FEATURES HWI Models A. O. Smith s HWI models are available for operation with steam or boiler water as the energy source. They are factory assembled with components sized, piped and checked at the factory before shipment. HWI models are all space saving vertical models. INSULATION AND JACKETING - The HWI systems will be insulated with fiberglass to an R value of 1.5 and enclosed in a baked enamel jacket. CODE LISTING - The system will employ an ASME U code shell. fitted with an ASME U code 3/ diameter copper tube heat exchanger. INTEGRAL PUMP - The HWI system will employ an integral bronze circulator pump. STEAM UNITS - 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. BOILER UNITS - Boiler water trim includes temperature control valve and boiler water temperature gauge. CONTROL FEATURES SINGLE POINT WIRING Single 10V connection, controls including integral circulation ON/OFF SWITCH Allows local on/off for service TEMPERATURE READOUT LED readout of water temperature PID TEMPERATURE CONTROL Modulates electrical control valve HIGH TEMPERATURE LIMIT Closes main valve under over temperature condition REMOTE TEMPERATURE SIGNAL -WIRE RS85 COMMUNICATION (MODBUS or ASCII) 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 YEAR LIMITED WARRANTY. U NOTE: THIS OUTLINE IS NOT A WARRANTY. For complete information, consult the written warranty or A. O. Smith. Revised November 01 Page 1 of 8
TO SPECIFY HWI SERIES PACKAGE WATER HEATER: 1. Determine 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.. From the recovery table, obtain the required GPH capacity and temperature rise. Selecting heating coil size. 3. Decide whether single or double wall coil is required. SELECT YOUR MODEL STYLE COIL MODEL TYPE HWI S 088 15 E D CHOSEN FROM TABLES TO DETERMINE CODE SIZE DOUBLE WALL = D SINGLE WALL = S STEAM = S WATER = W STEAM PRESSURE WATER TEMPERATURE CAPACITY CHARTS: Boiler Water 180 F - 160 F 10 F 1 HWI-W 088 HWI-W 108 HWI-W 18 HWI-W 18 HWI-W 168 HWI-W 188 HWI-W 088 HWI-W 108 HWI-W 18 HWI-W 18 HWI-W 168 HWI-W 188 DOM water flow GPM 11 19 6 7 59 7 1 17 30 39 Boiler Water flow GPM 5 77 106 13 19 1 61 86 11 15 198 BTU/HR 38,000 756,000 1,0,000 1,393,000 1,870,000,37,000 37,000 596,000 8,000 1,09,000 1,89,000 1,936,000 Passes Boiler Water 190 F - 170 F 10 F 1 HWI-W 088 HWI-W 108 HWI-W 18 HWI-W 18 HWI-W 168 HWI-W 188 HWI-W 088 HWI-W 108 HWI-W 18 HWI-W 18 HWI-W 168 HWI-W 188 DOM water flow GPM 13 31 1 55 68 8 1 19 6 Boiler Water flow GPM 53 90 17 167 5 78 1 71 97 133 178 BTU/HR 517,000 875,000 1,3,000 1,631,000,189,000,706,000 397,000 695,000 93,000 1,91,000 1,738,000,185,000 Passes For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page of 8
CAPACITY CHARTS (Continued): Steam 5/* 10 F HWI-S 068 05 HWI-S 088 05 HWI-S 108 05 HWI-S 18 05 HWI-S 18 05 HWI-S 168 05 11 0 33 7 61 8 617 778 185 188 369 3185 1 HWI-S 068 05 HWI-S 088 05 HWI-S 108 05 HWI-S 18 05 HWI-S 18 05 HWI-S 168 05 7 1 3 3 3 58 363 686 1130 168 096 81 Steam 10/5* 10 F HWI-S 068 10 HWI-S 088 10 HWI-S 108 10 HWI-S 18 10 HWI-S 18 10 HWI-S 168 10 11 1 51 66 87 59 86 1373 030 69 37 1 HWI-S 068 10 HWI-S 088 10 HWI-S 108 10 HWI-S 18 10 HWI-S 18 10 HWI-S 168 10 8 15 5 36 8 63 10 755 150 1807 380 3119 Steam 15/10* 10 F HWI-S 068 15 HWI-S 088 15 HWI-S 108 15 HWI-S 18 15 HWI-S 18 15 HWI-S 168 15 1 3 38 56 73 96 51 96 156 68 968 3889 1 HWI-S 068 15 HWI-S 088 15 HWI-S 108 15 HWI-S 18 15 HWI-S 18 15 HWI-S 168 15 9 17 8 0 53 69 67 861 10 05 691 10 For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page 3 of 8
