CD 30 ÷ 520
54
18—— WATER PUMP
Notice: the actual figure of controller of the pump is not the 220V power supply but
the ON/OFF switch!
Water pump will start at once after receiving the opening order and keep running
during the whole running term of the system.
Pump will close 2 minutes later after all the units having been shut down on cooling
or heating mode.
Pump can be closed directly on the pump mode.
19——System B compressor
Earthing wire
System B four-way valve
Earthing wire
20——Digital tube
On waiting mode: display unit address.
On running mode:
z Main unit display the current capacity of the digital compressor as 40, 60, 80 and 10.
(Notice “10” is followed by “.”)
z Auxiliary unit display 10. (Notice “10” is followed by “.”)
On failure or protection mode: display failure code or protection code.
21——System A compressor;
Earthing wire
Four-way valve of system A
Earthing wire
22——High speed of outdoor fan, controlled by T4.
23——Low speed of outdoor fan, controlled by T4.
24——PWM, used for digital compressor capacity adjustment. (Just valid for main unit).
25——Transformer input, 220V/AC.
26——Power input by three-phase four-wire system (E1 for failure code).
A, B, C phases should be supplied together with the 120 degree angle difference among
three phases. If it is not qualified, it may cause phases sequence failure or phases absent
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