Carrier 50FC Installation, Operation And Maintenance Instructions page 47

12 - FACTORY OPTIONS AND ACCESSORIES
- First level menu:
The following menus are present on the fi rst level:
machine status gives information about the operation of the
PCH (ex. rdy, ON, etc.);
FUN from FUN it is possible to select the function ON, OFF
or EST (do not select EST);
REG this menu allows the user to force the burner to
the minimum or the maximum for combustion tests; it
automatically returns to the previous position at the end of
the preset time (10 minutes);
TIN allows the user to read the value of the 0/10 Vdc signal
coming into the PCH;
Pra not used;
ABI used to enter the PWD to access menus of second and
third level.
Entering the password 001 will provide access to the second
level and make the Set Point and I/O menus available.
Entering the second password grants access to third level.
This password must be requested directly to "CARRIER
Technical Service".
■ Reset:
The modulation PCB allows the operator to identify more
than thirty diff erent causes of faults. This makes it possible to
manage each event very precisely.
To reset the faults, press both arrows simultaneously for a
few seconds.
If ignition fails, the fl ame monitoring system reattempts ignition
four times. After four failed attempts, it will block and display
the code F10.
The faults code and cause of the faults is shown in the FAULT
table in next Paragraph.
If the fl ame monitoring equipment is blocked (codes from F10
to F20), it is also possible to unblock it by using the button on
the equipment itself. This block is shown by a LED that lights
up on the equipment.
Warning: The fl ame monitoring equipment memorises the
number of manual resets that are performed during its lifetime.
In case of fi ve resets performed in a period of 15 minutes,
without a fl ame being ignited and detected, the equipment
will go into a "timed" lockout (F13). In this case, it is required
to wait another 15 minutes before resetting again. Press the
reset button on the equipment to immediately reset this block
condition.
Note: should the safety thermostat (STB) be open before
starting the start-up cycle (this could be caused, for example,
by low temperatures), the pilot light equipment will be kept in
"standby" and block F15 will be shown.
■ Analysis of Blocks - Faults
The CPU-SMART manages two types of blocks:
- preventive, it warns the client that the PCH heater requires
maintenance;
- operational, it stops the PCH heater for safety reasons or to
ensure its correct operation.
Some operational blocks require manual resets; others reset
themselves when the problem that caused them is solved.
Below is a complete list of faults, possible causes and possible
remedies.
Fault Description
Blocks caused by Flame - Dependent on the TER equipment
Failure to ignite fl ame
after 4 attempts
F10
performed by the
equipment
F11 Ill-timed fl ame
Failure of ignition; not
visible.
The count, displayed
F12 in the historical list,
indicates whether the
heater has had problems
with ignition
The TER equipment
doesn't accept the reset
F13
command from CPU-
SMART
Lack of communication
between TER equipment
F14
and CPU for more than
60s
The CPU-SMART PCB
sent the ignition signal to
F15 the equipment. After 300
seconds, the equipment
has not yet lit the fl ame
F16 Generic equipment block
Internal malfunction of
TER equipment that
F17 does not accept reset
command from CPU-
SMART
Blocks caused by temperature (safety blocks)
Activation of safety
F20
thermostat STB
Block FAN - burner ventilator
Fan speed too low in start
F30
up phase - VAG
Fan speed too high in
F31
start up phase - VAG
Fan speed, during
operation, outside
F32
minimum and maximum
set parameters - VAG
NTC probes broken or missing
Probe NTC1 error, air
F41
intake temperature
Over-temperature
The temperature of the air
F51
intake probe NTC1>TH1
Lack of voltage
No voltage during
operation cycle (excluding
F75 stand-by); the fault is not
visible on remote control
but only counted.
Internal malfunction of CPU-SMART PCB
Internal malfunction of
F00
CPU-SMART PCB
Cause Remedy
• Phase and neutral
reversed.
• Earth wire not
connected.
• Phase-phase
connection without
neutral.
• Start-up electrode
failed or badly positioned Manual reset
• Detection electrode
failed or badly positioned
• Detection electrode
that moves or disperses
to the
earthing system when
hot.
• Low CO2 value
Wait 15 min.
TER has fi nished its 5
or use reset
reset attempts in the
button on
period of 15 minutes.
equipment
TER equipment or CPU-
Auto-reset
SMART PCB broken
safety thermostat Check contact
blocking start up closing
TER equipment broken Manual reset
TER equipment broken Manual reset
Manual reset
TER equipment broken
of equipment
• Excess air temperature
due to lack of air
circulation Manual reset
• Safety thermostat
broken or not connected
Manual reset
Burner fan broken. Manual reset
FAN electrical cables
broken or not connected
Manual reset,
autoreset
after 5 min.
Absence of signal from
Auto-reset
probe or broken probe
• The minimum heat
power of the PCH heater
module is over-sized
Auto-reset
compared to the power
if NTC1<
output required by the
TH1-15
environment.
• Check the TH1 param.
- air intake set point.
No voltage during
Auto-reset
operation
Perform a manual reset
of the PCB; replace
Manual reset
the CPUSMART if the
problem persists
47