Lennox Fhm 170 Installation, Operating And Maintenance Guide

HEATING : GAS BURNER
FLEXYII_WSHP-IOM-1307-E - 67 -
GAS BURNER TROUBLESHOUTING
If faults reported on CLIMATIC
-Reset the CLIMATIC.
-Check voltage: 230V after circuit breaker.
-Check GAS isolation shut-off valves are open.
-Check GAS pressure at the inlet of the GAS valves. It must be >20 mbar when the Burners shut down.
-Adjust the set points to priorities the burner. Increase the value of the room temperature set point to a temperature higher than
actual room temperature.
DIAGNOSTIC TABLE BALTIC GAS BURNER
STAGE
NORMAL
OPERATION
POSSIBLE
FAULT
ACTION POSSIBLE SOLUTION
Heating
Requested
Extraction fans
start
Fault on the
blower
thermostat
+ Check connections on the blower
thermostat.
+ Replace thermostat
Lack of gas
supply
+ Check valve’s opening & supply pressure + Restore gas supply
Fault on the
superheat
thermostat on the
gas burner
support bar
+ Check superheat thermostat’s operation
after manual reset
+ Replace superheat
thermostat
Starting of
the
extraction
fans
Extraction Fans
are running
After 10 seconds
safety shutdown
by the ignition
control block
+ Check connections of the control block on
the gas valve
+ Repositioning of the
control block on the valve
+ Replace valve
Nothing happens
+ Check the free movement of the fan wheel
+ Check Electrical connection on the Gas
Ignition Control Block and on EF connection
Board
+ Check the Fan supply voltage
+ Replace fan
+ Replace EF connection
board If necessary
Extraction
Fan is ON
After 30 to 45
seconds: pre-
ventilation the
fire-up
electrode
should spark.
Continuous
Ventilation
without sparks
from fire-up
electrode
+ Check the fire-up electrode
+ Check the pressure drop at the pressure
switch: It must be higher than 165 Pa
+Check the good operation of the pressure
switch using an Ohmmeter and by artificially
creating a depression in the tube.
+ Re-
position the pressure
switch tube.
+ Change the pressure
switch.
Continuous
ventilation
and sparks
from fire up
electrode.
After a few
seconds the
gas burner
fires-up
After 4 seconds
the GAS Burner
still not operating
and safety
shutdown by the
Ignition Control
Block.
+ Check injection pressure during start-up
(Value for High Heat)
+Remove the control box from the gas
block.
+ Remove the air from the
Gas pipe-work
+ Adjust the injection
pressure to high heat
value.
+ Change the Control Box
if the Gas valve is OK.
Within 4 seconds
the gas Burner
fires-up BUT
safety shutdown
from the Ignition
Control Block.
+ Check the Position and connection of the
Ionisation Probe. It must not be Earthed
(230V).
+ Measure the Ionisation Current: It must be
higher than 1.5 microAmps.
+ Check the Type of GAS.
+Check the whole
electrical supply.
+ Adjust the supply and
injection pressure if gas is
different from natural gas
G20 :( G25 Gas of
Groningue for example).

Lennox Fhm 170 Specifications

General

Brand	Lennox
Model	Fhm 170
Category	Heat Pump
Language	English