Temperatures - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
Code Set point name
P1 AUTO
P2 ECO
P3 BOOST
P4 BACKUP
P5 SILENT
P6 HOLIDAY
Note: the unit can be turned off switching to HOLIDAY mode.

10.1.3 Temperatures

Set point
Code Description
name
The temperature level at which the unit heats the water when the AUTO
A1 T AUTO
mode is selected. The unit starts if the temperature of the water in BT3 falls
of 5 °C below the set point.
The temperature level at which the unit heats the water when the ECO mode
is selected. The unit starts if the temperature of the water in BT3 falls of 5 °C
A2 T ECO
below the set point.
The temperature level at which the unit heats the water when the BOOST
A3 T BOOST mode is selected. The unit starts if the temperature of the water in BT3 falls
of 5 °C below the set point.
Description
The heat pump heats the water when required, normally using the heat pump operation.
The unit starts when the water temperature BT3 is more than 5°C below A1 (T AUTO) and
it stops when this temperature is reached. If the air temperature is out of the feasible limits,
the water is heated with the electric heater.
The heat pump consumes as low energy as possible The heat pump has a lower water
temperature set point A2 (T ECO). The heat pump heats the water to a lower temperature
compared to the other operations.
The heat pump and the electrical heater operate simultaneously when possible. The unit
starts when the water temperature BT3 is more than 5 °C below A3 (T BOOST) and it
stops when this temperature is reached. If A3 (T BOOST) is higher than D33 (T HP max)
the compressor stops when the temperature D33 (T HP max) is reached. The remaining
temperature lift is accomplished with only the electric heater.
This is an emergency mode. When an error occurs, preventing the operation of the heat
pump, the water cannot be heated. On the display the possibility to activate the BACKUP
mode is asked to the user.
In BACKUP mode the water is heated up by the electric heater at a lower temperature
than the desired one.
The Legionella control is active in any case.
The unit starts when the water temperature BT3 is more than 5 °C below D13
(BACKUP T) and it stops when this temperature is reached.
The fan speed decreases to the minimum in order to minimize the sound emission of the
unit in operation. The unit starts when the water temperature BT3 is more than 5 °C below
BT1 (T AUTO) and it stops when this temperature is reached.
The heat pump is turned off and only the LCD display is active. The heat pump does not
start when water heating is required. The compressor is OFF except during LEGIONELLA
control in which it can be activated.
The HOLIDAY mode is connected to the Hot on time function B4 (Hot on time). After the
HOLIDAY period is completed, the unit goes back to the previous mode of operation.
52
Service Manual
Factory
Range
setting
50 - 60 53
50 - 55 50
50 - 65 55