Page 1
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
Page 2
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
Page 3
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
Page 4
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 20
HWI-S 0848 20
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
HWI-S 0648 20
HWI-S 0848 20
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
HWI-S 0648 30
HWI-S 0848 30
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
HWI-S 0648 30
HWI-S 0848 30
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
20
20
20
20
20
20
20
20
30
30
30
30
30
30
30
30
Steam 20/15*
DOM water flow GPM Ibs /HR
13
25
41
60
76
103
10
18
30
44
57
75
Steam 30/20*
DOM water flow GPM Ibs /HR
14
26
44
63
83
109
10
19
32
46
61
80
558
1031
1699
2455
3130
4210
515
934
1546
2246
2844
3840
600
1097
1824
2619
3434
4498
544
1000
1664
2399
3157
4132
Temp Range Heater Model
HWI-S 0648 50
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 50
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
HWI-S 0648 50
HWI-S 0848 50
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
50
50
50
50
50
50
50
50
Steam 50/30*
DOM water flow GPM Ibs /HR
16
29
48
69
91
119
11
21
35
51
67
88
676
1227
2024
2913
3818
5000
609
1124
1863
2696
3531
4625
www.hotwater.com
Page 4 of 8
AOSCG40100
Page 5
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.
*
HWI-S 0648 75
HWI-S 0848 75
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
HWI-S 0648 75
HWI-S 0848 75
HWI-S 1048
HWI-S 1248
HWI-S 1448
HWI-S 1648
75
75
75
75
75
75
75
75
Steam 20/15*
DOM water flow GPM Ibs /HR
18
33
54
78
100
135
13
24
40
59
74
100
783
1425
2343
3372
4318
5793
723
1319
2182
3162
4121
5401
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
www.hotwater.com
Page 5 of 8
AOSCG40100
Page 6
Commercial Semi-Instantaneous Water Heaters
MODEL
HWI10648
HWI10848
HWI41048
HWI1248
HWI1448
HWI1648
HWI1848
A B C D
110 36 24 38
110 36 26 38
110 36 28 38
110 36 30 38
110 36 32 38
110 36 34 38
110 36 36 38
A
D
PRIMARY
FUSES
1.5 A
AUTO HIGH LIMIT
HONEYWELL L6008A
120VAC
BLK
WHT
B
BLK
WHT
CONTROL BOX
X-FMR
24V SEC.
FUSE
24VAC
SEC
BLK
WHT
PILOT SWITCH
BLK
WHT
WEST
TEMP PROBE
PUMP SWITCH
CIRC. PUMP
EQUIP
GND
RED
RED
WHT
FIELD WIRE 120VAC
CONTROLLER
C
VALVE AC TUATOR
SIEMENS
SKD62U
RED
BLU
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
www.hotwater.com
Page 6 of 8
AOSCG40100
Page 7
Commercial Semi-Instantaneous Water Heaters
SPECIFIC ATIONS - STEAM TO WATER
The instantaneous hot water generator package shall be A .O. Smith model HWI , (EDS) or (ESS) with _ ______1 heating coil. The jacketed
and insulated heater shall have a 316L stainless steel vessel constructed in accordance with ASME section VIII for a working pressure of
150psi. The heater shall be de signed to recover _ _ _ _ _gpm for a temperature rise of _ _ _ _ degrees F to _ _ _ _ _ degrees F when supplied with
____ psig s team to the control valve. T he heating coil shall be constructed in accordan ce with ASME section VIII code. Single wall heat
exchanger s shall have 3 /4” O.D., 20GA deoxidize d drawn copper tube s. Double wall heat exchangers shall have 5 /8” I.D. deoxidized drawn
copper tube within a tube. The external tube shall have radial fins for enhanced h eat transfer. Each coil shall have s tainless steel baffles
and shell side tube she et.
The heater shall be fac tory assembled and piped including y -s trainer, electric actuate d control valve, main and auxiliar y s team
traps, condensate strainer, bronze integral circulator piped and wired to circulate water across the coil, vacuum breaker, air vent, ASME
temperature and pre ssure relief valve and incoming steam pressure gauge.
SPECIFIC ATIONS - WATER TO WATER
The instantaneous hot water generator package shall be A .O. Smith model HWI , (EDW )- (2) or (4), (ES W)-(2) or (4) with ______ _ _- _ _ _ __
pas s heating coil. The jacketed and insulated heater shall have a 316L stainless steel vessel constructed in accordan ce with ASME section
VIII for a working pressure of I5Opsi.
The heater shall be designed to recover _____gpm for a temperature rise of — — — — degrees F to _ _ _ _ _ d egrees F whe n supplied with
____ gpm of — — —, degrees F boiler water to the control valve. The heating coil shall be construc ted in accordance with ASME section VIII
code. Single wall heat exchangers shall have 3/4” O.D., 20GA deoxidized drawn copper tubes. Double wall heat exchangers shall have 5/8”
I.D. deoxidized drawn copper tube within a tube. The external tube shall have radial fins for enhanced heat transfe r. Each coil shall have
stainless steel baffles and shell side tube sheet. The heater shall be factor y assembled and piped inclu ding elec tric actuated __ _ _ _ 3-way
or __ _ _ 2-way control valve, bronze integral circulator piped and wired to circulate water across the coil, ASME temperature and pressure
relief valve and incoming boiler water temperature gauge.
TEMPERATURE CONTROL
The heater shall be supplied with a (PID) solid st ate temperature controller with dual LED display. The controller shall have remote
temperature selection, a green temperature set ting display screen and high limit display screen, The controller shall be supplied with
output contact to interface with building automation s ys tem for power on and high temp erature limit statu s. The controller shall allow
the building automation sy stem to turn the unit on or off through a 24VAC relay. The controller shall have u ser-selectable communications
interface of 2-wire RS485 (MODBUS or ASCII) or of f-line PC configuration.
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
www.hotwater.com
Page 7 of 8
AOSCG40100
Page 8
Commercial Semi-Instantaneous Water Heaters
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
www.hotwater.com
Page 8 of 8
AOSCG40100
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