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Laarsen Associates IW User's Manual

1. 9 j ULd JESY JOMO7 YO lU uupiI AA PIOUS 16 1 0464 04 1 40 1UBIY lu uupi AA 46 16 1 10462 Puy 1 40 043 qw ssy lppes Je y 190606 46 H Je y 190606 46 H Je y 190606 46 H L 14014 1960606 46 YEOH SILL 14014 160606 46 16 1 SILL 14014 1960606 46 JOH JY 3 U4 OdS plalys 16 1 GY LV OV 6 86 LE 96 G ve CE 06 60 80 20 90 Ge vc lt GG 12 ON uondusseqg 9 yw Mighty Therm Volume Water Heater Page 25 OOWRNOO 4 1 3 OOWRNOO 4 Assembly 20031905 12005700 T2023600 12006100 T2000100 12023600 T2023600 T2005800 13 75 17 63 T 0 0 2 4 3 0 0 OOWRNOO 4 Assembly 20031904 OOWRNOO OOWRNOO H 1 o 1 8 1 3 1 9 1 o 1200 Assembly 20031906 1010 OOWRNOO 19 19 17 63 unit are the same for rear tiles 1430 Assembly 20031907 OOWBRNOO 4 1 3 1 9 1 9 1 9 8 Ce eo FU 1670 OOWARNOO 4 OOWBRNOO Assembly 20031908 S T2000100 T2023600 T2023600 T2023600 T2006200 19 19 19 19 14 75 n i 1825 Assembly 20031909 T2000100 T2023600 T2023600 T2023600 T2006300 O OG T NOUOoOd 4 OOWRNOO 4 Figu
2. CLOSET INSTALLATION UNACCEPTABLE A closet is any 4 sided enclosure which is less than 16 times the total volume of all the gas fired appliances within the enclosure z Heater Figure 5 Installation on Concrete Blocks or Tile Water Heater ROOM INSTALLATION ACCEPTABLE A room is any enclosure which is at least 16 times greater than the total volume of all the gas fired appliances within the enclosure ALCOVE INSTALLATION ACCEPTABLE An alcove suitable for the installation of awater heater is arestricted section of a room not separated from the room by adoor or partition and which meets the minimum clearances for the specific model water heater listed below When the ceiling height exceeds 8 feet you are only allowed to consider 8 feet when calculating the total volume of the enclosure Figure 6 Alcove Installation Page 6 LAARS HEATING SYSTEMS 2B 1 Combustion Air Supply 1 The heater location must provide sufficient air supply for proper combustion and ventilation of the surrounding area as outlined in the latest edition of ANSI standard Z223 1 and any local codes that may be applicable Inadequate combustion air supply may result in incomplete combustion sooting of the heat exchanger and unsafe operation of the heater 2 In general these requirements specify that small heater rooms should be provided with two permanent air supply openings communicating directly through the wall
3. Z00d 0002c00d 00 lapow Old POY Yo SALA SED 08 0 16160 JEN POW Yoo SALA SCD B u Bunei do Old 8 YEN pow Yoo AUO Hd HH Saea sed deusnpoy Old abeis SALA SCD B u Bunei do Old 90815 t SANLA 580 Ajayes Old abels p SA J8EA SCL UOIJCUIQWOD JEN 9646 SALA SED 6 4 1800 JEN a6eIs p Sen sed Ajajyes JEN 96 15 p SA J8A SEL UOIJECUIQWOD Old 46 1066 POW YOO Id 19 Aes souung Old PIO UeN dS poy YOON Id 19 Aes aung JEN 146 1066 t 9 PON u S lA q ALL aung JEN PIOpUeN 1106 PON Yoo AI AeL souung Old 46 HAS 666 IS Aes aung JEN 46 HAS abeis y q Aes 19419 Old 146 1066 TDS Z 1lojid 45 19419 JEN 010 1066 19S 00616 z all AeL sauing 1J snjiiq 168 2 6448 4 z L uoisu lx3 diq PH bS p e Bnd 80 20 90 90 YOL 60 00 LOL 001 66 86 26 96 96 v6 66 06 16 06 68 ON uondiu5s q 9 yw LAARS HEATING SYSTEMS Page 30 SECTION 7 Outdoor Parts Descriptions and Order Numbers 60819901 60219901 00709901 60 6S901 6096990 6068990 60169904 2 60809901 6026990 2 00929904 0020 002 60S8S901 6066990 2 00229904
4. n q 189uS deems 19463 1401 DDII A 96 8 reap ayyeg 168 X 1013 9409 SILL 1010 00 8014 woddns 1407 02 69 8y ov LV Ol 8 Z ON uondusseg Aey SECTION 8 Optional Parts Descriptions and Order Numbers Pump Rotating Sections and Repair Parts Check pump assembly on heater for H P rating and find correct Laars part number from table below Description Pump Rotating Assembly B amp G 1522 w 3 IMP Bronze 1P Pump Rotating Assembly B amp G Series 90 w 3 Impeller 1P Pump Rotating Assembly TACO 1630 w 3 Impeller 1P Pump Rotating Assembly TACO 1630 w 4 Impeller 1P Pump Rotating Assembly B amp G 1522 w 4 Impeller Bronze 1P Pump Rotating Assembly B amp G Series 90 w 4 Impeller 1P Pump Rotating Assembly TACO 1630 w 5 Impeller 1P Pump Rotating Assembly B amp G 1522 w 5 Impeller Bronze 1P Pump Rotating Assembly B amp G Series 90 w 5 Impeller 1P Motor Pump B amp G 1522 P Coupler Pump B amp G Universal Bearing Assembly Pump B amp G 1522 Universal Bearing Assembly Pump B amp G 1522 Bronze Gasket Pump B amp G 1522 PW1 2151 Mounting Ring B amp G 1522 Motors Impeller B amp G 1522 3 Impeller B amp G 1522 4 Impeller B amp G 1522 5 Automatic Reset Temp Limit Switch Manual Reset High Gas Pressure Switch Manual Reset Low Gas Pressure Switch Alarm Bell 110 Volts Outdoor Reset Single Stage 30 Bulb O
5. 2 0096690 0 8 90 008790 00 I DOIN siwu u o 0 5 yueno z s 4068 101 p uinb i Ai uenb 1lu s id 1 Ul siSquinN ALON 068cS0l vOVVSSOl vO9VSSOl vOOLVSOL vO6OVSOl 2 0001SSOL VOSLESO vOSOVSOl OO0VESOl OO9LESOL vOvVOVSOl vO6cESOl cOLOVSOl LOZOVSOl 2 0096690 90 8790 cOO8VS0l 098 I DOIN cO6EESO lL cOvvSsol cO9VSSOl SOOLVSOL 060790 2 000960 0 90 090t90 L 000 90 OO9LESOL cOvOVvsSol 06c 90 4 cOLOVSOl LOZOVSOlL 2 0096690 0008 90 cO6ZVSOl GLZ I PON cO6EESOl cOvVVSsol cO9VSSO0l cOOLVSOL cO60VS0l 2 000 SSOL cOGLESOL cOSOVSOl OOOVESO OO9LESOL cOvOVSOl c06cEeSO0l cOLZOVSOl LOZOVSOlL 2 0096690 028 90 LO6Z7SOl 009 I DOIN LO6EESOl LOvVSSOl LO9VSSOl LOOLVSO LOGOYSO L 2 000 SSOL LOSLESOL LOSOYSO L OOOVESO OO9LESOL LOvOvVSOl LOGZESO L cOLOVSOl LOZOVSOlL 2 0096660 z 00109901 009 10001 1012 0 lt n j Jaaus deems 19463 1407 DDIN JUSWP AM 46 16 10460 14 1 40 187 pooyyeiq 14 aleg 04 pooyyeiq uoddns sjeyoeg Jedd jeued luoij JUSLWUPJ9M PIOUS e H l ueq Jeay 1 ddN 437 1 ddn 9464 pug 1YBly 1 ddn jeued pug JUSUWUPJ9M PIOUS JEOH SUEd 169 U uup AA Jey
6. 800 0022 90 0089 90 001980035 00600104 009 I PON OO8VO00A OOcVOO0A 002 90 LOZS S01 020 90 LOEScSOl LO6cSS01 zz 00628007 zz 00209007 L06ScS0l OOEVEOOM OOSVEOOM OOVVEOOM 00917800 OO8SE00M OOZVEOOM c0S6cS0l 096290 00 amp S00 LO69ESOl 2 00 LZ 004 0022 90 0089 90 00198005 00600103 00 10001 8001 Sed enue AJEA 21 Sey enue SALA 14011 JayOeug UMOG JUNG UJ JoyOeIG UMOG Al 18411 04011 pig uoneloti nuy u uing 0 bug uonejoy aung Assy Je d 19409 pjojiuey O M 6 8uedoid UO SED JEN BUO Buis 1lu uupi AA 0 0 SBS YEN 0l d dil 80 4 6 4 1 JOUING 1 YEN 10 dil uosuuor JOUING 1 auedold 40 Buipuels 80 4 6 4 1 JOUING 1 01 40 Buipue1s UOSUYOP JOUING 1 JEN 1 04 Buipuels 80 4 6 4 1 JOUING 1 JEN 1 04 Buipuels UOSUYOP JOUING 1 Qold 87 84 1 0 0 406440 l UIDI AA 19u inq uq Old ule aung Assy uoddns seg 28 8 INN Buln JOAOD Xog O1JUOD Uu uup AA xog JO1JU0D AVZ2 AG LL 4ewsojsued 64 01140 lt uollluB 69 09 19 09 69 89 LG 9G 99 rS S 059 19 OS 67 987 27 9y Gy vY p ON uondusseg 9 yw Page 27 Mighty Therm
7. IaM yeysenby IaM 1916 ameg 1 1 18 19166 JapesH 1811168 10166 10062 10166 004 zuo1g tr900S 2 z 90 GE900S Z L z 90 9 900S z ebue 4 92 01 079006 19pe H 1 linOA lui 7600 S 19pe H 1 linoA slul 92 01 2 79006 19606 41016 L8600 S 18606 410168 02 6 8 Zl gI Gl Vi l GL 1 Bueuox3g 1e H LEOL Edy 3 H4 40 gt 16 169 168 14014 9409 SILL 1010 09 8114 1100010 140 1O 29 oO9 1x4 166 0109 09 9014 jeued 166 0401 10499109 80014 19460 puq 491 1o 99 loO jeued 1O 99 o9 162606 Ajquiassy dol CGN CQ O CO N O ON uondusseg Aey Mighty Therm Volume Water Heater Page 23 Model PH only 1 Stiffeners on 850 1825 only 2 850 1825 only NOTE Temperature Control Wells Inlet Outlet Header 1 Firing Mode L K amp C 2 Dry Wells 2 Firing Mode H eg 80 A Natural Gas Boilers amp Heaters a le ie 500 thru 850 2 Dry Wells 1010 thru 1430 3 Dry Wells AP ea A 1 83 1670 thru 1825 4 Dry Wells 81 82 B Propane Gas Boilers amp Heaters f Be NG 500 thru 850 2 Dry Wells CSR 1010 thru 1852 3 Dry Wells 850 1825 sizes only 7 g
8. PH X8H MAIS 1j depv dung BulsnoH dung ayse Bulsnoy dwnd Ajqwessy 6 10 dwnd NED L X Z L ZX Z L z pay Ae L XZ Xg 99 pay X z L Z IddIN AJB 19 X Z 0 1000100 JOOPU 4 146 MOJ 30066 ss ld dw L 190 92 W E JOEY SS 1d SALA ww X 7 0 sseig 0 LdN u2 t Bid LdN L pH bs 6n d J USEAA uo b bX Eb 0 063 Masog P L OX EL 0 1 DED Masog VX EL 0 ED Masog j yOIU OIdNY Ajquiessy qn Jaddoy Ajquessy qn enuen Se Olid SNELA Old a6eIS OML HO U0 Bulyesedgo 560 ane JEN 6 15 OML HO uO Bay 6 21800 sed ALAN Old a6eIS OML HO UO SALA SED 66 JEN aBeIS OM HO uO ONLA Sed 66 88 29 99 98 v8 69 08 18 08 62 82 L OZ 92 VL EL GL LZ 02 69 89 29 99 99 79 ON uondusseg w LAARS HEATING SYSTEMS Page 28 00617500 OO8ZVO0A S d 9 7 N OOLLZOOA 2 006 600 OOZ9VO0A 2 OOELSOOA 00891700 SOSOSSOl gO0c L990 4 6090 0 6020990 6096290 4 6090990 L OOV8EEOl 00 Z00d 0002000 9081 I DOIN 006179500 OO8ZVO0A 6 5 F N OOLLZ OOA 2 0064600 0029700 2 OOELSOOA OO89V00A vOSOSSOl YOC SSO L 8090 0 4 8020990 8096290 L 8090990 L OOV8EEOl 00 Z00d 0002 c00d 0291 I PON 00067900A OO
