Shark HNG-3010, Operator'S Manual, Page: 16 / 36

16
HNG SERIES PRESSURE WASHER
OPERATOR’S MANUAL
A. Complete Millivolt System Check
(“A” Reading = Switch contacts CLOSED - Gas
Cock Dial “ON” - Main burner should come ON).
1. If the reading is more than 100 millivolts and the
automatic valve still does not come on, replace
the automatic valve operator.
2. If the closed circuit reading (“A” Reading) is less
than 100 millivolts, determine cause for low read-
ing - proceed as follows:
B. Thermopile Output Reading Check
(“B” Reading = Switch contacts OPEN - Main burner
OFF).
If the minimum 250 millivolt reading is not obtain-
able, readjust pilot for maximum millivolt output.
If millivolt reading is still below minimum speci-
fied, replace thermopile.
2 Lead Thermopile
Equivalent
To (CP-2)
Igniter
Pilot 2CH-2
or
Equivalent
To Burner
Flow Switch
Gas
Valve
2 Lead
Thermopile
Connections
C. System Resistance Check
(“C” Reading = Switch contacts CLOSED - Gas Cock
“ON” - Main burner should be ON)
If the “C” Reading is more than that specified
for the system being checked, this indicates the
resistance in the system is excessive and must
be reduced. To correct:
a. Clean and tighten switch leads and connec-
tions.
b. Shorten switch lead wires and/or replace
with heavier gauge wire.
c. Cycle switch rapidly to clean contacts.
D. Automatic Pilot Dropout Check
1. Hold gas cock dial depressed in pilot position un-
til maximum output is observed. Then extinguish
pilot and observe meter.
2. Dropout of automatic pilot magnet (sound should
be audible) should occur between 120 millivolts
and 30 millivolts. If dropout occurs outside these
limits, change the automatic pilot magnet assem-
bly.