Operating Modes; Using The Boiler - Alpha InTec 50CS Installation, User And Servicing Instructions

2.4 OPERATING MOdES.

Below is a list of boiler operating modes
that appear on the status display (item 6 in
Fig. 2-1) together with a brief description.
display (item 6) description of operating mode
Summer operating mode without request in progress.
SUMMER
Boiler in stand-by for domestic hot water request.
Winter operating mode without request in progress.
WINTER
Boiler in stand-by for domestic hot water or central heating request.
Domestic hot water mode in progress.
dHW ON
Boiler operating, domestic hot water heating in progress.
Central heating mode in progress.
CH ON
Boiler operating, central heating in progress.
Anti-freeze mode in progress.
F3
Boiler operating to restore the minimum safety temperature against boiler freezing.
With domestic hot water priority disabled (item 15 sysmbol off), the boiler only operates
in central heating mode for 1 hour, however keeping the domestic hot water store at
dHW OFF
minimum temperature (20°C), after which the boiler goes back to the normal operation,
previously set.
Post ventilation in progress.
F4 Fan in function after a request for domestic hot water or central heating in order to
evacuate residual fumes.
Post circulation in progress.
F5
Pump operating after a request for domestic hot water or central heating in order to cool
the primary circuit.
The optional environment thermostat (TA) not working, the boiler functions all the time
P33
in central heating mode. (Can be activated through the 'Customisation' menu. It allows
activation of the central heating even if the TA is out of order).
Reset attempts finished.
STOP Wait for 1 hour to re-acquire 1 attempt.
(See Ignition failure on following page).
Fault present with relative error code.
ERR xx
The boiler does not work. (see Section 2.6, fault signals).
During rotation of the domestic hot water temperature selector switch (item 1 Fig. 2-1)
SET
the adjustment status of the domestic hot water temperature is displayed.
During rotation of the central heating selector switch (item 3 Fig. 2-1) the adjustment
SET
status of the boiler flow temperature for central heating is displayed.
In presence of the external probe (optional) replace the 'SET' item.
The value that appears is the correction of the flow temperature with respect to the
SET
functioning curve set by the external probe. See OFFSET on external probe graphics (Fig.
1-4).
System deaeration in progress.
F8 During this phase, which lasts 18 hours, the boiler pump is started at pre-established
intervals, thus allowing deaeration of the central heating system.

2.5 USING THE BOILER.

Refer to Fig. 2-1.
Before lighting make sure the central heating
system is filled with water and that the pressure
gauge (item 23) indicates a pressure of 1 - 1.2 bar;
Open the gas cock upstream from the boiler.
With the boiler off, only the stand-by symbol
(item 10) appears on the display. By pressing the
( ) button the boiler switches on.
Once the boiler is on, by pressing button 'A'
repeatedly, the operating mode changes and
passes alternatively from summer (
winter ( ) operating modes.
• Summer ( ): in this mode the boiler
operates only to provide domestic hot water.
The temperature is set using the selector
switch (item 1) and the relative temperature
(item 2) is indicated on the display and the
'SET' indication appears (Fig. 2-2). By turning
the selector switch (item 1) in a clockwise
direction the temperature increases and in an
anti-clockwise direction it decreases.
Set domestic hot water temperature
1 A
) and
2
°C
SET DHW
ESC
C
17
During the heating of the domestic hot water
'DHW ON' appears on the status display
(item 6) and at the same time as the burner
lights the flame presence display switches on
(item 8) together with the output scale next
to it. The displays (items 7 and 9) indicate the
instantaneous outlet temperature from the
primary heat exchanger. As shown in Fig. 2-3.
Summer operating mode with domestic hot
• Winter ( ): in this mode the boiler operates
to provide both domestic hot water and central
heating. The temperature of the domestic hot
water is always adjusted using the selector
switch (item 1), the central heating temperature
is adjusted using the selector switch (item 3)
and the relative temperature is indicated on the
display (item 4) and the 'SET' appears on the
status display (item 6). As shown in Fig. 2-4.
By turning the selector switch (item 3) in a
clockwise direction the temperature increases
and in an anti-clockwise direction it decreases.
Set the central heating flow temperature
During the request for central heating 'CH ON'
appears on the status display (item 6) and at the
same time as burner lights the flame presence
display switches on (item 8) together with the
output scale next to it. The displays (items
7 and 9) indicate the instantaneous outlet
temperature from the primary heat exchanger.
As shown in Fig. 2-5.
Winter operating mode with domestic hot
B
In the central heating mode, if the temperature
of the water contained in the system is sufficient
to heat the radiators, the burner will shut off
and only the pump will operate.
D
6
Fig. 2-2
water only
12 8
1
A B
2
°C
°C
DHW ON MENU
C D 9
7 6
Fig. 2-3
A B
3
°C
SET
4
ESC
C D
6
Fig. 2-4
water and central heating
8 14
1 3
A
B
2
°C °C
°C
CH ON MENU
4
C D
9
7 6
Fig. 2-5
Alpha Intec 50CS