CAPACITY CHARTS (Continued): Steam 0/15* 10 F HWI-S 068 0 HWI-S 088 0 HWI-S 108 0 HWI-S 18 0 HWI-S 18 0 HWI-S 168 0 13 5 1 60 76 103 558 1031 1699 55 3130 10 1 HWI-S 068 0 HWI-S 088 0 HWI-S 108 0 HWI-S 18 0 HWI-S 18 0 HWI-S 168 0 10 18 30 57 75 515 93 156 6 8 380 Steam 30/0* 10 F HWI-S 068 30 HWI-S 088 30 HWI-S 108 30 HWI-S 18 30 HWI-S 18 30 HWI-S 168 30 1 6 63 83 109 600 1097 18 619 33 98 1 HWI-S 068 30 HWI-S 088 30 HWI-S 108 30 HWI-S 18 30 HWI-S 18 30 HWI-S 168 30 10 19 3 6 61 80 5 1000 166 399 3157 13 Steam 50/30* 10 F HWI-S 068 50 HWI-S 088 50 HWI-S 108 50 HWI-S 18 50 HWI-S 18 50 HWI-S 168 50 16 9 8 69 91 119 676 17 0 913 3818 5000 1 HWI-S 068 50 HWI-S 088 50 HWI-S 108 50 HWI-S 18 50 HWI-S 18 50 HWI-S 168 50 11 1 51 67 88 609 11 1863 696 31 65 For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page of 8
CAPACITY CHARTS (Continued): Steam 0/15* 10 F HWI-S 068 75 HWI-S 088 75 HWI-S 108 75 HWI-S 18 75 HWI-S 18 75 HWI-S 168 75 18 33 5 78 100 1 783 15 33 337 318 5793 1 HWI-S 068 75 HWI-S 088 75 HWI-S 108 75 HWI-S 18 75 HWI-S 18 75 HWI-S 168 75 13 0 59 7 100 73 1319 18 316 11 501 For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page 5 of 8
MODEL A B C D HWI1068 110 36 38 HWI1088 110 36 6 38 HWI108 110 36 8 38 HWI18 110 36 30 38 HWI18 110 36 3 38 HWI168 110 36 3 38 HWI188 110 36 36 38 A D B C FIELD WIRE 10VAC PILOT SWITCH AUTO HIGH LIMIT HONEYWELL L6008A EQUIP GND PUMP SWITCH CIRC. PUMP BLK PRIMARY FUSES 1.5 A BLK VALVE ACTUATOR SIEMENS SKD6U X-FMR SEC V SEC. FUSE BLK BLK 10VAC VAC RED BLU WEST CONTROLLER RED RED TEMP PROBE CONTROL BOX For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page 6 of 8
SPECIFICATIONS - 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 designed to recover gpm for a temperature rise of degrees F to degrees F when supplied with psig steam to the control valve. The heating coil shall be constructed in accordance with ASME section VIII code. Single wall heat exchangers shall have 3/ O.D., 0GA 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 transfer. Each coil shall have stainless steel baffles and shell side tube sheet. The heater shall be factory assembled and piped including y-strainer, electric actuated control valve, main and auxiliary steam traps, condensate strainer, bronze integral circulator piped and wired to circulate water across the coil, vacuum breaker, air vent, ASME temperature and pressure relief valve and incoming steam pressure gauge. SPECIFICATIONS- WATER TO WATER The instantaneous hot water generator package shall be A.O. Smith model HWI, (EDW)-() or (), (ESW)-() or () with - pass 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 I5Opsi. The heater shall be designed to recover gpm for a temperature rise of degrees F to degrees F when supplied with gpm of, degrees F boiler water to the control valve. The heating coil shall be constructed in accordance with ASME section VIII code. Single wall heat exchangers shall have 3/ O.D., 0GA 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 transfer. Each coil shall have stainless steel baffles and shell side tube sheet. The heater shall be factory assembled and piped including electric actuated 3-way or -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 state temperature controller with dual LED display. The controller shall have remote temperature selection, a green temperature setting display screen and high limit display screen, The controller shall be supplied with output contact to interface with building automation system for power on and high temperature limit status. The controller shall allow the building automation system to turn the unit on or off through a VAC relay. The controller shall have user-selectable communications interface of -wire RS85 (MODBUS or ASCII) or off-line PC configuration. For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page 7 of 8
For Technical Information and Automated Fax Service, call 800-57-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice. Revised November 01 Page 8 of 8