Benchmark Procombi Exclusive 24 Installation & Servicing Instructions Manual page 32

28 INITIAL LIGHTING
Legend
A. Mode Control Knob
B. DHW/Preheat Control
C. CH Control
D. Boiler Status
E. Burner 'on' Indication
F. Pre Heat on/off Indication
G. CH Flow Isolating Valve
H. Pressure Gauge
J. Gas Inlet Pressure Test Point
K. Gas Service Cock
L. DHW Inlet valve
M. CH Return Isolating Valve
N. DHW Outlet
1. Check that the system has been filled to the required pressure and that
the boiler is not airlocked. Ensure the automatic air vent cap is open.
Note.
It is important the burner is not operated before the system is fully
vented of air. If it is necessary to operate the appliance pump to assist
venting of the air this must be done with the gas service cock turned off.
2. Refit the boiler upper and lower front panels. Refer to Frame 33.
3. Check that the drain cock is closed and that the CH and DHW isolating
valves (M, L and G) are OPEN.
4. Check that the electrical supply is OFF.
5. Check that the boiler mode control knob (A) is off.
6. Check that the gas service cock (K) is OPEN.
7. Slacken the screw in the inlet pressure test point (J) and connect a
gas pressure gauge via a flexible tube.
8. Switch electricity supply ON & check mechanical timer is in "Permanently
On" position.
CENTRAL HEATING
9. Set the CH temp control (C) to max and turn the mode control knob (A) to
. The boiler control should now go through its ignition sequence until
the burner is established.
10. If the boiler does not light code
the boiler will lock out and display fault code
boiler (Refer to Frame 30). The boiler will repeat its ignition sequence. If
reset occurs 5 times within 15 minutes then
removed this will be reset.
When the burner is established the BLUE 'Burner On' neon (E) will be
illuminated, the LED display (D) will show status .
DOMESTIC HOT WATER
11. With the boiler firing, set the DHW Temp Control knob (B) to maximum
and fully open a DHW tap.
The boiler should continue to run and the LED display (D) should show
status
12. Ensure that with the boiler operating the dynamic gas pressure is able to
obtain maximum output. Refer to Table 2.
IMPORTANT - The gas input to the burner is regulated by the gas valve
according to the air flow produced by the fan. It is NOT user-adjustable.
Any interference to sealed settings on the gas valve will adversely
affect operation and render our warranty void.
For additional gas supply info refer to "Gas Supply" on page 10.
13. Turn off the DHW tap.
14. To turn on the DHW pre heat facility, turn the DHW knob (B) fully
clockwise and then back to the desired setting, a decimal point will appear in
the boiler status window (F) indicating pre heat 'ON'.
15. To turn off the pre heat facility, turn the DHW knob (B) fully clockwise and
then back to the desired setting, the decimal point will disappear in the boiler
status window (F) indicating pre heat 'OFF'.
32
INSTALLATION
off
A
H
Black
Handle
3G9928
will be displayed. After 5 attempts
constantly. Reset the
will be shown. If power is
30
max
reset min preheat min
mode
B C
G
N
Yellow
Handle
K
J
MECHANICAL TIMER
Permanently OFF
THE DISPLAY
The user control has one neon and one display to
inform the user about the status. The display will
show the status of the boiler. The neon will show
the status of the flame. If no flame is detected the
neon is off. When the flame is detected the neon
will be lit permanently.
Below is a list with display function in normal
operation.
Standby, no demand for heat present.
Boiler is active for central heating.
Boiler is active for domestic hot water.
Boiler is heating up the plate heat exchanger.
Boiler is active for boiler frost protection.
Boiler is in lockout for a specific error. Display
will be blinking, alternating with a number or
letter to show which error is detected.
Boiler has a fault for a specific error. Display
will be blinking, alternating with a number or
letter to show which error is detected.
Note: Boiler frost protection - boiler fires if
temperature is below 5 degrees C.
Note. The boiler incorporates a fan overrun cycle
which MUST NOT be prematurely interrupted by
isolation of the mains electricity supply.
Procombi Exclusive -
E
status burner
e
max
preheat
D
F
Exclusive
L
M
Safety
Blue
Drain
Handle
Valve
Black
Handle
Timer Control Permanently ON
Installation and Servicing