Protection Function - Worcester Greenstar i System ErP Series Installation, Commissioning And Servicing Instructions

Fault finding and diagnosis
8.5

Protection function

AUTOMATIC INTERNAL FROST PROTECTION
Appliance automatic
frost function
(monitors internal boiler
primary temperature)
PUMP OVERRUN FUCTION CH
End of appliance demand
(central heating)
PUMP OVERRUN LOCKING ERROR
Locking error
Optional integral diverter valve kit only
PUMP ANTISEIZE FUCTION
No central heating
demand after
a 24hr period
Fig. 99 Protection function
74
Diverter valve returns
to DHW position (up)
for DHW priority
Internal appliance
temperature
between
8ºC & 5ºC
Internal appliance
temperature
below 5ºC
Diverter valve returns
to DHW position (up)
for DHW priority
Pump runs for 3 minute
to dissipate heat from
the appliance into the
system
Pump runs for 5 minutes
(if internal valve kit is
not fitted)
Pump runs 10 seconds
every 24hrs from
last time pump ran
Optional integral diverter valve kit only
Diverter valve
Internal boiler
in CH position
temperature
(down)
rises above 9ºC
Pump ON
Not above 9ºC
after 30 minutes
Internal appliance
Central heating
temperature
demand is activated
rises above 12ºC
Optional integral diverter valve kit only
Optional integral diverter valve kit only
Diverter valve in CH
position (down). Pump
runs for 5 minutes
Pump switches off
after a 3 minute
overrun period
Central heating
demand switches
off
Pump switches off
after a 3 minute
overrun period
Diverter valve returns
to DHW position (up)
for DHW priority
Once locking error is resolved
diverter valve returns to DHW
position (up) for DHW priority
6720806945-32.1Wo
Greenstar i System - 6 720 806 945 (2015/07)
ErP