must be
controlled through AC contactor.
AHS1" "AHS2" wiring terminal ports only provide the switch signal.
Expansion valve E-Heating tape,Plate heat exchanger E-Heating tape and Flow switch E-Heating tape share a
control port.
Field wiring guidelines
Most field wiring on the unit is to be made on the terminal block inside the switch box. To gain access to the
terminal block, remove the switch box service panel (door 2).
Switch off all power including the unit power supply and backup heater and domestic hot water tank
power supply (if applicable) before removing the switch box service panel.
Fix all cables using cable ties.
A dedicated power circuit is required for the backup heater.
Installations equipped with a domestic hot water tank (field supply) require a dedicated power circuit for the
booster heater. Please refer to the domestic hot water tank Installation & Owner's Manual. Secure the wiring in
the order shown below.
Lay out the electrical wiring so that the front cover does not rise up when doing wiring work and attach
the front cover securely.
Follow the electric wiring diagram for electrical wiring works (the electric wiring diagrams are located on the
rear side of door 2.
Install the wires and fix the cover firmly so that the cover may be fit in properly.
9.6.3 Precautions on wiring of power supply
Use a round crimp-style terminal for connection to the power supply terminal board. In case it cannot be
used due to unavoidable reasons, be sure to observe the following instructions.
Do not connect different gauge wires to the same power supply terminal. (Loose connections may cause
overheating.)
When connecting wires of the same gauge, connect them according to the figure below.
Use the correct screwdriver to tighten the terminal screws. Small screwdrivers can damage the screw
head and prevent appropriate tightening.
Over-tightening the terminal screws can damage the screws.
Attach a ground fault circuit interrupter and fuse to the power supply line.
In wiring, make certain that prescribed wires are used, carry out complete connections, and fix the wires so
that outside force cannot affect the terminals.
9.6.4 Safety device requirement
1. Select the wire diameters (minimum valve) individually for each unit based on the table 9-1 and table 9-2，
where the rated current in table 9-1 means MCA in table 9-2. In case the MCA exceeds 63A, the wire diameters
should be selected according to the national wiring regulation.
2. Maximum allowable voltage range variation between phases is 2%.
3. Select circuit breaker that having a contact separation in all poles not less than 3 mm providing full discon-
nection，where MFA is used to select the current circuit breakers and residual current operation breakers.
NOTE
WARNING
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