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CALL 800-876-0036
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CALL 800-876-0036 Water Heating and Mixing
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Fix That Bulky, Leaking Storage Tank for Good Replace it with the Armstrong instantaneous steam water heater. For up to 8,700 gallons (32.9 m3) per hour instantly—and none of the headaches of patching up a run-down storage tank system.
This constant on/off, on/off cycling can wear out the thermostatic element. And since it fails open (hot), it could flood the outlet with scalding water. Another problem: Modulating steam pressures (due to thermostatic control) may cause drainage problems. And that could lead to damage from water hammer and tube bundle corrosion if your system isn’t trapped properly.
Why other systems fall short Leaking. Corrosion. Ruptured thermostatic controls. Plugged and leaking tube bundles. Big storage tank systems like those usually found in hospitals and institutions, industrial plants, schools, universities and like facilities are often a string of maintenance headaches.
Water Heating and Mixing
These feedback units operate by sensing the temperature of water, using a temperature-sensing device in the tank to feed back instructions to the steam control valve. Because they respond to what has already happened, feedback systems are reactive. In other words, a step behind demand. Although they can supply a large volume of water, bulky tank systems are slow to recover, waste energy to heat unused water and use up lots of floor space. Maintaining a leaky tank is difficult and expensive. And replacement? Usually impossible without tearing out walls. Tankless instantaneous feedback systems (shell and tube heat exchanger with a temperature regulator) operate just like tank systems. They do save space since there’s no tank. But the slow response time of the temperature sensor (mounted in the outlet piping) makes control on tankless feedback units highly inaccurate. The result? Thermal lags and wide temperature swings.
The Armstrong Flo-Rite-Temp™ gives you everything you want and none of what you don’t You’ll get up to 8,700 gallons (32.9 m3/.063 m2) of hot water per hour—instantly. Better yet, you’ll get it without all the things you don’t want and don’t need. • No maintenance nightmares • No bulky, leaking storage tank with standing water • No thermostatic control to rupture • No danger of scalding (fails closed or cold) • No delays or temperature swings • No squandered floor space • Requires only 7 square feet maximum • No wasted energy • No retrofit hassles: – Fits through standard doorway – Requires no external power source – Mounts easily on the floor or wall or hangs from the ceiling • No Legionella worries Long story short: With the Flo-Rite-Temp, there are no disappointments. Heat water as you need it. Consistently. Reliably. With lower installed costs, less maintenance and saved space compared to typical tank systems.
All feedback systems share a major drawback A serious weakness of both types of feedback systems is their thermostatic control. A typical domestic hot water system is under demand only 10% to 20% of the time. During the majority of its no-load service life, however, the unit’s thermostatic feedback system is continually cycling on to reheat water that has cooled through radiation— wasting energy (in tank systems) 80% to 90% of the time.
High-maintenance feedback systems with bulky tank units like this one often leak, corrode or rupture a thermostatic control. 268
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Armstrong Hot Water Group, 221 Armstrong Blvd., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 279-3600 Fax: (269) 273-8656 www.armstrong-intl.com
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™ How Feedback and Flo-Rite-Temp Systems CALL 800-876-0036 React to Changing Demand 1 Feedback System: Enters on/off cycling mode, causing wear on thermostatic device. Condensate drainage becomes critical due to lack of differential pressure. May lead to corrosion and water hammer. Flo-Rite-Temp Feed Forward Design: Maintains accurate temperature control with no cycling. Assures condensate drainage due to constant steam pressure.
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3
2 Feedback: Falls behind as demand increases, leads to thermal lag. Flo-Rite-Temp: Responds instantly to increased demand to maintain accurate temperature control.
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3 Feedback: Slow response to sharp decrease in demand creates high temperature spike. Flo-Rite-Temp: Adjusts instantly to maintain accurate temperature output.
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12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 AM
Time in hours
PM
This graph profiles hot water demand over a 24-hour period and explains how the two systems react to various demand levels indicated by the numbers.
