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CommerCial gas water heaters

instruction manual

PRINTED 0613 

318815-003

plaCe these instruCtions adjaCent to heater and notify owner to keep for future referenCe.

Thank you for buying this energy efficient water heater. 

We appreciate your confidence in our products.

models Btn 120 - 400(a)

low nox series 108

installation - operation - serViCe  

- maintenanCe - limited warranty

WARNING:  If   the information   in   these

instructions is not followed exactly, a fire

or explosion may result causing property

damage, personal injury or death.

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  neighbor’s  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 the gas supplier.


Read and understand this instruction

manual and the safety messages

herein before installing, operating or

servicing this water heater.
Failure to follow these instructions and

safety messages could result in death

or serious injury.
This manual must remain with the

water heater.

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Summary of Contents for Master-Fit BTN-200

Page 1: ...iquids 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 neighbor s 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 qu...

Page 2: ...33 Operational Conditions 33 Troubleshooting 34 Water Piping Diagrams 35 Manifold Kits 50 Warranty 51 Table Of Contents Safe Installation Use and Service 3 General Safety Information 4 Precautions 5 Grounding Instructions 5 Hydrogen Gas Flammable 5 Introduction 6 Abbreviations Used 6 Qualifications 6 Preparing For The Installation 6 FEATURES AND COMPONENTS 7 The Eliminator self cleaning system 7 H...

Page 3: ...fects or other reproductive harm and requires businesses to warn of potential exposure to such substances Warning This product contains a chemical known to the State of California to cause cancer birth defects or other reproductive harm This appliance can cause low level exposure to some of the substances listed in the Act DANGER WARNING CAUTION CAUTION DANGER indicates an imminently hazardous sit...

Page 4: ...lation Contact a qualified installer or service agency for installation and service Excessive gas pressure to gas valve can cause serious injury or death Do not use water heater with any gas other than the gas shown on the rating label Turn off power to the water heater before performing any service Electrical Shock Hazard Label all wires prior to disconnecting when performing service Wiring error...

Page 5: ... water system If hydrogen is present there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow There should be no smoking or open flame near the faucet at the time it is open General Safety Information Verify the power to the water heater is turned off before performing any service procedures Read and understand this instruction manual and the safety...

Page 6: ...piping and wiring be installed as shown Particular attention should be given to the installation of thermometers at the locations indicated in the piping diagrams as these are necessary for checking the operation of the water heater The principal components of the water heater are identified in Features And Components on page in this manual Use this reference to locate and identify various compone...

Page 7: ...ch 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 causing water temperature to exceed the thermostat setting The water temperature would continue to rise until high limit switch operation Contact your dealer or qualified service agency if continued high limit switch operation occurs DI...

Page 8: ...g F Deg C 36 20 40 22 50 28 54 30 60 33 70 39 72 40 80 44 90 50 100 56 108 60 110 61 120 67 126 70 130 72 140 78 BTN 120 120000 71 80 GPH 321 289 231 214 192 165 160 144 128 115 107 105 96 92 89 82 35 269 LPH 1214 1093 874 810 729 625 607 546 486 437 405 397 364 347 336 312 BTN 154 154000 81 80 GPH 412 371 296 274 247 212 206 185 165 148 137 135 124 118 114 106 45 307 LPH 1559 1403 1122 1039 935 8...

Page 9: ...0 mm 0 0 mm 12 305 mm BTN 310 A 3 76 mm 3 76 mm 3 76 mm 12 305 mm BTN 366 A 0 0 mm 0 0 mm 0 0 mm 12 305 mm BTN 400 A 0 0 mm 0 0 mm 0 0 mm 12 305 mm Locating the Water Heater Property Damage Hazard All water heaters eventually leak Do not install without adequate drainage CAUTION When installing the heater consideration must be given to proper location Location selected should be as close to the st...

Page 10: ...p it on the side of the water heater or nearby for future reference DO obtain new warning and instruction labels from the manufacturer for placement on the blanket directly over the existing labels DO inspect the insulation blanket frequently to make certain it does not sag thereby obstructing combustion air flow HARD WATER Where hard water conditions exist water softening or the threshold type of...

