Wiring Size And Minimum Requirements Of The Protection Devices - Hisense Hi-Therma Series Service Handbook

●
Do not connect the power supply to the unit prior to filling
the space heating circuit (and DHW circuit if it were the
case) with water and checking water pressure and the
total absence of any water leakage.
● Do not connect or adjust any wiring or connections unless
the main power switch is OFF.
●
When using more than one power source, check and
ensure that all of them are turned OFF before operating
the unit.
● Avoid wiring installation in contact with the refrigerant
pipes, water pipes, edges of plates and electrical
components inside the unit to prevent damage, which may
cause electric shock or short circuit.
● Turn OFF the main power switch to the unit and wait for
more than 10 minutes before electrical wiring work or a
periodical check is performed.
●
Check to ensure that the outdoor fan have stopped before
electrical wiring work or a periodical check is performed.
●
Use a dedicated power circuit for the unit. Do not use a power
circuit shared with the unit or any other appliance.
●
Make sure that all wiring and protection devices are properly
selected, connected, identified and fixed to the corresponding
terminals of the unit, specially the protection (earth) and power
wiring, taking into account the applicable national and local
regulations. Establish proper earthing; Incomplete earthing
may cause electrical shock.
● Protect the unit against the entry of small animals (like rodents)
which could damage the drain pipe and any internal wire or any
other electrical part, leading to electric shock or short-circuit.
●
Keep a distance between each wiring terminal and attach
insulation tape or sleeve as shown in the figure.
Tape or sleeve
● Tightly secure the power source wiring using the cord clamp
inside the unit.
●
Check to ensure that the electrical resistance is more than 1
megohm, by measuring the resistance between ground and
the terminal of the electrical parts. If not, do not operate the
system until the electrical leakage is found and repaired.
●
The DHW heater is an accessory which is field-supplied. When
the DHW heater is being installed, the power supply cables
must be reselected according to the actual load current.
8.4.10.5 WIRING SIZE AND MINIMUM REQUIREMENTS
OF THE PROTECTION DEVICES
(1) Connect the power supply wires and the earth wire to
the terminal board in the electrical control box refer to
chapter 8.3.10.2.
(2) Do not wire in front of the fixing screw of the service
panel.
If do, the screw can not be removed.
(3) Use shielded twist pair for controller.
● The tightening torque of each screw shall be as follows.
M4:
M5:
M6:
M8:
M10: 18.0 to 23.0 N·m
Keep the above tightening torque when wiring work.
●
Ensure specifically that there is an Earth Leakage Breaker
(ELB) installed for the units.
● If the installation is already equipped with an Earth Leakage
Breaker (ELB), ensure that its rated current is large enough to
hold the current of the units.
●
Electric fuses can be used instead of magnetic Circuit Breakers
(CB). In that case, select fuses with similar rated values as the
CB.
● The Earth Leakage Breaker (ELB) mentioned on this manual
is also commonly known as Residual Current Device (RCD) or
Residual Current Circuit Breaker (RCCB).
●
The Circuit Breakers (CB) are also known as Thermal-
Magnetic Circuit Breakers or just Magnetic Circuit Breakers
(MCB).
● Total wiring length for controller can be extended up to 500m.
If total wiring length less than 30m, it is possible to use the
normal wiring (0.3mm
193
Installation
1.0 to 1.3 N·m
2.0 to 2.5 N·m
4.0 to 5.0 N·m
9.0 to 11.0 N·m
2
) except shielded twist pair.