Bosch Appliances 24I RSF manual Domestic Hot Water Mode

2. Domestic Hot Water Mode

			Wait for hot water
Signal from the			temperature to
			drop to factory
flow switch
			pre-set level
HOT WATER	Inhibit operations	Domestic hot water	Is the central
	for approximately	temperature	heating mode
DEMAND	1 second. 6 second	monitored by hot	interrupted?
(Overrides all other	delay before re-	water sensor
overrun modes	ignition from any
and functions)
	other demand.
			Pump OFF

Gas valve OFF.

Fan remains ON

AUTOMATIC

START-UP

SEQUENCE

Hot water	Operating
temperature above	Switch (or
70¡C	programmer
	OFF)
Modulate heat	HOT WATER	Gas valve OFF
input to maintain
	DEMAND
hot water
	SATISFIED
temperature at the
factory pre-set		Pump pulse 6
level
		seconds then 2
		minutes later
		2nd pulse

25

3. "Autofrostat" Function

No demand and

primary

temperature below 6¡C monitored by the central heating sensor

Internal	Run pump
"Autofrostat"
Demand

Commence normal central heating mode until heating temperature reaches 20¡C

Below 4¡C

Above 8¡C

Monitor central heating sensor

4¡C to 8¡C

Return to normal

OFF state

	Fan overrun
	4 minutes
4. Pump Overrun Function
No demand and central	Pump on until
heating temperature above
50¡C monitored by the	primary temperature
central heating sensor	drops to 50¡C
End of hot water demand	6 second pump pulse with a
with no central heating
demand. Hot water	2nd 6 second pump pulse 2
thermistor above 40¡C	minutes later.

6. Central Heating ramp control

		6		5. Fan Overrun Function
Burner pressure	Burner pressure adjusted	Burner never to be	At the set point	End of demand or central	Fan on for
at 1.0 mbar	based on the temperature	extinguished	change to a wide	heating temperature above
	rise over the previous	irrespective of the	band proportional	70¡C monitored by the	4 minutes
	minute. Aiming at 4¡C	rate of temperature	control	central heating sensor
	rise/minute.	rise