14
15
When checking components, turn the power off and discharge voltage.
COMPONENT TESTING INFORMATION
5
!
CAUTION
FOR LG TECHNICIAN
Component
Test Procedure
Check result
Remark
1. Thermal cut off
•
Check Top Marking:
N140
Measure resistance of terminal
to terminal
Open at 284 ±
`
°F
(140 ± 5°C)
G
Same shape as outlet thermostat.
If thermal fuse is open must
be replaced
Resistance value
Continuity (250°F
˨
) < 1
Ω
•
Heater case-
Safety
•
Electric type
2. Hi limit Thermostat
(Auto reset)
Measure resistance of terminal
to terminal
Open at 257 ± 9°F
(125 ± 5°C)
Close at 2
W
1 ±
XY
°F
(94 ± 7°C)
Resistance value
∞
Resistance value < 5
Ω
•
Heater case -
Hi limit
•
Electric type
3. Outlet Thermostat
•
Check Top Marking:
N85
Measure resistance of terminal
to terminal
Open at 185 ±
`
°F
(85 ± 5°C)
G
G
Same shape as thermal cut off.
②
Close - Not recovery
Resistance value
∞
Resistance value < 5
Ω
•
Blow housing -
•
ElectricType
•
GasType
Safety
4. Lamp holder
Measure resistance of terminal
to terminal
Resistance value:
80
Ω
~ 100
Ω
6. Idler switch
Measure resistance of the
following terminal:
COM - NC
1. Lever open
Resistance value < 1
Ω
2. Lever push (close)
Resistance value
∞
5. Door switch
Measure resistance of the
following terminal
1) Door open
Terminal: COM - NC (1-3)
Terminal: COM - NO (1-2)
2) Door closed
Terminal: COM - NC (1-3)
Terminal: COM - NO (1-2)
Resistance value < 1
Ω
Resistance value
∞
Resistance value
∞
Resistance value < 1
Ω
∞
14
Component
Test Procedure
Check result
Remark
7. Heater
Measure resistance of the
following terminal
Terminal: 1 (COM) - 2
Terminal: 1 (COM) - 3
Terminal: 2 - 3
Resistance value: 10
ȳ
Resistance value: 10
ȳ
Resistance value: 20
ȳ
•
Electric type
8. Thermistor
Measure resistance of terminal
to terminal
Temperature condition:
58°F ~ 104F (10~40°C)
Resistance value: 10
ȳ
•
Heater case -
Hi limit
•
Electric type
9. Motor
•
See Page 17
10. Gas valve
valve 1
valve 2
Measure resistance of the
following terminal
Valve 1 terminal
Valve 2 terminal
Resistance value: > 1.5~2.5 k
ȳ
•
Gas type
11. Igniter
Measure resistance of terminal
to terminal
Resistance value: 50~800
ȳ
•
Gas type
12. Flame Detect
Measure resistance of terminal
to terminal
Open at 370°F ((Maximum)
Close at 320°F
Resistance value
˳
Resistance value < 1
ȳ
•
Gas type
FOR LG TECHNICIAN
15