Installation manual required for teco split aircondtioner. Reverse cycle LS0909Y. I have operation manual but not sure how to install and wire up. Many thanks.

Is the unit an AC only or a heat pump?
Wiring to the units should in the manual or online.
Both units proper house voltage to inside unit and outside unit.There will also be a two wire low voltage cable between thr two.This is so the inside unit can turn on the higher current draw of the compressor in the outside condenser unit thru it's relay.If you have a heat pump there will also be a set of two wires to the 4 way gas valve in the condenser unit to change from heating to cooling mode,a set of two wires to control the on/off function of the fan in the condenser unit when it needs to defrost and mayby a two wire set to a themal sensor in the condenser to sense if it is frosting up when system is in heat mode.
Try to get a wiring diagram and if you can't get to the point where you understand how to wire the unit don't guess! Call someone who knows wiring or call a pro, he can you money over the cost of replacing parts if unit is miswired.