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6

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 Engineers

• 

AHRI - Air Conditioning, Heating and Refrigeration Institute

• 

NEC - National Electrical Code

• 

NFPA - National Fire Protection Association

• 

UL - Underwriters Laboratory

QUALIFICATIONS

QUALIFIED INSTALLER OR SERVICE AGENCY

Installation  and  service  of  this  water  heater  requires  ability 

equivalent  to  that  of  a  Qualified Agency  (as  defined  by ANSI 

below) in the field involved. Installation skills such as plumbing, 

air supply, venting, gas supply and electrical supply are required 

in addition to electrical testing skills when performing service.

ANSI Z223.1 2006 Sec. 3.3.83:

  “Qualified  Agency”  -  “Any 

individual, firm, corporation or company that either in person or 

through a representative is engaged in and is responsible for (a) 

the installation, testing or replacement of gas piping or (b) the 

connection, installation, testing, repair or servicing of appliances 

and equipment; that is experienced in such work; that is familiar 

with all precautions required; and that has complied with all the 

requirements of the authority having jurisdiction.”
If you are not qualified (as defined by ANSI above) and licensed 

or  certified  as  required  by  the  authority  having  jurisdiction 

to  perform  a  given  task  do  not  attempt  to  perform  any  of  the 

procedures described in this manual. If you do not understand 

the instructions given in this manual do not attempt to perform 

any procedures outlined in this manual.

PREPARING FOR THE INSTALLATION

1.  Read the entire manual before attempting to install or operate 

the water heater. Pay close attention to the General Safety 

Information on Page 4 and 5. If you don’t follow the safety 

rules, the water heater may not operate safely. It could cause 

property damage, injury and/or death.
This  manual  contains  instructions  for  the  installation, 

operation,  and  maintenance  of  the  water  heater.  It  also 

contains warnings throughout the manual that you must read 

and be aware of. All warnings and all instructions are essential 

to the proper operation of the water heater and your safety. 
Detailed installation diagrams are also found in this manual. 

These  diagrams  will  serve  to  provide  the  installer  with  a 

reference.  It  is  essential  that  all  venting,  water  piping,  gas 

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 section on Page 7 in this manual. 

Use this reference to locate and identify various components 

on the water heater.

INTRODUCTION

Service and diagnostic procedures should only be performed 

by a Qualified Service Agency.

NOTE:

  Costs  to  correct  installation  errors  are  not  covered 

under the limited warranty.

2.  Be  sure  to  turn  off  power  when  working  on  or  near  the 

electrical system of the water heater. Never touch electrical 

components with wet hands or when standing in water.

3.  The installation must conform to all instructions contained in 

this manual and the local code authority having jurisdiction. 

These  shall  be  carefully  followed  in  all  cases.  Authorities 

having  jurisdiction  should  be  consulted  before  installation 

begins if there are any questions regarding compliance with 

local, state or national codes.
In the absence of local codes, the installation must comply 

with  the  current  editions  of  the  National  Fuel  Gas  Code, 

ANSI  Z223.1/NFPA  54  and  the  National  Electrical  Code, 

NFPA  70,  the  Natural  Gas  and  Propane  Installation  Code. 

NFPA documents are also available from the National Fire 

Protection  Association,  1  Batterymarch  Park,  Quincy,  MA 

02269.

4.  If  after  reading  this  manual  you  have  any  questions  or  do 

not  understand  any  portion  of  the  instructions,  call  the  toll 

free number on the back cover of this manual for technical 

assistance. In order to expedite your request, please have the 

full Model, Serial and Series number of the water heater you 

are working with available for the technician. This information 

is located on the water heater’s rating label.

5.  Carefully plan the placement of the water heater. Examine 

the location to ensure that it complies with the requirements 

in  Determine  Water  Heater  Location  on  Page  11  and  the 

Rough in Dimensions on Page 10.

6.  For installation in California this water heater must be braced 

or anchored to avoid falling or moving during an earthquake. 

See  instructions  for  correct  installation  procedures. 

