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GOFAR Services, LLC - Appliance Repair Houston, TX - Chapter 8DOMESTIC ICEMAKERS8-1 ICEMAKER TYPESIcemakers are divided into two basic types; flex-tray and hard tray.
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The statements and opinions expressed within Customer Reviews reflect each author's personal perspective and do not imply endorsement by MidwayUSA, its Employees or any other organization. The total weight of the product, including the product’s packaging as it sits on our shelf. Product ships from MidwayUSA, separate from any other products on your order due to its size. Product is regulated by the US Department of Transportation (DOT) and cannot be shipped via USPS or air shipping methods.
Product is restricted by shipping carriers and cannot be shipped to certain locations or via certain shipping methods. Everything really starts with our Vision, which is: 'To be the best run, most respected business in America, for the benefit of our Customers'. Here are nine easy steps to help you keep your car in pristine condition and prevent rust from appearing on your pride and joy. Rust can be caused by the accumulation of road salt, dirt, moisture or chemicals in those places not normally reach by day-to-day cleaning. Moisture that stays in certain areas of the vehicle for extended periods may also promote corrosion even when the rest of the vehicle is dry. Warning: Do not apply additional undercoating or rust preventive coating on or around the exhaust system components like the exhaust pipe or catalytic converter. Customers should in no way infer that MidwayUSA has validated review information as safe, accurate or appropriate. Products that are Shipped Alone incur separate "Per Order" and "Per Pound" shipping charges. Carriers charge extra to ship packages with products they consider hazardous, such as reloading powder and primers. This occurs when all Customer Service Representatives are busy serving other Customers, or Customer Service is closed. Or by chips, scratches and any damage treated or painted metal surfaces resulting from minor accidents or abrasion by stone and gravel. And high temperatures will also cause corrosion to other parts of the vehicle that aren't ventilated well enough for quick drying.
If you drive on salted roads, the car should be washed at least once a month during winter. Remove any foreign material, such as chemicals, salt, bird droppings, tar and so on, from the painted surface of your car. Regularly inspect your vehicle for scratches, dents and chips and repair as soon as possible with touch up paint. Also like manual molds, when it comes time to eject (harvest) the ice from the mold, it invertsand twists, "popping" out the ice.
Because of variations in the manufacturing process, similar products may have differing weights. Dust control chemicals, sea air or industrial pollution will also accelerate corrosion, as will high humidity, particularly when the temperature is just above freezing point. If you often wash your vehicle in the garage, or drive it in the wet, the garage may be damp and the high humidity will accelerate corrosion. The tray then turns back upright and refills with water for the next freeze cycle.HARD-TRAYHard-tray icemakers have a metal ice mold which is coated with a non-stick coating.
Unless the product is designated as “Ships Alone”, Shipping Weight does not include the shipping box or packing materials associated with your order. The amount of time spent in the freeze cycle is controlled by a number of factors depending on the individual design, but it is best explained by knowing how the harvest cycle is triggered.HARVEST CYCLEThe harvest cycle occurs when the ice is ejected from the ice mold. However, it should be noted that the accumulation of "run" time is, in one way or another, thermostatically controlled. For example, Admiral-type flex-tray machines have a thermostat in line with the icemaker timing and drive motor that opens at 19 degrees, and doesn't close again till the freezer temperature drops to 15 degrees. A thermostat pressed against the ice mold senses that it is cold enough to ensure that the ice is frozen. When the harvest mechanism contacts the ice, it stalls until the ice melts enough to release it from the mold. Cubes in the bin might occasionally stick together a little bit because of this liquefication, but they should be easy to separate.In a hard-tray icemaker, the thermostatstartsthe harvest cycle, but it does notendthe cycle. The mold heater would open the thermostat and end the cycle way too early; long before the mold was refilled.
When the thermostat begins the harvest cycle, a cam attached to the drive motor closes a "holding" switch.
This switch keeps the drive motor turning until the ice is harvested and the mold refills with water. When the ejection mechanism is reset, the mold is refilled and the cam reaches the proper position, the cam allows the holding switch to open.
