Forced Thermostat Off - Daikin Sky Air R-407C Service Manual

ESIE02–01
1.8

Forced Thermostat OFF

Applicable units All indoor units
Purpose The outdoor unit independently turns its thermostat OFF by means of control other than thermostat
OFF commands from the indoor unit.
Method The table below contains the different conditions for which the thermostat is turned OFF by the outdoor
unit.
Thermostat OFF
control
Freeze-up function: See page 2–27.
Cooling overload
Only for
R(Y)P71-250B
Heating overload
(peak cut-off)
Discharge pipe
high temperature
Only for
R(Y)P71-250B
Td disconnection
Only for
R(Y)P71-250B
Used input The forced thermostat OFF control uses the following inputs:
Input
Outdoor heat exchanger thermistor
Indoor heat exchanger thermistor
Discharge pipe thermistor
Part 2 – Functional Description
Indicator Starting conditions
Outdoor heat Tc > 63˚C for 90 s contin-
exchanger uously
temperature Tc (min. 60 - max. 66˚C for
practice function)
Indoor heat Tc > 62.5˚C for 30 s con-
exchanger tinuously
temperature Tc (min. 59.5 - max. 65.5˚C
for practice function)
Discharge pipe Td > 125˚C for 20 s con-
temperature T2 tinuously
Discharge pipe Td is determined to be
thermistor T2 disconnected from the
piping 5 min after the
compressor starts.
Td < 55˚C
Td < Ta + 10˚C
∆
Td ≤ 5 K
General Functionality
Result Reset
The thermo-
stat is
turned OFF.
Next start,
initial open-
ing E.V.:
+ 70 pulses
(cooling)
Remocon
+ 80 pulses
OFF
(heating)
Retry 6 x
until
final error
"F3"
Connection on Connection on
indoor PCB outdoor PCB
— R2T
R2T —
— R3T
1
2
3
4
5
2–13