Solar Compatibility - Bosch WORCESTER Greenstar Heatslave II External 12/18 Installation, Commissioning And Servicing Instructions

Power interruption during lockout
Normal
operation
Fig. 102
8.8

Solar compatibility

During a DHW demand
(DHW flow >2 l/min
Fig. 103
[1] Normal operation: the tank will cool more slowly for the same DHW performance if the DCW is above normal DCW temperature, thus saving fuel.
[2] Solar tank hot: therefore the burner will not be required at high DHW flow rate and the tank will boost the solar heated water if the temperature
drops.
[3] Solar tank will satisfy the DHW requirements: therefore the appliance allows the water to pass straight through without taking any action apart
from monitoring the temperatures. To utilise the solar panels to their maximum potential, the solar tank thermostat will need to be set high and
the Heatslave II DHW setting low.
[4] Solar tank overheat: DCW above solar tank limit, appliance will not operate pump or burner and fault code will be displayed within the service
menu.
Greenstar Heatslave II External 2022+ - 6 721 843 980 (2022/01)
Any CUS
Mains
lockout - Blue
power loss
light flashing
Press reset
button
1
DCW in less than
40°C
2
DCW in more than
40°C (but less
than 3 below)
(for 2 sec or more)
3
DCW in greater than tank setpoint
minus (no demands offset + 2°C )
(for 2 seconds or more)
4
DCW in 80°C or
more (for 2
seconds or more)
Mains F0 263
power lockout - Blue
restored light flashing
9F 855
lockout - Blue
light flashing
Key
PHE Primary heat exchanger.
3WV 3 way valve (diverter valve).
FS Appliance connection frost stat supply (230 V)
FR Appliance connection frost stat return (230 V)
Normal DHW
operation
Burner OFF for
DHW 10 l/min &
above (burn
allowed for tank
reheat during
demand)
Burner OFF, pump OFF
(any tank reheat demand
suppressed until after
DHW demand ends)
Burner OFF, pump OFF
Fault code 380 displayed
within service menu (i1)
Fault finding and diagnosis
Press reset
button
IF the original lockout
was due to a burner
lockout (9F, 855) then
the CUS will initialise
and lockout again
DCW in less than tank
setpoint minus (no
demands offset + 3°C)
DCW in below
79°C (for 2 sec
or more)
6 720 805 209-74.1TL
53