Mitsubishi Electric City Multi PMFY-P06NBMU-E Technical & Service Manual page 14

From the preceding page
Control modes
3. Drain pump
3-1. Drain pump control
Drain sensor function
• The indoor circuit board energizes the drain sensor at a fixed voltage for a fixed
duration. After energizing, the circuit board then compares the drain sensor's
temperature to the one before energizing, and judges whether the sensor is in
the air or in the water.
Basic control system
• While drain pump is turned on, it will repeat the following control system and judge
whether the sensor is in the air or in the water.
Timing of
energizing
drain sensor
•Drain sensor temperature rise ( t)
•Temperature of drain sensor before current is applied (T
•Temperature of drain sensor after current is applied (T
[ t = T
4. Vane (1) Initial setting : Start at COOL mode and horizontal vane.
(2) Vane position : Horizontal
(up/ down vane change)
(3) Restriction of the downward vane setting
• Always drain pump ON during the COOL and DRY mode operation.
(Regardless of the thermostat ON/ OFF)
• When the operation mode is changed from COOL or DRY to any other mode
(including Stop), the drain pump continues to run for 3 minutes.
ON
OFF
Stand by for
a minute
Detect the
temperature
before
energizing.
(T0)
– T ]
1 0
When setting the downward vane A, B or C in [Medium1], [Medium2] or [Low] of
the fan speed notch, the vane changes to horizontal position after 1 hour has
passed.
Control details
30 Stand by for 30
sec. a minute sec.
Detect the
temperature
after
energizing.
(T1)
)
0
)
1
Downward A Downward B
14
1
Drain sensor
Indoor controller
board
CN31
·······Repeat
Judge whether
the sensor is in
the air or in the
water.
1
"Only 1 Hr"
Downward C Swing
appears on the
wired remote
controller.
Remarks
1
2
3