Worcester Greenstar Heatslave II External 12/18

Appliance automatic frost
protection ( monitors
PHE, flow and internal
tank sensors)
PHE OR Flow
sensor below
8°C
Tank will scavenge
heat after any burn to
heat tank to 10°C
3WV to CH
Pump
ON
PHE OR Flow
sensor below
9°C
Pump OFF
after 5
minutes
3WV to
DHW
Waiting period
of 25 ninutes
PHE AND
Flow sensor
above 9°C
Pump OFF
(min run time
1minute)
PHE OR Flow
sensor below
4.5°C
3WV to CH
Pump ON
Burner ON
PHE sensor
above 15°C,
Burner OFF
Pump OFF
after 3
minutes
Internal tank
sensor 8°C
or less
3WV to
DHW
Pump ON
Burner ON
Tank sensor
above 10°C,
Burner OFF
Pump OFF
after 4
minutes
Internal tank
sensor 5°C
or less
3WV to
DHW
External 230V frost
thermostat/s ON, (wired
between FR & FS)
3WV to CH
Pump ON
for 5
minutes
3WV to
DHW
Waiting period
of 25 ninutes
Normal
operation
Pump has
not run for
24 hours
Pump run
for 10
seconds
Normal
operation
3WV has
not moved
for 24 hours
When
pump is
OFF
3WV
operated
twice
NB: During system frost protection the external frost stat only activates circulation of the water to protect the vulnerable pipework, the burner will be
activated if either internal sensor temperature drops below 4.5°C.
The cause code will be 203 and the blue light will be OFF during all frost protection functions.
Key:
PHE Primary heat exchanger.
3WV 3 way valve (diverter valve).
FS Appliance connection frost stat supply (230V)
FR Appliance connection frost stat return (230V)
FAULT FINDING & DIAGNOSIS
PROTECTION FUNCTIONS
FAULT FINDING & DIAGNOSIS
PROTECTION FUNCTIONS
INSTALLATION & SERVICING INSTRUCTIONS FOR GREENSTAR HEATSLAVE II EXTERNAL 12/18-18/25-25/32 6 720 805 210-01
59
Appliance:
System:
Component antiseize functions:
Normal
operation
Any CUS
lockout - Blue
light flashing
Mains
power loss
Mains
power
restored
F0 263
lockout - Blue
light flashing
Press reset
button
IF the original lockout
was due to a burner
lockout (9F, 555) then
the CUS will initialise
and lockout again
9F 555
lockout - Blue
light flashing
Press reset
button
FAU LT FI NDI NG
& DIAGNOSIS
Power interruption during lockout
Frost Protection
Frost Protection