5.0 out of 5 stars 3. Here’s something else I get a lot of questions about: testing refrigerator and freezer compressors. The lowest resistance will be found between the run(R) to common(C). Set 02. Carefully disconnect the wires with a pair of pliers, and then remove the relay by pulling it off of the prongs on the compressor. Set 03. Source(s): https://shorte.im/a95Cp. This instructable shows how to test a PTC relay to determine whether it is… Make sure your meter is zero’d out and calibrated. Or, you need to figure out how to wire up a generic (Supco) start relay/overload combination. So you pull the relay cover off the compressor, remove the relay/overload and this is what you see. New user coupon on orders over US $4.00. With the compressor being the most expensive component in the system, it is wise to be sure that it was bad before condemning it. Compressor won't run or it is "clicking' on and off: This normally could be a bad start relay and over load for the compressor, dirty condenser coils need cleaning, condenser fan motor is not running or the compressor itself. Register in 3 easy steps, today! Not a member? I use an infrared temperature sensing gun for this. There's usually a diagram somewhere as well - make sure you can follow it and identify parts. They are ideal if you need: + a silent compressor + a high pressure compressor + have little space and/or don't need a typical shop compressor Typical fridge compressors are 100 - 300 watt units, deliver 0.7 - 1 CFM of air and can reach pressures over 500 psi. Compressors are equipped with internal overload devices which open on a rise in temperature. Here's the simple procedure I use whenever I run into one that’s ‘short-cycling’ (trying to start, clicking on/off every few seconds, or in some cases, every minute or two). If the continuity test is negative the component has failed and will need to be replaced. Can't find what … pin. Here's the simple procedure I use whenever I run into one that’s ‘short-cycling’ (trying to start, clicking on/off every few seconds, or in some cases, every minute or two). A refrigerator requires a compressor to keep the interior cold. How to Test a Refrigerator Relay Switch. (0:23) - STEP 2: Remove lower front panel from cooler. Therefore, when you remove the compressor leads (wires) from the plug to check resistance through the compressor windings, the pressure of the Freon can launch the plugs with as much as 20,000 pounds of force. Sometimes the gap leaves blade does that broke away from the main control panel. Find the PTC relay. With the multimeter set to R x 1 scale (ohms), measure the resistance between the run and start wires; start and common wires; and run to common wires. 5.0 (5) 13 Orders. This refrigerator had the compressor replaced 4 months ago and then again, one month later.” Terrible product. Taking the time to learn how to test a refrigerator start relay can help you find any problems, fix them, and ultimately save you the money you'd have to spend on a new one. //-->. When testing across the compressor terminals, first make sure all the terminals are bare, nothing connected to them and the terminals are not corroded. Refrigerator Compressor | Refrigerator Troubleshooting Diagram amperage when terminating its defrost cycle and entering the freeze In fact, the compressor might trip its thermo-overload at that: pin. Set 01. Refrigerator Overload Protector Testing Using Multi-meter Here I try to make you understood using a simple refrigerator overload protector testing troubleshooting diagram. Part no: SRF014. Find the fridge compressor and remove the plastic case that houses the starting circuitry. The compressor is the heart of the refrigerator's hermetically sealed refrigerant system. DISCONTINUED. Access to pricing and ordering You’re looking for readings in the k-ohms range. How To Test the Compressor Relay. Video explaining how to test the compressor if you have a refrigerator that is not getting cold. You will need a good ohmmeter that can be measured with one ohms up to 20 kOhm. Save 10% on 2 select item(s) FREE Shipping on orders over $25 shipped by Amazon. Then, use a multimeter to check the relay for open resistance. The compressor on my Kenmore model 106.54682300 runs for 5 sec and shuts off, comes back on in 2 min and repeats. This is done with the help of a small screws at the base of the arrow indicator. Remember, always keep to one side of the unit when working on single-phase compressors! If it’s tripped, you will read infinity (OL) between S to C and R to C, while seeing a measurable resistance between R to S. In this case, the compressor may be extremely hot to the touch. You should have an infinite OL resistance to