High Pressure Switch Replacement - STK0074 alternative?

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OolDad

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Oct 28, 2022
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Hi, I've got a high-pressure switch in my Aquacal Heatwave SQ110 with a damaged wire. The correct replacement part according to Aquacal is STK0074, though the original was RES0018, but I've had trouble sourcing the replacement part. This part is the same one used to replace the switch in newer models too.

It's 600CO / 445 CI. Any idea what part I can use in it's place? I found some various switches on Amazon that are similar but not 100% a match, but wondering if there is a known / preferred solution for this.
 
High Pressure Control with ±15 PSI Tolerance (Open 600 PSI/Closed 475 PSI)
Brand: Packard
SKU: PHP600475

Note: The Description says "Open on pressure fall", but I think that it is open on pressure rise. Confirm to be sure.

Description
–
High Pressure Control with ±15 PSI Tolerance (Open 600 PSI/Closed 475 PSI)

Features:
High pressure SPST open on pressure fall
Temperatures: Ambient 20°F to 176°F (-30°C to 80°C). Fluid 60°F to 250°F (-50°C to 120°C)
Rated Voltage: 50/60 Hz, 24/120/240 Volts (6 RLA, 36 LRA)
Life at rated load: 100,000 cycles
1/4" SAE female flare fitting with valve core depressor
Snap acting stainless steel hermetically sealed sensor (SHP, SLP, and SFC)
Small size and light weight for direct mounting
Excellent set point repeatability/stability
Pressure range: 0 to 650 PSI
Burst pressure: 5000 PSI


AquaCal 600CO-445CI HIGH PRESSURE SWITCH & TEE (R410A) - INYOPools.com

600CO-445CI HIGH PRESSURE SWITCH & TEE (R410A) - Pool & Spa Parts
www.inyopools.com www.inyopools.com
1744730377394.png
 
Last edited:

Pressure Switch, Open at 600 PSIG
Brand: Johnson Controls
SKU: P100CP-165C

Setpoint: Opens at 600 psig, Closes at 475 psig.
Switch Action: Open on Pressure Rise

The P100 Series Encapsulated Pressure Controls are compact, economical, direct-mount, snap-action, On/Off pressure controls, available in a wide variety of factory-calibrated, non-adjustable pressure setpoints.

The P100 controls are designed primarily for direct or pilot duty control of motors and other refrigeration or air conditioning application loads requiring precise, repeatable pressure control over a wide range of ambient conditions.

The P100 controls are available with a variety of pressure connection styles, electrical ratings, and switch actions. A high-pressure manual reset lockout is available on some models.



610co 420ci Hi Press Switch
Brand: Supco
SKU: SHP610420

1744732281093.png


https://www.grainger.com/product/4LWY1
 
 

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mccombssupply.com

Supco SHP610420 High Pressure Switch Open: 610 PSI Close: 420 PSI HVAC Refrigeration

Shop Supco HVAC Refrigeration High Pressure Switches SHP610420. Open 610 PSI Close 420 PSI Auto Reset 1/4" Female Flare. McCombs Supply Fast Shipping!
mccombssupply.com mccombssupply.com

https://www.grainger.com/product/66DC88

Supco Part number SHP610420
Open: 610 PSI Close: 420 PSI
High pressure switch opens on pressure rise
High precision controls at economical prices. Encapsulated, non-adjustable, single pole - single throw, direct mount switches for use with HFC, HCFC, and CFC refrigerants
Features:
¼" SAE 45° female flare fitting with valve core depressor
High pressure switch opens on pressure rise
Life at rated load: 100,000 cycles
Automatic Reset
Rated Voltage 24/120/240 VAC @ 50/60 Hz
Snap acting stainless steel hermetically sealed sensor
Wire is 18 AWG, 18" long
Small size and light weight for direct mounting
Excellent set point repeatability/stability
 
@OolDad, your profile reports your location as Florida. (A fine state …it’s not Texas, but a fine state indeed.)

Anyhow the data @JamesW has pointed out appears to jive with my thinking. It’s a high pressure cutout switch. Any HVAC supply house should have them available locally, as they are a basic part of the safety circuit on air conditioners these days and go out from time to time.

For the Florida specific part - Baker Distributing is the big HVAC supply house in the florida market if my memory serves. Go throw that part up on the desk and ask them for a new 600/445 HP cut out switch. Any supply house should be able to get one for you. (The flare fitting probably isn’t as common as the brazed in one, but they’re not uncommon. Try not to go higher on the cut-out PSI rating, but you have a little wiggle room on the cut in pressure if you need to get by in a pinch and can’t find a direct replacement.)

Or you can order from supplyhouse.com. I order from them pretty regularly and they are fast (which is saying something given my location at the end of the world.)

If all else fails, call a favorite HVAC tech. Tell him you have a cutout switch that needs to be replaced in a heat pump circuit. He may darn well have one on the truck and can swap it for you on the spot.
 
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Also, you didn’t really mention how badly the wire was damaged. If it’s back to the potting, then you’re probably better off swapping the part, but if it is just the wire having rubbed through the insulation 4 inches away from the switch, just cut the bad part out and splice it back together with whatever you’ve got on hand. You’re working with 24V, so its pretty idiot tolerant. I can’t tell you how many A/Cs I’ve seen that seem to be wired with a combo of bubble gum and weasel spit.
 
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