Fisher FSAI-SU-92AE2 Service Manual page 30

T1-Td+ΔT
7.4.3.4Defrosting mode
AC will enter the defrosting mode according to
the value of temp. of T3 and the value range of
temp. change of T3 and also the compressor
running time.
During the defrosting mode, the compressor
keep running, indoor and outdoor motor will stop,
defrost lamp of the indoor unit will be lighted.
If any one of the following items is satisfied, the
defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80
seconds.
----The machine has run for 15 minutes in
defrosting mode.
7.4.3.5 Evaporator coil temperature
protection
T2
Decrease
Hold
Resume
When evaporator temperature temp. is more
than the setting
compressor will stop.
Off
protection value,
7.4.4 Auto-mode
This mode can be chosen with remote
controller and the setting temperature can be
changed between 17° C~30° C
In auto mode, the machine will choose cooling,
heating or fan-only mode according to ΔT (ΔT
=T1-Ts).
T1-Ts
Heating*: For cooling only models, they will run
at fan speed
Indoor fan will run at auto fan of the relevant
mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating
and cooling, the compressor will keep stopping
for certain time and then choose mode
according to T1-Ts.
If the setting temperature is modified, the
machine will choose running function again.
7.4.5 Drying mode
Indoor fan speed is fixed at breeze and can't be
changed. The louver angle is the same as in
cooling mode.
All protections are active and the same as that
in cooling mode.
7.4.6 Forced operation function
Forced cooling mode:
The compressor and outdoor fan keep running
and the indoor fan runs at low speed. After
running for 30 minutes, AC will turn to auto
mode with 24℃ setting temperature.
the Forced auto mode:
The action of forced auto mode is the same as
30
Cooling
Fan only
Heating*