This ends the fill cycle and begins the freeze cycle.FILL CYCLE AND FILL VALVETowards the end of the harvest cycle, a cam on the drive mechanism closes the fill switch. This switch opens a fill solenoid valve, usually located on the back of the fridge, at the bottom.
The shape of the cam that closes the fill switch controls the length of time the valve stays open.
A flow control washer within the valve adjusts the flow for variations in house water pressure, so that the same amount of water flows through the valve regardless of water pressure. After a repair, you can't stand there with the freezer door open, waiting for the next harvest cycle, to make sure the machine is working properly. Most icemakers are temperature-sensitive, and as the freezer temperature rises and falls, this sensitivity can cause symptoms to be intermittent.Icemakers can behave erratically, and be difficult to diagnose because of it. But a basic understanding of how a particular design operates can go a long way towards removing the mystery of intermittent malfunctions. Knowing how the icemakershouldoperate may point you towards whatisn'toperating correctly.Has the fridge or freezer seemed warmer or colder than usual?
This can point towards refrigerator problems other than the icemaker, such as defrost or sealed system problems. Any higher, and the ice may not freeze fast enough or the thermostat may not trigger a harvest cycle.
Any lower, and the cold may migrate into the refrigerator compartment.Has the freezer or refrigerator door been opened a lot?
In some circumstances, this can keep the freezer temperature too high and cause slow or no ice production, or "shelling," where the cube has not frozen completely before the harvest cycle begins.Do not yet discard any "slabbed" ice. The ice cubes are "shelling," or not freezing completely before the harvest cycle tries to eject them from the mold.
See section 8-2(b).D) The fill tube keeps filling with ice and blocking the flow of fill water.
See section 8-4.8-2(a) SLABBINGThis generally occurs when the ice is not ejecting from the ice mold properly. If there are cubes left in the ice mold after a harvest cycle, the new waterfill will overfill the mold for the next batch. Depending on the design, this may cause the mold to overflow, or it may just cause a thick sheet of ice to fuse together the tops of the cubes too solidly. In this case, the icemaker can jam and the problem can compound itself rapidly.This can be caused by a number of factors.

This can simply prevent the ice from dropping into the bin, (Figure S-1) or it can interfere with the ice level sensor arm, preventing the icemaker from shutting off when the bin is full.
Both hard-tray and flex-tray machines are prone to this problem; it is caused by impurities in the fill water. The problem can get so bad that you may see black or gray flakes and sediment in the cubes.
In both hard- and flex-tray machines, the solution is usually to replace the ice mold, or just the entire icemaker. If you do this, rinse the mold with a weak chlorine bleach solution and flush with copious amounts of water before you put the mold back into service.
The next fill will then cause overfill, and slabbing symptoms may develop.Low water pressure can also cause the valve to leak, sometimes badly enough to overfill or overflow the ice mold. See Section 8-2(c), section 8-3 and Figure S-4.8-2(b) SHELLINGHollow cubes, or "shelling" can occur if the ice cubes are not fully frozen when the harvest cycle begins. Depending on the design, either the harvest cycle is being triggered prematurely, or the cube is not freezing in the allotted time.Shelling may be an early sign of defrost, sealed system or other cooling problems of the refrigerator itself, especially in flex-tray machines. The freezer vents in flex-tray machines must direct cold air directly at the surface of the water or the mold, to insure that it will freeze in the alloted time. Check that nothing is blocking the airstream and that the freezer vent directing air over the icemaker is not damaged, missing or misdirected.In hard-tray machines with shelling symptoms, ice or water left in the mold after harvest may cause overfill and slabbing problems.
Shelling is usually a sign of low waterfill, which allows the mold to get colder faster, triggering the thermostat into a harvest cycle too quickly.