9. 6090990 00109901 2 0020990 6028990 60149904 6018990 60209901 008 10001 80819901 80219901 00709901 80 6990 8096990 8068990 80169904 2 80809901 8026990 2 00929904 0020 002 8098990 8066990 2 00229904 8090990 00109901 2 00z09901 80285901 80125901 80185901 80209901 029 lapow Z0819901 202Z L990 00709901 Z0E6S901 Z0S6S901 Z068S901 Z01L6S901 2 2108099014 4026990 Z 00929904 0020 002 Z0S8S901 Z066S901 2 00229904 4090990 L 00109901 2 00z09901 Z0Z8S901 Z02990 Z018S901 ZO0Z09901 Oeti I PON 90819901 90219901 00709901 90 6S901 90S6S901 9068990 9016990 2 90809901 90265901 2 00929904 0020 002 9098990 9066990 2 0OZZS901 9090990 00109901 2 00z09901 90285901 90LZS901 9018990 90209901 ooz L I POIN SO819901 902 990 00 0990 SOE6S901 SOS6S901 S068S901 90416990 2 GO809901 9026990 2 00SZS901 00c0S00 9098990 9066990 2 0OZZS901 S0S09901 00109901 2 00z09901 9028990 SOLZS901 90 8990 S0Z09901 OLOL lapow siwu u o 0 SI AlllupnoO 216 4068 JO 00110 001 AyuUeNb 1lu s id 1 u SIBQUINN 3 LON vO8l9901 702 990 0070990 70 6990 7096990 7068990 vOL6S9OL 7080990 vOZ6S901 2 0097990 00209002 7098990 7066990 2 00ZZS901 7090990 00109901
10. A loop circulator is required to maintain forced circulation in the building hot water piping system Figure 15 Single Installation Piping Diagram Model IW Page 14 180 Water To Bldg SS Conventional Tank 180 Water To Bldg 140 Water Return From Bldg 180 Water Return From Bldg Gr lt Pump PW Series VW Series Zz 2 ra gt or 2 To Drain LAARS HEATING SYSTEMS With Horizontal Tank Legend B Check Valve in Hot Water Supply to Tempering Valve C Check Valve in Return Line from Building Loop D Tempering Valve E Venturi Suction Tee H Throttling Valves in Building Loop Returns l Circulating Pump for 180 Building Loop J Circulating Pump for 140 Building Loop K Service Valves to Isolate Heater and Pump for Service 140 Water Return From Bldg Conventional Tank s 180 Water um eturn PW Senes From Bldg VW Series RON To Drain Figure 16 Two Temperature Hot Water Supply System Model VW or PW With Vertical Tank B Check Valve in Hot Water Supply to Tempering Valve C Check Valve in Return Line from Building Loop D Tempering Valve E Venturi Suction Tee H Throttling Valves in Building Loop Returns I Circulating Pump for 180 Building Loop J Circulating Pump for 140 Building Loop K Service Valves to Isolate Heater and Pump for Service Mighty Th
11. General Information 3D ToTurn Off Heater eee Reece ee eee ee a 19 1A PMT GIEIG WON 3 SE To Shut DOWN System 19 1B Heater Identification 3 1C Flow Requirements 4 SECTION 4 1D Water Chemistry 4 Maintenance dolore S S s 19 SECTION 2 Installation SECTION 5 2A Heater Placement 4 Troubleshooting and Analysis of 2B Installation of Indoor Heaters 4 Service Problems 2B 1 Combustion Air Supply au 2 lt lt lt lt lt 20 2B 2 VeNUNG 2 au s s 6 2C Installation of Outdoor Heaters 7 SECTION 6 2D Gas Supply and Piping 7 D D ibti d Order Numb 2E Electrical Wiring 8 arts Descriptions an reer Numbers OF Water Piping of System 55 ee BB eee eee erences 22 2G Water Expansion 9 2H Pump Performance and Installation 10 SECTION 7 21 Water Pressure 16 Outdoor Parts Descriptions and 2J Tank Installation 16 Order Numbers 2K Two Temperature System 2 30 SECTION 3 SECTION 8 tee m Optional Parts Descriptions and ontr
12. Laars commercial water heaters are available in two models an indoor version and an outdoor version Both are available from the factory see Figure 1 12 Pump PH Models 1 a 483 Inlet Figure 1 Boiler Configuration Page 4 LAARS HEATING SYSTEMS 1C Flow Requirements For proper operation all low volume hot water heaters must have continuous flow through the heat exchanger when firing The system pump must be capable of developing sufficient pressure to overcome the resistance of the heater plus the entire circulating system at the designed flow rate 1D Water Chemistry Laars equipment is designed for use in a wide variety of water conditions The water velocity maintained in the heat exchanger tubes 19 kept high enough to prevent scaling from hard water and low enough to avoid corrosion from soft water Ninety five percent of the urban areas in the country have water that is compatible with this equipment but in some areas a water supply will contain a large quantity of scaling chemicals or the water may be extremely soft and corrosive In rare situations the water will contain both scaling chemicals and corrosive chemicals such as calcium or sodium chloride These conditions may be the result of a nearby well or pumping station and the particular condition may not be characteristic of the entire city water system If an installer observes damage from these conditions to
13. exchanger heater operation With a wire brush remove soot and loose scale from heat exchanger Clean fallen debris from I HEATER WILL NOT FIRE bottom of heater Make sure burner ports are i P Possible Cause What To Do clear and pilot assembly is free of debris d Reassemble in reverse order A Electric power is off A Check to see that main power Be sure the heat exchanger baffles are replaced switch is ON Use testing 8 The gas and electric controls installed on heaters device to trace power to are engineered for both dependable operation heater junction box and long life but the safety of this equipment B Operating or safety control Turn off power Use continuity completely depends on their proper functioning has opened circuit to electric across terminals of each It is strongly recommended that the basic items gas valve operating and safety control be checked by a competent serviceman every switch up to the electric gas year and replaced when necessary The basic a GO controls are a Water temperature controls C Pilot flame is out C Relight pilot per instruction b Pilot safety system Automatic electric gas valve s D Manual reset device has D Follow instructions for start d Flow sensing safety device tripped up Reset Pilot safety and all I manual reset safety switches 9 Low water cutoffs should be inspected every six and reset manual safety gas 6 months including flushing
14. nanometer and adjust with heater firing at full rate E See nameplate for correct fuel F Installations at altitudes in excess of 2000 ft above sea level are subject to jurisdiction of the local inspection authorities LAARS HEATING SYSTEMS Page 22 SECTION 6 Parts Descriptions and Order Numbers 00ZS8003 0069000 OOSZ6E01 00 8E 0 4 001956006 00ZE900S VOELBEOL 0 6 0 L0Sr9C0l 00Sr9c 0l LOEV9EO OOEV9IEN 809 690 51 09 690 7 6087890 7 60Zr8SOL 6O0VVESO 6099 90 4 008 90 4 00Z 90 4 008090 60Z9 90 4 008 I POIN 00298003 00692003 009Z6 0 4 00 8E 0 4 00 6005 00ZE900S VOELBEOL 0 660 LOSV9EN L 00 960 LOEV9EO L OOEVIEN 90 809 660 7 80614690 7 809 4690 80 0 809 690 008 90 4 00Z 90 4 008090 80Z9 90 4 029 lapow 00298003 00652003 OOSZ6E01 OOE8EEOl 001 S600S 00ZE900S VOELBEOL 60616860 LOSV9EN 00 960 LOEV9EN L OOEVIEN 90 09 660 7 Z 08r8SOl 7 LOZVESOL LOVVESO Z0SSESOlL 008 90 4 00Z 90 4 00807904 Z0ZSCS0l 08tL 10001 00298003 00692003 009Z6 0 00 8 0 00 6005 00ZE900S VOELBEOL COEL6EOL LOSV9EO L OOSV9ENl LOEV9EO L OOEVIEN 90 909 660 7 906 690 7 90ZrESOl 90VVESOl 9099 90 4 008 90 4 00Z 90 4 00807
15. 2 00z09901 vOZ8S901 VOLZS9OL vOL8S901 vOZ09901 098 10001 08 1990 L 02 1990 0070990 0 6990 096990 068990 0 169904 080990 026990 2 00SZS901 00206009 0S8S901 066S901 Z Z 00ZZS901 090990 00109901 2 00z09901 0Z8S90l 01L2S90l 0L8S90l 0Z0990l 912 10001 0819901 c0Z1990l 00709901 c0E6S90 1 c0S6S901 c068S901 c016S901 c0809901 c0Z6S901 2 00SZS901 00c0S00 c0S8S901 c066S90 1 2 00ZZS901 c0S09901 00109901 2 00z209901 c0Z8S901 cO01ZS901 c018S901 c0Z09901 009 lapow L08 1990 L L0Z t990 L 00709901 10669590 LOS6S901 LO68S901 LOL6S9OL LO809901 LOZ6S901 Z 00SZS901 00c0S00 LOS8S901 LO66S901 Z 00ZZS901 LOSO9901 00109901 2 00z209901 LOZ8S901 LOLZS9OL LOL8S901 LOZ09901 009 10001 xJ 1012 10 N 4 jeuegwesy 9 01 00 ULed L H G Lz 00620 uo uoneunsniii 51160 99S UMOUS JON xog O41uOO DI IUS 6 Jeay 8 14014 JOUR Z Jaddp jeued 14044 94 PJSIYSPUIM 01 G 100q tl uOIsu x3 seg 14044 10464 043 14044 Z q 92 ules 566 4019491 seg y Ol J uu 468 y 6 8 11 19463 169 9 Ajquaessy 8 1 04 Z 00 50 0 des 1 50 9 deo Jedd
16. LOS LOZO L 0026000 002 9 0 0097200S LOS LOZO L 0026000 002 49 0 0097200S LOS LOZO L slu uu umb xiduind 104 Opoz 1 00 1lu uno 006SS00d 0002200 000 L003 001 L003 0006200 7 009 900V 00 S 00d 0069200d 000 00d 00711004 o00 L004 001606003 00Z8c00d GOZESSOl SOLVESOL 001cOOOM 00817500 OOELSOOA OO99V00A 00491700 0101 I PON 00S9c00d 0098 00d 000 L003 001 L003 0006Z00V OO9E900V 00 S200d 0069200d 000 00d 00711004 0066100 00160600 00Z9c00d4 VOLESSOl VOLVESOL 0016000 008179500 0061500 00991700 0091700 098 I PON 0098000 0098 00d 000 L003 001 t003 0006Z00V OO09E900V 00 S 200d 0069200d 000 00d 00711005 0066100 00160600 0028000 0Z 990 cOLVESOl 00 COOOM 00817500 0061500 00991700 0091700 GLZ I PON 00S9c00d 0098 00d 000 L003 001 t003 0006Z00V 009 900V 00 9c00d 0069c00d 000 00d 00711004 00 amp e L004 00L8c004 0028000 cOLEGSOl cOLVESOl 001 cOOOM 00817500 0061500 OO99V00A OO99V00A 009 I PON 00S9c00d 0098 00d 000 1003 001 L003 0006Z00V 009 900V 00 9c00d 0069c00d 000 00d 00711005 0066100 00L8c004 0028000 LOZESSOl LOZVESOl 001cOOOM 00817500 0061500 00991700 OO99V00A 009 19001 1 6 L X l