Instructions  may  be  obtained  from  California  Office  of  the 

State Architect, 1102 Q Street, Suite 5100, Sacramento, CA 

95811.

Summary of Contents for XWH 150

Page 1: ...ATION 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 n...

Page 2: ...An Existing Vent System To Install A New Water Heater 14 When Removing A Water Heater From Existing Common Vent System 14 Removing A Water Heater From Wood Pallet 15 Gas Conversions 15 Leveling The Wa...

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: ...ce connected to the hot 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...

Page 5: ...re placing water heater in operation Disconnect gas piping at main gas shutoff valve before leak testing heater Install sediment trap in accordance with NFPA 54 or CAN CSA B149 1 Use joint compound or...

Page 6: ...his manual These diagrams will serve to provide the installer with a reference It is essential that all venting water piping gas piping and wiring be installed as shown Particular attention should be...

Page 7: ...7 FEATURES AND COMPONENTS Left Side Inside Out Models 285 Rear View Models 285 Left Side Inside Out Models 150 200 Rear View Models 150 200 MODELS 150 200 MODEL 285...

Page 8: ...13 33 11 40 27 14 15 6 4 8 1 16 3 21 10 36 2 41 5 23 34 20 7 28 19 Left Side Inside Out Models 600 800 Rear View Models 600 800 Left Side Inside Out Models 400 500 Rear View Models 400 500 MODELS 400...

Page 9: ...pecially designed coils for maximum heat transfer while providing protection against flue gas corrosion The coils are encased in a jacket that contains the combustion process 2 Combustion Chamber Acce...

Page 10: ...ANE GAS NATURAL GAS PROPANE GAS NATURAL GAS PROPANE GAS XWH 150 0 22 W C 0 054 kPa 0 23 W C 0 057 kPa 4 W C 1 kPa 8 W C 2 kPa 14 W C 3 49 kPa 14 W C 3 49 kPa XWH 200 0 39 W C 0 09 kPa 0 39 W C 0 09 kP...

Page 11: ...aust venting Use only the vent materials and methods specified in this Instruction Manual 2 Standard XP water heaters are equipped to operate from sea level to 4 500 feet only with no adjustments The...

Page 12: ...ES Clearances from combustible materials 1 Hot water pipes at least 1 4 from combustible materials 2 Vent pipe at least 1 from combustible materials 3 See Figure s 2 and 3 below for other clearance mi...

Page 13: ...om are needed when clearances around the XP water heater are at least equal to the SERVICE clearances shown in Figure s 2 and 3 For spaces that do NOT supply this clearance provide two openings as sho...

Page 14: ...us conditions of use 7 Any improper operation of the common venting system should be corrected so the installation conforms with the National Fuel Gas Code ANSI Z223 1 NFPA 54 and or CAN CSA B149 1 Na...

Page 15: ...er remove the parts box 2 Remove the front door to access the lag bolts in front of the unit see Figure below 3 To remove the water heater from the pallet after removing the front door Remove the two...

Page 16: ...lled Failure to comply will cause a gas leak resulting in severe personal injury or death Model 500 1 Remove the top access covers from the unit no tools required for removal 2 Turn the adjustment scr...

Page 17: ...ore details Figure 11 PVC CPVC Concentric Sidewall Termination Models 150 600 Only See Page 28 for more details Figure 12 Two Pipe Vertical Termination See Page 31 for more details Figure 13 PVC CPVC...

Page 18: ...nsate will not become trapped in a section of vent pipe and therefore reduce the open cross sectional area of the vent INSTALL VENT AND COMBUSTION AIR PIPING This water heater must be vented and suppl...

Page 19: ...missions causing severe personal injury or death SIZING This water heater uses model specific combustion air intake and vent piping sizes as detailed in Table below Table 8 Air Intake Vent Piping Size...

Page 20: ...hrough the roof or through a sidewall Follow the procedures in this manual for the method chosen Refer to the information in this manual to determine acceptable vent and air piping length OPTIONAL ROO...

