SL321R030 - ECM REPAIR KIT + LABOR
SL321R030 – ECM REPAIR KIT + LABOR
This listing is the repair, not just the thermistor. The inrush limiter is the round black disc on an ECM control module that takes the surge every time the motor powers up, and it is the component that most often fails open and leaves you with a motor that hums but never starts. Swapping the disc is a $5 part and a soldering job; a new control module is several hundred. Bring us the module and we do the swap. If you would rather do it yourself, verify the disc is open with a meter before you order - a shorted module or a burned trace will not be fixed by a new limiter.
10226 Plano Rd, Suite 104, Dallas TX 75238
Questions? Call or text (214) 340-9421
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
Symptoms of failure
- Blower motor hums but never starts
- Motor tries to start, then the module goes dead until you cycle power
- No LED activity at all on the control module
- A round black disc on the module board is cracked or burned
- Motor works when cold, quits after the system has been running
- Module reads open across the inrush limiter with a meter
Seeing these does not always mean this part is the culprit. Bring the old one in and we will meter it at the counter, free, before you buy.
ECM motor repair kit. No manufacturer-published literature was found for this part number, so its contents, compatible motor families and electrical ratings are not stated here. Confirm the kit matches your ECM motor and control module before ordering.
Specs
- BrandAmetherm (Vishay)
- Part NumberSL32 1R030
- TypeInrush current limiter (NTC thermistor)
- Resistance1 ohm +/- 20% at 25 C
- Max Steady-State Current30 A
- Max Recommended Energy160 J
- Body Diameter32 mm
- LeadsStraight
- SeriesSL32 bigAMP
- Sold AsBench repair - part plus labor
Installing it yourself
- Kill power and confirm 0V. Let the module sit five minutes - the bus capacitors hold a dangerous charge after the power is off.
- Pull the control module off the motor end bell and open the potting shell.
- Meter across the inrush limiter. Open means it failed; a reading near 1 ohm means the limiter is fine and the fault is elsewhere.
- Desolder the failed disc, clean the pads, and check the surrounding traces for heat damage before fitting the new one.
- Solder the replacement in with the leads at the original spacing so the body cannot touch adjacent components.
- Reassemble, refit to the motor, and run a full cycle. If you would rather not solder, bring us the module and we do the swap on the bench.
Power off at the disconnect first, every time. Not sure partway through? Bring it to the counter and we will walk it with you.
Is a 1075 RPM motor different from an 1100 RPM motor?
No. Both are 6-pole motors with a nominal speed of 1200 RPM, and the published number is just each manufacturer's rating convention. Anything in the 1050 to 1140 range is the same speed class. Pole count is what actually matters: 2-pole is nominal 3600 (published 3200 to 3450), 4-pole 1800 (1625 to 1750), 6-pole 1200 (1050 to 1140), 8-pole 900 (800 to 850). Swap a 6-pole for a 4-pole and you have a different motor entirely. Do not chase 25 RPM.
Can I put a PSC motor in place of an X13 or a variable-speed ECM?
Not as a straight drop-in. An X13 is a constant-torque motor that takes 24 volt signals on tap terminals instead of speed leads. A variable-speed ECM holds a target CFM by ramping against the static pressure it sees. A PSC has no idea what static pressure is, so you pick one speed tap and live with it. On a duct system pulling 0.8 inches water column of total external static, a PSC will not give you the airflow back. Genteq Evergreen style ECM replacements exist, but they still have to match frame, shaft and rotation.
What has to match besides horsepower?
Frame size, shaft diameter and length, rotation, mounting style, voltage and the run capacitor rating. A 48 frame motor is 5-1/2 inches across the body, a 42 frame is 5 inches. Keep amp draw within about 5 percent of the old nameplate, and never step horsepower DOWN.
Do I need a new capacitor with a PSC blower motor?
Yes. The new motor's nameplate tells you the microfarad it wants, and a weak capacitor is what killed a fair number of the motors that come across our counter.
- In Stock
TruelineW51-12BJA3-02 - BLOWER MOTOR - AIR HANDLER (1/2 HP, 240V, 10MFD)
SKU · 19L38$152.61View details → - Low Stock
Packard46013 - EC MAX MOTOR
SKU · 46013$300.89View details → - In Stock
TruelineW51-13BAA3-02 - BLOWER MOTOR - FURNACE (1/3 HP, 120V, 10MFD)
SKU · W51-13BAA3-02$140.56View details → - Low StockPackard
46001 - EC MAX MOTOR
SKU · 46001$342.19View details →
