Toshiba Carrier MMU-AP0074HPUL Service Manual page 23

No. Item
10 Recovery control
for heating
refrigerant (Oil)
11 Compensation
control for short
intermittent
operation
12 Drain pump
control
13 Elimination of
retained heat
14 HA control
15 Display of filter
sign [ ]
(Not provided to
the wireless type)
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 5 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) 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 I/O specifications of HA conform to JEMA
standard.
1) The filter sign is displayed with LC by sending the
filter-reset signal to the remote controller 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 controller.
In this time, if the specified time elapsed, the
counted time is reset and the LC display is deleted.
Filter time
for operation
2500H
- 23 -
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.
Check Code [P10]
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 header or
follower indoor unit.
[ FILTER] goes on.
].