Intergas Heating Ltd
11
4
OPERATION
4.1
General
The Intergas Compact HRE OV wall mounted, gas fired open vent boiler is a
modulating high efficiency boiler. This means that the power is adjusted in line with the
desired heat requirement. It is designed to be used in an open vented system with
heating system feed tank.
The appliance is equipped with an electronic boiler controller which, each time heat is
requested from the heating supply, starts the fan, opens the gas valve, ignites the
burner and continuously monitors and controls the flame, depending on the requested
output.
4.2
Central heating mode
When a heating demand is requested (power is on, the timer and thermostat are calling for
heat) the external pump is energised and the boiler will fire automatically. The hot water is
now circulated around the central heating system. When the end of the central heating
demand is reached (the thermostat reaches temperature or the time clock reaches the end
of its set period) the burner will shut down while the pump remains functioning during a
preset period of time to dissipate any excess heat from within the boiler’s heat-exchanger.
After that the boiler will revert to stand-by, waiting to respond to the next heating demand.
4.3
Operating modes
A code on the service display of the operating panel indicates the appliance’s operating
mode.
-
Off
The appliance is out of operation but is supplied with electrical power. No response
occurs to calls for DHW or CH. The appliance frost protection is active. This means that
the external pump operates and the exchanger is heated up if the temperature of the
water present in it falls too far.
If the frost protection is actuated, code
7
is displayed (heating the exchanger).
In this operating mode the pressure in the CH installation (in Bar) can also be read on
the temperature display.
Waiting mode
The LED at the
button is lit and possibly one of the LEDs for the DHW comfort
function. The appliance is ready to respond to a request for CH of DHW.
0
Pump overrun of CH
After the end of CH operation the external pump continues to run. The running time is
factory set at the value in accordance with § 10.3. This setting can be changed.
In addition, the pump runs automatically for 10 seconds once every 24 hours in order to
prevent seizing. This automatic switching on of the pump occurs at the time of the last call
for heat. To change the time, the room thermostat setting should be increased briefly at the
desired time.
1
Boiler shutdown when required temperature reached
The boiler controller can temporarily shut down the request for heat. The burner is then
stopped. Shutdown occurs because the requested temperature has been reached.
When the temperature has fallen sufficiently and the anti cycle time has passed the
shutdown is cancelled.
2
Self-test
The connected sensors are checked regularly by the boiler controller. During the check
the boiler controller does not perform any other tasks.
3
Ventilation
When the appliance is started the fan is first brought to starting speed. When the
starting speed has been reached the burner is lit. Code
3
is also visible when post-
ventilation is taking place after the burner has stopped.
