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AHU-KIT
① The H, M, L of fan gear lines and the 1, 2 of Lines of fault signal from external feedback are shorted by the
factory default.
② Neutral line of fan connects to the N.
It can be connected to any of them (H, M, L) when there is only one gear.
Disconnect the short cable between H and M when there are two gears, then connect the high gear cable to H,
and connect low gear cable to either M or L.
When there are three gears, disconnect the short cables between H and M, M and L, then connect the high gear
cable, middle gear cable and low gear cable to H,M,L for each.
③ The lines of fault signal from external feedback are connected to the 1, 2.The line is a dry contact and closed
normally. If the line is closed, it represents no fault and the system operates normally; if the line is disconnected,
it represents malfunction and the system will stop.
④ Disconnect the short cable between 1 and 2 when there is fault signal, and connect the signal cable to 1 and 2.
⑤ Pull the wires inside through the screw nut and close the nut firmly in order to ensure a good pull relieve and
water protection.
⑥ Connect the fan cable of IDU and fan error information cable to either AHU-KIT.
⑦ Put through the wires to the coil, tighten the coil while maintaining loose condition of wires to ensure it is not
closely tied up and is waterproof.
⑧ When power supply is 208V, connect the preliminary transformer to the red and blue wires according to circuit
diagram. When power supply is 230V, exchange the black wire on wiring board XT6 with the blue wire on wiring
board XT3. Provide a voltage of 24V for secondary transformer under these two situations. Please note that
transformer function is available only when the fan is in "1" notch.
4.5.1.2 Wire connection of multiple AHU-KIT control parts
When multiple AHU-KITs control a air handling unit, connect fan control wire and external
signal feedback signal wire of air handling unit to any one AHU-KIT. Please refer to the wiring
method of AHU-KIT for the connection method.
4.6 Installation of the Temperature sensors
4.6.1 Refrigerant Temperature sensors
Location of the temperature sensor: A correct installation of the temperature sensors is
required to ensure a good operation.
(1) IN Temp. sensor(Liquid Temp. sensor)
Install the IN temperature sensor after the distributor and on the coldest temperature pipe of a
heat exchanger.
(2) OUT Temp. sensor (Gas Temp. sensor)
Install the OUT temperature sensor 200mm after the outlet of the heat exchanger.
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