4 Feedback: Would eventually run out of hot water if demand were to continue at this level. Flo-Rite-Temp: Has no storage tank to run dry. Supplies full-capacity output with no shortages. 5 Feedback: Stabilizes after time and again enters on/off cycling mode. Flo-Rite-Temp: Reacts instantly, assuring accurate temperature control.
Water Heating and Mixing
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Typical Daily Water Flow
The Armstrong Flo-Rite-Temp can easily do the work of a storage tank unit many times its size— at lower installed cost and with minimum maintenance. Even the largest capacity Flo-Rite-Temp requires only 7 square feet (0.63 m2) of floor space. 269 Armstrong Hot Water Group, 221 Armstrong Blvd., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 279-3600 Fax: (269) 273-8656 www.armstrong-intl.com
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800-876-0036 Why the ArmstrongCALL Feed Forward Design Gives You a Head Start in Performance, Maintenance and Savings The Armstrong feed forward design eliminates the troublesome temperature regulator and uses a differential pressure diaphragm valve to regulate flow and control temperature. The valve teams up with a shell and tube heat exchanger to complete the system. The idea is simple: Overheat water in the heat exchanger and then blend it (as needed) with proportional amounts of cold water to achieve the correct outlet temperature for a wide range of flows. There’s no storage tank or potential health hazard posed by standing water. Gives you a jump on peak demand periods. The differential pressure diaphragm acts immediately upon a change of demand so there’s no lag time. You get all the hot water you need—up to the unit’s capacity—instantly. What’s more,
if the diaphragm fails, a spring returns the valve to a closed position (cold), so there’s no danger of scalding by accident. Makes maintenance a straight, easy shot. Virtually everything about the design and operation of the Flo-Rite-Temp reduces maintenance. (See below.) For starters, the tubes inside the carbon steel shell are straight for easy mechanical cleaning. And steam pressure in the heat exchanger is not modulated but constant, which assures condensate drainage and nixes potential water hammer and corrosion. Pushes you out front in savings. When it comes to replacing a bulky storage tank system, the choice is clear. The Flo-Rite-Temp consumes dramatically less floor space, and you don’t have to tear out walls to install it. In fact, it slips through a standard doorway. Payoff? Lower installed cost.
Water Heating and Mixing
Easy, one-time temperature adjustment
Automatic air venting
Integral mounted control valve provides rigid construction with no intermediate piping to leak
All controlling valves and moving parts see nothing but cold water— no scaling or valve fouling
Water differential demand actuated control— instantaneous, proactive temperature control—no lag time
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Armstrong Hot Water Group, 221 Armstrong Blvd., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 279-3600 Fax: (269) 273-8656 www.armstrong-intl.com
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CALL 800-876-0036 Another advantage: An energy-efficient Armstrong Flo-Rite-Temp won’t waste energy by constantly reheating stored water. You can even insulate the heat exchanger shell for greater savings. Heat it as you need it. Match your capacity needs with one of the four models of Armstrong’s Flo-Rite-Temp instantaneous water heaters. For an application overview or tech assistance in selecting and installing, contact your Armstrong Representative today.
