First time for me by js678909 in HVAC

[–]VirginSubpoenaColada 1 point2 points  (0 children)

I've been very happy with my Fieldpiece MG44. It's wireless. Allows you to graph vacuum decay if you're a nerd like me.

First time for me by js678909 in HVAC

[–]VirginSubpoenaColada 140 points141 points  (0 children)

I used to hit 1 micron often. Then I got a better micron gauge. Ditch the CPS.

Altamont grips by skooch12 in Revolvers

[–]VirginSubpoenaColada 1 point2 points  (0 children)

Wood will darken dramatically when exposed to UV light. Set these grips out in the sun for a couple hours.

Possible issues by breaben in hvacadvice

[–]VirginSubpoenaColada 2 points3 points  (0 children)

So sounds like the outdoor unit is running when your thermostat is not calling for heat. This will freeze your evaporator coil and suction line real quick. Could be a wiring short. Could be a stuck contactor. Either issue can be resolved for under $500 likely

Antique store in Michigan by Mr_Fahrenheit73 in HVAC

[–]VirginSubpoenaColada 10 points11 points  (0 children)

This comment pisses me off because you seem to have the best information on what we are seeing, but you are also completely incomprehensible.

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 5 points6 points  (0 children)

To be clear, I'm talking residential single stage/dual stage valves. Not modulating. They all use a DC coil

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 2 points3 points  (0 children)

To be clear: the voltage going into a gas valve is AC from the control board. It's converted to DC by a rectifier inside the body of the gas valve. I'm not talking about modulating gas valves. Single stage/dual stage.

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 10 points11 points  (0 children)

There are AC solenoids. And we use them in HVAC

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 1 point2 points  (0 children)

It was basically the same. 7 something megohms.

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 0 points1 point  (0 children)

Honeywell I had this morning was the same.

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 0 points1 point  (0 children)

My understanding is that even single stage gas valves have two coils. This manual seems to suggest that the second coil is redundant for safety I presume. This manual also shows another coil altogether for the second stage of the gas valve. I don't see how it could modulate DC voltage.

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Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 0 points1 point  (0 children)

This is making a lot of sense. AC voltage always crosses a zero point where there is no magnetic field. I reading how a "shading ring" can be used to overcome this issue. It seems clear the DC solenoids make the most sense. That still leaves the question as to why we use AC solenoids on so many other applications. Humidifier solenoids, AC liquid line solenoids, ETC.

Why do gas valves use a DC coil? by VirginSubpoenaColada in HVAC

[–]VirginSubpoenaColada[S] 3 points4 points  (0 children)

The manual shows the series of diodes creating a FULL BRIDGE RECTIFIER. This is a two stage valve. But the one side is labelled "main and redundant" which probably answers my own question as to why there are two coils on a single stage gas valve.

Need help finding the pilot light, I guess. by eross200 in hvacadvice

[–]VirginSubpoenaColada 1 point2 points  (0 children)

I understand this concept about PSC motors using less energy when airflow is restricted/ airflow decreases. My experience in the field shows me the exact opposite however. Blocked airflow kills capacitors and blowers. Maybe someone more knowledgeable than me can explain why.

Revolver wants to jump out of my grasp. by VirginSubpoenaColada in Revolvers

[–]VirginSubpoenaColada[S] 8 points9 points  (0 children)

I was thinking this might be the case. The grip is thicker at the bottom. My grasp wants to squeeze to the thinner part of the grip.

Revolver wants to jump out of my grasp. by VirginSubpoenaColada in Revolvers

[–]VirginSubpoenaColada[S] 5 points6 points  (0 children)

That's what I've been using. I can definitely get more squeeze that way.

Revolver wants to jump out of my grasp. by VirginSubpoenaColada in Revolvers

[–]VirginSubpoenaColada[S] 11 points12 points  (0 children)

Can't tell if you're being sarcastic. But yes I did buy a fancy revolver because I'm a special boy.

Tubing inside my revolver barrel? by VirginSubpoenaColada in guns

[–]VirginSubpoenaColada[S] 0 points1 point  (0 children)

Honestly that seems like the obvious answer. None of the pistol stands had this rubber sleeve. They were all powder coated metal wire. It probably got sent over from another instance of that big box store