Toshiba HWS-G2601ENXR-E - B5 Photovoltaic

Domestic Hot Water Heat Pump Service Manual
22
Single Speed Operation 2 Speed Operation
7.10 B5 Photovoltaic
The domestic hot water heat pump (DHWHP) can be controlled by a signal from a solar
photovoltaic (PV) converter or an energy meter, either as simple start/stop via a potential free
contact or by a variable signal.
The diagrams below represent possible installation configurations with or without energy meter.
Using the variable signal option, a certain output (VDC or mA) from the (PV) inverter or the
energy meter corresponds to a given amount of excess power for use in the DHWHP. This
excess power can be used to activate either the electrical immersion heater, the heat pump (HP)
or both.
PV installation 1: control signal from inverter. PV installation 2: control signal from energy meter.
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T3:Temperature Tank Top
DHW AUTO mode set point of 53°C
Ventilation ON
Ventilation fan speed LOW
Ventilation mode single speed
Note: This may have an impact on performance due to fan reduction in DHW mode
Temperature °C
Fan
Auto
Low
53
50
48
12
T3:Temperature Tank Top
DHW AUTO mode set point of 53°C
Ventilation ON
Ventilation fan speed LOW
Ventilation mode 2 speed
Auto
48
12
Low
Fan
Temperature °C
53
50
TB1: DC/AC Inverter
BU: Energy meter
E1-2-3: Electric loads
WG1: Heat pump
power supply
GC1: Photovoltaic
function input
signal (0-10
VDC 0-3 VDC,
4-20 mA).