Check and adjust the water level (sections 8-5 thru 8-8) or check for low water pressure or the incorrect water valve. Over time it will freeze the tube completely shut.To melt the ice from the tube and clear it, you can use a blow dryer, or blow hot water into the tube with a turkey baster. Sediment from improper installation or low water pressure may prevent the valve from closing fully. If you have this symptom, especially if it returns after clearing the ice blockage once, start checking for water supply pressure or sediment problems. I've seen people tap into hot water pipes, but the piping should be long enough so that water does not fill the icemaker while hot, or the water may not freeze fast enough.
It is far better to use a cold water line if possible."Saddle valves" are often used on a new installation to pierce into an existing pipe, (Figure F-1) and generally work pretty well.
However, you must be careful of using dissimilar metals; for example a copper valve on a galvanized steel pipe. A water supply drawn from a saddle valve on a galvanized pipe is an invitation to scale and sediment problems.Similarly, a saddle valve installed too close to a hot water tank can pick up calcium sediments from the tank itself.
Scale and sediments can block the saddle valve and cause low water flow.Low water flow through the saddle valve may cause the same symptoms as low water pressure at the solenoid valve inlet.
They can also get into the solenoid valve seat and prevent the valve from closing fully, causing symptoms from fill tube freeze to slabbing. However, the only long term solution is to secure a better supply, directly from a copper cold-water pipe if possible.
It's a little cheaper, easier to cut and install, and less prone to leakage when you have to move the refrigerator. However, some people feel it's more prone to leakage than copper simply because the material is stronger.
That's not been my experience, but it's your call.If you do use plastic, make sure you insert the brass sleeves into the ends (Figure F-2) before installing the compression fittings. Without them, the ends of the plastic could collapse and leak.HOT WATER OR COLD?I've seen people tap into hot water lines to feed the icemaker, but I highly recommendagainstit.
But when the temperature of the water drops, the heat flow slows to the same rate as if you had just filled it with cool water in the first place. Common complaints and contaminants are chlorine, rust, sand, dirt, sediment, dissolved calcium, organic substances such as PCB's, THM's, herbicides and pesticides, chloramines and detergents, causing bad taste, odors or even health hazards. This book is not intended to be a primer on water filtration; I would in no waybegin to try to pretendto be able advise you what contaminants you need to guard against in your area. For that, you need to hire a water chemist, or talk to your water company or neighbors who might have been through this already. These contaminants you can pick up independent of what your water company supplies you, through old or inadequate water piping or other house conditions. You don't think the pipefitters washed all the bugs and dirt out of the tubing before they brazed it in place, do you?INLINE AND UNDER-SINK (CARTRIDGE) FILTERS(Figures F-3 and F-4)In my opinion, about the only good thing about inline filters (vs.
Being behind the fridge instead of under the sink, they are harder to get to, and easier toforgetto change.Cartridge-type filters, on the other hand, have replacable cartridges which are relatively easy to get to and change. Some even have water shutoff valves built right into them to make filter changing even faster and easier. They are little, if any, more difficult to install initially, and replacement cartridges usually cost less than a new inline filter.
When the new membrane is new, probably half of the water that enters the RO system goes down the drain to flush themembrane.
If you don't change the elements frequently, then when the membrane gets older and plugged with contaminants, as much as 15 to 20timesas much water goes down the drain as comes out the faucet.
Also, water flows through the RO membrane very slowly, so it can drop water pressure at the tap considerably.Most manufacturers recommend AGAINST an icemaker water supply coming from an RO system. I have been personally using an RO system on my Whirlpool crescent cube icemaker for two years now and I am tickled with the results; ice as clear and clean tasting as our drinking water, and no scale or calcium deposits.
But if you understand the risks, and the RO system doesn't drop the water pressure too low, it can be done.8-3(b) FILL SOLENOID VALVEWater fill volume is controlled by a couple of things. For one, the length of time the valve stays open, which is usually controlled by a cam in the icemaker head, which closes a switch for the proper amount of time. Aflow control washerwithin the valve adjusts the flow for variations in house water pressure. However, if the water pressure is below about 20 psi at the solenoid valve inlet, problems can occur. If the cube is too small, it may not eject properly, and the next fill may cause overfill.Water solenoids operate using a pressure diaphragm with pressure on both sides of the diaphragm.