17. Start Up Boiler Be certain system pump is running then proceed as follows ON POSITION Pilot Valve Main Gas Valve Pilot Valve OFF POSITION Main Gas Valve Figure 19 Gas Manual Valves a Turn off main electrical switch b Turn off all manual gas valves and wait five minutes see Figure 19 c Set operating control to lowest setting Slowly turn manual gas valve to ON e Reset all safety valve switches manual reset high limit and low water cut off f Open manual pilot valve Turn on main electrical switch g Set temperature controller to desired temperature Pilot will light automatically to ignite main burners whenever the aquastat calls for heat For standing pilot system press on pilot relay knob see Figure 20 light pilot and keep relay knob Pilot Reset Switch Figure 20 Pilot Safety Relay Mighty Therm Volume Water Heater Page 19 depressed for one minute then release Once the pilot is lit the power is supplied through the aquastat to the main gas valve 2 To set the temperature and high limit controls When using a tank aquastat Set the tank aquastat to the desired tank temperature Set the heater temperature control 20 F higher than tank aquastat Set the manual reset high limit 50 F higher than tank aquastat Example If desired temperature is 140 F set the tank aquastat at 140 F set the heater temperature control at 160 F and set the manual reset hig
18. Volume Water Heater 0c60004 OO0cVIENl 0097200S LOS LOZO L 006SS00d 00 00d 000 L003 001 L003 0006Z00V OO9E900V 00 S 200d 0069 00d 000 00d 00711005 00 amp e L004 0018c004 00Z9c00d4 60Z 990 4 6O0ZVESOl 00 2000 006179500 00171500 00491700 00891700 9081 I DOIN 0026000 002 9 0 0097200S LOS LOCO L 006SS00d 000 00d 000 L003 001 L003 0006Z00V OO9E900V 00 S 200d 0069 200d 000 00d 00711004 0066100 00 160600 0028000 80ZESS01 80ZVES0l 001 cOOOM 00617500 00171500 00491700 00491700 0291 I PON 00260004 00ct9c 0l 0097200S LOS LOCO L 006SS00d 0002200 000 L003 001 L003 0006Z00V 009 900V 00 9c00d 0069c00d 000 00d 00711005 00 amp e L004 0012004 0028000 ZOLESSOL LOLVESOl 001cOOOM OO6VSO0A 0061500 00491700 OOZ9VO0A 086 I DOIN 0026000 002 9 0 0097200S LOS LOZO L 006SS00d 0002200 000 L003 001 L003 0006Z00V OO9E900V 00 S200d 0069 200d 000 00d 00711004 0066100 00L8c004 0028000 90ZESSOl 90ZVESOl 00 000 0087900 0061500 00991700 00491700 002 I DOIN 0026000 002 49 0 0097 00S LOS LOZO L siwu u o 0 5 lllupnoO z s YOeS JO 00110 081 Apuenb 1lu s id 1 u SIBQUINN ALON 0026000 00249 0 009 20005 LOS LOZO L 00z60004 00crt9c 0l 0097200S
19. above heater Install new valve with psi setting 25 ll HEATER IS POUNDING KNOCKING OR EMITTING STEAM FROM RELIEF VALVES Possible Cause What To Do A Low or no water flow A This condition is usually caused by lack of adequate water flow through heater Check the following 1 Is the heater wired into the pump circuit so that the heater above required static system working pressure Do not exceed 160 psi cannot fire unless the pump is running 2 Check to see that all valves in system are open to be sure that water can circulate through the heater and the system 3 If the system has automatic water valves 2 way or 3 way that can cut off the water flow through the heater check to see that they are equipped with end switches which shut the heater down when the water flow through the heater is reduced by 70 from full flow 4 Examine pump for clogged impeller B Expansion tank is water logged if installed Drain expansion tank then reopen it to the system Look for leaks in expansion tank or fittings Calculate required volume of expansion tank in relation to system to determine if tank is adequate V SOOT INFLUEWAYS OR IN TUBES OR NOXIOUS FUMES INDICATIVE OF BAD COMBUSTION Possible Cause What To Do A Combustion air supply to A Check air supply opening heater room is inadequate Look for debris in screen or louvre which covers combustion air opening or for material blocking t
20. apply to non combustible materials because the heater requires air circulation for proper operation Heater should be mounted on a level surface An integral combustible flooring base is provided as standard equipment on outdoor models Indoor models can be installed on a combustible floor with a special base assembly which is available from the factory or with a base that complies with local code requirements See rating plate for part number of the base assembly Do not install a heater on carpeting Under the National Fuel Gas Code ANSI Z223 1 itis permissible to place the heater on floors other than non combustible when the installation complies with the American Insurance Code Figures 2 3 4 and 5 show common installation on combustible flooring 2B Installation of Indoor Heaters 1 Locate the water heater to provide adequate clearance for inspection and service on all sides see Table I We recommend minimums of 24 from front for proper access to and service of controls and 18 at water connection end For alcove installation see Figure 6 2 Install the heater on a waterproof floor with an adequate floor drain and a 6 minimum curb on all four sides to protect the building if heater repairs are required The manufacturer will not be held liable for any water damage in connection with this heater Outdoor inches Clearance Indoor From inches Top 30 unobstruct Water Conn Side 12 24 Opposite Side 6 24 Fr
21. jeued 1 JaANO7 168 1 ddN PISIYSPUIM 169 Ajquwessy 8 dol WN Q LO ON uondu5s q Aey Page 31 Mighty Therm Volume Water Heater 60702901 60699901 60 amp c0901 6022990 600 9901 P 60229904 t 60S19901 601 c9901 SZ8L I DOIN 80702901 8069990 80 0090 8020990 8002990 90 80229901 r 80S19901 801 9901 0291 I PON Z0v0Z901 20659901 Z0 0901 Z0cc990l Z00c990lL 90 Z0ZZ9901 r ZOSL9901 0 0990 06 I DOIN 90702901 9069990 90 2090 90cc990l 900 9901 90 90229901 r 90S19901 901 9901 002 I PON SOv0Z901 S06S9901 SO0Ec0901 9020990 9002990 P GOZZ9901 t S0S1990L 90 0990 0101 I DOIN siwu u o BUN 5 lluenoO 8ZIs 4068 JO p uinb i Ayuenb 1lu s id 1 Ul siSquinN ALON vOvOZ901 v06S9901 70 0090 v0cc9901 v00c9901 7 7047990 t 709990 70 0990 068 I PON 0r0Z90l 069990 0 0090 0cc990l 00c990l 6047990 2 0S19901 01 c9901 GLZ I PON cOvOZ901 c06S9901 c0 amp c0901 c0cc9901 c00 c9901 ZOZZ9901 2 Z0S1990L c01c9901 009 I PON LOvOZ901 LO6S9901 LOecO90l LOcc9901 LOOc9901 Z 10ZZ9901 2 06990 1010990 009 10001 JAYDIN Oudny Ajquaessy qnL Jaddoy Ajquiessy qn woddns eseg 1012 02
22. oiling 7 The pump should be accessible for lubrication inspection and service 8 If pump is designed for floor mounting install securely on concrete block or pad at least six 6 inches above floor level This will prevent flooding of motor when floor is washed Be sure that floor mounted pumps are not suspended from piping and that piping is plumbed to avoid strain on the pump casing Mighty Therm Volume Water Heater Page 11 With Vertical Tank With Horizontal Tank O x rs O NOTES Heavy line __ indicates Heater to Tank Circulating Loop Figure 11 Hot Water Supply System Model VW amp PW Page 12 LAARS HEATING SYSTEMS Figure 12 Hot Water Supply System Using Model PW with Dual Tanks Building Loop Return and Circulating Pump Flow Switch Factory Mounted Pressure and Wired Relief Building Loop Valve Minimum Building Loop Pipe Size Circulator 1 Thru 850 S S See Note 3 1 1 4 1010 Thru 1825 Service Valves For Heater Isolation Gas Supply N ZG lt S 5 NE gt A Pp Pe Valve Model IW 7 gt Cold Water Water Heater Supply E 0 Check Valve Connections To Building Service Building Loop Circulator See Note 3 This Segment Of Piping Must Be Same Size As Water Heater Connection CAUTION 1 This piping arrangement is required on split systems to provide constant hot water temperatures 2 Pipe size and length must conform to
23. the National Fuel Gas Code ANS1 2223 1 National Electrical Code ANSI NFPA 70 and or in Canada CAN1 B149 requirement When required by the authority having jurisdiction the installation must conform to American Society of Mechanical Engineers safety codes for controls and safety devices for automatically fired heaters No CSD 1 and in Canada CGA 3 3 Any modification to the water heater its gas controls gas orifices wiring or draft diverter may void the Laars warranty If field conditions require such modifications consult factory 1B Heater Identification Consult rating plate on the heater The following example simplifies the heater identification pi 2 s 4 5 e Pw 1160 1 N e Basic heater model Input rate X 1000 BTU hr Indoor 1 or Outdoor E installation Gas type Natural N or Propane P ee oe a m Ignition system I I D 09 or continuous pilot 16 6 Firing rate On Off C 2 stage K 4 stage L Model VW water heaters for use with separate storage tank There must be a field installed pump to circulate water between the heater and the storage tank Model PW water heaters are basically the same as the VW series except that the PW heaters come with integrally mount pumps Model IW water heaters are tankless instantaneous heaters complete with mount pump for use in applications having a suitable diversity in heater load Special Options L I D 04 115 volts
