Old Peerless boiler not working

hvac_ethan

I came across this boiler unwired I was hoping someone could help me find a diagram or with the wiring it seems fairly simple. It’s a standing pilot, all there is to it is the aqua stat, gas valve, high limit, and low water cut off.

hvac_ethan

and a transformer

HVACNUT

No Rollout? No Spill Switch?

pecmsg

Before rewiring id flood the boiler and make sure its sound.

hvac_ethan

this was the only other safety I’m guessing it’s what proves the flame it’s on the end of the pilot line

Steamhead

Where is this boiler located?

Is the rest of the system intact?

hvac_ethan

boiler is located in the basement everything else is intact supposedly was running before the wiring was undone all going to a 1 junction box

Steamhead

You're going to need some professional help. In addition to hooking everything up, we need to make sure it runs safely. Tell us where you are located, we might know someone who can help.

hvac_ethan

I am the professional the help that I need is a wiring diagram

Jamie Hall

https://forum.heatinghelp.com/discussion/comment/1801602#Comment_1801602

You also need to know where to place and how to hook in at least two new safeties, since they don't appear in your list of what's there…

Steamhead

I think your best bet would be to contact Peerless. They don't have the manual for that boiler on their site, but probably have it somewhere. Go here:

https://www.peerlessboilers.com/contact-us/

EdTheHeaterMan

That is a commercial size boiler 1,050,000 BTU input. The replacement for that boiler is the Peerless 211A and that comes equipped with a number of different gas trains. As simple as a single 24 VAC gas valve and as many as six 120 VAC gas valves.

The plate indicates that this boiler was AGA approved byt no I=B=R rated, so it is quite old.

• Is this a Water boiler or a Steam boiler?
• Is the LWCO mechanical or electronic?
• Are there 2 aquastats? An operator and a High limit
• Does the High Limit Aquastat have a manual reset?
• Is there a thermostat in the occupied space?
• The item you though is a pilot proving switch is actual a gas pressure switch.
• Do you have any limit switch or fuse near the burner door at the bottom? That is called a flame roll out switch.
• Do you have any limit switch or fuse near the draft hood? That would be called a spill switch.
• Is there a circulator (or zone circulators) that need to be operated by thermostats
• Is this in a commercial building that requires special code inspections like FM or IRI? That will change the wiring requirements.

Absent the need for additional gas valves with additional safety requirements this is the bare minimum I would do for wiring the boiler for operation assuming a 24 VAC gas valve.

If there is money to be made on this job and you can convince the customer that you need to bring any new wiring up to the current standard requirements then you can get them to pay for electronic ignition and a new gas valve that does not have the pilot safety built in, you can suggest this diagram But add the spill switch and the rollout switch.

STEAM DOCTOR

https://forum.heatinghelp.com/discussion/comment/1801613#Comment_1801613

Might have trouble getting manual. Peerless was sold at some point (late 90's maybe??) and apparently they did not transfer all of their info. That's what tech support told me, last time I tried getting info on an older Peerless

EdTheHeaterMan

The next thing you will want to consider is the operation protocol.  

• Boiler maintains temperature all season at 180°
• Boiler maintains temperature based on outdoor temperature
• Boiler is cold start and only fires when there is a call for heat
• When does the circulator operate?
• Are there already zone valves in place?
• Are there any thermostats in any occupied spaces?

With the answers to these questions, you can design the most efficient operation for the application of that equipment. 

Be glad to help you with that.

Mr.Ed

mattmia2

What is the purpose of that pressure switch?

SuperTech

https://forum.heatinghelp.com/discussion/comment/1801721#Comment_1801721

i think it might be a low gas pressure shutoff switch for LP.

JUGHNE

IIRC, those gas pressure switches are manual reset.

So if you shut down the gas train for the season or whatever reason, then the low pressure switch may need to be reset.

This has prompted some nuisance service calls.