Toshiba MMU-AP0091H Installation Manual page 103

10-4. Drain Trap
1. When a drain pipe is connected to an indoor unit that will create
negative pressure (concealed duct high static pressure type),
install a drain trap.
2. Install one drain trap for each indoor unit.
(A drain trap that is installed downstream of a junction of drain
pipes from two or more indoor units will be ineffectual.)
3. Install a cleanout plug in the drain trap.
10-5. Drain Check
After the drain pipe has been fully installed, place water in the drain pan and confirm that the water drains
properly.
1) 4-way air discharge cassette type (with built-in drain pump)
<When checking after all electrical work has been completed>
1. While the cooling operation is in action, remove the cover of the water supply opening as illustrated below
and then use a water pump or other source to gradually add at least 1500 to 2000cc of water through the
water supply opening.
Check the draining action of the system by
listening for the sound of the drain pump.
If the drain pump sound changes from a
continuous sound to an intermittent sound,
the drain system is functioning normally.
2. After checking the system, re-attach the
cover for the water supply opening.
<When checking before all electrical work has been completed>
1. Firstly, unplug the float switch connector (CN34, 3P Red) in the electronic components box in the indoor
unit, and then supply single-phase 220/230/240V, 50Hz (or
terminals in the electronic components box. Never apply the voltage to terminals A , B , U1 , U2 .
The drain pump will not run if the float switch is not disconnected.
Following the same procedure as when checking the system after the electrical work has been
completed, check the draining action of the system by adding water through the water supply opening and
then listening for the sound of the drain pump.
2. When the check of the drain system is completed, do not forget to restore the float switch CN34
connector to its original condition. Also re-attach the cover for the water supply opening.
4-Way Air Discharge Cassette Type,
Concealed Duct Standard Type
CN34
Black
Pull out connector CN34 (Red) from P.C. board.
Black
Single phase
220/230/240V, 50Hz
220V, 60Hz
L N
White
Red
220V, 60Hz
2-Way Air Discharge Cassette Type
Remove
103
Plug
Drain piping
connecting port
Water supply
port
) power to L and N power
Float switch connector (CN34, 3P Red)
(Lead wire color : Black)
Electric parts box
50mm
50mm