24. the recommendations for each heater model 3 A loop circulator is required to maintain forced circulation in the building hot water piping system Figure 13 Split System Piping Diagram Model IW Mighty Therm Volume Water Heater Flow Switch Factory Mounted and Wired Gas Supply Heater Isolation lt Drain Drain Valve See Note 2 A Service Valves For Available In Stage Or Modulated Firing Cold Water Supply NOTES 1 All water connections 2 N P T models 2 Drain valve per ASME requirements Page 13 Model IW Water Heater This Segment Of Piping Must Be Same Size As Water Heater Connection Service Valves For Heater Isolation Building Loop To Minimum Pipe Size 1 Thru 850 1 1 4 1010 Thru 1825 T Building Loop Circulator N lt lt See Note 3 S To Building Service Connections 3 A loop circulator is required to maintain forced circulation in the building hot water piping system Figure 14 Dual Installation Piping Diagram Model IW Model IW Water Heater Gas Supply Flow Switch Factory Mounted and Wired Drain Valve See Note 2 Check Valve NOTES 1 All water connections 2 N P T models 2 Drain valve per ASME requirements This Segment Of Piping Must Be Same Size As Water Heater Connection Service Valves For Heater Isolation Check Valve Building Loop Circulator See Note 3 To Building Service Connections Building Loop 3
25. to outside air one within 12 inches of the ceiling and the other within 12 inches of the floor Each opening should have a minimum free area of one square inch per 4 000 BTUH input of the total input rating of all appliances in the enclosed area See Table 2 for recommended air supply for each model An improperly ventilated equipment room can get excessively hot and cause accelerated deterioration of controls and electrical components IMPORTANT In beauty shops barber shops cleaning establishments and self service laundries with dry cleaning equipment it is important that the water heater be installed in a location where Heater Each Opening Model Square Inches Net Free Area in Square Inches Area indicated is for one of two openings one at floor level and one at the ceiling so the total net free area could be double the figures indicated For special conditions refer to the latest edition of ANSI 2223 1 Consult factory if not communicating directly through the walls with the outdoors Note Check with louver manufacturers for net free area of louvers Correct for screen resistance to the net free area if a screen is installed Check all local codes applicable to combustion air Table 2 Minimum Recommended Air Supply to Boiler combustion and ventilation air 15 received from a source outside the building Please refer to the most recent edition of the National Fuel Gas Code ANSI Z223 1 or in Canada CGA req
26. 12 of Terminal Strip WIRING CODE BK Black R Red Factory Wiring Field Wiring BR Brown W White 110 Volt O Orange Waterpik Technologies Inc 6000 Condor Drive Moorpark CA 93021 805 529 2000 FAX 805 529 5934 20 Industrial Way Rochester NH 03867 603 335 6300 FAX 603 335 3355 480 S Service Road West Oakville Ontario Canada L6K 2H4 905 844 8233 FAX 905 844 2635 HEATING SYSTEMS www laars com Litho in U S A Laars Heating Systems 0011 Document 2040D
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28. H0105000D Installation and Operation Instructions Document 2040D Installation and Operation Instructions for Mighty Therm Volume Water Heaters Models VW PW and IW Sizes 500 1825 These instructions are to be stored in the pocket provided on the boiler FOR YOUR SAFETY This product must be installed and serviced by a professional service technician qualified in hot water heater installation and maintenance Improper installation and or operation could create carbon monoxide gas in flue gases which could cause serious injury property damage or death Improper installation and or operation will void the warranty AWARNING If the information in this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your gas supplier from a nearby phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or gas supplier HEATING SYSTEMS Page 2 LAARS HEATING SYSTEMS TABLE OF CONTENTS SECTION 1 JC To Start Up System 18
29. L 00 z9001 9069 90 2 00 LZ 004 0022 90 0089 90 00198005 00600103 002 I PON o0ct000A OOEVOOOA g00ct90 L G0ZScS0l SOZcVvSOl 9069 090 G06cSS0l Zr 00628007 Zr 00Z0S007 G06ScS0l OOEVEOOM OOSVEOOM OOVVEOOM 00917800 OO8SE00M OOZVEOOM cOG6cS01 LOS6cS01 00 amp cS00 1 g069 90 2 00 128003 0022 90 0089 90 00198005 00600103 OLOL I DOIN siwu u o uo 5 yueLeno z s 4068 101 p uinb i Alluenb 1lu s id 1 Ul siSquinN ALON 00817000 002 000 002490 F0ZScS0l F0ZcrS0l 7 0 090 v06cSS01 98 00628007 98 00209007 F06ScS0l OOEVEOOM OOSVEOOM OOVVEOOM OO9VEOOM OO8SE00M OOZVEOOM c0S6cS0l LOS6cS01 00 amp S00 vO69ESO 2 00 128003 0022 90 0089 90 001980035 00600104 098 I DOIN OO8VO00A 002 000 00ct90 L 0Z9c90 4 0Zct90 4 0 9c90 L 06c990 4 08 0062800 08 00209007 069c90 OOEVEOOM OOSVEOOM OOVVEOOM OO9VEOOM OO8SE00M OOZVEOOM 0S6cS0l LOS6cSO01 00 amp S00 1 069 90 2 00 2 800 0022 90 0089 90 00198005 00600104 912 I PON OO8VO00A OOcVOO0A cO0cVvSOl c0ZScS0l cOLcvS0l c0CScS0l c06cSS01 9z 00628007 9z 00209007 c069c90 OOEVEOOM OOSVEOOM OOVVEOOM OO9VEOOM OO8SE00M OOZVEOOM 0S6cS0l LOS6cS01 00 amp S00 1 c069 90 I 2 00 2
30. ZZVOOA g OOLL OOA 2 0060700 2 006600 00491700 090990 0c L990 4 Z0E 0E 0 Z0Z0SS01 Z096 S01 Z090SS01 OOV8EEO 00 amp Z00d 0002 c00d Oeti I PON 008179500 OOZZVOOA g OOLL OOA 2 0060700 2 00 0700 cOSOSSOl cOclLSSOL 90E0SS01 90Z0SS01 9096 S01 9090990 OOV8EE0l 00 2200 0002000 002 I PON OO8VSO00A OOZZVOOA g OOLL OOA z 0060200A 2 00 0700 LOSOSSOl LOcLSSOL g0 0990 9020990 G096cS0l 9090990 4 OOV8EEOl 00 Z00d 0002c00d OLOL I PON siwu u o uo 5 yueno 216 4068 101 p uinb i Anuenb 1lu s id 1 Ul SIBQUINN ALON 00817500 00941700 0011200 0019700 2 0060700 2 00 0700 vOEOSSOl vOLOSSOl vOEOSSO vOZOSSOl vO962S01 vO90SS01 OOV8EEOl 00 200d 0002c00d 0S8 I PON 00817500 00941700 OOLL OOA OOLSVOOA 2 0080700 2 0098600 0 0990 0Z0990 4 0 0990 02Z0990 096290 090990 L 00 8 0 00 Z00d 0002000 912 I PON 00817500 00941700 0011200 0019700 Z 00807200A 2 0096S00A c0C0SS0l c0Z0SS0l 0C0SS0lL cOLOSSOl 9096090 c090SS01 OOV8EE0l 00 Z00d 0002 c00d 009 I DOIN 00817500 OO9ZVOOA OOLLZOOA OOLSVOOA 2 0080700 2 0096S00A LOEOSSOl LOZ0SSO01 LOEOSSOl LOZOSSOl LO96cS01 LO90SS01 OOV8EE0l 00
31. any water handling equipment in the area a factory representative should be contacted immediately for assistance in minimizing maintenance costs If erosion is present the pump impeller can be replaced to reduce water velocity If scaling conditions are bad tube cleaning maintenance schedules can be established to prevent tube burn out and cracking Neglecting the problem could mean serious damage to the heater and water system Scaling can be recognized as a layer deposited on the inner walls of the tube which reduces the inner diameter of the tube Scale can be any color or texture smooth or rough granular or amorphous Signs of erosion are generally pitting cavitation ridges and islands on the inner walls of the tubes Since this condition results from extremely soft water sources or as aresult of a water softening program the internal copper surfaces will be extremely shiny Other chemicals such as chlorine or chlorides in the water will cause dark surfaces of erosion In areas where the water supply is extremely corrosive it is advisable to order the heater with cupro nickel tubes in the exchanger Damage From Scaling Corrosion or Erosion is Not Covered by the Warranty SECTION 2 Installation 2A Heater Placement The heater must be placed to provide specific clearances on all sides for maintenance and inspection There must also be minimum distances maintained from combustible surfaces These clearances also
32. ause hammer and cavitation in the pump and damage the heater through lack of water circulation If for any reason the water supply is turned off temporarily to service a piece of equipment the manual gas valve on the Model IW should be closed until the water pressure has been restored and the lines bled of accumulated air If the heater fails to fire when it 15 turned back on it may be airlocked To eliminate the airlock open the pressure relief valve and allow air to bleed out until water flows As soon as full circulation is resumed the entrained air will be carried out through the hot water faucets 2J Tank Installation 1 Be sure the floor is waterproof and structurally capable of supporting the tank when it is filled with water 2 The tank should be placed so that manholes inspection covers nameplates and drain valves are accessible 3 Be sure the tank is suitable for the water in the system Some water is corrosive and requires a protected tank with a special lining 4 If the tank 15 glass lined it should be equipped with a suitable magnesium anode It is good practice to replace the anode when it is approximately 50 used The factory warranty on a glass lined tank will be void if a satisfactory anode is not in place at the time of a failure or if it is consumed by cathodic action 5 Make sure the tank connections in the heater tank circulating loop are the proper size as listed in Section 2H If tappings are sma
