Shizuoka Seiki VAL6 EPX Series, Руководство по обслуживанию

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PAGE 19
VAL6 EPX Trouble Shooting
No. Possible Cause How to check Result Remedy
81 Replace a burner control
Flame bounces out from the disk
EPX5 yellow-yellow:
approx. 700Ω
EPX1 yellow-yellow:
approx. 3.3kΩ
(Cord color & Standard value)
Replace a fuel pump
Smell of fuel comes out
76
Fuel filter element is
clogged Check with eyes whether
or not the fuel filter is dirty
or fouled Replace a fuel filter
Expand an air inlet opening
gradually until smoke is
clear away
Normal scale: 5
Check whether correct nozzle is used
0.85USgal/h 60°H for only H-lot
0.75USgal/h 60°H for others
Replace a correct nozzle
If air inlet opening if too
much, imperfect
combustion occurs
Check whether air inlet
opening for combustion is
appropriate If opening is small,
imperfect combustion
occurs by low oxygen Adjust a air inlet opening
Normal scale： 5
Combustion air is
insufficient Check whether vanes of
combustion fan are dusty If vanes are dusty,
imperfect combustion is
occurs by low oxygen Clean a vanes of
combustion fan
73
77
Heater is using in high altitude
Oxygen for combustion
is low because of high
altitude Check whether the heater
is operating in an altitude
higher than 1000m If its altitude is higher than
1000m, imperfect
combustion occurs by low
oxygen environment
Narrow an air inlet opening
Normal scale: 5 Combustion air is too
much Check whether air inlet
opening for combustion is
appropriate
Nozzle is incorrect
Replace a changeover
switch Changeover switch
cord is disconnection /
Changeover switch is
defective
If it shows 0V, the burner
control is defective.
If it shows standard voltage
AC 230V (EPX1)/AC 120V
(EPX5), the fuel pump is
defective.
75
74
If it shows 0Ω, the fuel
pump coil is short-circuited
78
79 Solenoid valve cord is
disconnection /
Solenoid valve is
defective Measure voltage at 1-3
PIN terminal of fuel pump
connector (CN 14) on
burner control
If it doesn't conduct (∞Ω)
when the changeover
switch is "ON", changeover
switch cord is
disconnection /
changeover switch is
defective
Not applicable in above
Internal thermostat doesn't work (Heater doesn't stop operation at preset temperature)
External thermostat is
working Remove or turn off an
external thermostat If it works normally, the
heater complies with the
preset of external
thermostat
《Relationship between Internal thermostat and External thermostat》
Heater shall comply with higher preset temperature between internal and external thermostat. In order to
activate the external thermostat, an internal thermostat knob must be set on "Ext. thermo" position. Or the
external thermostat must be removed, turned off or set at lowest preset temperature when the internal
thermostat is used.
Replace a fuel pump
Solenoid valve of fuel
pump is short-circuited
Changeover switch doesn't work
Check the conduction of
tip-over switch
Cord color: white-white
Standard: 0Ω (with
changeover switch "ON")
82
80
Remove or turn off an
external thermostat
Disconnect fuel pump
connector (CN 14) from
circuit board, then measure
resistance between
terminals
Replace a burner control