Daikin R407C PLUS, Service Manual

Page: 61 / 267

Outline of Control (Outdoor Unit) < Symbols using in this manual > Si33-105
50 Function R407C PLUS Series Heat Recovery System
3.1 Malfunction Stop
3.1.1 Judgement of Sensor Malfunction
!
Stops operation when temperature or pressure sensor detects an abnormal value.
Contents
!
When each sensor detects that a value exceeds upper or lower limit shown in the following
table. (Malfunction stop which can be reset automatically)
!
In oil return (cooling/heating) and defrosting operation and for 10 minutes after those
operations, both of temperature and pressure sensors are not judged as malfunction even
when the value exceeds the upper or lower limit shown in the above table.
!
In addition to the above, Pe is not judged as malfunction in compressor stop or 3 minutes
after startup, oil return operation in heating, "Drooping control by Pc", and "Inverter current/
temperature drooping". The pressure sensor is judged as malfunction when the pressure
value exceeds that shown in the above table for 1 minute continuously.
!
Regarding the lower limit of discharge pipe temperature, Tdi is not judged as malfunction in
inverter compressor stop and for 10 minutes after startup, and Tds1 and 2 are not judged as
malfunction in each commercial power supply compressor stop and for 10 minutes after
startup. Regarding the upper limit of discharge pipe temperature, the malfunction
judgement is conducted after 10 minutes upon completion of oil return and
defrosting, and in each compressor stop. (Same as for other thermistors)
!
Since Ts1, 2 and 3 become discharge side in cooling cycle, they do not detect malfunction.
Symbol Apparatus No. Symbol in wiring
diagram
Item to detect Upper limit Lower limit
Pc SENPH SENPH Discharge pressure 3.38MPa 0.01MPa
Pe SENPL SENPL Suction pressure 1.17MPa –0.01MPa
Ta Th1 R1T
Outdoor
temperature
90°C
"
1 –43.6°C
Tb1, 2, 3 Th2 R21T, R22T, R23T
Distribution pipe
temperature
90°C
"
2 –43.6°C
Tdi Th3-11 R31T
Discharge pipe
temperature
(Inverter
compressor)
196°C –10.1°C
Tds1, 2 Th3-12,13 R32T, R33T
Discharge pipe
temperature
(Constant-speed
compressor)
196°C –10.1°C
Ts1, 2, 3 Th4-11, 12, 13 R41T, R42T, R43T
Suction pipe
temperature
90°C –43.6°C
Trac Th7 R6T
Accumulator outlet
temperature
90°C –43.6°C
Trev Th8 R8T
Receiver outlet
temperature
90°C –43.6°C