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  5. Installation, Operation And Maintenance Manual

Laars Mighty Max VW Installation, Operation And Maintenance Manual

Manual is about: Volume Water Heaters Sizes 320M - 400M

Summary of Mighty Max VW

  • Page 1

    Installation, operation and maintenance instructions document 2064d h0192500d installation, operation and maintenance instructions for mighty max volume water heaters model vw sizes 320m - 400m u.S. Reg. 1,901,192 canada reg. 433,882 warning if the information in this manual is not followed exactly,...

  • Page 2

    Page 2 laars heating systems table of contents section 1. General information 1.1 introduction ................................................... 3 1.2 warranty ....................................................... 3 1.3 technical assistance .................................... 3 section 2. Insta...

  • Page 3

    Mighty max volume water heater page 3 section 1. General information 1.1 introduction this manual provides installation, operation, and maintenance instructions for the mighty max volume water heater, model vw, sizes 320m and 400m. Review all application and installation procedures completely before...

  • Page 4

    Page 4 laars heating systems automatically fired heaters, csd-1. In canada, other standards may apply. Any changes to the heater, its gas controls, gas orifices, or wiring may void the warranty. If field conditions require change, consult the factory. The mighty max vw heater is designed- certified ...

  • Page 5

    Mighty max volume water heater page 5 figure 3. Heater gas valve arrangement. Notes: 1. These numbers are based on 1/2 inch (13mm) water column pressure drop. 2. Check supply pressure and local code requirements before proceeding with work. 3. Pipe fittings must be considered when determining gas pi...

  • Page 6

    Page 6 laars heating systems 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 undersize gas meter and/or obstructed gas supply line. 8. Do n...

  • Page 7

    Mighty max volume water heater page 7 local factory representative or laars factory for additional information. 2.7.3 pressure buildup in water system the water utility supply meter may contain a check valve, back flow preventer, or water pressure reducing valve. This will create a closed water supp...

  • Page 8

    Page 8 laars heating systems figure 6. Installation of tempering valve. Mixing valve out - mixed water for potable use hot water from water heater or storage tank cold water supply this is essentially correct for normal water. If a higher temperature rise is measured, flow must be increased by chang...

  • Page 9

    Mighty max volume water heater page 9 2.8 venting and combustion air information provisions for venting and supply of air for venting and combustion must be done in accordance with these instructions and applicable requirements of the latest edition of ansi z223.1/nfpa 54. In canada, installation mu...

  • Page 10

    Page 10 laars heating systems the following requirements must be used for non-category i venting: 1. Laars specified vent pipe material (table 6) and sizes (table 7). 2. Pipe insulation and sealing tape. 3. Routing vent pipe through spaces which, except for the terminal, remain above 60°f (16°c) dur...

  • Page 11

    Mighty max volume water heater page 11 category i vertical venting (category i) combustion air in through louvers vertical venting with ducted combustion air horizontal venting any vent which does not meet category i combustion air through louvers horizontal venting ducted combustion air (certified ...

  • Page 12

    Page 12 laars heating systems figure 8. Top-to-rear vent collar. Adapter plate top panel vent collar/stack blank plate (heater jacket) blank plate on flue collector blank plate on heater jacket top panel 1. Removal of blank plate and adapter plate from heater 3. Blank plate placement over stack top ...

  • Page 13

    Mighty max volume water heater page 13 it is for this reason that, in addition to following proper vent sizing, construction and safety requirements from the national fuel gas code, ansi z223.1 or in canada, from csa b149.1 as well as all applicable local codes, it is required that installers provid...

  • Page 14

    Page 14 laars heating systems and do not permit any other condition, such as an exhaust blower, to affect the air supply for combustion and ventilation. 2.11.2 ducted combustion air combustion air can be brought directly to the heater through a duct of suitable size and length (see table 7). Consult...

  • Page 15

    Mighty max volume water heater page 15 term description pipe single-wall galvanized steel pipe, 24 gauge minimum. Joint sealing permanent duct tape or aluminum tape insulation not required, but recommend r5 insulation for cold installations (consult american society of heating, refrigerating, and ai...

