A. O. Smith HWI-S 0648 10 User Manual

Commercial Semi-Instantaneous Water Heaters

FEATURES

A. O. S mith’s HWI mo dels are available for operation with steam or boiler water
as the ene rgy source. T hey are factory assembled with co mponents sized, piped
and checked at the fa ctory before shipment. HWI models are all space saving
ver tical models.

INSUL ATION AND JACKETING - T he HWI systems will be insulated with

fiberglas s to an R value of 12.5 and enclosed in a baked enamel ja cket.

CODE LISTING

ASME “U” code 3/4” diameter copper tube heat exchang er.

INTEGRAL PUMP

pump.

STEAM UNITS

auxiliary steam traps, inlet and auxiliar y strainers, steam pressure gauge with
siphon , vacuum breaker and air vent.

BOILER UNITS

water temperature gauge.

CONTROL FEATURES

n

SINGLE POINT WIRING

Single 120V connection, controls including integral circulation

n

ON/OFF SWITCH

Allows local on/off for service

n

TEMPERATURE READOUT

LED readout of water temperature

n

PID TEMPERATURE CONTROL

Modulates electrical control valve

n

HIGH TEMPERATURE LIMIT

Closes main valve under over temperature condition

n

REMOTE TEMPERATURE SIGNAL

n

2-WIRE RS485 COMMUNICATION (MODBUS or ASCII)

- The system will employ an A SME”U” code shell. fitted with an

- The HWI system will employ an integral bronze circulator

- Steam trim consists of temperature control valve, inlet and

- Boiler water trim includes temperature control valve and boiler

HWI Models

LIMITED WARRANTY OUTLINES

If the shell should leak any time during the first five years, under the terms of the
warranty A. O. Smith will repair or replace the shell. Installation, labor, handling and
local delivery extra.

THE COIL HAS A ONE YEA R LIMITED WARRANTY.

NOTE: THIS OU TLINE IS NOT A WA RR ANTY. For complete information, consult the
written warrant y or A. O. Smith.

U

Revised November 2012

Page 1 of 8

AOSCG40100

Commercial Semi-Instantaneous Water Heaters

TO SPECIFY HWI SERIES PACKAGE WATER HEATER:

1. Determine what t ype of heating medium will be used; steam or b oiler water.

• If STEAM - Determine pressure in coil.

• If BOILER WATER - Determine available boiler water temperature.

2. From the recovery table, obtain the required GPH capa cit y and temperature rise.
Selecting heating coil size.

3. Decide whether single or double wall coil is required.

SE LE CT YOUR M OD EL

ST YL E CO IL M OD EL TY PE

CAPACITY CHARTS:

Temp Range Heater Model

40°F

To

120°F

40°F

To

140°F

HWI-W 0848
HWI-W 1048
HWI-W 1248
HWI-W 1448
HWI-W 1648
HWI-W 1848

HWI-W 0848
HWI-W 1048
HWI-W 1248
HWI-W 1448
HWI-W 1648
HWI-W 1848

HWI

CHOS EN F ROM TABLE S TO
DETE RMIN E CODE SI ZE

ST EA M = S WATE R = W

0 8 4 8S E15 D

Boiler Water 180°F - 160°F

DOM water

flow GPM

11
19
26
35
47
59

7
12
17
22
30
39

DOUB LE
WALL = D
SING LE
WALL = S

ST EA M PRE SS UR E

WATER TEMPERATURE

Boiler Water

flow GPM

45

77
106
143
192
241

35

61

86
112
152
198

BTU/HR Passes

438,000

756,000
1,035,000
1,393,000
1,870,000
2,347,000

347,000

596,000

844,000
1,092,000
1,489,000
1,936,000

2
2
2
2
2
2

4
4
4
4
4
4

Boiler Water 190°F - 170°F

Temp Range Heater Model

HWI-W 0848

40°F

To

120°F

40°F

To

140°F

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.

Revised November 2012

HWI-W 1048
HWI-W 1248
HWI-W 1448
HWI-W 1648
HWI-W 1848

HWI-W 0848
HWI-W 1048
HWI-W 1248
HWI-W 1448
HWI-W 1648
HWI-W 1848

DOM water

flow GPM

13
22
31
41
55
68

8
14
19
26
35
44

Boiler Water

flow GPM

53

90
127
167
225
278

41

71

97
133
178
224

BTU/HR Passes

517,000

875,000
1,234,000
1,631,000
2,189,000
2,706,000

397,000

695,000

943,000
1,291,000
1,738,000
2,185,000

www.hotwater.com

2
2
2
2
2
2

2
2
2
2
2
2

Page 2 of 8

AOSCG40100

CAPACITY CHARTS (Continued):

Commercial Semi-Instantaneous Water Heaters

Temp Range Heater Model

40°F

To

120°F

40°F

To

140°F

Steam pressure in lines/steam pressure in tubes.

*

Temp Range Heater Model

40°F

To

120°F

40°F

To

140°F

Steam pressure in lines/steam pressure in tubes.

*

HWI-S 0648 05
HWI-S 0848 05
HWI-S 1048 05
HWI-S 1248 05
HWI-S 1448 05
HWI-S 1648 05

HWI-S 0648 05
HWI-S 0848 05
HWI-S 1048 05
HWI-S 1248 05
HWI-S 1448 05
HWI-S 1648 05

HWI-S 0648 10
HWI-S 0848 10
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648

HWI-S 0648 10
HWI-S 0848 10
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648

10
10
10
10

10
10
10
10

Steam 5/2*

DOM water flow GPM Ibs /HR

11
20
33
47
61
82

7
14
23
34
43
58

Steam 10/5*

DOM water flow GPM Ibs /HR

11
21
35
51
66
87

8
15
25
36
48
63

617

778
1285
1848
2369
3185

363

686
1130
1648
2096
2821

459

846
1373
2030
2649
3472

410

755
1250
1807
2380
3119

Temp Range Heater Model

HWI-S 0648 15

40°F

To

120°F

40°F

To

140°F

Steam pressure in lines/steam pressure in tubes.

*

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.

Revised November 2012

HWI-S 0848 15
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648

HWI-S 0648 15
HWI-S 0848 15
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648

15
15
15
15

15
15
15
15

Steam 15/10*

DOM water flow GPM Ibs /HR

12
23
38
56
73
96

9
17
28
40
53
69

512

946
1546
2268
2968
3889

467

861
1420
2045
2691
3510

www.hotwater.com

Page 3 of 8

AOSCG40100