Service manual

ESIE03–01 General Functionality
Part 2 – Functional Description 2–13
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1.7 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.
Remarks
P In case of O.L. operation, O.L. will be activated +1K next time.
P In case of H.P. activation, O.L. will be activated -1K next time.
Used input The forced thermostat OFF control uses the following inputs:
Remark P In case of twin/triple applications the highest Tc is used.
Thermostat OFF
control
Indicator Starting conditions Result Reset
Freeze-up function: See page 2–29.
Cooling overload Outdoor heat
exchanger
temperature Tc
Tc > 63°C for 90 s contin-
uously
(min. 60 - max. 66°C for
practice function)
The thermo-
stat is
turned OFF.
Next start,
initial open-
ing E.V.:
+70pulses
(cooling)
+80pulses
(heating)
Remocon
OFF
Heating overload
(peak cut-off)
Indoor heat
exchanger
temperature Tc
Tc > 62.5°C for 30 s con-
tinuously
(min. 59.5 - max. 65.5°C
for practice function)
Discharge pipe
high temperature
Only for
R(Y)P71-250L
Discharge pipe
temperature T2
Td > 125°C for 20 s con-
tinuously
Td disconnection
Only for
R(Y)P71-250L
Discharge pipe
thermistor T2
Td is determined to be
disconnected from the
piping 5 min after the
compressor starts.
Td < 55°C
Td < Ta + 10°C
∆Td ≤ 5 K within 5 min
after start
Retry 6 x
until
final error
“F3”
Input
Connection on
indoor PCB
Connection on
outdoor PCB
Outdoor heat exchanger thermistor — R2T
Indoor heat exchanger thermistor R2T —
Discharge pipe thermistor — R3T