33. ectrically interlocked so the heater cannot come on unless the pump is running 4 All field installed electrical safety devices and all field installed devices draft switches relays timers outdoor temperature reset devices etc can be connected to the heater wiring at points shown in the wiring diagram designated Field Interlock 2F Water Piping of System 1 Be sure to provide valves at the inlet and outlet of the boiler so it can be readily isolated for service A butterfly or similar type of valve is recommended 2 The pressure relief valve installed in the tapped opening provided in the outlet header see Figure 9 must be piped but not fastened to a drain or floor sink The drain pipe must be the same size as the valve outlet and must pitch downward from the valve Mighty Therm Volume Water Heater Pressure Figure 9 Pressure Relief Valve Location Special attention must be given to relief valve settings in installations where the heater is located on the ground floor of a tall building The static pressure of the system is elevated and could cause the relief valve to leak Where no special setting of the relief valve is ordered the factory will furnish a 125 psi setting Never reduce the relief valve openings 3 Pressure relief valve lever must be tripped at least once a year to insure that waterways are clean When manually operating lever water will discharge through drain line Precautions
34. er structures such as garages or utility rooms see Figure 7 Although these models are AGA and CGA designed certified for outdoor installations such installations are not recommended in areas where Table 3 Gas Piping Sizes Page 8 LAARS HEATING SYSTEMS Gas Supply To Inlet Equipment Inlet Nipple gt Cap Figure 8 T Fitting Sediment Trap Installation 4 The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1 2 psig The boiler must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1 2 psig 5 Provide gas supply pressure to the heater as follows NawalGas LPG Min inches Per Rating Plate o Note The heater and all other gas appliances sharing the heater gas supply line must be firing at maximum capacity to properly measure the inlet supply pressure Low gas pressure could be an indication of an undersized gas meter and or obstructed gas supply line water column Max inches water column 6 The correct burner manifold gas pressure is stamped on the rating plate The regulator is preset at the factory and normally requires no further adjustment 7 The gas manifold and control assembly was tested and confor
35. erm Volume Water Heater Page 15 140 F Water I Return From 180 F Water Bldg Return From Bldg 180 F Water Pump To Q PW Series 6100 VW Series Conventional Tank 140 F Water To Bldg D lt vA Cold 3 Water BO t x Pump To Drain PW Series VW Series Cold Water Legend B Check Valve C Check Valve D Tempering Valve H Throttling Valves in Building Loop Returns J Circulating Pump for Return Loop K Service Valves to Isolate Heater and Pump for Service Figure 17 Two Temperature Hot Water Supply System with Vertical Tank for Models VW and PW Water Heaters LAARS HEATING SYSTEMS Temp Rise Across Category Heater F Soft Normal Hard Soft Normal Hard Water Category Soft 1 through 7 5 Normal 7 6 through 17 Hard Over 17 Grain Hardness per Gal Pressure drop includes loss through 30 feet of pipe and normal fittings when heater is installed with storage tank Pipe and fittings are assumed to be 2 on Models 500 850 and 2 1 2 on Models 1010 1825 To prevent erosion these models must be ordered with cupro nickel heat exchanger tubes Table 4 Pump Performance Requirements 2l Water Pressure It is very important that water pressure in the system be maintained above 30 psi If the system pressure should drop below this the vapor pressure of water in the suction side of the pump can c
36. ery six 6 months thereafter the pilot and main burner flame should be observed for proper performance see Figure 21 See attached lighting and shut down instructions for proper pilot flame pattern If flame has the Figure 21 Main Burner Flame Pattern appearance of sooting tips check for debris near orifices Call serviceman 4 Inspect the venting system for obstruction leakage and corrosion at least once each year 5 Keep heater area clear and free from combustible material gasoline and other flammable vapors and liquids see Table for minimum clearances 6 Becertain all combustion air and ventilation Openings are unobstructed 7 Check for fouling on the external surfaces of the heat exchanger every six months NOTE After installation and first start up check the heat exchanger for fouling after the following periods of operation 24 hours 7 days 30 days 90 days and once every six months thereafter Fouling on the external surfaces of the heat exchanger is caused by incomplete combustion and is a sign of combustion air and or venting problems As soon as any fouling is observed the cause of the fouling should be corrected see Section 5 Troubleshooting Guide The heat exchanger can be checked by locating a mirror under the burners with a flashlight An alternate method is to remove the venting and top panel as necessary to inspect from above Also check the vent system for defects a
37. h limit at 190 F If the heater is equipped with a pump time delay the three position switch on the side of the heater can be put into the Auto Pump pposition so that the pump will only run when the tank aquastat calls for heat then when the call for heat is satisfied the heater will turn off but the pump will run for the set amount of delay time adjustable between 0 1 and 10 minutes When a tank aquastat is not used The pump on the heater must run continuously so the heater s temperature control will sense the tank s water temperature Set the heater temperature control to the desired tank temperature Set the manual reset high limit 50 F higher than the heater temperature control Example If desired temperature is 140 F set the heater temperature control at 140 F and set the manual reset high limit at 190 F 3D To Turn Off Heater 1 Turn off main electric switch 2 Close all manual gas valves 3E To Shut Down System To shut down heater turn off all manual gas valves and electrical disconnect switches Whenever danger of freezing exists shut off water supply and remove drain plug in the bottom of front header cover Drain every part of system subject to freezing temperature SECTION 4 Maintenance 1 Lubricate the water circulating pump see instructions found on the pump 2 Ifa strainer is employed in a pressure reducing valve or in piping clean it every six 6 months 3 At start up and ev
38. he opening B Low or no system pressure B Clean strainer in pressure reducing valve Look for closed valve water line or a leak in the system C Clogged Y strainer C Remove strainer element and clean screen D Debris from system piping D Remove header covers is blocking tubes Examine all tubes and B Look for blocked stack and excessive number of elbows in stack or excessive length of horizontal runs B Stack or vent is blocked or restrictive E Scale has formed in tubes lll WATER DRIPPING IN FIREBOX Possible Cause What To Do Tube in heat exchanger has overheated and ruptured waterways Use new gaskets when reassembling Clean out tubes E This is always caused by the inflow of raw water into the system Clean tubes with tube cleaning kit Determine hardness Check water flow replace pump for modified flow if necessary A tube failure is almost always caused by a scale formation in the tube or b inadequate water flow through the boiler C Severe down draft is causing spillage of flue products into room D Gas pressure to burners is excessive E Heater not fitted for the fuel supplied F Heater installed at high altitude without proper derating C Check for 1 proper vent cap on stack 2 adequate height of stack above roof 3 equipment exhausting air from inside of building and 4 proper installation of draft diverter D Check gas pressure with