Page 11: ...g Therefore to calculate the input rating at 4 000 feet 1219m 4 x 04 x 78 000 12 480 Btuh 3 7 Kwh 78 000 22 9 Kwh 12 480 3 7 Kwh 65 520 Btuh 19 2 Kwh At 6000 feet 1829m the correct input rating should be 59 280 Btuh 17 4 Kwh Some circulating pumps are manufactured with sealed bearings and do not require further lubrication Some circulating pumps must be periodically oiled Refer to the pump manufac...

Page 12: ...plypressure must be stable within 1 5 W C 0 37 kPa from static to dynamic pressure to provide good performance Pressure drops that exceed 1 5 W C 0 37 kPa may cause rough starting noisy combustion or nuisance outages Increases or spikes in static pressure during off cycles may cause failure to ignite or in severe cases damage to water heater gas valves If your low pressure system does NOT meet the...

Page 13: ...and the Water Piping Diagrams beginning on page 35 Temperature Pressure Relief Valve Explosion Hazard Temperature Pressure Relief Valve must comply with ANSI Z21 22 CSA 4 4 and ASME code Properly sized temperature pressure relief valve must be installed in opening provided Can result in overheating and excessive tank pressure Can cause serious injury or death This water heater is provided with a p...

Page 14: ...nd Thermal Expansion on page 13 If you do not understand these instructions or have any questions regarding the Temperature Pressure Relief Valve call the toll free number listed on the back cover of this manual for technical assistance Contaminated Air Breathing Hazard Carbon Monoxide Gas Install water heater in accordance with the Instruction Manual and NFPA 54 or CAN CSA B149 1 To avoid injury ...

Page 15: ...Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors are considered a part of the unconfined space Makeup air requirements for the operation of exhaust fans kitchen ventilation systems clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to provide combustion ventilation and dilution air...

Page 16: ...ing Figure 15 Alternatively a single permanent opening commencing within 12 inches 300 mm of the top of the enclosure shall be provided See Figure 14 The water heater shall have clearances of at least 1 inch 25 mm from the sides and back and 6 inches 150 mm from the front The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outd...

Page 17: ...e aggregate input rating of all appliances installed in the enclosure Each opening shall not be less than 100 square inches 645 cm2 Outdoor Air Through Two Vertical Ducts The illustrations shown in this section of the manual are a reference for the openings that provide fresh air into confined spaces only Do not refer to these illustrations for the purpose of vent installation See Venting Installa...

Page 18: ...6 inches 6 8 10 15 20 30 50 100 Input Btu hr Rise Vent Connector Diameter Inches 154 000 1 Ft 6 6 6 6 6 6 6 6 154 000 2 Ft 6 6 6 6 6 6 6 6 154 000 3 Ft 6 6 6 6 6 6 6 6 Number of 154 Heaters Combined Input btu hr Manifold and Common Vent Diameter Inches 2 308 000 8 8 7 7 7 6 6 6 3 462 000 9 9 9 8 8 7 7 7 4 616 000 12 10 10 9 9 8 8 7 MODEL BTN 180 199 199C 200 Input 180 000 and 199 000 Btu hr Total ...

Page 19: ...9 MODEL BTN 310 Input 310 000 Btu hr T otal Vent Height Feet Vent Connector Size 6 inches 6 8 10 15 20 30 50 100 Input Btu hr Rise Vent Connector Diameter Inches 310 000 1 Ft 8 8 8 7 7 6 6 310 000 2 Ft 8 8 8 7 7 7 6 6 310 000 3 Ft 8 8 8 7 7 7 6 6 Number of 310 Heaters Combined Input btu hr Manifold Common Vent Diameter 2 620 000 12 10 10 9 9 8 8 7 3 930 000 14 14 12 12 10 10 9 9 4 1 240 000 16 14 ...

Page 20: ...fore installation of the water piping begins 1 Water Temperature Control and Mixing Valves on page 12 2 Dishwashing Machines on page 13 3 Closed Systems and Thermal Expansion on page 13 4 Temperature Pressure Relief Valve on page 13 14 5 For multiple water heater installations see Water Piping Diagrams beginning on page 35 Water Potable Heating and Space Heating 1 All piping components connected t...

