Toshiba MMU-UP0071YHP-UL Service Manual page 22

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
Indoor units during stop/thermostat OFF or FAN
operation perform following controls when a refrigerant
(compressor oil) recovery signal is received from
outdoor unit at the cooling operation,
(1) Opening the indoor unit PMV at constant valve
opening. (For a maximum of about 4 minutes)
(2) Operating the drain pump for about one minute,
during recovery control and after the control
finished.
Also, indoor unit fan or louvers may operate
depending on the indoor unit type.
Indoor units during stop/thermostat OFF or FAN
operation perform following controls when a refrigerant
(compressor oil) recovery signal is received from
outdoor unit at the heating operation,
(1) Opening the indoor unit PMV at constant valve
opening. (For a maximum of about 20 minutes)
(2) TC2 temperature is detected to close its PMV.
Also, the fan, louvers, drain pump may operate for
about one minute after recovery control finished
depending on indoor unit types, until the number
of recovery control reaches the predetermined
number.
NOTE
The PMV, indoor fan, or louvers may operate through
the outdoor unit instruction.
For its detail, refer to the outdoor unit service guide.
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) 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) ON/OFF operation is available by input of HA
signal from the remote site when connected to
remote controller or the remote ON/OFF interface.
2) HA control outputs ON/OFF status to HA terminal.
3) The input-output specifications of HA conform to
JEMA standard.
for operation
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Remarks
Control is performed per two
hours or when the outdoor unit
determines its need.(It varies
depending on the indoor units
connected.)
Indoor unit during cooling
thermostat OFF or FAN
operation stops the indoor fan
and displays "Operation
standby ".
Control is performed per one
hour or when the outdoor unit
determines its need.(It varies
depending on the indoor units
connected.)
Usually the priority is given to
5 minutes at outdoor controller
side.
Check Code [P10]
• A model with a drain pump :
4-way
Concealed Duct
High Static Duct
Fresh air
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.