ground. They add to a perfect 10, but I am not sure if starter coil resitance and the winding resitance should be that close. Correct Answer. “Testing is important to confirm proper operation of all three system prime movers — the compressor, the fan, and the blower,” said Jerry Edwards, manager, electric engineering and motor technology, Bristol Compressors Intl. The main purpose of a start relay is to assist and provide additional torque to start the compressor. Refrigerator Compressor Relay Starter for QP2-15 QP2-12 Universal Type Three Inserts 15 Ohm Refrigerators Accessories 5.0 Store: Alison living Store. In the case of single-phase units, the same locked rotor condition will be a witness, if the system has a start-up component. We’re dealing with electricity here; don’t mess around! 17.95 $ 17. A shorted motor will read 0 ohms across windings, to ground, or both. Exclusive HVAC eTools Either memorize the wiring or take a few pictures just to be sure you know how to put it all back together when you're done. They add to a perfect 10, but I am not sure if starter coil resitance and the winding resitance should be that close. This procedure is used also in case, if the compressor is not running when called to do so. 1 decade ago. So long as you tested with your megger between any of the three compressor terminals (wires removed) with one test lead, and with the other test lead on a good earth and got a low reading (below 1 megger ohm (ish) it should be way above this) the the compressor has took a dirt nap. Your refrigerator thermostat is the first thing you want to check when you notice a sudden temperature difference. You will need a good ohmmeter that can be measured with one ohms up to 20 kOhm. Product Sold Out. Dec 21, 2017 - (0:07) Ohm Testing a Compressor (0:12) - STEP 1: Remove (4) 5/16" lower panel screws. If it doesn't, the refrigerator won't get cool enough to preserve your food. use the OHM,s setting 2K a mid range or more reading is good . The fan should come on whenever the compressor cycles on. Locked rotor. google_ad_client = "ca-pub-2749758595940365"; Some also record and make calculations to help make the cycle more accurate. Place one probe on any terminal and then touch the other probe to each of the other two terminals. For this reason, you should learn a systematic method of diagnostics compressor. To find out Lee decided to run his own test on three of the fridges that Magnum Motorhomes sell – the Dometic CRX50, our Vitrifrigo C51i and the Chinese DC-50. If the resistances vary from each other by as much as a 1 ohm, the compressor will not run correctly. One of the many things that can make a refrigerator warm up is the compressor is trying but failing to start. Remember when removing the wires from the compressor, use a pair of insulated needle-nose pliers and keep your hands off to the side, not in front of the plug. Carefully disconnect the wires with a pair of pliers, and then remove the relay by pulling it off of the prongs on the compressor. PTC Danfoss 103N0003 – 115V (originally white ceramic, top half looking rather brown now) plugs onto the compressor and applies 6.9 Ohms (cold) across the compressor pins that measure 17.9 Ohms. In this post, I am telling you about some main and common reasons for compressor not working and about testing compressor methods. google_ad_width = 336; Some also record and make calculations to help make the cycle more accurate. Test the refrigerator defrost heating element for continuity using a multimeter. Inc. “This will help avoid operational issues generated by improperly p… Specifically, which 12 volt compressor fridge will give them the best cooling and last longest on their 12V leisure battery. Now, with the meter on the low setting R X 1 scale you should get a low reading across the terminals. This instructable shows how to test a PTC relay to determine whether it is… Repeat all the previous steps and record your findings. This Independence Day, shop from a variety of home appliances for your friends and family. US $2.57. With the system pressure lowered, it is now safer to remove the plug and test the compressor terminals directly. You can use an ohm meter to test a capacitor. To test the PTC relay in your refrigerator, unplug the fridge and remove the lower back panel so you can access the relay, which will look like a small black box with 2 or 3 wires running into it. A shorted motor will read 0 ohms across windings, to ground, or both. This condition occurs when the winding insulation of the electric motor drive leakage of electricity began compressor body. The compressor on my Kenmore model 106.54682300 runs for 5 sec and shuts off, comes back on in 2 min and repeats.