Page 21: ...ying heat to this fitting Do not allow pipe dope to contact the plastic tube during installation Tube Inlet Installation Figure 19 TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES SEE WATER TEMPERATURE CONTROL AND MIXING VALVES ON PAGE 12 IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT ADD AN ANTI SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES ...

Page 22: ...ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION If any of the original wire as supplied with the water heater must be replaced use only type 105 C thermoplastic or equivalent 2500 C type F must be used for the flame sensor and igniter leads The controls of this water heater are polarity sensitive Be certain to properly wire the hot and neutral connections...

Page 23: ...fore attaching the gas line be sure that all gas pipe is clean on the inside To trap any dirt or foreign material in the gas supply line a sediment trap must be incorporated in the piping see Figure 21 The sediment trap must be readily accessible and not subject to freezing conditions Install in accordance with recommendations of serving gas suppliers Refer to the latest version of the National Fu...

Page 24: ...e Gas Line Leak Testing on page 23 and repair any leaks found Start Up Initial Start Up Required Test Equipment U tube manometer pressure gauge or digital manometer Recommended range 20 W C 5 kPa Note All test equipment must be acclimated to ambient temperature before calibration and use Preparation 1 Adjust the thermostat to the lowest temperature setting 2 Turn the water heater s on off switch t...

Page 25: ...l Onmultiplewaterheaterinstallationsthesupplygaslineregulators shall be adjusted to provide gas pressure to each water heater within the minimum and maximum supply pressure requirements listed in Table 3 on page 8 with all gas fired appliances connected to a common gas main firing at full capacity Note A pressure drop of more than 1 5 W C 0 37 kPa when the Main Burner ignites is an indication of a...

Page 26: ... power to the Silicon Nitride Igniter 11 From the time the Silicon Nitride Igniter s power is shut off the Ignition Control Board waits 3 more seconds to monitor the Flame Sensor 12 If the Flame Sensor does not detect a strong enough flame the Ignition Control Board shuts off the Gas Valve and allows the Exhaust Inducer to purge the unit for 20 seconds At that time the Ignition Control Board resta...

Page 27: ...27 Sequence of Operation Flow Chart Description of this flow chart can be found in the SEQUENCE OF OPERATION section found on page 26 FIGURE 24 ...

Page 28: ...e heater where the thermostat senses the drop in water temperature and activates main burner operation of the water heater If the storage tank temperature control is out of calibration replace with new control SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF TURN OFF THE MANUALGAS CONTROLVALVE TO THE WATER HEATER Temperature Pressure Relief Valve Test Burn hazard Hot water discharge Kee...

Page 29: ...ts described below To Drain the Water Heater Storage Tank 1 Turn off the electrical supply to the water heater 2 Turn off the gas supply at the Main Gas Shutoff Valve if the water heater is going to be shut down for an extended period 3 Ensure the cold water inlet valve is open 4 Open a nearby hot water faucet and let the water run until the water is no longer hot 5 Close the cold water inlet valv...

Page 30: ...om faucet when turning on hot water Do not smoke or have open flame or sparks in vicinity of heater Do not mix UN LIME with other chemicals Do not allow contact with magnesium aluminum or galvanized metals Lime accumulation not only reduces the life of equipment but also reduces efficiency of the heater and increases fuel consumption The usage of water softening equipment greatly reduces the hardn...

Page 31: ... flush with cool water If irritation persists get medical attention If swallowed give 1 or 2 glasses of water or milk and call physician Get immediate medical attention for eyes Keep out of reach of children NOTE THE USE OF RUBBER OR NEOPRENE GLOVES IS RECOMMENDED ESPECIALLY IF YOU HAVE ANY OPEN SORES ORCUTSTOAVOIDUNNECESSARYIRRITATIONORDISCOMFORT 1 Turn off fuel and or power supply to heater Also...

Page 32: ...o service the heater As preliminary step check wiring against diagram check for grounded broken or loose wires Check all wire ends to be sure that they are making good contact Checklist Before calling your service agent the following checklist should be examined to eliminate obvious problems from those requiring replacement or servicing Check that main manual gas shutoff valve is fully open and th...

