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  4. 400A
  5. Installation Operation & Maintenance

Lochinvar 400A Installation Operation & Maintenance

Manual is about: COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER

Summary of 400A

  • Page 1

    1 models cg(n,l)120 thru 400a commercial gas, glass-lined, tank-type water heater • installation • operation • maintenance • limited warranty place these instructions adjacent to heater and notify owner to keep for future reference. Caution text printed or outlined in red contains information relati...

  • Page 2: Rough-In-Dimensions

    2 models cg(n,l)120 through cg(n,l)400 - table 1a model input approx. Gas h vent connections approximate rate tank inlet dia inlet outlet ship. Weight btu/hr. Cap. A b c d e f g i j top front back top front back std. Asme cg(n,l) 120,000 btu/hr. 71 gal 69.75” 4.25” 59.50” 50.87” 19.69” 19” 1/2” 51.8...

  • Page 3

    3 table 1c - heater performance data cg(n,l) models input approx. Recovery rating capacities (gph and lph) rate gal. Eff. 30°f 40°f 50°f 60°f 70°f 80°f 90°f 100°f 110°f 120°f 130°f 140°f model btuh cap. % (-)1° c 4° c 10° c 15° c 21° c 27° c 32° c 38° c 43° c 49° c 54° c 60° c cg(n,l) 120,000 btuh 7...

  • Page 4: Table of Contents

    4 table of contents rough-in-dimensions .................................................2-3 table of contents .........................................................4 foreword .........................................................................4 general safety information ......................

  • Page 5: General Safety

    5 general safety information precautions do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water. If the unit is exposed to the fo...

  • Page 6: Features

    6 • do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • do not allow insulation to come within 2” (5 cm) of the burners, to prevent blockage of combustion air flow to the burners. • do not allow insulation to come within 9” (23 cm) of floor,...

  • Page 7

    7 continued manual resetting of high limit control, preceded by higher than usual water temperature is evidence of high limit switch operation. The following is a possible reason for high limit switch operation: • a malfunction in the thermostatic controls would allow the gas valve to remain open ca...

  • Page 8: Installation Instructions

    8 never be placed on or adjacent to the heater. Open containers or flammable material should not be stored or used in the same room with the heater. The heater must not be located in an area where it will be subject to freezing. Locate it near a floor drain. The heater should be located in an area w...

  • Page 9

    9 the following units are approved for installation with side, rear and ceiling clearances as indicated below: a (right side) b (left side) c (back) d (ceiling) cg(n,l) 120070 1" (2.54 cm) 1" (2.54 cm) 1" (2.54 cm) 12" (30.48 cm) cg(n,l) 155080 1" (2.54 cm) 1" (2.54 cm) 1" (2.54 cm) 12" (30.48 cm) c...

  • Page 10

    10 confined space when drawing combustion and dilution air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings, one in or within 12 inches (30.5cm) of the enclosure top and one in or within 12 inches (30.5cm) of the enclos...

  • Page 11

    11 model cg(n,l)120070 input: 120,00btuh total vent height (feet) draft hood: 5” 6 8 10 15 20 30 50 100 input btuh rise vent connector diameter (inches) 120,000 1 ft. 7 7 7 6 6 6 6 6 120,000 2 ft. 6 6 6 6 6 6 6 5 123,000 3 ft. 6 6 6 6 6 5 5 5 number combined input of heaters in thousands of btuh man...

  • Page 12

    12 model cg(n,l)250100(a), 2500065(a) input: 250,000, 251,000 total vent height (feet) draft hood: 6” 6 8 10 15 20 30 50 100 input btuh rise vent connector diameter (in inches) 250/251,000 1 ft. - - - - - - 8 8 250/251,000 - - - 8 8 8 8 8 250/251,000 3 ft. - 8 8 8 - 8 7 7 number combined input of he...

  • Page 13

    13 if a water heater is installed in a closed water system, contact the water supplier or local plumbing inspector on how to control this situation. Water (potable) heating and space heating 1. All piping components connected to this unit for space heating applications shall be suitable for use with...

  • Page 14

    14 1 3 4 2 c p m x mv mv/pv pv 24 v gn d 24 v sp arker gnd-burne r honeywell ignition damper drive on/off switch lower probe upper probe/eco 11e79 line in 1 2 3 4 neutral natural gas valve pv pv th tr mv mv/pv mv propane gas valve 120 vac 24 va c to ignition contro l damper drive 24 va c 24 neutra l...

