Lennox VRF VEC027N432U, User Manual, Page: 23 / 36

DC Inverter Multi VRF System
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(7) An all-pole disconnection device which has at least 3mm clearances in all poles, and
disconnection must be incorporated in the fixed wiring in accordance with the wiring rules.
(8) Details of type and rating for fuse:
Model:
VEC048N432U
,
VEC055N432U
,
VEC060N432U
.
Ceramic 250V5A (front main board), ceramic 250V3.15A (back main board).
Model:
VEC027N432U , VEC034N432U , VEC042N432U .
Ceramic 250V5A (front main board), ceramic 250V30A (front main board).
(9) Connect the unit to specialized grounding device and make sure it is securely grounded. It’s
a must to install air switch and current circuit breaker that can cut off the power of the entire
system. The circuit breaker should include magnetic trip function and thermal trip function so
that system can be protected from short circuit and overload.
(10) Grounding Requirements.
1) Air conditioner belongs to class I electrical appliance, so it must be securely grounded.
2) The yellow-green wire inside the unit is a ground wire. Do not cut it off or secure it with
tapping screws, otherwise it will lead to electric shock.
3) Power supply must include secure grounding terminal. Do not connect the ground wire
to the following:
①
Water pipe;
②
Gas pipe;
③
Drain pipe;
④
Other places that are deemed as not secure by professional technicians.
4.6.2 Wiring Diagram
(1) Connection of power cord and communication wire Separate power supply for IDU and
ODU.
Fig 4.6.2.1 Connection of power cord and communication wire for IDU and ODU
(2) Selection of circuit breaker and power cord.
Model Power supply
Circuit breaker
capacity
(A)
Number of ground wire
× Min sectional area
(mm
2
)
Number of power cord
× Min sectional area
(mm
2
)
VEC027N432U
220~240V 50Hz
208~230V 60Hz
25 1×2.5 2×2.5
VEC034N432U
220~240V 50Hz
208~230V 60Hz
25 1×2.5 2×2.5
VEC042N432U
220~240V 50Hz
208~230V 60Hz
32 1×2.5 2×2.5
VEC048N432U
220~240V 50Hz
208~230V 60Hz
40 1×6.0 2×6.0