Raypak B-195 - Manual (Page 17)

Continuation TROUBLE SHOOTING GUIDE
3d. Excessive negative pressure exerted
by the exhaust system on the vent will
prevent N.O. combustion air/vent
switch from closing. Provide means to
relieve pressure and close the N.O.
switch. If combustion air/vent switch
will not close, replace switch.
3e. Disconnect igniter leads from ignition
module. Make sure 24V is present
across ignition terminals on the igni-
tion module during the ignition cycle.
If not, replace ignition module. Check
resistance reading across igniter
leads. If circuit is open, or reading is
greater than 30 ohms, replace the
igniter. A new igniter will measure
between 1 to 6 ohms at room tem-
perature.
3f. During the ignition cycle, 24V should
be present at the MV1 and GND termi-
nals for about 5 seconds. If no 24V is
measured, replace the ignition mod-
ule. If 24V is present, replace the gas
valve.
4a. Check ground connections inside
control box.
4b. Check all connections and wire nuts.
4c. Check wire connection to remote sen-
sor.
4d. Check gas pressure at outlet of valve
under load, pressure should be:
3.5 in. W.C.for Natural gas
10.5 in. W. C. for Propane gas.
5a. Ensure supply water temperature is at
least 140°F.
5b. Ensure dishwasher operates correctly.
Check rinse cycle time and inspect
spray nozzles for correct pressure
setting or damage.
5c. Adjust operating limit to minimum tem-
perature that provides 180°F rinse.
(Do not set above 185°F).
-Verify booster operates correctly, if
not, recheck all procedures listed
above.
3d. Excessive vent exhaust or
defective air/vent switch.
3e. Ignition module or igniter
may be defective.
3f. Gas valve or the ignition
module may be defective.
4a. Improper ground
4b. Loose wiring.
4c. Remote sensor
4d. Insufficient gas pressure.
5a. Supply water temperature
too low.
5b. Dishwasher times not set
properly.
5c. Operating limit set too low.
4. Unit energized, pump and
blower running.
Ignitor is glowing.
Burners will not stay lighted.
5 Unit does not produce
suffcient hot water
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