Page 21: ...Models 700 800 POLYPROPYLENE This product has been approved for use with the Polypropylene vent with the manufacturers listed in Table 12 All terminations must comply with listed options in this manu...

Page 22: ...approved vent adapters Do not use CPVC starter piece All vent connections MUST be secured by the vent manufacturer s joint connector Figure 20 Insulation should not be used on polypropylene venting m...

Page 23: ...d Security Chimney Secure Seal ICC VIC Use of FasNSeal Flex smooth inner wall vent is to be used in vertical or near vertical sections only taking precaution to ensure no sagging occurs of the vent sy...

Page 24: ...manual 2 You must consider the surroundings when terminating the vent and air a Position the vent termination where vapors will not damage nearby shrubs plants or air conditioning equipment or be obje...

Page 25: ...gure 23 c Do not terminate closer than 4 feet horizontally from any electric meter gas meter regulator T P Relief Valve or other equipment Never terminate above or below any of these within 4 feet hor...

Page 26: ...andard constructions per the directions found in this manual 9 Stainless steel terminations are designed to penetrate walls with a thickness up to 9 25 inches of standard construction SIDEWALL DIRECT...

Page 27: ...ngs thoroughly with exterior caulk Figure 31 Polypropylene Sidewall Termination Assembly Figure 32 A Typical Sidewall Termination Assembly Models 150 800 PVC CPVC or Stainless Steel MULTIPLE VENT AIR...

Page 28: ...ATIONS 1 Determine the best location for the termination kit see Figure above 2 Reference the Determine Location section on Page 24 of this manual for general termination considerations 3 Cut one 1 ho...

Page 29: ...dimension D more than 60 inches see Figures 38 and 39 If assembly depth needs to be reduced dimension D can be as short as possible Figure 38 Concentric Vent Dimensional Drawing Models 150 200 NOTE I...

Page 30: ...rminations be made as shown to avoid recirculation of flue gases DO NOT use field supplied couplings to extend pipes Airflow restriction will occur and may cause intermittent operation 8 Cement applia...

Page 31: ...in an up turned coupling as shown in Figure 43 The top of the coupling must be at least 1 foot above the air intake When the vent termination uses a rain cap as illustrated in Figure 44 maintain at le...

Page 32: ...eilings and roofs 5 Provide flashing and sealing boots sized for the vent pipe and air pipe MULTIPLE VENT AIR TERMINATIONS 1 When terminating multiple XP water heaters terminate each vent air connecti...

Page 33: ...e screw assembly method drill a clearance hole in the rain cap and a pilot hole in the vent pipe for the screw size being used Failure to drill adequate holes may cause cracking of PVC components allo...

Page 34: ...or recirculation of combustion products may occur Water may also collect inside the larger combustion air pipe and flow to the burner enclosure Failure to follow this warning could result in product d...

Page 35: ...to the appropriate example Installation must comply with local requirements and with the National Fuel Gas Code The maximum allowable equivalent vent and air intake lengths for this venting arrangemen...

Page 36: ...ystem volume and capacity 6 Install a drain valve at the lowest point of the system 7 This appliance is supplied with a Temperature Pressure Relief Valve sized in accordance with ASME Boiler and Press...

Page 37: ...due to water chemistry generally shows up first in the hot water system because heated water increases the rate of corrosive chemical reactions PIPING COMPONENTS WATER HEATER SYSTEM PIPING Water heat...

Page 38: ...urer s instructions for each system component The installer is responsible for compliance with local codes The piping will not support the weight of the water heater circulator pump Do not attempt to...

Page 39: ...ponsible for compliance with local codes The piping will not support the weight of the water heater circulator pump Do not attempt to support the weight of the water heater circulator pump with the pi...

Page 40: ...urer s instructions for each system component The installer is responsible for compliance with local codes The piping will not support the weight of the water heater circulator pump Do not attempt to...

Page 41: ...ponsible for compliance with local codes The piping will not support the weight of the water heater circulator pump Do not attempt to support the weight of the water heater circulator pump with the pi...

