20
9.0 OPERATION AND INDICATORS
The
SUPPLY indicator (green) will remain illuminated all the time the supply is present to the boiler.
The
CALL indicator will illuminate (green) on demand from the programmer and thermostats or (red) for
an alarm overheat condition. It will flash (green) for 2 to 3 minutes during which it carries out self-tests, the
bottom heat indication can be seen to operate during this time. At the end of this period the call light will
remain on steady (green), until the heating demand is satisfied.
The HEAT
indicator will illuminate when the boiler actually produces
heat, when the CALL indicator (green) is illuminated. The gradual
build up in heating power of the boiler can be seen on the front panel.
The HEAT
indicator also shows the boiler modulating when it
reaches operating temperature, or if the temperature rise is too quick.
Alarm indication by either ALARM light or the CALL light illuminated
red flashing or steady depending on alarm sequence tripped. If there
is a problem see section 12 - Fault Finding. The
HEAT and the
CALL
(green) indicators will turn off. The boiler will remain in this tripped
state until it is re-set. To reset an ALARM follow the ‘Alarm Reset’
procedure. Section 13, page 22.
TEMPERATURE CONTROL. The boiler output temperature can
be adjusted from the front panel.(once set, will not need adjustment.)
Min setting for C series is approximately 65
0
C and U series 30
0
C.
Max setting for C series is approximately 80
0
C and U series is 60
0
C.
CLEANING
Use only a damp cloth and mild detergent to clean the boiler outer
casing. Do not use abrasive cleaners. Do not allow water inside
the boiler. Do not immerse in water.
10.0 SERVICING
IT IS ESSENTIAL THAT THE BOILER IS CHECKED ANNUALLY. Checks must include the electrical
connections and inhibitor concentration.
Before any servicing or maintenance is carried out on the system ensure that the electrical supply has been
disconnected first. Care must also be taken as the water may be scalding hot and at a high pressure.
Check the main electrical power connections are tight. Loose connections can cause a fire.
Part Locations and comments (see page 2)
Fuse FS1 is found near the top of the main power PCB assembly.
The temperature switch connected to Conn 3 is situated on the body of the boiler approximately 1/3rd of
the distance up from the bottom between insulation and boiler.
The thermistor assembly plugs into the main power PCB assembly through Conn 4 and is clamped at the top
of the boiler. Care must be taken not to break the fine wires.
The control PCB assembly is mounted on the back of the bottom front panel and plugged into the main
power PCB Conn 2. Great care must be taken when changing this board assembly not to damage any of the
components, especially those adjacent to the mountings.
To change the main power PCB follow ‘Replacing the Main Power PCB’ procedure (see page 20).
Each of the main electrical elements should have a resistance of approximately 19 ohms (29 ohms for 2kW
elements used in 4kW and 11kW boiler) terminal to terminal, (red to red, yellow to yellow, blue to blue and
black to black) and an insulation resistance greater than 2 Meg ohms between terminal and case. If the
elements are open circuit terminal to terminal, or have short circuit insulation resistance terminal to case,
then the boiler must be replaced.
FIGURE 15 : CONTROL PANEL
AMPTEC