39. ing flue products into the heater room Avoid oversize vent piping or extremely long runs of the pipe which may cause excessive cooling and condensation Rule of Thumb The total length of the vent including the connector and any offset should not exceed 15 feet for every inch of vent diameter Longer total lengths shown in venting tables are based on maximum capacity not condensation factors When the installation of a draft fan is necessary Window Or Grill Figure 7 Incorrect Outdoor Installation the danger of freezing exists unless proper precautions are taken for freeze protection 2D Gas Supply and Piping Review the following instructions before proceeding with the installation in connecting a venting system to a Laars heater 1 Verify that the heater is fitted for the proper type the installation should be engineered by of gas by checking the rating plate Laars heaters competent personnel following good engineering are normally equipped to operate below a 2000 practices The draft fan supplier should be foot altitude Heaters equipped to operate at consulted for correct size The installation should higher altitudes have appropriate stickers or tags be in accordance with the latest edition of ANSI attached Z223 1 and or in Canada CAN1 B 149 2 Use the figures in Table 3 to provide adequate requirement and any local codes having gas piping from the gas meter to the heater jurisdiction When a draft fan 15 instal
40. led a suitable draft switch must be wired into the 3 A trap drip leg must be provided ahead of the heater control circuit at terminal designated Field Interlock to prevent firing of the heater unless a positive draft has been established Installation of Outdoor Heaters Locate the heater to provide the minimum clearances as listed in Table 1 Placement of Heater Do not place the heater in an enclosure or wall recess Avoid locations where wind deflection off structures might cause down draft When such wind conditions are possible place the heater at least three 3 feet from the structures Never install the heater under any kind of roof overhang Do not place the heater below or gas controls see Figure 8 A manual gas shutoff valve must also be provided for service convenience and safety Check the local codes Distance from Gas Meter or Last Stage Regulator 01400 100 200 200 300 2 2 1 2 2 1 2 2 1 2 3 3 3 3 3 1 2 Note These figures are for Natural Gas 65 Sp Gr and are based on 1 2 water column pressure drop Check supply pressure with a manometer and local code requirements for variations For LPG reduce pipe diameter one size but maintain a 1 minimum diameter A normal number of Tees and elbows have been taken into allowance adjacent to any doors windows louvers grills etc which connect in any way with an inhabited area of a building This includes oth
41. ler than the following O wa pese _ 2 1 2 500 through 850 1010 through 1825 3 To assure free circulation do not use globe valves side outlet tee connections or other restrictive fittings in heater to tank loop 2 The Model IW heater is designed for use in a system without a hot water storage tank The hot water supply line to usage point must have a return leg to the heater see Figure 13 14 and 15 A built in circulating pump and internal heat exchanger bypass maintains the heater in a standby condition It also maintains the temperature at the controller setting of the water in the entire building circulating loop whether or not there is any use of hot water A separate circulating pump is required for circulation of water in the building loop The control system provides variable heat inputs to match periods of higher or lower water consumption 3 The Model IW heater requires a minimum of circulating hot water in the building circulation loop To prevent excessive temperature fluctuations in the delivered water the whole building system including the return loop must have the equivalent volume of pipe shown below Minimum Reservoir Gallons Equivalent Pipe Model IW Size and Length 500 through 850 O 3 1 1 4 x 100 ft x 100 ft x 100 ft x 100 ft 1010 through 1220 1430 through 1670 4 Model VW PW and IW heaters are not suitable for heating swimming poo
42. ller than the recommended pipe size a larger pump may be required Consult the factory if in doubt 6 Install a pipe in the tank drain fitting that goes to a floor sink and install a drain valve If a floor sink is not available install a hose bib 7 Hot water tanks in an existing installation are likely to have a deposit of silt on the bottom Therefore it is important to extend the pump suction pipe in the tank to a position near the top Pipe the return from the heater to the bottom of the tank 2K Two Temperature System See Figures 16 and 17 for piping schematics This system is designed to maintain the tempered water circulating loop at the desired temperature during idle periods as well as when there is a demand for hot water It is recommended for general purpose water supply including shower and bathing applications Water at 180 F is available directly from the tank SECTION 3 Operation 3A Controls General 1 Electronic Ignition Controls a Intermittent Ignition Pilots are automatically lit when the operating aquastat calls for heat System 9 and 4 The unit performs its own safety check and opens the main valves only after the pilot is Mighty Therm Volume Water Heater Page 17 proven to be lit Whenever the pilot flame is interrupted the main gas valve closes within piano 1 2 3 4 5 6 7 3 oa b Electronically Supervised Standing Pilot 0 8 seconds System System 16 When pil
43. ls or any other application where temperature of the water flowing through the heater remains below the dew point 110 F In applications requiring the rapid use of measured volumes of water the recovery of the heater between the time intervals of use must equal the volume used See the recovery table in the current Document 2045 Submittal Data 5 Pump Sizing A suitable pump must be field provided for circulation of water between Model VW heaters and the storage tank This pump must be sized to avoid excessive temperature rise and to provide correct flow for water hardness conditions Specifications in Table 4 include allowance for 30 feet of piping and normal fittings between heater and tank 6 Install pump in a cool location When pump is installed where it is subjected to excessive heat the life of the pump will be shortened Heat will embrittle motor insulation and dry out bearing lubricants 11 the pump motor 15 equipped with thermal protection excessive heat may trip the thermal switch and shut down the pump intermittently This could result in rapid scaling of the heater IMPORTANT Check oil level in pump before starting Oil pump every three 3 months Fill bearing assembly to lower level of overflow vent Add five 5 or six 6 drops of oil to front and rear of motor Use 20W non detergent oil Pumps located in excessively hot or dusty locations should be oiled once a month Self lubricating pumps do not require
44. m to the safe lighting and other performance criteria specified in the latest editions of ANSI Z21 13 and CGA 3 3 Low Pressure Boiler Standard 8 Before operating the boiler the complete gas supply system and all connections must be tested for leaks using a soap solution Do not use raw flame Caution Since some leak test solutions including soap and water may cause corrosion or stress cracking the piping must be rinsed with water after testing unless it has been determined that the leak test solution is noncorrosive 2E Electrical Wiring AQAWARNING The heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code ANSI NPA 70 In Canada all electrical wiring to the heater should be in accordance with the Canadian Electrical Code CSA C22 1 Part 1 Do not rely on the gas or water piping to ground the metal parts of the heater Oftentimes plastic pipe or dielectric unions isolate the heater electrically Service and maintenance personnel who work on or around the heater may be standing on wet floors and could be electrocuted by an underground heater 1 Check heater wiring and pump for correct voltage frequency and phase If the pump circuit is other than 115V check to see that the heater is provided with an appropriate transformer 2 Wire the heater and pump exactly as shown in the wiring diagram supplied with the heater 3 The pump and heater must be el
45. must be taken to avoid contact with hot water and water damage 4 The weight of all water and gas piping should be supported by suitable hangers or floor stands 5 Check piping diagrams with local applicable plumbing heating and building safety codes 6 All two temperature systems using temperature valves must have forced recirculation in the low temperature building loop 7 A check valve installed at the hot water inlet to the tempering valve will prevent cold water from being drawn in reverse through the tempering valve into the hot water 8 When installing a tempering valve place at bottom of antithermosyphon loop at least 24 high to prevent excessive hot water from entering mixed water supply Bring the cold water supply up from the floor to the valve see Figure 10 Page 9 Tempered Water Hot Water Hot Water Storage Automatic Floor Tempering Figure 10 Tempering Valve Installation 2G Water Expansion When cold water is heated the water expands If no water is being used during the heat up period the expanded water will normally back up into the city mains A water pressure reducing valve installed in the incoming cold water line may act as a check valve and prevent the expanded water from moving backward This will cause pressure to rise in the heater which will be relieved by the pressure relief valve If the relief valve pops frequently a mineral deposit may build up on the valve seat cau
