Toshiba MMD-AP0721HP-UL1 Service Manual page 18

NO. Item
Cooling oil
While the outdoor unit is recovering cooling oil (refrigerant), the indoor
(refrigerant)
units perform the following control tasks:
recovery control [common for operational (cooling thermostat ON / thermostat OFF / FAN),
as well as nonoperational indoor units]
1) Open the indoor PMV to a certain degree.
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2) Engage in recovery control for a specified period of time and return
3) Operate the drain pump throughout the recovery control period and
Heating While the outdoor unit is recovering heating refrigerant (oil), the indoor
refrigerant (oil) units perform the following control tasks:
recovery
1) Open the indoor PMV to a certain degree.
control
2) Control the indoor fan according to the operation mode.
[Indoor units operating in heating thermo ON / OFF state]
Let the indoor fan continue operating, but turn it off if the temperature
of the indoor heat exchanger drops.
[Indoor units operating in FAN mode]
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Turn off the indoor fan and display "HEATING STANDBY
remote control.
[Non-operational indoor units]
Keep the indoor fan turned off.
3) Terminate the recovery operation depending on the TC2
4) Operate the indoor fan and drain pump for about 1 minute after the
Defrosting While the outdoor unit is engaged in defrosting control, the indoor units
perform the following control tasks:
control
1) Open the indoor PMV to a certain degree.
2) Control the indoor fan according to the operation mode.
[Indoor units operating in heating thermo ON / OFF state]
Let the indoor fan continue operating for a while, but turn it off as the
temperature of the indoor heat exchanger drops.
[Indoor units operating in FAN mode]
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Let the indoor fan continue operating.
[Non-operational indoor units]
Keep the indoor fan turned off.
3) As defrosting control comes to an end, it gives way to heating
Short 1. For 5 minutes after startup, the system is forced to continue operating
intermittent even if it reaches the thermo OFF region.
operation
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2. However, priority is given to cooling / heating selection, operation
compensation
standby, and protective control, so that there is no overriding of
control
thermo OFF in these cases.
Elimination of 1. When the air conditioner is turned off after engaging in heating operation,
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residual heat the indoor fan is operated for about 30 seconds in "breeze" mode.
Specification outline
to normal cooling operation at the end of this period upon
terminating the control.
for about 1 minute after it.
temperature reading.
The timing of termination is determined by each indoor unit.
termination of the recovery operation. (Applicable to compact 4-way
cassette type and 1- way cassette type)
refrigerant (oil) recovery control.
(For control details, see "9. Heating refrigerant (oil) recovery control" above.)
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Remarks
• Recovery operation
normally takes
place roughly every
2 hours.
• The opening
position of the
indoor PMV
depending on the
type and capacity
of the indoor unit.
• Recovery
operation
normally takes
place roughly
every hour.
• The opening
position of the
indoor PMV
depending on the
" on the
type and capacity
of the indoor unit.
• For defrosting
commencement
conditions, see 5
Control Outline "7.
Defrosting control
(reverse defrosting
method)" in SMMS-e
Outdoor Unit
Service Manual
SVM-16039 above.
• The opening
position of the
indoor PMV
depending on the
type and capacity
of the indoor unit.