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- A.O. Smith
- Water Heater
- BTX 100
- Instruction Manual
A.O. Smith BTX 100 Instruction Manual
1
Instruction Manual
PRINTED 0412
322293-001
Keep thIs Manual In the pocKet on heater for future reference
whenever MaIntenance adjustMent or servIce Is requIred.
power vent/power dIrect vent Gas Models
wIth hot surface IGnItIon
Models BtX 100 serIes 124/125
all technIcal and warrantY questIons: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, CALL THE TECHNICAL SUPPORT PHONE NUMBER SHOWN ON THE WATER HEATER LABELING.
coMMercIal Gas water heaters
•
for Your safety
•
AN ODORANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
Ashland City, TN 37015
www.hotwater.com
Thank you for buying this energy efficient water heater.
We appreciate your confidence in our products.
Summary of BTX 100
Page 1
1 instruction manual printed 0412 322293-001 keep this manual in the pocket on heater for future reference whenever maintenance adjustment or service is required. Power vent/power direct vent gas models with hot surface ignition models btx 100 series 124/125 all technical and warranty questions: sho...
Page 2
2 table of contents safe installation, use and service.................................3 approvals .................................................................................3 general safety information .............................................4 precautions ...................................
Page 3
3 the proper installation, use and servicing of this water heater is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you and others of a potential injury hazard. Read and...
Page 4: Caution
4 precautions do not use this appliance if any part has been under water. Immediately call a qualified service agency to inspect the appliance and to make a determination on what steps should be taken next. If the unit is exposed to the following, do not operate heater until all corrective steps hav...
Page 5
5 general safety information.
Page 6: Caution
6 fire hazard do not install water heater on carpeted floor. Do not operate water heater if flood damaged. For continued protection against risk of fire: fire or explosion hazard read instruction manual before installing, using or servicing water heater. Avoid all ignition sources if you smell gas. ...
Page 7
7 thank you for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service. Abbreviations used abbreviations found in this instruction manual include : • ansi - american national standards institute • asme - american society of mechanical engine...
Page 8
8 * caution harness has 120 vac. In operation. ** see “planning the vent system,” “installation of vent system” and “condensate piping” for more information. Figure 1. Vacuum relief valve *install per local codes m display enclosure ** n exhaust elbow assembly ** o condensate tubing p off/on switch ...
Page 9
9 table 1 – rough-in-dimensions units a b c d e f g h i inches 66.75 49.25 22.00 15.75 3.00 8.00 8.00 62.00 65.00 cm 169.5 125.09 55.88 40.00 7.62 20.32 20.32 157.48 165.1 top/side inlet and outlet: 3/4” npt gas inlet: 1/2” npt table 2 – capacity, gas and electrical characteristics approximate capac...
Page 10: Caution
10 locating the water heater carefully choose a location for the new water heater. The placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the appliance. Property damage hazard all water heaters eventually leak. • do not inst...
Page 11
11 installed in an alcove or closet, the entire floor must be covered by the panel. Failure to heed this warning may result in a fire hazard. Minimum clearances between the water heater and combustible construction are 0 inch at the sides and rear, 5.5” (14.0 cm) from the front and 18” (45.7 cm) fro...
Page 12
12 ventilation systems, clothes dryers and fireplaces shall also be considered in determining the adequacy of a space to provide combustion, ventilation and dilution air. Unusually tight construction in unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, venti...
Page 13
13 1. 1 square inch per 3000 btu/hr (733 mm 2 per kw) of the total input rating of all appliances located in the enclosure, and 2. Not less than the sum of the areas of all vent connectors in the space. Outdoor air through two horizontal ducts figure 6. The confined space shall be provided with two ...
Page 14
14 this water heater shall not be connected to any heating systems or component(s) used with a non-potable water heating appliance. All piping components connected to this unit for space heating applications shall be suitable for use with potable water. Toxic chemicals, such as those used for boiler...
Page 15
15 mixing valves water temperature over 125°f (52°c) can cause severe burns instantly resulting in severe injury or death. Children, the elderly and the physically or mentally disabled are at highest risk for scald injury. Feel water before bathing or showering. Temperature limiting devices such as ...
Page 16
16 • the hot water line from the water heater should be vertical past any mixing valve or supply line to the heating system to remove air bubbles from the system. • do not connect the water heater to any system or components previously used with non-potable water heating appliances when used to supp...
Page 17: Caution
17 fit pipe insulation over the incoming cold water line and the hot water line. Make sure that the insulation is against the top cover of the heater.Fit t & p valve insulation over valve. Make sure that the insulation does not interfere with the lever of the t & p valve. Secure all insulation using...
