Packaged Hot Water Generating
®
Systems - Steam / Hot Water
STEAM / HOT WATER
MODELS HWG
FEATURES
A. O. Smith hot water generators are available for operation with steam or boiler
water as the energy source. They are completely assembled with components sized,
piped and checked at the factory before shipment. Generators are available in space
saving vertical or horizontal models.
CUSTOM UNIT AVAILABILITY - Custom units built to order, with tank capacities
up to 12,000 gallons, with special control trim, and with special heating units can
be built to design specifi cations on special order basis. Standard units listed inthis
brochure cover most standard orders.
INSULATION AND JACKETING - The HWG systems meet or exceed the thermal
effi ciency and or standby loss requirements of the U.S. Department of Energy and
current edition ASHRAE/IESNA 90.1.
CODE LISTING - The standard system will employ an ASME”HLW” code glass-
lined storage tank fi tted with an ASME “U”code 3/4” diameter copper tube heat
exchanger.
HWG MODELS
INTEGRAL PUMP - The standard HWG system will employ an integral bronze
circulator pump. The standard heat exchanger sizing tables are also based on using
integral circulators.
HWG OPTIONS (STEAM OR WATER BOILER UNITS) - Low water cutoff,
alarm horn, 11x15 vessel manway, 4x6 vessel hand hole.
STEAM UNITS - Standard steam trim consists of temperature control valve, inlet
and auxiliary steam traps, inlet and auxiliary strainers, steam pressure gauge with
siphon, vacuum breaker and air vent.
OPTIONAL STEAM TRIM - Includes steam pressure reducing valve, electric high
limit safety system, pilot operated controls, pneumatic controls.
BOILER UNITS - Standard boiler water trim includestemperature control valve and
boiler water temperaturegauge.
OPTIONAL BOILER TRIM - Electric high limit safety system,
three-way controls with bypass and boiler water pump. ASME RATING - Standard
HWG consists of ASME HLW Code storage tank rated 125 psig working pressure with
U Code heat exchanger, temperature & pressure relief valve, temperature & pressure
gauge in tank, drain valve and lifting lugs.
CATHODIC PROTECTION - Standard HWG systems employing glass, cement or
epoxy lined tanks are fi tted with magnesium anodes as cathodic protection.
LIMITED WARRANTY OUTLINES
GLASS-LINED, CEMENT, EPOXY:
fi rst fi ve years, under the terms of the warranty, A. O. Smith will repair or replace the
tank; installation, labor, handling and local delivery extra.
If the tank should leak any time during the
U
THE COIL HAS A ONE YEAR LIMITED WARRANTY.
NOTE: THIS OUTLINE IS NOT A WARRANTY.
consult the written warranty or A. O. Smith Water Products Company.
August 2014R
For complete information,
Page 1 of 4
AOSCG40000
Packaged Hot Water Generating
®
Systems - Steam / Hot Water
TO SPECIFY HWG SERIES PACKAGE WATER HEATER:
1. Calculate storage capacity in gallons required, and determine if vertical or horizontal installation applies.
2. Decide what type of heating medium will be used; steam or boiler water.
• If STEAM - Determine pressure in coil.
• If BOILER WATER - Determine available boiler water temperature.
3. From the recovery table, obtain the required GPH capacity and temperature rise. Selecting heating coil size.
4. Decide whether single or double wall coil is required.
EXAMPLE INSTALLATION REQUIREMENTS:
Vertical, 140 gallons, Steam @ 5 PSIG, 80 GPH Recovery, 40 - 140°F temperature rise.
TO DETERMINE THE HWG SERIES MODEL:
Storage Tank ................................. 140 Gallons, Vertical
Coil Size ........................................ 4-18 (from RECOVERY CHART)
MODEL TO SPECIFY:
HWG - 140 V ES S 4-18
Heating Coil Size
S = Steam, W = Water
S = Single Wall, D = Double Wall
V = Vertical, H = Horizontal
Gallons
Table HWG-1 GALS./HR RECOVERY (BASED ON CIRCULATING TANK)
STEAM PRESS COIL SIZES (DIA.-LENGTH)
IN COIL (PSIG)
40 - 140°F
50 - 140°F
60 - 140°F
0 72 164 320 508 788 1080 1640 1980 2240 2440 3320 4080
5 83 190 370 588 912 1250 1898 2292 2593 2824 3843 4723
10 90 205 400 635 985 1350 2050 2475 2800 3050 4150 5100
15 96 218 425 674 1046 1434 2177 2628 2974 3239 4407 5416
20 104 236 460 730 1133 1553 2358 2846 3220 3508 4773 5865
0 78 179 349 554 859 1177 1178 2158 2442 2660 3619 4447
5 89 203 395 627 973 1334 2025 2445 2766 3013 4100 5039
10 97 222 433 687 1066 1461 2218 2678 3030 3300 4490 5518
15 105 239 466 739 1147 1571 2386 2881 3259 3550 4831 5936
20 110 251 490 777 1206 1652 2509 3029 3427 3733 5080 6242
0 87 198 386 613 952 1304 1980 2391 2705 2946 4009 4927
5 99 225 438 696 1080 1480 2247 2713 3069 3343 4548 5590
10 107 243 474 753 1168 1601 2431 2935 3321 3617 4922 6049
15 115 262 511 812 1259 1725 2620 3163 3578 3898 5304 6518
20 122 278 543 862 1338 1833 2784 3361 3802 4142 5636 6926
4-18 4-36 6-24 6-36 6-54 8-42 8-60 10-42 10-48 12-36 12-48 14-42
ESS = Single Wall Steam
EDS = Double Wall Steam
ESW = Single Wall Water
EDW = Double Wall Water
Table HWG-2 G.P.H. RECOVERY WATER-WATER (CIRCULATING TANK) W/TEMPERATURE RISE (40°-140°F)
COIL SIZES (DIA.-LENGTH)
4-18 4-36 6-24 6-36 6-54 8-42 8-60 10-42 10-48 12-36 12-48 14-42
180°F BOILER WATER 45 87 149 223 335 502 707 949 1079 1135 1544 1823
MINIMUM GPM REQ'D 4 7 13 19 28 42 59 79 90 95 129 152
212°F BOILER WATER 69 135 230 346 518 778 1094 1469 1670 1757 2390 2822
MINIMUM GPM REQ'D 6 12 20 29 43 65 91 122 140 146 200 235
NOTES:
