Boiler Reset Control It doesnt have to be

Boiler Reset Control It doesn’t have to be complicated!

Your Customers’ #1 Concern! • Energy efficiency – Cars – Lights & appliances – Home heating • What about boilers? – Replace? – Improve?

Some Basics… • Heat loss – Size for “coldest day” – < 3% of heating season – Install for “coldest day” • Heat loss varies – ↑ as it gets colder – ↓ as it gets warmer

More Basics… • Heat supplied must = heat lost – Boiler is one size – Heat emitters one size • How do we keep from overheating? – Fewer BTU’s needed – Shorten run time

Still More Basics… • Short-cycling – – – Shortens run-fraction Kills cycle efficiency More wear & tear Greater standby losses Inefficient operation • Stop & go city driving

Add Boiler Reset! • Matches boiler output to heating load – Automatically adjust boiler temp – Colder out – hotter water – Warmer out – cooler water • ↓ boiler temp – use less fuel – Reduce standby losses – Reduce losses to unheated spaces • Conservative savings estimate: – 5 to 15% for CI, non-condensing boiler

5 to 15%? That Ain’t Much… • Or is it? • Older home using 1, 200 gallons/yr – Split the difference – call it 10% – Save 120 gallons • At $3. 75/gallon – that’s $450. 00 savings! • A good investment?

So, What’s Involved? • Taco PC-700 & EXP relay – E-Z installation – E-Z wiring – E-Z programming

How Does It Work? • Calculates required boiler temp based on weather, programming • Tells boiler when to fire & target temp • Monitors differential – Prevents short-cycling – Automatic adjust • “Partial” reset – non condensing boilers

Problem… • • 3 zones w/indirect 7 year old boiler Gas conversion - $9 K Homeowner goal: use less fuel, save $$ • Easy reset!

Here’s What We Have: Control for 3 heating zones + DHW priority Using SR 504 A Priority On

Boiler Reset Made Easy • Option 1: – Keep SR 504 – Add SR 501 -EXP relay – Add PC-700 Boiler Reset control • Option 2: – Dump SR-504 – Add SR 504 -EXP – Add PC-700 Boiler Reset control

T T Option 1

Option 2 T T A

Plug-In Power Port Cards • PC-600 – Post Purge Timer • PC-605 – Priority Protection • PC-610 – Pump Exercise Min: 10 seconds Max: 7 Minutes

Installing The Sensors • Boiler sensor: – 1 Boil – 3 Com • Outdoor sensor – 2 Out – 3 Com

The Boiler Sensor • Strapped to piping – not too tight! • Insulate for accuracy • Downstream from an elbow

The Outdoor Sensor • • Flush mount or electrical box North facing wall (usually) Out of direct sunlight Away from dryer vent, etc • Above snowline!

Programming • Two menus – View – Adjust • Three buttons – Item – Up/Down arrows

The View Menu • • • Press Item button to scroll Startup Outdoor Temp Boiler Target

Programming Made Easy! • PC-700 factory programmed! • Settings for typical Northeast US system

The Adjust Menu • • BOIL Start OUTDR Start BOIL DSGN OUTDR DSGN BOIL MIN DIFF WWSD Units

Reset Myths • Reset can’t be used with Cast iron/non-condensing boilers… • Reset can’t be used with indirect water heaters… • You need an engineering degree to figure ‘em out… • Reset’s not worth the $$$. . . • Can’t use reset with baseboard…

Baseboard Ratings Sterling Slant/Fin