Page 18
18 gas piping make sure gas supplied is same type listed on model rating plate. The inlet gas pressure must not exceed 14 inch water column (3.5 kpa) for natural and propane gas (l.P.). The minimum inlet gas pressure shown on rating plate is that which will permit firing at rated input. Sediment tra...
Page 19
19 54) or the natural gas and propane installation code (can/csa b149.1) whichever applies. Copper or brass tubing and fittings (except tin lined copper tubing) shall not be used. If the gas control valve is subjected to pressures exceeding 1/2 psi (3.5 kpa), the damage to the gas control valve coul...
Page 20
20 filling the water heater never use this water heater unless it is completely full of water. To prevent damage to the tank, the tank must be filled with water. Water must flow from the hot water faucet before turning “on” gas to the water heater. To fill the water heater with water: 1. Close the w...
Page 21
21 u.S. Installations: note: this unit can be vented with pvc pipe materials (dwv astm-d2665 or csa b181.2; schedule 40, 80, 120 astm-d1785 or csa b137.3; or sdr series astm-d2241 or csa b137.3), cpvc pipe materials (cpvc41 astm-d2846 or csa b137.6; schedule 40, 80 astm-f441 or csa b137.6; or sdr se...
Page 22
22 commonwealth of massachusetts for all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the co...
Page 23
23 termination clearances sidewall power vent v x vent terminal air supply inlet area where terminal is not permitted v v a g v fixed closed fixed closed operable operable v c b b b b f b v v a j v h m x x v v k b e d l power vent (using room air for combustion) exterior clearances for sidewall vent...
Page 24
24 termination clearances sidewall direct vent v x vent terminal air supply inlet area where terminal is not permitted v v a g v fixed closed fixed closed operable operable v c b b b b f b v v a j v h m x x v v k b e d l direct vent (using outdoor air for combustion) exterior clearances for sidewall...
Page 25
25 sequence of installations, figures 15 – 16b cut a length of pvc pipe about 3.5 inches (8.9 cm) longer than the wall thickness at the opening. Glue the vent terminal to this section of pipe. Slide the wall plate over the pipe to stop against the vent terminal. Place a bead of caulking (not supplie...
Page 26
26 vertical vent terminal installation when terminating through a roof, the following specifications pertaining to terminal location must be followed. 1. Proper support must be provided for all pipe protruding through the roof. 2. The vertical roof terminations should be sealed with a plumbing roof ...
Page 27
27 concentric vent installation this appliance is certified for concentric venting with concentric vent kit #9003910105 and #9006328005. Follow instructions below for proper installations. Table 6 – kit components each kit is comprised of the following: item description qty. Rain cap 3 in. 1 sdr-26 ...
Page 28
28 5. Secure assembly to roof structure as shown in figure 24 using field supplied metal strapping or equivalent support material. Note: ensure termination height is above the roof surface or anticipated snow level as shown in figure 24. 6. Install rain cap and small diameter pipe assembly in roof p...
Page 29
29 5. Install rain cap and small diameter pipe assembly in y concentric fitting and large pipe assembly. Ensure small diameter pipe is bottomed and cemented in y concentric fitting. 6. Secure assembly to structure as shown in figure 25 using field- supplied metal strapping or equivalent support mate...
Page 30
30 12” minimum clearance above highest anticipated snow level 12” minimum clearance above highest anticipated snow level 24” minimum separation. Exhaust must be at same level or above intake terminal. Direct vent diagram figure 29. Figure 31. Figure 32. Figure 33. Figure 30. When direct venting thro...
Page 31
31 vent pipe preparation 1. Initial preparation. A.) make sure the solvent cement you are planning to use is designed for the specific application you are attempting. B.) know the physical and chemical characteristics and limitations of the pvc and cpvc piping materials that you are about to use. C....
Page 32
32 b. Deburring use a knife, plastic pipe deburring tool, or file to remove burrs from the end of small diameter pipe. Be sure to remove all burrs from around the inside as well as the outside of the pipe. A slight chamfer (bevel) of about 10°-15° should be added to the end to permit easier insertio...
Page 33
33 controls and switches this model is provided with three pressure switches. These switches are essential to the safe and proper operation of the unit. All switches are wired in series. The controller is set up to shut the unit down whenever there is a failure of any of the switches. It is importan...
Page 34
34 caution label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation after servicing. Power vent wiring schematic - figure 35. This water heater is polarity sensitve. Before applying electricity to this heater be...
Page 35
35 warning: if you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner ...
