Toshiba MMU-P0121H Service Manual page 39

Item
8. Freeze (1) In cooling operation, the air conditioner operates as de-
prevention scribed below based upon temp. detected by TC1 and TC2
control sensors.
(Low temp.
• When "J" zone is detected for 5 minutes, the command
release)
• In "K" zone, the timer count is interrupted, and held.
• When "I" zone is detected, the timer is cleared and the
• When the command frequency became S0 with
(˚C)
9. Cooling When the indoor units stand by, thermostat is OFF, or the
refrigerant/Oil indoor unit operates with "FAN" mode, PMV of the indoor unit is
recovery control opened by a certain degree when the cooling refrigerant/Oil
recovery signal is received from the outdoor unit.
10. Heating The indoor unit which stops operation, thermostat is OFF, or
refrigerant/Oil operates with "FAN" mode performs the following controls when
recovery the heating refrigerant/Oil recovery signal is received from the
control outdoor unit.
1) PMV of the indoor unit is opened by a certain degree.
2) Fan is stopped.
3)Temperature of TC2 is detected, and PMV is closed.
11. Short intermit- (1) For 5 minutes after the operation has started, the operation
tent operation is continued even if entering thermostat-OFF condition.
compensation
(2) However, if the thermostat has been turned off by changing
control
the set up temp., the thermostat is OFF with even the above
condition. The protective control has priority.
12. Drain pump (1) During "COOL" operation, the drain pump operates.
control
(2) When the float SW operates, the compressor stops and the
drain pump operates.
(3) When the operation of the float SW continues for 2 minutes,
a check code is generated.
13. Elimination of (1) When the air conditioner stops in the "HEAT" mode, drive
remaining the indoor fan with "LOW" mode for approx. 30 seconds.
heat
14. Auto louver (1) When the louver signal has been received from the remote
control controller or the central controller, the auto turn louver
operates if the indoor fan is operating.
Operation explanation and applied data, etc.
frequency becomes "S0" to the outdoor unit.
operation returns to the normal operation.
continua-tion of "J" zone, operation of the the indoor fan
in LOW mode until it reaches the "I" zone.
It is reset when the following conditions are satisfied.
1) TC1 > 12°C and > TC2 12°C
2) 30 minutes after the air conditioner has stopped.
P a
K
Q
J
TC1 TC2
P 10 –12
Q 0 –15
3-36
Remarks
• Only for 4-way ceiling
cassette type, operate the
indoor fan for approx. 3 to 4
min of the recovery operation.
• On the indoor unit in which
thermostat is OFF or which
operates with "FAN" mode,
"PRE-HEAT/DEFROST" go on.
• For 4-way ceiling cassette
type only, operate the indoor
fan for approx. 1 minute after
recovery operation.
CHECK code "0b"
When "0b" occurred, the
outdoor units stop and
"STANDBY" is displayed on the
remote controllers of all the
indoor units.