Toshiba MMW-AP0481CHQ-E Service Manual page 19

No. Item
6 Water As the following description, the pump and the line heater are controlled based on the
Heat exchanger detected temperature of TC1 sensor, TCJ sensor, TC2 (TWO) sensor, TE sensor, TD
frost prevention sensor and TA (TWI) sensor, regardless of Start/Stop operation.
(Even when remote controller is OFF)
1) Pump ON condition
(1) TD < 5˚C 30 seconds or more or TE < 5˚C 30 seconds or more
(2) TE ≥ 2˚C & TWI or TWO < 6˚C
(3) TE > 2˚C & TWI or TWO < 8˚C
2) Pump OFF condition
(1) TWI or TWO > 9˚C & TE and TD ≥ 12˚C 60 seconds or more
(2) After 20 minutes has passed since pump ON
3) Heater ON condition
(1) When 65 seconds progressed after the pump was ON, TA (TWI) or TC2 (TWO)
4) Heater OFF condition
The state TA (TWI) or TC2 (TWO) ≥ 15˚C continued for 2 minutes or more.
7 Refrigerant (oil) While the outdoor unit is recovering refrigerant (oil), the High temperature HWM perform
recovery control the following control tasks:
[ Heating thermostat ON / thermostat OFF unit]
1) Continue operating
[ Non-operational unit ]
1) Open the PMV1(R410A side) to a certain degree.
2) Operate the water pump
3) Engage in recovery control for a specified period of time
8 Heating refrigerant While the outdoor unit is recovering heating refrigerant (oil), the indoor units perform
(oil) the following control tasks:
recovery control 1) Open the PMV1(R410A side) to a certain degree.
2) Terminate the recovery operation depending on the TC2 (TWO) temperature reading.
The timing of termination is determined by each High temperature HWM unit.
9 Defrosting control While the outdoor unit is engaged in defrosting control, the High temperature HWM
perform the following control tasks:
1) Stop compressor operation
2) Open the PMV1 to a certain degree.
3) Operate the water pump
4) As defrosting control comes to an end, it gives way to heating refrigerant (oil)
recovery control.
(For control details, see "8. Heating refrigerant (oil) recovery control" above.)
10 Short intermittent 1. For 5 to 10 minutes* after startup, the system is forced to continue operating even if
operation it reaches the thermostat OFF region.
compensation 2. However, priority is given to cooling/heating selection, operation standby, and
control protective control, so that there is no overriding of thermostat OFF in these cases.
11 Operation <Operation standby> .......... Displayed on remote controller
standby 1. When any of the check codes listed below is displayed
Heating standby • "P05" - Detection of an open phase in the power supply wiring
• "P10" - Detection of indoor flooding in at least one indoor unit with the exception of
• "L30" - Detection of an interlock alarm in at least one indoor unit
2. The system is engaged in a heating refrigerant (oil) recovery control.
<Heating standby> .......... Displayed on remote controller
1. Normal thermostat OFF
• During heating, the indoor unit goes thermostat OFF as the heating temperature
2. Forced thermostat OFF
• "HEAT" operation is unavailable because at least one indoor unit is operating in
(1) or (2) or (3)
decreased below 15˚C
the hot water module.
setting is reached.
"COOL / DRY" mode .
Specifications
– 19 –
Remarks
TC1: Gas Temperature
TCJ: Liquid
Temperature
TC2 (TWO):
Water outlet
Temperature
• Recovery operation
normally takes place
roughly every 2
hours.
• Recovery operation
normally takes place
roughly every hour.
* Depend on outdoor
ambient: TO.
TO ≥ 0˚C : 5min
TO ≤ -20˚C :10min
• "OPERATION
STANDBY "
displayed
• "HEATING
STANDBY "
displayed