46. of float types valve NOTE Warranty does not cover any damage E No gas pressure to burners E Trace gas line to service caused by lack of required maintenance or improper a S t ti r open trace gas line to meter operaung Practices If no pressure is present at 10 Both modulating and stage valve are adjusted at meter call for public utility the factory for minimum permissible rates and service If gas is present in should not be readjusted heater inlet check pressures in following sequence 1 downstream from pressure regulator 2 downstream SECTION 5 from electric gas valve Replace or adjust as Troubleshooting and Analysis of Service Problems F Electric gas valve operator is Disconnect wiring harness at l For proper service and problem diagnosis of the burned out or shortened gas valve terminals Check heater and heater system the following tools are U m Te open circuit or short is required indicated replace coil or a Gas pressure test kit with range from zero operator to 14 W C Either a slack tub manometer or an accurate gas pressure gauge 15 acceptable with proper adapters which will connect to the available fittings in the line and on the gas valve Mighty Therm Volume Water Heater Page 21 IV PRESSURE RELIEF VALVES LEAKING INTERMITTENTLY OR STEADILY Possible Cause What To Do A Static pressure in system A Calculate height of water in exceeds setting of relief valve system
47. ols General 3B Initial Start Up 17 Orger Numbers Mighty Therm Volume Water Heater Page 3 SECTION 1 General Information 1A Introduction This manual provides information for the installation and operation of Laars volume water heaters It 15 strongly recommended that all application and installation procedures be reviewed completely before proceeding with the installation Consult the Laars factory or local factory representative with any problems or questions regarding this equipment Experience has shown that most problems are caused by improper installation Some accessory items are shipped in separate packages Verify receipt of all packages listed on the package slip Inspect everything for possible damage upon delivery and inform the carrier of any shortages or impairments Any such claims should be filed with the carrier The carrier not the shipper is responsible for shortages and damage to the shipment whether visible or concealed AQAWARNING All volume water heaters must be installed in accordance with the procedures outlined in this manual The warranty does not apply to heaters not installed or operated in accordance with these procedures Consult local building and safety codes before proceeding with work The installation must conform to the requirements of the authority having jurisdiction or in the absence of such requirements to the latest edition of
48. ont Alcove Unobsiruct Rear 8 24 Vent Pipe 6 Hot Water Pipes Per Code 1 when using type B Vent refer to Manufacturer s Instructions Per Code Table 1 Minimum Boiler Clearances From Combustible Surfaces Mighty Therm Volume Water Heater Concrete Slab Must Extend Out A Minimum Of 12 On All Sides Base WL lt rail Base For Combustible Floors Concrete Slab 4 Minimum Roof Wood amp Steel Construction Figure 2 Typical Heater Installation with Base for Combustible Floors Example A Mounting Platform Must Extend Out A Minimum Of 12 On All Sides 20 GA Galvanized Sheet Metal Cap Base lt Rail ut Tuy Base For Combustible Floors Flashing Roof Roof Raised Mounting Platform Wood 1 Figure 3 Typical Heater Installation with Base for Combustible Floors Example B 20 GA Base Galvanized als Sheet Metal ju LU Cap Roofing Base for Combustible Floors Roof NURI Bay Flashing 4X4 Stringer Figure 4 Typical Heater Installation with Base for Combustible Floors Example C Base Must Extend Out Min 12 On All Sides Of Heater Frame Page 5 Metal Plate 20 Ga Min Under Entire Heater Concrete Blocks Or Tile lt Min 7 High With 3 Min Air Openings Blocks must provide solid base and be braced so they cannot slip out of place Air openings in blocks must be arranged to provide unobstructed opening through entire width or length of base
49. ot flame fails the ignition control module responds in less than 0 8 seconds and provides 100 safety shutdown 2 Operating Controls a Electrically Operating Controls Single two stage four stage or modulating aquastats are provided in models VW PW 4 and IW heaters to control the desired service water temperature The temperature sensing bulb is located in the heater inlet b Modu snap Valves These valves are furnished in addition to the main electric gas valve when heater is ordered with mechanical modulation Each valve has a remote capillary bulb immersed in a well at the outlet header to maintain a constant outlet temperature Consult Table 5 for desired temperature setting Table 5 Modu Snap Temperature Settings provided The temperature sensing bulb of the switch is always located in the heater outlet Burners will automatically shut down whenever overheating of water occurs Flow Switch Standard on all models Models VW and PW the switch is mounted in the outlet tee connection Model IW the switch is mounted directly in the header outlet The flow switch shuts down all burners in case of low water condition or pump failure Low Water Cut Off The low water cut off automatically shuts off heater whenever water level drops below probe Located at heater inlet model IW and PW and at return header model VW 3 High Limit Controls 3B Initial Start Up The manual reset high limi
50. re 23 Tile Assemblies OOWRNOO 4 T2000100 T2023600 T2006000 8 T2000100 12023600 T2023600 T2006200 When ordering tiles Assembly number is for all tiles Part numbers shown at front of OOWRNOO 4 LAARS HEATING SYSTEMS Page 26 OOEVOOOA OOEVOOOA F0ZScS0l G0ZScS0l F0ZScS0l 60ZcVS0l 60 9c90 4 606990 92 oo6z 007 92 00209007 606ScS0l OOEVEOOM OOSVEOOM OOVVEOOM OO9VEOOM OO8SE00M OOZVEOOM c0S6cS0l LOS6cS01 00 amp cS00 1 6069ES01 2 00 LZ 004 0022 90 0089 90 00198005 00600103 9081 I PON OOEVOOOA OOEVOOOA 0ZScS0l 2 vOZSZSOl 80ZcVS01 80ES S01 806cSS0l OZ 00628007 02 00209007 806ScS0l OOEVEOOM OOSVEOOM OOVVEOOM OO9VEOOM OO8SE00M OOZVEOOM c0S6cS0l LOS6cS01 00 amp cS00 1 8069 90 2 001ZE004 0022 90 0089 90 00198005 00600103 0291 I DOIN OOEVOOOA OOEVOOOA 00ct90 23 6049080 2020790 20 090 Z06cSS0l 09 00628007 09 00209007 Z06ScS0l OOEVEOOM OOSVEOOM OOVVEOOM 00917800 OO8SE00M OOZVEOOM c0S6cS0l LOS6cS01 00 amp 2S00 1 Z069ES01 2 00 2 800 0022 90 0089 90 00198005 00600104 086 I PON o0ct000A OOEVOOOA cO0cVvSOl 2 ZOLSZSOL 90Z cVS01 908S S01 906 SS01 09 00628007 09 00209007 906ScS0l OOEVEOOM OOSVEOOM OOVVEOOM 00917800 OO8SE00M OOZVEOOM c0S6cS0l LOS6ZSO
51. sing it to leak The following suggestions may solve the problem Install a properly sized expansion tank 2 Replace the installed water pressure reducing valve witha suitable valve having a back flow port These valves have a back flow port which allows water to flow backwards when the pressure In the system exceeds the pressure in the mains 3 Install a check valve around the pressure reducing valve to permit reverse flow This will allow the expanded water to back flow into the mains Pressure Reducing Valve To Building 4 Install an auxiliary small relief valve set at 25 psi less than the main relief valve The valve must be piped to a drain and may require occasional cleaning It will bleed off the expanded water and protect the main pressure relief valve from becoming fouled Page 10 LAARS HEATING SYSTEMS 2H Pump Performance and Installation 1 The factory provided pump on PW heaters and the recommended field provided pump for model VW heaters are sized to provide proper circulation through the heater and heater to tank circulation loop see Figures 11 and 12 If the heater to tank circulating loop does not contain more than 6 elbows or 30 feet of pipe use pipe fittings in the loop no smaller than the following weds Pie si 500 through 850 2 1010 through 1825 2 1 2 If the heater to tank circulating loop contains more than 6 elbows or 30 feet of pipe use pipe or fittings in the loop no smal