Different icemakers require a wide variety of fill volumes, from about 3 ounces in certain GE units to as much as 8 ounces in Admiral-type machines.
The valve bodies might look the same from the outside, but you must make sure the valve is the correct one (has the correct flow control washer) for the icemaker you're working on. If someone has previously replaced the solenoid valve, and you experience low flow problems or slabbing in an icemaker, double check that the valve is the correct one. This is acriticallyimportant point.8-3(c) TESTING AND ADJUSTING FILL VOLUMETo test fill volume, remove the icemaker from its freezer wall mounting (but leave it plugged in) and initiate a harvest cycle if possible. Baby bottles are generally just about the right size for testing fill volume; most are graduated in both cc's and ounces. A good rule of thumb is that one fluid ounce equals about 30 cc's.Water fill level can be adjusted onsomeicemakers. See sections 8-5 thru 8-8 about your design.8-4 SLOW OR NO ICE PRODUCTIONThere are a number of things that will slow or stop the production of ice.
If you are working on an icemaker where you can do so, a good start is to try to manually trigger a harvest cycle and watch what happens.
However, there a few common causes.8-4(a) FREEZER TEMPERATURECheck the freezer temperature.
In most icemakers, a freezer temperature above about 15 degrees may cause icemakers not to harvest or to have other ice production problems. If the freezer temperature is hovering right around the thermostat temperature setting, the icemaker's thermostat may open and close, causing slow or intermittent ice production.
If the freezer temperature is not low enough, check the refrigerator's temperature settings.High freezer temperatures may also mean that therefrigeratorhas cooling problems such as defrost or sealed system malfunctions.

If adjusting the controls doesn't lower the freezer temperature, see Chapters 4 and 5.8-4(b) POWER SUPPLYCheck that the icemaker is getting power. Unplug it from the freezer wall socket and see if you have power between at least two of the terminals.8-4(c) WATER SUPPLYCheck also that the icemaker is getting water.
If possible, unmount the icemaker from the freezer wall and manually initiate a harvest cycle.
The electronic one has a circuit board and an on-off rocker switch on the right side of the icemaker head.Most of the symptoms and the malfunctions between the three designs are similar. However, the internal differences between them are pretty pronounced, so testing and troubleshooting are quite different.8-5(a) MODULAR CRESCENT CUBE DESIGN OPERATIONThe harvest cycle on these icemakers is thermostatically triggered.
Very shortly thereafter, a cam on the drive shaft closes the holding switch, keeping the motor circuit energized even after the thermostat opens back up. The motor then stalls, with the ejection fingers applying pressure to the ice, until the mold heats up enough for the cubes to separate from the mold. If the ice level in the bin is too high, or if you raise the arm to the shutoff position, this switch opens and interrupts the thermostat circuit.
The icemaker then will not enter a harvest cycle until the sensor arm is allowed to return to its full down position.
During the harvest cycle, a cam raises the sensor arm and opens the shut-off switch, but the holding switch keeps the motor turning. There is an adjustment screw on the right side of the icemaker head; one full turn equals 40cc's.
Some models have water level adjustment dials on the right side of the plastic icemaker head cover that attach to this screw. This screw simply moves the fill switch closer to the cam on the drive shaft, keeping it open longer, or vice-versa.
