44
11
Outline of Control
Indoor Units
Item
Operation explanation and applied data, etc.
Remarks
6. Air volume
control
(1) By the command from the remote controller or the
central controller, “HIGH”, “MED.”, “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.
• During stop
operation, control to
prevent cold draft is
determined by TC2.
7. Freeze
prevention
control (Low
temp. release)
(1) In cooling operation, the air conditioner operates as
described below based upon temp. detected by TC1
and TC2 sensors.
• When “J” zone is detected for 2 minutes, the
command frequency becomes “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.
1) TC1
≥
10°C and TC2
≥
10°C
2) 30 minutes after the air conditioner has stopped.
8. Cooling
refrigerant/
Heating oil
recovery
control
When the indoor units stand by, thermostat is OFF, or
unit operates with “FAN” mode, PMV of the indoor unit
is opened by a certain degree when the cooling
oil/heating refrigerant recovery signal is received from
the outdoor unit.
• Only for 4-way/2-way
ceiling cassette type,
operate the indoor
fan intermittently
during the recovery
operation.
9. Short
intermittent
operation
compensation
control
(1) For 5 minutes after the operation has started, the
operation is continued even if entering thermostat-
OFF condition.
(2) However, if the thermostat has been turned off by
changing the setup temp., the thermostat is OFF
with even the above condition. The protective
control has priority.
10. Drain pump
control
(1) During “COOL” operation, the drain pump
operates.
(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.
• When CHECK code
“0b” occurs, the
outdoor units stop
and “STANDBY” is
displayed on the
remote controllers of
all the indoor units.
COOL
HIGH
MED.
LOW
+2
+1
Ts
HEAT
Ultra low
compressor
off
LOW
MED.
HIGH
+1
Ts
- 1
-2
a
K
I
J
P
(°C)
Q
TC1
TC2
P
5
-12
Q
-4
-15
Summary of Contents for MM-A0160HX
Page 1: ...Service Manual Air Conditioner Multi Split Type System Modular Multi System HFCR407C A90 0130 ...
Page 2: ......
Page 133: ...134 20 Additional Literature and Contacts ...
Page 134: ...135 20 Additional Literature and Contacts ...
Page 135: ...TOSHIBA AIR CONDITIONING www toshiba aircon co uk MADE IN UK A90 0130 Revised April 2001 ...
