Manitowoc-ice Q Manuel d'utilisateur télécharger pdf (Page 48)

Before Calling For Service Section 5

5-2

Part Number 000001530

Safety Limit Feature

In addition to the standard safety controls, such as the

high pressure cutout, your Manitowoc ice machine

features built-in safety limits which will stop the ice

machine if conditions arise which could cause a major

component failure.

Before calling for service, re-start the ice machine using

the following procedure:

1. Move the ICE/OFF/CLEAN switch to OFF and then

back to ICE.

A. If the safety limit feature has stopped the ice

machine, it will restart after a short delay.

Proceed to step 2.

B. If the ice machine does not restart, see “Ice

machine does not operate” on the previous

page.

2. Allow the ice machine to run to determine if the

condition is recurring.

A. If the ice machine stops again, the condition has

recurred. Call for service.

B. If the ice machine continues to run, the condition

has corrected itself. Allow the ice machine to

continue running.

SAFETY LIMIT STAND-BY MODE

The first time a safety limit shut down occurs, the ice

machine turns off for 60 minutes (Stand-By Mode). The

ice machine will then automatically restart to see if the

problem re-occurs. During the Stand-By Mode the

harvest light will be flashing continuously and a safety

limit indication can be viewed. If the same safety limit is

reached a second time (the problem has re-occurred)

the ice machine will initiate a safety limit shut down and

remain off until it is manually restarted. During a safety

limit shut down the harvest light will be flashing

continuously.

SAFETY LIMITS

Safety Limit #1

If the freeze time reaches 60 minutes, the control board

automatically initiates a harvest cycle. If three

consecutive 60 minute freeze cycle occur, the ice

machine stops.

Safety Limit #2

If the harvest time reaches 3.5 minutes, the control

board automatically returns the ice machine to the

freeze cycle. If three consecutive 3.5 minute harvest

cycles occur, the ice machine stops.

Problem Possible Cause To Correct

Ice machine produces shallow or

incomplete cubes, or the ice fill pattern on

the evaporator is incomplete.

Ice thickness probe is out of adjustment. Adjust the ice thickness probe.

(See Section 4)

Water trough level is too high or too low. Check the water level probe for damage.

(See Section 3)

Water inlet valve filter screen is dirty. Remove the water inlet valve and clean

the filter screen. (See Section 4)

Water filtration is poor. Replace is filter.

Hot incoming water. Connect the ice machine to a cold water

supply. (See Section 2)

Incorrect incoming water pressure. Water pressure must be 20-80 psi

(137.9 - 551.5 kPA)

Ice machine head section is not level. Level the ice machine head section.

(See Section 2)

Low ice capacity. Water float valve filter screen is dirty. Clean the filter screen. (See Section 4)

Incoming water supply is shut off. Open the water service valve.

Water float valve stuck open or leaking. Clean or replace the water float

valve.(See Section 4)

The condenser is dirty. Clean the condenser. (See Section 4)

High air temperature around condenser

unit.

Air temperature must not exceed

120°F

(48.8°C)

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Manitowoc-ice Q Manuel d'utilisateur Page 48

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