Operational Flow Diagrams - Worcester Highflow 400 RSF Installation And Servicing Instructions

Note: The alpha references in these charts are to be used for cross-referencing when fault finding. See Section 17.
Standby
Indicator
On
Hot Water
Heatbank
NORMAL
Select
Overheat
Switch
Stat
TRIPPED
OFF
All
Functions
Stopped
AUTOMATIC START-UP SEQUENCE
Air Pressure
Switch Test
FAIL
Wait
(Pump On)
Frost
Thermostat
Standby
Indicator
On
Heatbank Heating
Overheat Select
NORMAL
Stat Switch
TRIPPED
All
Functions
Stopped

16. Operational Flow Diagrams

Domestic Hot Water Operational Flow Diagram
Hot Water Hot Water
ON ON
Control High Limit
Stat Stat
OFF
Stop
Burner
Demand
Indicator
Flow
ON
Switch
PRESENT
B
Fan Sense Air
On Pressure
PASS
NOT
PRESENT
Wait
(Pump &
Fan On)
Central Heating Operational Flow Diagram
(HW Selected Off and Water Flow Switch off)
ON
ON DEMAND
Room
Thermostat
(CH Selected Off)
Burner
Heat
NORMAL
Demand
(High Gas
Pressure)
TRIPPED
A
H
Pump on.
On
Continues
5 minutes
after
Demand Off
I
Initiate Sparking Stop Sparking
C
Pilot Valve Sense
Opens Flame
D
Wait
(Pump &
Fan On)
Demand
J
Indicator
On
Heating
ON
Control
Stat
Pump On.
Continues 5
K
minutes after
demand off
Diverter
N
Valve
On
49
Safety
Limit
Stat
Ignition
G
Sequence
Stopped
PRESENT
Main Gas
Valve Opens
E
NOT
PRESENT
Burner
Heat Safety
Demand Limit
(Low Gas Stat
Pressure)
Ignition
Sequence
Stopped
Automatic
Start-up
NORMAL
Sequence
TRIPPED
High/Low
F
Gas Valve
On
Automatic
NORMAL
L
Start-up
Sequence
TRIPPED
Minimum
M
Burner
Pressure