Service manual

7. If a surging sound is coming from the wash pump, check the pump ﬁ lter and tank trays. They may be

ﬁ lled with debris. Clean the ﬁ lters and trays, reﬁ ll the machine. [OPERATOR ERROR]

8. When racks do not travel completely through the machine, examine the bottom of all the dishracks. If

the “ladder” bars are missing or broken, the rack must not be used. The dishrack is part of the

conveyor system and must be intact and complete. [OPERATOR ERROR]

9. Chemical supply is provided by the chemical company. [SERVICE ITEM]

10. The curtains must be in good repair and properly placed in the machine to retain temperature in the

wash environment. If the curtains were left out, the air would circulate through the machine and rapidly

cool the water sprays. [OPERATOR ERROR]

11. Dish and glass appearance is often referred to as “results.” If the results are poor, there are several

factors which affect the outcome of the washing process.

First is procedure. If the dishes are not placed so the sprays can reach them, the results will be poor.

If large amounts of soil are left on dishware, this will eventually overwhelm the process (any size tank

can be overﬁ lled).

Second is temperature and water condition. If water temperature is too low or too high it will cause

problems. Hard water with high mineral levels will build up a white substance in the watered areas of

the machine. A 1/16

”

layer of build-up on the surface of a heater element will reduce its efﬁ ciency by

twenty percent (that’s like turning a 10kw heater into an 8kw). If there are scale producing elements

such as TDS, carbonates, silicates, calcium, sodium, other minerals or chemicals— results will suffer.

This is especially true of well water.

A good test for poor water conditions is to take clean glasses, hand buff them, turn off all chemical

feeders, wash the glasses 4 or 5 times in clear water in the machine. If they come out spotty or cloudy,

you have a water problem not a machine or chemical problem. It is important to treat hard water before

it is used in conveyor equipment. [BUILDING MAINTENANCE]

Third, installation problems are the # 1 cause of operational disruptions and will affect performance.

If the machine is improperly installed no amount of tuning or adjustment can compensate for the lack

of essential process elements. The installer must return and correct the omitted elements of the

installation.

12. Check tightness of wire connections on all high amp draw terminals. These are identiﬁ ed as heater

connections. Disconnect power to the machine ﬁ rst. Check main distribution block, circuit breaker,

contactor, heater terminals. Check all screw terminals with a screwdriver, should be hand tight.

This will take less than a minute to perform but pay high dividends over the service life of the machine.

[SERVICE ITEM]