Technical Documents

ManualsBrandsA.O. Smith ManualsHot Water GeneratorsA.O. Smith Hot Water Generator

Packaged Hot Water Generating

Systems - Steam / Hot Water

STEAM / HOT WATER

MODELS HWG

HWG MODELS

Page 1 of 4

AOSCG40000

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.

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:

If the tank should leak any time during the

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.

THE COIL HAS A ONE YEAR LIMITED WARRANTY.

NOTE: THIS OUTLINE IS NOT A WARRANTY.

For complete information,

consult the written warranty or A. O. Smith Water Products Company.

August 2014R

268141_AOSCG40000.indd 1268141_AOSCG40000.indd 1 8/1/14 1:24 PM8/1/14 1:24 PM

Summary of content (4 pages)

PAGE 1
® Packaged Hot Water Generating Systems - Steam / Hot Water STEAM / HOT WATER MODELS HWG HWG MODELS 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.
PAGE 2
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.
PAGE 3
® 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 224273 AOSCG40000 3 268141_AOSCG40000.
PAGE 4
® 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.