Toshiba MMU-AP0072H2UL-1 Service Manual page 34

No. Item
9 Recovery control
for heating
refrigerant (Oil)
10 Compensation
control for short
intermittent
operation
11 Drain pump
control
12 Elimination of
retained heat
13 Display of filter
sign [ ]
(Not provided to
the wireless type)
∗ Separately set
type
TCB-AX21UL
is prepared.
Outline of specifications
The indoor unit which is under STOP/Thermo-OFF
status or which operates in [FAN] mode performs the
following controls when it received the heating
refrigerant (Oil) recovery signal from the outdoor unit.
1) Opens PMV of the indoor unit with a constant
opening degree.
2) Detects temperature of TC2 and then closes PMV.
3) Counts No. of recovery controls and operates the
indoor fan and the drain pump for approx. 1
minute after finish of recovery control until the
control count reaches the specified count.
1) For 3 minutes after start of operation, the opera-
tion is forcedly continued even if the unit enters in
Thermo-OFF condition.
2) However the thermostat is OFF giving prior to
COOL/HEAT selection, READY
and protective control.
1) In cooling operation (including DRY operation),
this control anytime operates the drain pump.
2) During operation of the drain pump, if the float
switch operates, the drain pump continuously
operates and a check code is issued.
3) During stop status of the drain pump, if the float
switch operates, the thermostat is forcedly off and
this control operates the drain pump. After
continuous operation of the float switch for approx.
5 minutes, this control stops the operation and a
check code is issued.
1) When the unit stopped from [HEAT] operation, the
indoor fan operates with [L] for approx. 30 seconds.
1) The filter sign is displayed with LC by sending the
filter-reset signal to the remote control when the
specified time (150H/2500H) elapsed as a result of
integration of the operation time of the indoor fan.
2) The integrated timer is cleared when the filter-reset
signal is received from the remote control.
In this time, if the specified time elapsed, the
counted time is reset and the LC display is deleted.
Filter time
for operation
2500H
34
Remarks
• The indoor unit which is
under thermo-OFF (COOL)
status or which operates in
[FAN] mode stops the indoor
fan and displays [READY
• Recovery operation is usually
performed every 1 hour.
(When there is even 1
indoor unit which the
thermo unit is off)
Usually the priority is given to
5 minutes at outdoor control
side.
Check Code [P10]
[ FILTER] goes on.
].