  • Page 16

    Page 16 laars heating systems figure 11. Wiring diagram. Connection diagram light bk com no 24v com bl r fusible link fa n 115v 24v 115v/60 hz power suppl y w fuse 2amp ind s1 l1 fs/s2 mv1 p.Sw th y field interlock p pre.P lo bl r (remove jumper when used) grounding junction gas val ve igniter trans...

  • Page 17

    Mighty max volume water heater page 17 section 3. Operation warning to avoid property damage, injury or loss of life, do not use this appliance if any part has been under water. Immediately call a qualified service technician to replace the appliance. Avertissement n’utilisez pas cet appareil s’il a...

  • Page 18

    Page 18 laars heating systems 4. Séquence normale d’opération. Quand la pompe de circulation est en marche, la chaudière se mettra automatiquement en marche ou s’arrêtera en fonction de la température de l’eau. Quand l’eau refroidit au-dessous de la température réglée, il se produira la séquence sui...

  • Page 19

    Mighty max volume water heater page 19 6. Wait five (5) minutes to clear out any gas, then smell for gas, including near the floor. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. Caution this appliance is equipped with an ignition device which a...

  • Page 20

    Page 20 laars heating systems figure 14. Unfired venturi differential pressure - natural gas. 5.8" wc gas plenum tap gas orifice tap venturi inlet tap figure 15. Gas offset pressure - natural gas. 0.4" wc figure 16. Gas orifice differential pressure - natural gas. 4.0" wc a. Unfired venturi differen...

  • Page 21

    Mighty max volume water heater page 21 by setting the gas offset pressure and gas orifice differential pressure according to table 10, the correct input rate and gas to air ratio is achieved. 3.6.3 venturi setup procedure - natural gas 1. Loosen the nut on the blower shutter to allow for adjustment....

  • Page 22

    Page 22 laars heating systems 4. Now that the heater is firing, use the blower damper to readjust the venturi inlet pressure according to the installation’s altitude in table 11 (+1.6"w.C. At sea level). Elevation venturi inlet gas throat ft. Pressure pressure differential (blue tap) offset pressure...

  • Page 23

    Mighty max volume water heater page 23 4.2.1 inspection of the heat exchanger warning improper installation or maintenance can cause nausea or asphyxiation from carbon monoxide in flue gases which could result in severe injury, property damage, or death. Avertissement une installation ou un entretie...

  • Page 24

    Page 24 laars heating systems note: while the heat exchanger is out of the heater, inspect the firewall refractory insulation blocks for cracks, wear and breakage. Replace if necessary. 4.2.1d cleaning the heat exchanger - internal 1. Remove the inlet/outlet header of the heat exchanger. 2. Remove t...

  • Page 25

    Mighty max volume water heater page 25 figure 19. Troubleshooting chart. Out of production.

  • Page 26

    Page 26 laars heating systems long as the ignition control igniter senses a stable flame. 5. After the call for heat is satisfied the ignition control closes the gas valves and operate the blower for a thirty (30) second post purge cycle. This clears the combustion chamber of combustion products. Th...

  • Page 27

    Mighty max volume water heater page 27 5.3.2 electrical troubleshooting troubleshooting procedures should only be performed by professional service technicians qualified in heater maintenance. Some electrical components are wired in parallel, so it is necessary to troubleshoot in the order that they...

  • Page 28

    Page 28 laars heating systems item description part number 8. Sight glass .................................................... F0044800 9. Igniter, hot surface ....................................... W0038001 10. Gasket, igniter hot surface ........................... 20409800 11. Control, remote ig...

  • Page 29

    Mighty max volume water heater page 29 front view right side view out of production.

  • Page 30

    Page 30 laars heating systems front view rear view right side view left side view out of production.

  • Page 31

    Mighty max volume water heater page 31 out of production.

  • Page 32

    H0192500d a subsidiary of bradford white corporation 20 industrial way, rochester, nh 03867 • 603.335.6300 • fax 603.335.3355 1355 kuehner drive, simi valley, ca 93063 • 800.900.9276 • fax 800.559.1583 (sales, service) 480 s. Service rd. West, oakville, ontario, canada l6k 2h4 • 905.844.8233 • fax 9...