Page 36
36 valves for reducing the point-of-use temperature by mixing cold and hot water are available, see figure 8. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority. The table below shows the approxima...
Page 37
37 user input buttons • the up and down buttons are used to navigate menus and adjust user settings. • the operational buttons are used to enter/exit menus, select menu items, activate adjustment modes and confirm or cancel new user settings. The operational buttons are multifunctional, their curren...
Page 38
38 status icons the status icons are displayed on the desktop screen and convey operational and diagnostic information. The icons are described in the table below. Table 9 icon description water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in re...
Page 39
39 operating states the current operational state of the water heater is displayed on the desktop screen as the "status." the common operational states are described in the table below. Table 10 state description standby the water heater is not in an active heating cycle. Ie: the tank temperature is...
Page 40
40 user settings & control system menus temperatures operating set point and differential adjustment the operating set point is adjustable from 90°f (42°c) to 180°f (82°c) for commercial and 160°f (71°c) on residential models. The factory setting is 120°f (49°c). The differential is adjustable from ...
Page 41
41 temperatures (cont) description/action display • tank temperature - non adjustable - control system sensed temperature from the temperature probe. • tank probe offset - adjustable user setting, range -5° to +5° (factory setting 0°). The tank probe offset is used to calibrate control system temper...
Page 42
42 display settings description/action display select display settings from the main menu and press the operational button under "select" to enter this menu. This menu contains adjustable display options for viewing information on the lcd screen. Use the up & down buttons to navigate the menu. • tem...
Page 43
43 current fault description/action display select current fault from the main menu and press the operational button under "select" to enter this menu. This menu contains non adjustable operational information. Use the up & down buttons to navigate the menu. This menu contains the current fault or a...
Page 44
44 service contact information the control system has a discrete menu that installing contractors and/or service agents can access to enter contact information for their customers. This contact information will be displayed with all fault and alert messages. Description/action display from the deskt...
Page 45
45 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 off of oil from metal parts, and will disappear in a short while. Thermal expansion water supply systems may, because of such events as high line pr...
Page 46
46 venting system inspection at least once a year a visual inspection should be made of the venting system. You should look for: 1. Obstructions which could cause improper venting. The combustion and ventilation air flow must not be obstructed. 2. Damage or deterioration which could cause improper v...
Page 47
47 burn harzard. Hot water discharge. Keep hands clear of drain valve discharge. 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...
Page 48
48 maintenance temperature-pressure relief valve test burn hazard. Hot water discharge. Keep clear of temperature- pressure relief valve discharge outlet. It is recommended that the temperature-pressure relief valve should be checked to ensure that it is in operating condition every 6 months. When c...
Page 49
49 never use this water heater unless it is completely filled with water. To prevent damage to the tank, the tank must be filled with water. Water must flow from the hot water faucet before turning “on” gas to the water heater. A *condensation may be seen on pipes in humid weather or pipe connection...
Page 50
50 troubleshooting flow chart. 1. When the control system is first powered, during boot up, it will display water heater model information during initialization. After a few moments the control system lcd which is part of the uim (user interface module) will display the default screen known as the "...
Page 51
51 sequence of operation flow chart yes no water is heated to set point 24 v gas valve de-energized 15 second inter-purge cycle 24 v gas valve de-energized retries up to two more times 60 second post-purge cycle control system locks out “ignition failure” fault msg is displayed water heater goes int...
Page 52: Caution
52 if the main burner ignites momentarily but does not sustain ignition allow the water heater to try to ignite up to two more times until control system locks out and the ignition failure fault message is displayed on the control system's lcd. If the water heater is experiencing rough starts - see ...
Page 53
53 note: if you are not qualified and licensed or certified as required by the authority having jurisdiction to perform a given task do not attempt to perform any of the diagnostic or service procedures described in the following section. If you do not understand the instructions in the following se...
Page 54
54 fault and alert messages call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in your area. Possible causes - check/repair displayed fault/alert message • the water heater’s control system is polarity sensitive an...
Page 55
55 fault and alert messages (cont) call the technical support phone number listed on the back cover for further technical assistance or to locate a qualified service agent in your area. Possible causes - check/repair displayed fault/alert message • the control system has detected the blower prover s...
Page 56
56 notes.
Page 57
57 notes.
Page 58
58 notes.
Page 59
59 limited warranty a. O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this water heater. 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 ther...
Page 60
60 www.Hotwater.Com 500 tennessee waltz parkway, ashland city, tn 37015 tech support: 800-527-1953 parts: 800-433-2545 copyright © 2012 a. O. Smith water heater company, all rights reserved..