Toshiba MMY-MUP0961HT6P-UL Service Manual page 67

No. Item
9 Refrigerant (Oil)
recovery control in
cooling operation
10 Refrigerant (Oil)
recovery control
in heating
operation
11 Compensation
control for short
intermittent
operation
12 Drain pump
control
13 Elimination of
retained heat
14 HA control
Outline of specifications
The indoor unit which is under STOP/Thermostat-
OFF status or which operates in [FAN] mode
performs the following controls when it received the
refrigerant oil recovery signal from the outdoor unit at
the cooling operation.
1) Opens PMV of the indoor unit with a constant
opening degree.
2) Operates the drain pump for approx. 1 minute
during recovery control and after finish of control.
Louvers may open depending on indoor unit types.
The indoor unit which is under STOP/Thermostat-OFF
status or which operates in [FAN] mode performs the
following controls when it received the refrigerant (Oil)
recovery signal from the outdoor unit at the heating
operation.
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.
Louvers may open depending on indoor unit types.
1) For 3 minutes after start of operation, the opera-
tion is forcedly continued even if the unit enters in
Thermostat-OFF condition.
2) However the thermostat is OFF giving prior to
COOL/HEAT selection, READY
and protective control.
1) Drain pump operates while in cooling operation.
(including DRY operation)
2) While the drain pump is operating, if the float
switch is operated, the outdoor unit will stop
operating but the drain pump will keep
continuously operating. After that, the check code
is issued.
3) When the drain pump stops operating, if the float
switch is operated, the outdoor unit will stop and
the drain pump will start operating. After the float
switch is being operating for roughly 5 minutes, the
check code will be issued.
1) When the unit stopped from [HEAT] operation, the
indoor fan operates with [L] for approx. 30 seconds.
1) ON/OFF operation is available by input of HA
signal from the remote site when connecting to
remote controller or the remote ON/OFF interface.
2) The HA terminal is ON/OFF depending on HA
control output.
3) The I/O specifications of HA is in accordance with
JEMA standard.
for operation
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Remarks
• Recovery operation normally
takes place when it detect that
the refrigerant is less.
• A model with a drain pump :
4-way cassette
Compact 4-way
2-way cassette
1-way cassette (YH) (SH)
• The indoor unit which is under
thermostat-OFF (COOL) status
or which operates in
[FAN] mode stops the indoor
fan and displays [READY
• Recovery operation normally
takes place when it detect that
the refrigerant is less.
• A model with a drain pump :
4-way cassette
Compact 4-way
2-way cassette
1-way cassette (YH) (SH)
Usually the priority is given to
5 minutes at outdoor controller
side.
Check Code [P10]
• A model with a drain pump :
4-way cassette
Compact 4-way
2-way cassette
1-way cassette (YH) (SH)
When using HA terminal
(CN61) for the remote ON/
OFF, a connector sold sepa-
rately is necessary.
In case of group operation, use
the connector to connect HA
terminal to either master or
follower indoor unit.
].