  • Page 15

    15 installation diagrams-top inlet/outlet usage general the type, size and location of the relief valves must be in accordance with local codes. The locations of the relief valves shown in the installation diagrams are typical. The heater has a factory installed high temperature limit switch and tem...

  • Page 16

    16 vertical storage tank and forced circulation danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 27. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water suppl...

  • Page 17

    17 danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 27. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water supplied to fixtures. Two temperature - one heater...

  • Page 18

    18 installation diagrams-side inlet/outlet usage danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 27. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water supp...

  • Page 19

    19 one or two temperature - one heaters,high temperature storage with or without recirculation heater with or without mixing valve heater with mixing valve and recirculated sanitizing loop note 1: toggle switch controls 180°f (82°c) water circulation. Install on or close to dishwashing machine. Togg...

  • Page 20

    20 two temperature - two pre-heaters with mixing valve or booster heater with or without building recirculation two pre-heaters with mixing valve two pre-heaters with booster heater danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning o...

  • Page 21

    21 medium temperature - one heater with auxiliary storage tank forced circulation with or without building recirculation vertical storage tank horizontal storage tank danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 27. If h...

  • Page 22: Mechanical Venting

    22 mechanical venting single unit installation when mechanical venting of these heaters is desired, the following kits are available. Models cg(n,l)120070 through cg(n,l)199100(a) part number 9006015 models cg(n,l)250100(a) through cg(n,l)400100(a) part number 9006016 where an approved power venter ...

  • Page 23: Operation

    23 operation important a qualified person must perform the initial firing of the heater. At this time the user should not hesitate to ask the individual any questions which they may have in regard to the operation and maintenance of the unit. An operational checklist is included at the rear of this ...

  • Page 24: For Natural Gas Models

    24 for natural gas models for your safety read before operating operating instructions for your safety read before operating.

  • Page 25: For Propane Gas Models

    25 for propane gas models for your safety read before operating operating instructions to turn off gas to appliance.

  • Page 26

    26 adjustments on initial startup some adjustments are necessary. 1. Check manifold and inlet gas pressures. 2. To adjust pilot flame - follow “pilot burner” procedure under “preventive maintenance”. Water temperature control warning this water heater is equipped with an adjustable thermostat to con...

  • Page 27: Preventive Maintenance

    27 2. Inspect the venting system for proper size and horizontal pitch, as required in the national fuel gas code, ansi z223.1 or the natural gas and propane installation code can/csa-b149.1 and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other defic...

  • Page 28

    28 typical pilot and main burner flames figure 16 if the preceding burner characteristics are not evident, check for accumulation of lint or other foreign material that restricts or other foreign material that restricts or blocks the air openings to the burner or heater. Note: cleaning of main burne...

  • Page 29

    29 venting system examine the venting system every six months for obstructions and/or deterioration of the vent piping. Remove all soot or other obstructions from chimney which will retard free draft. Remote storage tank temperature control the water temperature in the storage tank (if used) is cont...

  • Page 30

    30 caution observe handling instructions on label of product being used. Tank cleanout procedure the following practices will ensure longer life and enable the unit to operate at its designed efficiency: 1. Once a month the heater should be flushed. Open drain valve and allow two gallons of water to...

  • Page 31: Service

    31 service the installer may be able to observe and correct certain problems which may arise when the unit is put into operation. However, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater. As preliminary step, check wiring against d...

  • Page 32

    32 pin end view 24 v.A.C. Normal sequence of operation b. Damper has opened, no combustion voltage across: 4 & 1; 4 & 2; 4 & 3: 1. Check for power at ignition module terminals. If 24vac power is present damper is working properly. 2. Defective component in appliance after the flue damper. 3. If 24 v...

  • Page 33

    33 operational checklist this checklist in conjunction with “troubleshooting” and the “sequence of operation” should be used as an on-the-job troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper piping and wiring can resu...

  • Page 34

    34 limited warranty 1. The tank if the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable water therein, during the first three years after initial installation, the warrantor will supply a complete new lochinvar w...

  • Page 35: Notes

    35 notes.

  • Page 36

    36 copyright © 2011 lochinvar, llc, all rights reserved. 300 maddox simpson parkway lebanon, tn 37090 phone: 615-889-8900 • fax: 615-547-1000 technical service email: 2tech@lochinvar.Com www.Lochinvar.Com.