How Flo-Rite-Temp Scores on Key Benefits
Saves space Saves energy Eliminates temp. swings Eliminates thermal lag Assures accurate control Designed with straight tubes for easy cleaning Eliminates potential health hazard of standing water Fails cold for safety Eliminates thermostatic control
Flo-Rite-Temp Storage Tank Tankless Instantaneous Feed Feed Back Forward Feed Back Yes No Yes Yes No Yes Yes Yes No Yes Yes No Yes Yes No Yes
No
No
Yes
No
Yes
Yes Yes
No No
No No
Water Heating and Mixing
Straight tubes for easy cleaning and easy removal
Removable end cover allows easy cleaning and 100% visual tube inspection
Constant steam pressure means positive condensate removal and no more corroded, ruptured bundles
Floating head reduces tube stress
271 Armstrong Hot Water Group, 221 Armstrong Blvd., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 279-3600 Fax: (269) 273-8656 www.armstrong-intl.com
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Water Heating and Mixing ID Charts Flo-Rite-Temp™ Illustration
Type
Fluid
Flo-Rite-Temp Steam to Water Instantaneous Water Heater (Single-Walled Exchanger)
Connection Type NPT
NPT
NPT NPT
Steam and Water
NPT
Water Heating and Mixing
Flo-Rite-Temp Shell and Tube Steam to Water Instantaneous Heat Exchanger
Carbon Steel Shell with Admiralty Brass Tube Bundle (Heat Exchanger)
150 psi (Steam)
Bronze (Valve)
665 8120 415DW 535DW
Carbon Steel Shell with Copper Tube Bundle (Heat Exchanger)
225 psi (Water)
NPT (Water) ANSI 150 (Steam) NPT
225 psi (Water)
375 NPT
8120DW
225 psi (Water)
Connection Size 1" Water 2" Steam 1-1/2" Water 2-1/2" Steam 2" Water 3" Steam 3" Water 4" Steam 1" Water 2" Steam 1-1/2" Water 2-1/2" Steam 2" Water 3" Steam 3" Water 4" Steam
125
2" Water
15
3" Steam
665 SS 125
2" Water
15
4" Steam
225 150 225 150 225 150 225 150
1-1/4" Water 2" Steam 1-1/2" Water 2-1/2" Steam 2" Water 3" Steam 3" Water 4" Steam
Atmospheric
1"
8120 SS
442ST
Cast Iron (Stainless Optional) (Head) Carbon Steel Shell with Admiralty Brass Tube Bundle (Stainless Optional) (Heat Exchanger)
150 psi (Steam)
NPT
Steam and Water
665DW
316 Stainless Steel (Valve) Carbon Steel Shell with 316L Stainless Steel Tube Bundle (Heat Exchanger)
300
NPT (Water) ANSI 150 (Steam) Clean-In-Place Scale Removal System
535
225 psi (Water)
150 psi (Steam)
NPT Steam and Water
415
Bronze (Valve)
300
NPT (Water) ANSI 150 (Steam) Flo-Rite-Temp Steam to Water Instantaneous Water Heater (Single-Walled, All Stainless Steel Wetted Parts)
Max. Oper. Press. 125 15 125 15 125 15 125 15 125 15 125 15 125 15 125 15
Model
300
NPT (Water) ANSI 150 (Steam) Flo-Rite-Temp Steam to Water Instantaneous Water Heater (Double-Walled Exchanger)
Body Material
150 psi (Steam)
NPT
Steam and Water
Max. Allow. TMA °F Press.
552ST 662ST 862ST
Teflon Coated Cast Iron (Pump) Rite-Qwik Scale Solvent
Atmospheric
NPT
140
CIP
Polypropylene (Tank) PVC (Pipe & Hose)
Flo-Direct ® Illustration
Type
Fluid
Flo-Direct Direct Fired Water Heater
Natural Gas and Water
Conn. Type
NPT
Body Material
Model
Gas Conn.
Water Conn.
1500
1"
1"
3000
1-1/2"
2"
5000
2"
2-1/2"
7000
2"
3"
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Stainless Steel
Balancing Valves
Illustration
Type
Body Pattern
Conn. Type
Max. Allow. Press. psig
TMA °F
Body Material
Model
Max. Oper. Press. psig
1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
Connection Size
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ABV-S Balancing Valve
Straight
Sweat
250
250
Bronze
ABV-S
250
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ABV-T Balancing Valve
Straight
Threaded
250
250
Bronze
ABV-T
250
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2-1/2"
3"
4"
5"
6"
8"
10" 12"
ABV-G Balancing Valve ABV-A Balancing Valve
Straight
Angle
Grooved ANSI 125 ANSI 250 Grooved ANSI 125 ANSI 250
375 250 375 375 250 375
230
Ductile Iron
ABV-G
230
Ductile Iron
ABV-A
375 250 375 375 250 375
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Armstrong Hot Water Group, 221 Armstrong Blvd., P.O. Box 408, Three Rivers, MI 49093 – USA Phone: (269) 279-3600 Fax: (269) 273-8656 www.armstrong-intl.com
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