Toshiba HFCR407C Service Manual page 65

Item Operation explanation and applied data, etc.
6. Air volume (1) By the command from the remote controller or the central controller, "HIGH", "MED.", • During stop
control "LOW", or "AUTO" operation is permissible.
(2) While air volume is in AUTO mode, the air volume is changed according to the
difference between Ta and Ts.
COOL
+2
+1
Ts
7. Freeze (1) In cooling operation, the air conditioner operates as described below based upon
prevention temp. detected by TC1 and TC2 sensors.
control (Low • When "J" zone is detected for 5 minutes, the command frequency becomes
temp. release) "S0" to the outdoor unit.
• In "K" zone, the timer count is interrupted, and held.
• When "I" zone is detected, the timer is cleared and the operation returns to
normal operation.
• When the command frequency becomes S0 with continuation of "J" zone,
operation of the indoor fan in LOW mode occurs until it reaches the "I" zone.
It is reset when the following conditions are satisfied.
TC1 ≥ 12 °C and TC2 ≥ 12 °C
1)
2) 30 minutes after the air conditioner has stopped.
P
(°C)
Q
8. Cooling When the indoor units stand by, thermostat is OFF, or unit operates with "FAN" mode,
refrigerant/ PMV of the indoor unit is opened by a certain degree when the cooling oil/heating
Heating oil refrigerant recovery signal is received from the outdoor unit.
recovery
control
9. Short (1) For 5 minutes after the operation has started, the operation is continued even if
intermittent entering thermostat-OFF condition.
operation (2) However, if the thermostat has been turned off by changing the set-up temp., the
compensation thermostat is OFF with even the above condition. The protective control has priority.
control
10. 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.
Outline of control
Indoor units
HEAT
+1
HIGH
Ts
MED
-1
LOW
-2
a
I
K
J
65
Ultra low
compressor
off
LOW
MED
HIGH
TCI TC2
P 10 -12
Q 0 -15
Remarks
operation, control to
prevent cold draft is
determined by TC2.
• Only for 4-way/2-
way ceiling cassette
type, operate the
indoor fan inter-
mittently during the
recovery operation.
• When CHECK code
"0b" occurs, the
outdoor units stop
and "STANDBY" is
displayed on the
remote controllers
of all the indoor
units.
11