Multi Variable Air Conditioners Duct Type Indoor Unit
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4.3.3 Test of Drainage System
Models without water pump
(1) Fill some water to the water tray of indoor unit as following.
1) Connect the drain hose to the other drain connection pipe of water tray and fill about 1L
water (as shown in Fig 4.18). (Remove the drain hose after finishing testing and then put
on the plug of water tray.)
2) Spray 1L water on evaporator with sprayer, as shown in Fig 4.19
Fig 4.18 Fig 4.19
(2) Check if the water drains smoothly from the drain pipe and check if there is water leakage on
the connection pipe.
(3) Arrange insulation of drain hose and pipe clamp after checking the drain system.
Models with water pump
(1) Fill some water to the water tray of indoor unit as following.
1) Connect the drain hose to the other drain connection pipe of water tray and fill about 1L
water (as shown in Fig 4.18). (Remove the drain hose after finishing testing and then put
on the plug of water tray.)
2) Spray 1L water on evaporator with sprayer, as shown in Fig 4.19
(2) Start the water to check if water drain smoothly. The starting method of water pump is as
below.
1) If project debugging of unit has been done, please set the indoor unit in cooling or dry
mode. In this case, the water pump will operate automatically.
2) If electrical wiring of unit hasn’t been done, please open the electric box cover. Connect
one phase power cord at L1, N or L, N of wiring board; about 60s after connecting power
supply, indoor unit will report “C0” communication malfunction. In this case, the water
pump will automatically operate for 10min and then stop; after checking the drain system,
please cut off power supply, disconnect power cord and then put on the electric box cover.
(3) Check if the water drains smoothly from the drain pipe and check if there is water leakage on
the connection pipe.
(4) Arrange insulation of drain hose and pipe clamp after checking the drain system.
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