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Testing the Ignition Safety Shut-off
The ignition system safety shutoff must be tested by
conducting the following tests:
For Standing Pilot Systems
1. With the main burners on, remove the pilot adjust-
ment cover screw.
2. Insert a small slot screw driver and turn the adjust-
ment screw clockwise until pilot flame goes
out. Count and note number of turns made.
3. Gas valve will shut off main burners after about
three (3) minutes. End of test. If the gas valve will
not shut off, follow the instructions "To Turn Off
Gas To Heater" and call service technician or your
gas supplier.
4. Return pilot adjustment screw counterclockwise
same number of turns as in step 2.
5. Replace pilot adjustment cover screw, then follow
the lighting instructions to get heater ready for
operation.
CAUTION: Should overheating occur or the gas
supply fails to shut off, DO NOT turn off or discon-
nect the electrical supply to the pump. Instead, shut
off the gas supply at a location external to the heater.
Failure to observe this precaution may aggravate the
overheated condition resulting in possible damage to
the heater and injury to the user.
NOTE: There is no pilot adjustment cover on
Robertshaw 7200 gas valve.
3
2
1
S
E
T
P
I
L
O
T
O
N
O
F
F
PILOT
ADJ
PILOT KEY
Pilot Adjustment
Fig. 15: Robertshaw 7200 Gas Valve (Models 0135 &
0195)
For Automatic Ignition Systems
1. Turn on power to the ignition systems and turn gas
supply off at the gas valve.
2. Check ignition module as follows:
a. Set the tankstat to high setting.
b. Watch for continuous spark at the pilot burner.
c. Time the spark operation. Time must be with-
in the lockout timing period (15 or 90
seconds).
d. Turn tankstat down to end call for heat and
wait 60 seconds on lockout models before
beginning step 3.
3. Turn on gas supply.
4. Set tankstat to high setting.
5. Systems should start as follows:
a. Spark will turn on and pilot gas valve will open
at once. Pilot burner should ignite after gas
reaches the pilot burner.
b. Spark ignition should cut off when pilot flame
is established.
c. Main gas valve should open and main burner
should ignite after gas reaches the burner
port.
Flame Failure
With burner operating, close the manual fuel valves to
simulate a flame failure. System should lock out after
safety switch timing (15 seconds). After the safety
switch has cooled, open the manual valves (relight
standing pilots) and reset the safety switch; the burner
should restart.
Inspection Procedures
Burners
Clean main burners and air louvers of dust, lint and
debris. Keep heater area clear and free from com-
bustibles and flammable liquids. Do not obstruct the
flow of combustion and ventilating air. Make visual
check of burner and pilot flame. Yellow flame indicates
clogging of air openings. Lifting or blowing flame indi-
cates excess high gas pressure. Low flame indicates
low gas pressure.