Operational Description; P1 Auto Mode - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
7.0

Operational description

7.1

P1 AUTO mode

This is the standard operation mode for the domestic hot water heat pump.
The temperature is set from main menu, by pressing the 'OK' button.
Select 'A Temperatures' and then A1 AUTO to set temperature for auto mode, default set point is
53°C.
As long as the air inlet temperature, BT1, is within the specified temperature range, default -7 ~
+40°C then the DHW-HP will operate normally, if BT1 temperature is outside of its operating range
then the water will be heated using the electrical heater only.
Set Point
Code
Name
A1 T AUTO
The DHW-HP will then heat the water to set point using the heat pump only.
If the water temperature, BT3, reduces by 5°C then the DHW-HP will start to reheat the water
temperature back to set point.

80
Comp On
70
Comp Off
Fan On
60
Fan Off
50
40
30
20
10
0
 DHW-HP starts operation on selection of AUTO mode, T AUTO <SP -5k
 DHW-HP stops when BT3 = T AUTO SP (53.5°C factory setting)
 DHW-HP restarts when T AUTO = SP -5k
 DHW-HP stops when BT3 = T AUTO SP (53.5°C factory setting)
Description
The temperature level at which the DHW-HP
heats the water when AUTO mode is selected.
T1 T air in T3 T water top
HP_OnTemp HP_OffTemp
R3 Fan R4 Comp

15
Service Manual
Factory
Range
setting
50 ~ 60 53.5

