P10 Indoor Unit Float Switch Operation - Panasonic 2WAY Multi Technical & Service Manual

P10 Indoor Unit Float Switch Operation

(Cannot be detected when the water heat exchanger unit is connected.)
Error detection method
• Detects when indoor control board connector FS (red) CN034/CN030 1-3 are open, and determines an error.
• The sensor connected between No.1 and No.3 of connector FS (red) CN034/CN030 is normally a drain
fl oat switch. However, some models do not have a drain fl oat switch. These models have No.1 and No.3 of
connector FS (red) CN034/CN030 short-circuited with a wire.
• The drain fl oat switch turns the contact OFF when the drain water overfl ows, and the contact turns ON when
the water level falls.
• The connection method and protective devices differ among indoor units. For details, see the electric circuit
diagrams for each indoor unit.
• Models with built-in drain fl oat switch
S-22/28/36/45/56/73ML
S-28/36/45/56/73MD
S-22/28/36/45/56/73/106/140/160MU
S-22/28/36/45/56MY
S-73/106/140/224/280ME
S-22/28/36/45/56/60/73/90/106/140/160MF
S-22/28/36/45/56MM
• Models shipped with connector FS (red) CN034/CN030 No.1 and No.3 short-circuited with a wire Models
not listed above
Troubleshooting
1
Model with drain fl oat switch built in?
1-1
Check for poor contact or broken wire in Indoor control board connector FS (red) CN034/
1-2
CN030 1-3 wiring (connector) → Repair
1-3 Drain water overfl owed?
1-4 Drain pump operating?
1-5 Is AC200V applied to drain pump?
Is AC200V applied across indoor control board connector DP
1-6
(blue) CN068 No. 1-No. 3?
Check for poor contact or broken wire in Indoor control board connector DP (blue) CN068 1-3
1-7
wiring → Repair
Conduction in drain fl oat switch? Unplug connector and
1-8
check.
Repair any poor connections, broken wires, etc. in the drain fl oat switch connector and
1-9
between No. 1 and No. 3 indoor control board connectors FS (red) CN034/CN030.
1-10 Check draining of drain hose/tubes and repair as necessary (clean or replace fi lter for UH)
● The designation (/) is used in the table to indicate indoor boards for DC and AC motor models.
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
● See instructions packaged with servicing indoor board for procedure on replacing indoor control board.
IV–87
Yes 1-3
No 1-2
Yes 1-4
No 1-8
Yes 1-10
No 1-5
Yes Replace drain pump
No 1-6
Yes 1-7
Replace indoor control
No
board
Yes 1-9
Replace drain fl oat
No
switch