Mitsubishi city multi PKFY-08NAMU-A, Technical & Service Manual

Page: 28 / 97

→
→
3
2
1
→
3
2
1
→
Control modes
Control details
3-1. Drain pump control
•Always drain pump ON during the COOL and DRY mode operation.
(Regardless of the thermo ON/ OFF)
•When the operation mode has changed from the COOL or DRY to the others
(including Stop), OFF the control after the drain pump ON for 3 minutes.
Drain sensor function
• Energize drain sensor at a fixed voltage for a fixed duration. After energizing,
compare the drain sensor’s temperature to the one before energizing, and judge
whether the sensor is in the air or in the water.
Basic control system
• While drain pump is turned on, repeat the following control system and judge
whether the sensor is in the air or in the water.
•Drain sensor temperature rise (
∆
t)
•Temperature of drain sensor before current is applied (T
0
)
•Temperature of drain sensor after current is applied (T
1
)
[
∆
t = T
1
– T
0
]
(1) Initial setting : Start at COOL mode and horizontal vane.
(2)Vane position : Horizontal
→
Downward A
→
Downward B
→
Downward C
→
Swing
PKFY-08NAMU-A is not equipped with the swing function.
: Horizontal
→
Downward A
→
Downward B
→
Downward C
(3) In case of PKFY-08NAMU-A and PKFY-12NGMU-A :
Restriction of the downward vane setting
When setting the downward vane A, B or C in [Med1], [Med2] or [Low] of the fan
speed notch, the vane changes to horizontal position after 1 hour have passed.
In case of PKFY-20NFMU-A and PKFY-32NFMU-A :
Restriction of the downward vane setting
When setting the downward vane A, B or C in [Low] of the fan speed notch,
the vane changes to horizontal position after 1 hour have passed.
4. Vane
(up/ down vane change)
3. Drain pump
Except for
PKFY-08NAMU-A.
Remarks
W
1 "SET FOR 1 HOUR"
appears on the
wired remote
controller.
Timing of
energizing
drain sensor
ON
OFF
Stand by for
a minute 30 sec.
Detect the
temperature
before
energizing
(T0)
Detect the
temperature
after
energizing
(T1) Judge whether
the sensor is in
the air or in the
water.
30 sec. Stand by for
a minute
·······Repeat
From the preceding page.
W
1 Drain sensor
Indoor control
p.c. board
CN31
W
2 If the unit is
without the drain
sensor, install
the jumper
connector.
Indoor control
p.c. board
CN31
When installing
the jumper
connector,
determine to
detect
compulsorily in
the air.
OC292-26
OC292--1.qxp 02.9.26 4:50 PM Page 26