4-8
LIMITER
2A
2B
1A
1B
2A
2B
1B
1A
WARNING
Test Procedure
HOT SURFACE INDICATORS
To test a limiter, perform the following steps:
1.
Use an ohmmeter and set the range to
R x 1.
2.
With no power applied, touch the ohmme-
ter leads to the following terminals. You
should obtain the following readings at
the indicated temperature:
1A and 2A opens @ 1025˚F
1B and 2B closes @ 275˚F
If the readings are not within the range shown,
the limiter is defective and should be replaced.
R1
R1
R1
R1
N
N
N
N
COM
N = NEON LAMP
R1 = 30 k
Ω
.33W
±
5%
R1
R1
R1
R1
N
N
N
N
COM
N = NEON LAMP
R1 = 68 k
Ω
.5W
±
5%
R2 = 470 k
Ω
.5W
±
5%
R2
R2
R2
R2
240 V
SCHEMATIC
120 V
SCHEMATIC
Electrical Shock Hazard
Disconnect from electrical supply before ser-
vicing unit.
Failure to do so could result in death or
electrical shock.