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York HDD16N09201B without nameplates, so no serial number or other info. The model number comes from a sticker on the manual. I'm guessing it's between 15 and 20 years old, but don't see many small...

Joey,
Great!
Thanks for your reply!
I'm planning to let then stay connected when the fan is running. In theory, we will be checking these periodically, and will have the opportunity to catch a...

Mechdorn, thanks for your reply.
I wasn't suggesting using any limits as controls. There are three limits - the air pressure switch, a "klixon" disc-type overheat switch, and a fatal overheat...

Sam,
Thanks for your reply.

The thrust of my original question was about whether significant leakage was likely enough, with modern, proprtionally controlled (pulsed) SCRs, that I should...

Dave CR, thanks for your reply.

I'm talking about something that goes beyond the "rated" leakage current that the shiny, new SCR allows. I wouldn't fuss about the 5 mA if it stayed there ......

Sam, Thanks for your reply.

If the proportional control voltage to an SCR is at 0V, and that SCR is delivering, say, 200 Watts to the heating element, I'd say it's leaking.

I've seen...

I'm anticipating using some Viconics 'stats to provide proportional control of some electric duct heaters. The heaters in question use pressure switches to enable them when air flow is present. As...

There was once a lot of bragging among BACnet advocates - aimed at Lon - about how BACnet packets could be transported via various and sundry network protocols. We can thank ALC for demonstrating to...

Thanks for your reply.
Right - motor-starting inrush current was what I was focused on.

I'm completely baffled by the circuit it protects, I have to say ... either one of those condenser fans...

Thanks to hvac69 and Russ57 for their replies. Better than the Bussman web site at pointing out the differences between two of their products.

In this particular case, I knew that the voltage...

Nope.

This question about cartridge fuses came up in our shop:
This "Tron" (Bussman FNQ) fuse is blown, and we don't have the right value in stock. Can I substitute this "Dual-Element" (Bussman FNM) in...

The iLon could be used as an IP/Lon router and as a front end to monitor things and to change CPs. etc. Jaces are often used in much the same way. You won't be able to use the iLon as much of a...

You don't tell us enough to even guess a set point. Something in the piping needs the flow through it controlled. What is it?

Typically, this control loop would include a VFD or a bypass valve. ...

Really! So very good to know! Now we can all start replacing our old water source heat pumps with these slick new Multistacks! I'll start right away by selecting a replacement for the 2-Ton,...

Yeah - I agree there ...
I was called in to look into noise complaints in a large law library. A Trane heat pump above the ceiling in the stacks was making horrible rattling noises. Most of it...

Your "everyone" and my "everyone" must be two different batches of people.

Sorry ... I can't get very enthused about McQuay water-source heat pumps. The "Mk IV" circuit board's interface is...

More interesting BS with the Trane WSHPs, just in case anyone is searching the forum for info. I do lots of work in a building that has the "Boilerless Controls" version. The installing contractor...

I'm trying to obtain the controls manual for the control system used with Trane SCWD units. They are very similar units to the Trane SCWC, for which the controls manual is titled: CNTRLS-IOM-1 ...

Many thanks for your response, and your generous offer. Sorry for the belated reply.

A particularly good tech in my area, who worked for Trane for a while, scans a lot of old manuals. Took a...

Looking for the IOM for an old Trane RTU ...

Model: SFCA-1003 LD
Type: 268-515-1-8
SN: 078M-17623

Even if you don't have a manual, it would be interesting to know how old it is.

If you...

This is a bit off of the HVAC topic, but something a lot of commercial building engineers & techs will have some experience with: Domestic Water Booster Pumps. I'm looking at a proposal to replace...

195*?? Hooo ...
That's gotta an efficient system, don't it. :whistle:

My apologies to Madhat ...
The animated smilies in his message didn't show up until I re-booted my computer this morning.

Har!

But I know a guy who does this. He's a Diesel mechanic. Lives out in the sticks where power is sometimes unreliable - especially in winter.

He installed a small water cooled diesel...