Zanussi ULTRA COMBI 35 Installation And Servicing page 35

32 INITIAL LIGHTING
Legend
A. Domestic Hot Water Preheat On/Off Knob
B. Domestic Hot Water Temperature Knob
C. Central Heating Temperature Knob
D. Mode Knob
E. Boiler Status
F. Burner 'on' Indicator
H. Central Heating Economy Setting
J. CH Flow Isolating Valve
K. System Pressure Gauge
L. Gas Inlet Pressure Test Point
M. Gas Service Cock
N. DHW Inlet Valve
O. CH Return Isolating Valve
P. DHW Outlet
Q. Filling Loop Valve
1. Check that the system has been filled 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 front panel. Refer to Frame 37.
3. Check that the drain cock is closed and that the CH and DHW
isolating valves (N, O, and J) are OPEN.
4. Check that the electrical supply is OFF.
5. Check that the boiler mode knob (D) is off.
6. Check that the gas service cock (M) is OPEN.
7. Slacken the screw in the inlet pressure test point (L) and connect
a gas pressure gauge via a flexible tube.
8. Switch the electricity supply ON and check all external controls are
calling for heat.
CENTRAL HEATING
9. Set the CH temp control (C) to max and turn the mode knob (D) to
' '. The boiler control should now go through its ignition sequence
until the burner is established.
10. If the boiler does not light code
attempts the boiler will lock out and display fault code
Restart the boiler (Refer to Frame 34). The boiler will repeat its
ignition sequence. If restart occurs 5 times within 15 minutes then
will be shown. If power is removed this will be restarted.
When the burner is established the BLUE 'Burner On' neon (F) will
be illuminated, the LED display (E) will show status .
DOMESTIC HOT WATER
11. With the boiler firing, set the DHW Temp Knob (B) to maximum
and fully open a DHW tap.
The boiler should continue to run and the LED display (E) should
show status
12. Ensure that with the boiler operating the dynamic gas pressure is
able to obtain maximum output. Refer to Table 2.
Installation and Servicing
INSTALLATION
A B
CH Flow
J
K
will be displayed. After 5
constantly.
E F C
DHW
Outlet
Gas
Supply
DHW
Inlet
Q
N
L
Filling
Loop
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 information refer to "Gas Supply" on
page 10.
13. Turn off the DHW tap.
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.
H D
N
CH
Return O
Q
35