Air Handlers
NOTE:
Y means Compressor control signal for the outdoor unit;
B which is energized under the heating mode means 4-way valve control
signal;
D means defrosting signal;
R means 24V AC power supply;
C means 24V common;
G means indoor unit fan signal for the indoor unit;
W1 means heater control signal.
NOTE:
For cooling only unit, there is no need to connect the B and D
terminals.
NOTE:
When outdoor defrosts, D of outdoor unit will send 24V signal to avoid
cold winds.
NOTE:
When the electric heating operate, the indoor unit is forced to open the
indoor unit fan.
①
.
High and low voltage wires should be led through different rubber rings of the
electric box cover.
②
.
Do not bundle up the thermostat wires or lay them side by side, otherwise
errors will occur.
③
.
High and low voltage wires should be secured separately. Secure the former
ones with big clamps and the latter ones with small clamps.
④
.
Use screws to tighten up the thermostat wires and power cords of unit on the
terminal board. Wrong connection may lead to fire hazard.
⑤
.
If the thermostat wires of unit and power cords are not correctly connected, the
air conditioner may get damaged.
⑥
.
Ground the unit through connecting the ground wire.
⑦
.
The units should comply with applicable local and national rules and
regulations on power consumption.
⑧
.
When connecting the power cords, make sure the phase sequence of the
power supply matches with the corresponding terminals, otherwise the
compressor will get reversed and operate abnormally.
30
Summary of Contents for NPFX24A
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