Domestic Hot Water Rotary Switch; Central Heating Rotary Switch - Bosch Worcester Greenstar HIU E Installation And Maintenance Instructions Manual

Commissioning
Left LED Right LED
(DHW) (CH) Description
Yellow Yellow HIU starting up
flashing flashing
No - DHW rotary switch position 0
(DHW function is turned off)
- No CH rotary switch position 0
(CH function is turned off)
Green - DHW rotary switch position
• 30, 35, 40, 45, 55 & 60
(DHW normal running at required set point)
- Green CH rotary switch position
•
(CH normal running at required set point)
Green - DHW rotary switch position
flashing
•
(DHW in pump service or calibration mode)
- Green CH rotary switch position
flashing
•
(CH in pump service or calibration mode)
Red - DHW rotary switch position is invalid
Flashing
(by-pass, DHW and circulation pump
functions are disabled)
- Red CH rotary switch position is invalid
Flashing
(CH function is disabled)
Table 9 Control unit operation indication
When an error occurs the LEDs indicate the particular error as shown in
the fault finding section ( 9.3).
The two rotary switches on the HIU module are divided into a CH and a
DHW parameter control.
They combine the following functionality:
• Define the appliance central heating hydraulic.
• Define the appliance central heating and domestic hot water set-
point temperatures.
• Calibrate control valve and allow service operation of the CH pump
and DHW circulation pump.
– When in calibration mode it will take approximately 5 seconds for
the control valve calibration to complete.
• Service operation of the central heating circulating pump.
• Switch off the appliance.
Both rotary switches can be set separately in order to activate or
deactivate CH or DHW functions.
The service functionality ( and
the control valves as well as running CH and circulation pumps to test all
actuator functionality. The following tables shows the position set point
values.
Control valve calibration
▶ The control valves do not require calibration at the
commissioning stage. Calibration should only be
necessary in the event of a control valve error
indication (Control valve fault indication,
section 9.4).
32
, 30, 35, 40, 50, 60, 70 & 80
&
&
) provides opening and closing of
The service function for both domestic hot water and central
heating combines two functions whilst the rotary switch is set to
position.
• Control valve calibration.
• After 10 seconds the control valve opens for 10 minutes for system
setup and testing purposes.
The control valve will close after the 10 minutes if left in the
position or the rotary switched is returned to a temperature set point
position.
6.4.2

Domestic hot water rotary switch

▶ Set the rotary switch to the set point for the approximate hot water
outlet temperature required.
Position Set point °C Function
00
30
35
40
45
50
55
60
Table 10 Domestic hot water rotary switch positions
Maximum domestic hot water temperature.
▶ A domestic hot water safety shut-off valve is provided
in order to interrupt the hot water flow to the tap in
the event of excessive hot water temperatures due to
a failure condition.
6.4.3

Central heating rotary switch

▶ Set the rotary switch to the set point for the approximate central
heating flow temperature required for the system.
Position Set point °C Function
00
30
35
40
50
66
70
80
Table 11 Central heating rotary switch positions
00 Hot water off
30 Hot water on
35 Hot water on
40 Hot water on
45 Hot water on
50 Hot water on
55 Hot water on
60 Hot water on
- -
0 Domestic hot water
circulation pump service
0 Hot water valve calibration
and test mode.
00 Central heating off
90 Network connected
• Direct units only
30 Network isolated/injection
35 Network isolated/injection
40 Network isolated/injection
50 Network isolated/injection
60 Network isolated/injection
70 Network isolated/injection
80 Network isolated/injection
0 Central heating circulation
pump service
0 Central heating valve
calibration and test mode.
6 720 808 928 (2017/06)