Page 33: ...h operation the water heater cannot be restarted unless the water temperature is reduced to approximately 120 F 49 C The high limit reset button on the front of the thermostat then needs to be depressed See Figure 2 for the location of the reset button Start Up Conditions SMOKE ODOR It is not uncommon to experience a small amount of smoke and odor during the initial start up This is due to burning...

Page 34: ...nsation on outside of tank normal Rumbling Sediment accumulation on bottom of tank Drain a quantity of water through drain valve If rumbling persists call a qualified service agency Delime heater Ticking or metallic sounds Expansion and contraction normal Pounding or water hammer Air chambers in piping have become waterlogged Thermal expansion tank damaged improperly charged or improperly sized Dr...

Page 35: ... s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control MULTI FLUE 1 UNIT WITH VERTICAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WIT...

Page 36: ...at should be set 5 degrees F higher than the Tank Temperature Control MULTI FLUE 1 UNIT WITH HORIZONTAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND O...

Page 37: ...s and the storage tank s MULTI FLUE 1 UNIT WITH MIXING VALVE TWO TEMPERATURE LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS TE...

Page 38: ...ween the water heater s and the storage tank s MULTI FLUE 2 UNITS LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS HOT WATER TO ...

Page 39: ...stat should be set 5 degrees F higher than the Tank Temperature Control MULTI FLUE 2 UNITS WITH VERTICAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ...

Page 40: ...stat should be set 5 degrees F higher than the Tank Temperature Control MULTI FLUE 2 UNITS WITH VERTICAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ...

Page 41: ...at should be set 5 degrees F higher than the Tank Temperature Control MULTI FLUE 2 UNITS WITH HORIZONTAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ...

Page 42: ...TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS BOOSTER WATER RETURN PRE HEATED WATER TO BOOSTER BOOSTER WATER TO FIXTURES HOT WATER T...

Page 43: ...F VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS EXPANSION TANK BOOSTED WATER OUTLET TYPICAL BOOSTER HEATER PRE HEATER PRE HEATER MUST BE IDENTICAL HEATERS FINISHED FLOOR COLD WATER S...

Page 44: ...MPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS HOT WATER TO FIXTURES HOT WATER RETURN COLD WATER SUPPLY EXPANSION TANK PIPE T P TO OPEN...

Page 45: ... than the Tank Temperature Control MULTI FLUE 3 UNITS WITH VERTICAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENT...

Page 46: ...er than the Tank Temperature Control MULTI FLUE 3 UNITS WITH HORIZONTAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIRE...

Page 47: ...ELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS EXPANSION TANK COLD WATER SUPPLY HOT WATER TO FIXTURES FINISHED FLOOR HOT WATER RETURN PIPE T P TO OPEN DRAI...

Page 48: ...Temperature Control MULTI FLUE 4 UNITS WITH VERTICAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS HOT WATER TO ...

Page 49: ...k Temperature Control MULTI FLUE 4 UNITS WITH HORIZONTAL STORAGE TANK LEGEND TEMPERATURE PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE CIRCULATING PUMP TANK TEMPERATURE CONTROL DRAIN FULL PORT BALL VALVE TEMPERATURE GAGE WATER FLOW SWITCH CHECK VALVE WARNING THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND OTHER DEVICES CHECK WITH LOCAL CODES AND ORDINANCES FOR ADDITIONAL REQUIREMENTS HOT WATER...

Page 50: ...PART NO 9003426205 THREE UNIT MANIFOLD KIT PART NO 9003427205 FOUR UNIT MANIFOLD KIT PART NO 9003428205 MODEL DIMENSION A BTN 120 63 BTN 154 68 BTN 180 72 BTN 199C 72 BTN 199 72 BTN 200 A 72 BTN 250 A 72 BTN 275 A 72 BTN 310 A 73 BTN 366 A 73 BTN 400 A 73 ...

Page 51: ...Warranty 51 ...

Page 52: ...Copyright 2013 A O Smith Water Heater Company All rights reserved www hotwater com 500 Tennessee Waltz Parkway Ashland City TN 37015 Tech Support 800 527 1953 Parts 800 433 2545 ...

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