The maximum adjustment on these machines is one full turn in either direction; any more will damage the icemaker head. When adjusting the level, do it gently and do not attempt to force it AT ALL.TROUBLESHOOTINGAside from water supply problems, what usually goes wrong with these machines is that the thermostat (bimetal) fails. To jump the thermostat and trigger a harvest cycle, just jumper between the T and H test point holes. In this case, you would see the ejection fingers pressed against the ice, trying to eject it, but it would not eject. Under power, test for line voltage between the L and H test point holes; if it is energized, then power is going to the heater. Unplug and test for resistance between the same test points; the heater should test 72 ohms. If not, replace the mold.If the drive motor isn't turning at a time when it should be, test for 110 volts between L and M to see if the motor is energized. Some have water level adjustment dials on the right side of the plastic icemaker head cover.The harvest cycle on these icemakers is thermostatically triggered. Very shortly thereafter, a cam on the drive shaft closes the holding switch, keeping the motor circuit energized and turning even after the thermostat opens back up. The fingers then continue pushing the ice out of the mold.The thermostat stays closed throughout the first rotation of the ejection fingers. Near the completion of the first rotation, another cam attached to the driveshaft closes the fill switch, butwater fill does not occur. The shutoff switch is closed, and offers a lot less resistance than the water valve circuit. Near the completion of the second rotation, the fill switch closes again for about 7-8 seconds, and this time the mold fills with water. During the harvest cycle, a cam raises the sensor arm and opens the shut-off switch, but the holding switch is still closed, which keeps the motor turning. When you remove the plastic cover, you will see the motor gear turning and disengaged from the larger ejection drive gear.
The motor gear can be pressed back on and glued with superglue.Some of these machines have a "chiclet"-type thermal fuse (figure X-8) attached to the underside of the ice mold, near the icemaker head. If this fuse blows, the icemaker will not harvest, nor will the motor start when you try to manually initiate a harvest cycle. The other two microswitches are the waterfill switch and the holding switch, both cam-operated. Fortunately, they're pretty much commodity items at this point, and can be replaced for well under a hundred bucks.8-6 GE "BULLET" OR "BARREL" CUBE MACHINESThese machines produce five cylindrical cubes per harvest. If there is an ice dispenser in the door, you may need to turn down the crescent cube size a little to get the cubes to go through the door properly.OPERATIONThe harvest cycle begins thermostatically at about 16 degrees. An ejection shaft through the bottom of the ice mold is attached to an ejection pad, which pushes the cubes vertically from the mold.
During the harvest cycle, the mechanism raises the sensor arm and opens the shut-off switch, but the holding switch keeps the motor turning.
The icemaker will not be producing ice, and you're sure the freezer is cold enough, but manually jumping the thermostat produces a harvest.There are two test connections on the underside of the icemaker head.
In both, a small rectangular plug in the bottom of the icemaker head can be removed to reveal two small holes.
When the harvest cycle is initiated, it takes about eight minutes for the tray to rotate completely around and refill. Above 19 degrees, it will not produce ice at all.You can tell if the motor is turning by looking at the end of the motor shaft as shown on the illustration.
There is an adjustment screw on the right side of the head, but the factory glues it in place during construction.
In fact, the factory doesn't want you messing with these machines at all; if they malfunction, the solution is to replace them.
I have had a couple of these icemakers apart and I'd have to agree with the factory in this case. After you replace your old one, try pulling it apart and reassembling it and you'll see what I mean.A conversion kit is available to convert the refrigerator to a crescent-cube design, and I would highly recommend it. Instructions will be included in the conversion kit.During the harvest cycle in this design, the twisting action of the ice tray ends with a relatively violent SNAP! Over time this can have several adverse effects.The icemaker can begin to pull its wall mounts out of the freezer wall. Cubes on the high side of the mold may be too small, while cubes on the low side may be too large or even slab together, and fail to eject.The plastic mold (tray) can crack, especially around the hub. If it is, there are a number of things that could be causing the icemaker to stop making cubes, but the solution to all of them seems to be to throw a new gear and pin set in both the front and back of the icemaker head. Gear alignment instructions are included with the new gears.There is no way to manually initiate a harvest cycle in these machines.
When you replace and realign the gears and reinstall the icemaker, it will immediately enter a harvest cycle and fill with water.Time only accumulates on these icemakers when the cold control (the refrigerator's thermostat) is closed and the compressor is running. If the doors remain closed, the ambient air temperature (outside of the fridge) is low, and the compressor doesn't run much, you may experience low ice production.
Thus, the icemaker must be plugged in at all times, even if it's not being used to make ice. If you no longer use the icemaker and wish to remove it from your machine, a module is available that replaces the icemaker with a smaller "box" unit that just performs the defrost function.

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