Vulcan-Hart 7595 Manual de usuario descargar pdf (Pagina 10)

SERVICE (Cont.)

High Limit Control: The function of the High Limit Control is to

shut the unit down in the event of a thermostat failure which

would allow the cooking oil to be over heated. The operating

temperature of the High Limit Control is 450° or 50° higher than

the highest temperature allowed by the thermostat when the

thermostat is functioning properly.

In the event of a high limit "Shut Down" the entire control

system will be put out of operation, and relighting the pilot will

be required (See Instructions on Page 4).

DO NOT attempt to re-light the pilot unit the temperature

of the cooking oil has lowered to approximately 350°.

Thermostat service is indicated if the high limit Cut-Off

Persists.

The High Limit Control is located behind the manifold pipe

in the lower cabinet.

TESTING

TESTING MILLIVOLT SYSTEM "G" UNITS

Millivolt meter required for powerpile and Pilot Outage

Protection Device Tests.

1. Powerpile Test

Turn the thermostat to "OFF" Disconnect powerpile lead from

control and clamp meter leads to powerpile tip and capillary.

Plug in meter leads to 1000 MV scale Turn control lever to pilot

position and light pilot burner. Hold in manually for 2 to 4

minutes until meter needle has steadied out. Meter reading

should be no less than 150 millivolts closed circuit If less

replace the thermopile.

2. Safety Magnet

Turn thermostat to "OFF" If unit is not in operation, turn control

lever to "PILOT" position and light pilot burner. Allow 2 to 4

minutes for powerpile to reach maximum output. Turn control

lever to "OFF" to extenguish pilot Meter reading will slowly

decrease as powerpile is cooling. Read meter when drop out

clock of pilot outage protection device is heard. Replace

detection device magnet or entire valve if reading is lower than

40 MV closed circuit.

3. Thermostat Check

A. "KX" thermostat - 120 volt system used on models 7494E &

7495E.

Turn thermostat to "OFF". If unit is not in operation, turn control

lever to pilot position and light pilot burner. Allow time for

powerpile to reach maximum output. Turn control lever to "ON"

position. Turn thermostat on to temperature setting above that

of fat If main burners do not light, turn thermostat back to

"OFF". Remove front panel screws and drop front panel away

from unit to examine terminal connections to thermostat. If

loose, tighten and recheck thermostat operation. If thermostat

fails to operate main burners, jump thermostat terminals with

screwdriver blade, or by other means. If main burners then

operate, it indicates faulty thermostat.

B. "GS" thermostat for millivoltage system used on models

7594G & 7595G

Turn thermostat to "OFF" If unit is not in operation, turn control

levers to pilot position and light pilot burner. Allow time for

powerpile to reach maximum output. Turn control lever to "ON"

position. Turn thermostat on to temperature setting above that

of fat If main burners do not light, turn thermostat back to

"OFF". Test as follows:

Check for gas flow through 1/4" bleed tubes Bleed gas is

routed from safety valve to thermostat back to safety valve.

Tubes must be open for free gas flow. If tubes are open,

remove tube at outlet of thermostat and blow into this tube. If

main burners cycle on, replace the thermostat If the main

burners do not come on, replace the safety valve.

IMPORTANT: If main burner gas is on and cannot be

controlled or cycled with the thermostat, a gas leak in the bleed

gas system is indicated.

NOTE: In the event that the fat temperature reaches 450° the

high limit control will shut down the system. See High Limit

Control Instructions.

NOTE: When replacing thermostat, make sure excess capillary

tubing from bulb is coiled neatly out of burner flame areas. Do

not allow capillary lead to touch side of heat exchanger tubes.

CALIBRATION:

Each model KX electric thermostat and "GS" gas thermostat is

adjusted at the factory and calibrated on precision instruments

to control temperatures accurately. Adjustment or recalibration

is not needed unless the thermostat has been mishandled in

transit, or changed or abused while in service.

To check calibration:

1. Use a potentiometer or good grade thermometer to

determine temperature at the location where temperature

regulation is required.

114590-7

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