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Instruction Manual

PRINTED 1215 

324258-002

KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE 

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

 ULTRA LOW NOX COMMERCIAL GAS WATER HEATERS

• 

For Your Safety

 •

AN ODORANT IS ADDED TO THE GAS USED 

BY THIS WATER HEATER.

MODELS BL-80/BL-100

Series 100

INSTALLATION - OPERATION - SERVICE  

- MAINTENANCE - LIMITED WARRANTY

PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

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

Low Lead Content

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.

Summary of Contents for BL-80

Page 1: ...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 Low Lead Content WARNING If the information in t...

Page 2: ...gs for Confined Spaces 13 Outdoor Air Through Two Openings 13 Outdoor Air Through One Opening 13 Outdoor Air Through Two Horizontal Ducts 14 Outdoor Air Through Two Vertical Ducts 14 Air From Other In...

Page 3: ...hazard what can happen if you do not follow the safety message and how to avoid the risk of injury DANGER WARNING CAUTION CAUTION DANGER indicates an imminently hazardous situation which if not avoide...

Page 4: ...4 GENERAL SAFETY INFORMATION...

Page 5: ...you don t follow the safety rules the water heater will not operate properly It could cause DEATH SERIOUS BODILY INJURY AND OR PROPERTY DAMAGE This manual contains instructions for the installation op...

Page 6: ...2 1 1 2 12 1 2 CM 157 6 147 3 74 9 64 1 40 3 10 2 38 7 40 6 5 1 NPT NPT 31 8 Model INPUT RATE F 30 40 50 60 70 80 90 100 110 120 130 140 GPH 246 184 147 123 105 92 82 74 67 61 57 53 C 17 22 28 33 39 4...

Page 7: ...vicing and proper operation of the water heater Installation of water heater must be accomplished in such a manner that if the tank or any connections should leak flow will not cause damage to the str...

Page 8: ...per and inefficient operation of the water heater producing carbon monoxide gas in excess of the safe limits This could result in serious injury or death Contact your local gas supplier for any specif...

Page 9: ...rtain it does not sag thereby obstructing the combustion air flow HARD WATER Where hard water conditions exist water softening or the threshold type of water treatment is recommended This will protect...

Page 10: ...manufacturer s specifications If a positive lock up regulator is required follow these instructions 1 Positive lock up gas pressure regulators must be rated at or above the input Btu hr rating of the...

Page 11: ...s not intended for the constant relief of thermal expansion A properly sized thermal expansion tank must be installed on all closed systems to control the harmful effects of thermal expansion Contact...

Page 12: ...ature Pressure Relief Valve discharge line and 2 the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot If after manually operating th...

Page 13: ...eater and the risk of fire or explosion may result It can also create a risk of asphyxiation LOUVERS AND GRILLES Thefreeareasofthefreshairopeningsintheinstructionsthatfollowdonot takeintoaccountthepre...

Page 14: ...e provided with two permanent vertical ducts one commencing within 12 inches 300 mm of the top and one commencing within 12 inches 300 mm of the bottom of the enclosure The vertical ducts shall commun...

Page 15: ...er heater unless it is vented to the outdoors and has adequate air supply to avoid risks of improper operation explosion or asphyxiation Align the legs of the draft hood with the holes provided Insert...

Page 16: ...IN INCHES MAXIMUM CAPACITY OF PIPE IN CUBIC FEET PER HOUR LENGTH IN FEET NOMINAL IRON PIPE SIZES INCHES INPUT IN THOUSANDS BTU HR 1 2 3 4 1 1 1 4 1 1 2 2 2 1 2 3 4 10 175 360 680 1400 2100 3960 6300 1...

Page 17: ...allation shown in the Figures 15 and 16 Contaminants in the gas lines may cause improper operation of the gas control valve that may result in fire or explosion Before attaching the gas line be sure t...

Page 18: ...ter several tries turn the gas control knob clockwise to OFF and call your service technician or gas supplier SEE FIGURE A DANGER Hotter water increases the risk of scald injury Consult the instructio...

Page 19: ...r at the water heater Mixing valves are available at plumbing supply or hardware stores see Figure 6 Follow manufacturer s instructions for installation of the valves Before changing the factory setti...

Page 20: ...See Condensation in this section OPERATIONAL CONDITIONS SMELLY WATER In each water heater there is installed at least one anode rod for corrosion protection of the tank Certain water conditions will c...

Page 21: ...replaced At least once a year a visual inspection should be made of the main burner and pilot burner see Figure 19 Inspect burner fl ames through viewport Flames should be very small with a blue haze...

Page 22: ...ter temperature and usage see chart The higher the water temperature or water usage the more lime deposits are dropped out of the water This is the lime scale which forms in pipes heaters and on cooki...

Page 23: ...drained before opening cleanout To clean heater through cleanout opening proceed as follows 1 Drain heater 2 Remove outer cover plate from lower side of heater jacket 3 Remove six 6 hex head screws se...

Page 24: ...er is no longer hot 4 Close the cold water inlet valve to the water heater 5 Connect a hose to the water heater drain valve and terminate it to an adequate drain 6 Open the water heater drain valve an...

Page 25: ...an condense on the cooler surfaces of the tank Droplets form and drip onto the burner or run on the floor This is common at the time of start up after installation and when incoming water is cold I Wa...

Page 26: ...Gas Control Replace Gas Control PILOT OUTAGE Dirty pilot burner Clean pilot assembly Thermocouple malfunction Replace pilot assembly and or thermocouple Defective Gas Control Replace Gas Control Ther...

Page 27: ...ocal codes shall govern their usage 4 The Tank Temperature Control should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat s...

Page 28: ...trol should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the Tank Temperature Cont...

Page 29: ...Control should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the Tank Temperature C...

Page 30: ...ired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control SINGLE FLUE...

Page 31: ...rature Control should be wired to and control the pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the Tank Temper...

Page 32: ...he pump between the water heater s and the storage tank s 5 The water heater s operating thermostat should be set 5 degrees F higher than the Tank Temperature Control SINGLE FLUE 2 UNITS TWO TEMPERATU...

Page 33: ...33 NOTES...

Page 34: ...34 NOTES...

Page 35: ...gas type venting connections combustion air voltage wiring or fusing Failure to follow applicable codes Failure to follow printed instructions Improper installation sizing delivery or maintenance Cla...

Page 36: ...36 500 Tennessee Waltz Pkwy Ashland City TN 37015 Technical Support 800 527 1953 Parts 800 433 2545 www hotwater com Copyright 2014 A O Smith Corporation All rights reserved...

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