G O M - 영 문
75
Working Mode
y
When the DHW flows, the DHW flow switch close the contact and the DHW
Production mode begins.
y
The pump switch on (if it was off), the fan is energized and, after checking the
primary circuit water flow and the air flow by the air pressure switch, the burner
control is enabled.
y
Passed the
“
ignition burn capacity timing
”
from the flame detection the flame
modulation phase begins with a proper action until the achievement of the DHW set
point temperature.
y
DHW Production Mode ends when the DHW flow stops.
y
During the DHW phase two thermostat check the temperatures sensed by the DHW
and the CH probes.
y
If the temperature exceeds the respective switch off points, the burner is stopped
and the fan continues to run up the post purge time.
y
The burner starts again when the temperature falls under the respective switch on points.
y
After the end of the DHW demand, the pump stops and the fan continues to run till
the post purge timing ends.
y
DHW Production Mode has the priority over heating mode in case of concurrent
requests.
y
During DHW Production Mode the 3 way valve relay is switched off.
y
The CH Mode phase begins when the heating demand comes from the room
thermostat; under the condition the boiler is set in
“
winter
”
condition.
y
If the room thermostat is not connected the CH mode phase begins a soon as the
boiler is set in
“
winter
”
condition.
y
The 3 way valve relay is switched on(CH position), the circulator and the fan are energized
and, after checking the air pressure switch, the burner control working is enabled.
y
Passed the
“
ignition burn capacity timing
”
from the flame detection, the capacity rise
to the maximum with a ramp of 50 seconds maximum.
y
If the flame modulation point is reached the rising rump is stopped and the control
passes to the modulating mode to achieve the central heating set point.
y
In case of the temperature exceed the
“
switch off temperature in CH mode
”
the
burner switch off and the anti fast cycling timer is loaded.
y
The burner restart when the primary temperature falls under the
“
switch on
temperature in CH mode
”
and if the anti fast cycling time is finished.
y
The anti fast cycling timing finished also in case of opening and closing of the
room thermostat or in case of DHW demand.
y
By the opening of the room thermostat contacts or if the working mode is changed
to
“
summer
”
condition, the CH phase ends and the pump continues to work for the
“
CH overrun time
”
.
y
After passing the CH overrun time the 3 way valve is moved in DHW position.
Domestic Hot Water (DHW) Production
13
Central Heating (CH) Mode
