Dimplex System 18 Installation And Servicing Instructions page 8

3 3 . . 0 0 B B O O I I L L E E R R O O P P E E R R A A T T I I O O N N
3 3 . . 1 1 C C E E N N T T R R A A L L H H E E A A T T I I N N G G
1. With a demand for heating, the pump, circulates water
through the primary circuit.
2. Once the main burner ignites the fan speed controls the gas
rate to maintain the heating temperature measured by the
temperature sensors.
3. When the demand is satisfied the burner is extinguished and
a 5 minute delay occurs before the burner will re-light (anti-
cycling), the pump continues to run for a period of 2 minutes
(Pump Overrun).
3 3 . . 2 2 F F R R O O S S T T P P R R O O T T E E C C T T I I O O N N M M O O D D E E
1. Providing there is mains power supply to the appliance, the frost
protection mode is integral.
If the system temperature falls below 5°C then the boiler will fire on
its minimum setting until a flow temperature of 20°C is reached.
Further protection can be incorporated by using a system frost
thermostat.
3 3 . . 3 3 P P U U M M P P P P R R O O T T E E C C T T I I O O N N
1. The pump will automatically operate for 1 minute in every 24 hours
to prevent sticking.
8 8
Expansion
Vessel
Burner &
Burner Flange
Automatic
Manual
Bleed Valve
Flue Products
CH flow
Thermistor
CH return
Thermistor
Primary Return
CH
Flow
Air
Pump &
Vent
Hydroblock
3 BAR
Pressure Relief
Valve
Pressure
Gauge
CH
Return
F F i i g g . . 3 3
Primary
Heat Exchanger
Condensate
Trap
© Dimplex Boilers 2008