52. spark ignition 15 initiated until the pilot flame has been reestablished On propane systems unit locks out for safety This sequence should be checked by turning off the manual pilot gas valve and at the same time monitoring the audible sparking at the pilot burner and signal interruption to the main valve AXCaution Propane gas is heavier than air and sinks to the ground Exercise extreme care in lighting the heater when so equipped System 16 Electronically supervised standing pilot system Extinguish the pilot flame by placing the manual pilot valve in the closed position and at the same time begin recording the time it takes for the output signal from the electronic ignition control to be interrupted The signal interruption can be detected either with a test light or a voltmeter The response time should never exceed one second 4 With the pilots lit initial activation of the main burners can be achieved by slowly opening the main manual valve The result should be a smooth lighting of the main burners Hi Limit Checkout After running the heater for a long enough period bring the water temperature within the range of the hi limit and slowly back off the high limit setting until the heater shuts off The main burners should reignite when the hi limit is reset and turned back up to its original setting The heater should now run until it shuts off automatically on operating aquastat 3C To Start Up System 1
53. t gt 10 11 42 28 Tiles see page 23 29 thru 35 Ne 37 N 60 1200 thru 1825 51 52 or 53 48 64 65 100 101 103 104 66 67 102 105 107 108 Modusnap gas valves 62 63 92 thru 99 HH PH Figure 22 Parts Identification LAARS HEATING SYSTEMS Page 24 606 90 607VSS01 6097990 600 190 6060790 23 0001SSOL 6081890 60S0VS01 OOOVESOl OO9LESOL 601701790 606c 90 4 cOLOVSOl LOZOVSOl 2 0096690 70178790 0 8 90 0c8t90 L vOL8VSOl 008 90 062790 9081 I DOIN 806 90 4 8077SS01 809V7SS01 800 190 8060790 2 000960 809LE90 809090 OOOVESOl OO9LESOL 8070VS01 8060690 2040190 020 60 2 009 90 cOvsrvsol 7028790 0890 vO6ZVSOl 029 I DOIN Z06 90 4 Z0VVSSOL Z09VSS01 200 90 Z060VS01 2 O0001LSSOL ZOGLESOL 2090 90 OOOVESOl OO9LESOL ZOvOVSOl L06ZES01 2040190 020 60 2 009 90 4 001781790 LOc8vSOl cOL8vSOl LO6Z7SOl 086 I DOIN 906 90 9077SS01 9097SS01 9001VSOl 9060V7S01 2 000 990 90GLESOL 909090 L OOOVESOl OO9ILESOL 90V0VS0l 9060690 2040490 020 60 2 009 90 LOF8rS0l 0c8rS0l LOL8rS0l 06ZVS0lL 00ZL I DOIN SO6EESOl SOvVSSOl SO9VSSOl SOOLVSOL SO60VS01 2 0001SSOL GOSLESOL SOSOVSOl OOOVESOl OO9LESOL SOVOVSOl g06c 90 4 cOLOVSOl LOZOVSOlL
54. t switches are Before placing the heater in operation be certain provided as standard equipment on all heaters that the heater is filled with water and all air is purged Automatic reset switches are optionally from the system Once the heater is connected to the Rating Plate Ignition Control Manual Pilot Valve Manual Main Gas Valve Safety Gas Valve Operating Gas Valve Figure 18 Single Installation Piping Diagram Model IW Blom en Pressure Relief Transformer Terminal Strip Operating Control Aquastat Hi Limit Page 18 LAARS HEATING SYSTEMS gas supply the automatic safety shutoff devices must be checked 1 Before beginning the tests make sure the main manual gas valve and any other heater firing valves are in the OFF position 2 Make sure the heater s power switch is in the ON position After placing the manual pilot gas valve in the open position and resetting all safety devices high limit pressure switch low water cutoff etc pilot s can be lit following the procedure located on the heater rating plate 3 Once the pilot s is lit and has been established for five minutes the flame failure response time should be checked as follows Systems 9 and 4 Intermittent ignition With this system pilots are automatically lit when the operating controls call for heat If the pilot flame fails for any reason the main valve is shut off within one second and the pilot
55. t this time a If cleaning is required shut off all electrical and gas supply to the heater b To expose the heat exchanger Indoor Models Remove flue pipe top of unit rear upper jacket flue collector rear panel and heat exchanger baffles Outdoor Models Remove vent top assembly rear upper jacket flue collector rear panel and heat exchanger baffles c Remove all burners It is usually more convenient to remove the burner tray assembly Disconnect sensor wire ignition cable or thermocouple generator and pilot gas line Disconnect manifold inlet union s Remove the four 4 retaining screws Grasp burner pilot assembly firmly at the front Push it back disengaging it from the gas orifice Page 20 LAARS HEATING SYSTEMS Lower the front of the burner to avoid damaging b Multi meter with the following ranges pilot shield then remove the burner tray 0 to 500 volts A C O to 1000 ohms continuity Caution c Tube cleaning kit consisting of reamer Black carbon or green soot on a dirty heat stainless steel brush speed handle and exchanger can under certain conditions be handle extensions ignited by a random spark or open flame To d Heater thermometer with 1 2 NPT well prevent this unlikely occurrence dampen the 100 240 F soot deposits with wet brush or fine water 2 In addition the heater should be equipped with a spray before servicing or cleaning the heat system pressure gauge with proper ranges for
56. uirements 3 a In the United States Exhaust Fans or Vents Any equipment which exhausts air from the heater room can deplete the combustion air supply or reverse the natural draft action of the venting system This could cause flue products to accumulate in the heater room Additional air must be supplied to compensate for such exhaust The information in Table 2 is not applicable in installations where exhaust fans or blowers of any type are used Such installations must be designed by qualified engineers b In Canada Follow Canadian standard CANI B149or local codes If a blower or fan is used to supply air to the heater room the installer should make sure it does not create drafts which could cause nuisance shutdowns of the pilot If a blower is necessary to provide adequate combustion air to the heater a suitable switch or equivalent must be wired into the heater control circuit to prevent the heater from firing unless the blower is operating The heater must be completely isolated and protected from any source of corrosive chemical fumes such as trichlorethylene perchlorethylene chlorine etc 2B 2 Venting Laars heaters have built in draft diverters for natural draft operation and must not be connected to any portion of a mechanical draft system under positive pressure The flue outlet must be connected to a clear unobstructed vent of adequate capacity ending above the highest point of the building with an appro
57. utdoor Reset Two Stage 30 Bulb Low water Cut off Electronic Manual Reset Low water Cut off Electronic Automatic Reset With Test Button A0048700 A0077100 A0071000 A0054400 A0020200 A0021600 A0022100 A0021400 A0065100 A0058100 A0058200 A0058400 A0071200 A0047500 A0077200 A0054800 A0020200 A0021600 A0022100 A0021400 A0065100 A0058100 A0058200 A0058400 A0071400 A0047700 A0077300 A0055600 A0020200 A0021600 A0022100 A0021400 A0065100 A0058100 A0058200 A0058400 E0014400 E0023300 E0023500 A0014200 E0067600 E0084200 E0067900 E2024200 Gas valve types and sizes vary with different boiler models with different fuels and with different firing options For service and replacement copy exact number from nameplate giving manufacturer s name and pipe size H0105000D JIN HOT _ _ BK 2 TT JN To H of Energy Management Monitor EM P fof BL Low Water STANDARD COMPONENTS Description Part No B On Off Auto Switch E0109200 NEUTRAL _ To G of Time Delay Relay 24 VAC E2077700 me aa Time Delay Relay 120 VAC E2077800 Grounding Conductor OPTIONAL EQUIPMENT 00 Description Part No Remote Aquastat 110 240F E0014400 Adjustable Immersion Well E0025900 Pump Time B Delay Relay Note The Remote Aquastat and the Immersion Well when To 1 of required should be ordered separately Adjusting Terminal Strip Knob nan To 4 of KY Terminal Strip lt ma Y To
58. ved vent cap The venting system should be installed according to the latest edition of ANSI Z223 1 and or in Canada CAN1 B149 requirement and any local codes having jurisdiction IMPORTANT NOTE Do not use sheet metal screws at the snap lock joints of Type B gas vents Do not weld or fasten the vent pipe to the heater draft hood The weight of the stack must not rest on the heater The draft hood and heater top must be easily removable for normal heater service and inspection Avoid using long horizontal runs of the vent pipe and too many 90 elbows reductions or restrictions Horizontal runs should have at least a 1 4 rise per foot in the direction of flow A vent connector should be supported for the design and weight of the material used to Mighty Therm Volume Water Heater Page 7 2C maintain clearances and prevent physical damage and separation of joints Avoid ending heater vents near air conditioning or air supply fans The fans can pick up exhaust flue products from the heater and return them inside the building creating a possible health hazard A minimum of 4 feet horizontal distance must be maintained from electrical meters gas meters and relief equipment Always use double wall or insulated vent pipe Type B or equivalent In cold weather uninsulated outside vents can chill the rising flue products blocking the natural draft action of the venting system This can create a health hazard by spill

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