Vulcan-Hart GRS25 Service Manual page 5

COMBINATION VALVE GAS PRESSURE CHECK
1. Check pressure rating of appliance as stated on the fryer door.
2. Connect a manometer to the pressure tap of the gas combination valve (gas tap is marked on valve).
3. Turn on all appliance burners.
4. Open the pressure tap of the manometer.
5. The manometer reading should match the pressure rating inches water column as stated on the appliance
rating plate.
6. If pressure rating is off check the incoming store gas pressure line. If store line pressure is good continue
with the following steps.
7. Remove the regulator adjustment cap from the combination valve.
8. Turn the gas adjustment screw clockwise to increase pressure and counterclockwise to decrease pressure.
9. Adjust pressure so that manometer reading agrees with the rating plate.
ON-OFF ROCKER SWITCH (D.P.S.T.)
1. Unplug fryer.
2. Follow steps under Removal of Control Panels.
3. Note and disconnect wiring from switch.
4. With an ohm meter and switch in the "off" position measure for continuity across the (2) switch pins that were
connected to power. An ohm reading of infinity should be found.
5. With an ohm meter and switch in the "on" position measure for continuity across the (2) switch pins that were
connected to power. An ohm reading of 0 should be found.
6. If readings measured in either steps 4 or 5 do not agree with what is stated in these steps replace the switch.
SIGNAL LIGHT
1. With unit power connected follow steps for Removal of Cooker Control Panel except do not
disconnect the control panel electric supply wire harness.
2. Turn power switch "on".
3. If light fails to illuminate, with a voltage meter measure for voltage of between 110 and 120 volts
across the light connections. If voltage is not found replace light.
BURNER PILOT CHECK
1. Follow steps 1-8 under Removal of Burner.
2. Follow steps 1-3 under Removal of Burner Pilot and Orifice.
3. Examine the pilot body and orifice for clogging.
4. If clogged blow through one end of device. If clogging is still evident soak in warm water, use small probe
or contact cleaner to clear the obstruction. Do Not enlarge pilot orifice opening. If clogging still persists
install new body or orifice as required.
5. Follow steps 1-2 above in reverse to install new parts or reinstall repaired parts.
TRANSFORMER CHECK
1. Follow steps 1-6 under Accessing of Controls Inside the Control Box.
2. Follow Steps 1-4 under Removal of Transformer.
3. With a volt meter and the appliance "on", check the voltage across the load and line terminals. Voltage
should match that of the transformer markings.
EXAMPLE: Transformer marked - PRI. 120V
Means that the load input reading should be 120V and the line output reading should be 24V.
4. If the readings do not match replace the transformer.
5. If readings do match but transformer problem is still suspected, check for resistance across the load terminal.
SEC. 24VAC
5