1. Other coil sizes available.
2. Consullt factory for design parameters outside this chart.
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Page 2 of 4
www.hotwater.com
AOSCG40000
Packaged Hot Water Generating
®
Systems - Steam / Hot Water
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Page 3 of 4
www.hotwater.com
AOSCG40000
Packaged Hot Water Generating
®
Systems - Steam / Hot Water
SUGGESTED SPECIFICATION
The hot water heater generator package shall be A. O. Smith model no. HWG____________ (V) or (H), (ESW) or (EDW) with____________ heating coil.
The jacketed, insulated storage tank shall be constructed and stamped according to ASME specifications for (125) psi working pressure. The unit shall be
designed to recover____________ GPH for a temperature of_____degrees F to________ degrees F when supplied with____________ GPM boiler water
entering temperature regulator at ________degrees F. The heating coil shall be constructed and stamped according to section VIII of ASME code. The tube
bundles shall be constructed of 3/4" O.D. 20 GA. deoxidized drawn copper tubing. The unit shall be controlled by one of three means: On-Off
MoValve____________, Three Way Modulating Valve____________, Thermostatically Operated Boiler Water Pump____________. The unit will be
completely factory assembled and furnished with the following standard components.
A storage tank ______" dia. x ______" long with ______ gallon capacity. Tank shall be insulated with 3" fiberglass insulation, R-value > 12.5. Tank shall
be jacketed with heavy gauge steel with a baked enamel finish. Tank shall be built to ASME section lined and furnished with an ASME temperature &
pressure relief valve. Heating coil built to Section VIII of ASME code. A tempregulator to be self actuated, direct acting. A bronze integral circulator pump
with copper soldered recirculation line and (2 valves. A drain valve and assembly. Jacket mounted temperature and pressure gauges, ASME temperature &
pressure gauges, a CSA Certified and ASME Rated T&P relief valve and a full length channel base and lifting lugs.
OPTIONAL EQUIPMENT IS AS FOLLOWS:
STORAGE TANK
Tank shall have 150 psi or 160 psi operating pressure, an ASME section VIII construction, a 4"x6" handhole, 11"x15" manhole, a cement or epoxy lining.
WATER TO WATER SECTION
Section shall have a self actuated or pneumatic operated temperature regulator and a bypass loop in boiler water line for temperature regulator isolation.
SPECIFICATIONS - STEAM TO WATER
The hot water heater generator package shall be A. O. Smith model no. HWG _____________ (V) or (H), (ESW) or (EDW) with ____________ heating coil.
The jacketed, insulated storage tank shall be constructed and stamped according to ASME specifications for (125) psi working pressure. The unit shall be
designed to recover ____________ GPH for a temperature rise of ________ degrees F to ________ degrees F when supplied with ________ psi steam
to the temperature regulator. The heating coil shall be constructed and stamped according to section VIII of ASME code. The tube bundles shall be
constructed of 3/4" O.D. 20 GA. deoxidized drawn copper tubing. The unit will be completely factory assembled and furnished with the following standard
components.
A storage tank ______" dia. x ______"long with ______ gallon capacity. Tank shall be insulated with 3" fiberglass insulation, with an R-value > 12.5.
Tank shall be jacketed with heavy gauge steel with a baked enamel finish. Tank shall be built to ASME section IV, glasslined and furnished with an ASME
temperature & pressure relief valve. Heating coil built to Section VIII of ASME code. A temperature regulator to be self actuated, direct acting. Main F&T
trap, main "Y" strainer and associated black steel pipe. A bronze integral circulator pump with copper soldered recirculation line and (2) bronze ball valves.
A drain valve and assembly. Jacket mounted temperature and pressure gauge. A CSA Certified and ASME Rated T&P relief valve and a full length channel
base and lifting lugs. Air vent and vacuum breaker.
OPTIONAL EQUIPMENT IS AS FOLLOWS:
STORAGE TANK
Tank shall have 150 psi or 160 psi operating pressure, an ASME section VIII construction, a 4"x6" handhole, 11"x15" manhole, a cement or epoxy lining.
STEAM TO WATER SECTION
Section shall have a pilot (spring, air, temperature) operated temperature regulator .
For Technical Information and Automated Fax Service, call 800-527-1953. A.O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
Page 4 of 4
www.hotwater.com
AOSCG40000
Loading...