Page 42: ...1 2 PSIG 3 5 kPa c The appliance and its gas connection must be leak tested before placing it in operation GAS CONNECTIONS CONNECTING GAS SUPPLY PIPING 1 Remove the top access panel and refer to Figu...

Page 43: ...hat pipe dope does not block gas flow Failure to apply pipe sealing compound as detailed in this manual can result in severe personal injury death or substantial property damage XP water heaters are t...

Page 44: ...190 1 980 1 820 1 700 4 17 500 12 000 9 660 8 270 7 330 6 640 6 110 5 680 5 330 5 040 4 460 4 050 3 720 3 460 XP water heaters are typically shipped ready to fire on natural gas Check the water heate...

Page 45: ...ignition failure The problem is especially noticeable in NEW Propane LP installations and also in empty tank situations This can also occur when a utility company shuts off service to an area to prov...

Page 46: ...rough the knockouts in the rear of the water heater as shown in Figure 71 2 Connect low voltage wiring to low voltage connection board as shown in Figure 72 on Page 48 of this manual and the water hea...

Page 47: ...age Connection Boards Figure 72 If more than two water heaters are on the Lead Lag daisy chain the wiring from the Lead Lag terminals on the second water heater to the Lead Lag terminals on the third...

Page 48: ...48 Figure 72 Low Voltage Field Wiring Connections...

Page 49: ...rom multiple condensing appliances CONDENSATE DISPOSAL CONDENSATE DRAIN 1 This water heater is a high efficiency appliance that produces condensate 2 The side of the water heater has a 1 2 inch PVC un...

Page 50: ...e Failure to fill the trap could result in severe personal injury or death FINAL CHECKS BEFORE STARTING THE WATER HEATER Read the XP Water Heater Service Handbook to familiarize with Control Module op...

Page 51: ...rs verify conversion 1 Verify propane conversion has been completed per the Propane Conversion instructions DO NOT adjust gas valve outlet pressure The gas valve is factory set for the correct outlet...

Page 52: ...art 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 OPERATING...

Page 53: ...53 OPERATING INSTRUCTIONS FOR MODELS 400 800...

Page 54: ...ol module regulates blower speed to control the water heater firing rate The gas valve senses the amount of air flowing into the water heater and allows only the right amount of gas to flow CONTROL IN...

Page 55: ...t high limit The automatic reset high limit has a set point of 200 F and the manual reset high limit has a maximum set point of 210 F When the outlet temperature exceeds 200 F the automatic high limit...

Page 56: ...for heat is satisfied the control will de energize the gas valve The blower will continue to run during the postpurge 8 The water heater pump will continue to run for its respective pump delay time b...

Page 57: ...LAY Tank Temperature 71 F Operating Setpoint 184 F Status Ignition HELP DISABLE A O Smith XP MENU OFF GAS O N LCD Touch Screen Display Status Icons Main Menu Help Menu Enable Disable Button Figure 75...

Page 58: ...em or when the Enable Disable switch on the display is in Disable position or Building Management system Enable Disable circuit is an open circuit Display will read Status Water Heating Disabled The C...

Page 59: ...er heater components are displayed in this menu Display Settings Temperature units F or C the LCD appearance brightness contrast and backlight delay user adjustable settings are located in this menu H...

Page 60: ...on per Start Up section of this manual Flame inspection stable uniform Flame signal at least 10 microamps at high fire Clean the heat exchanger if flue temperature is more than 54 F above return water...

Page 61: ...ment from inside the water heater and components Remove any obstructions CLEAN CONDENSATE TRAP 1 Inspect the condensate drain line condensate PVC fittings and condensate trap 2 Remove the PVC cap reta...

Page 62: ...a thermal expansion tank waterlogging or undersizing INSPECT IGNITION AND FLAME SENSE ELECTRODES 1 Remove the ignition and flame sense electrodes from the water heater heat exchanger access cover 2 Re...

Page 63: ...anger to thoroughly dry 10 Remove the field supplied rear refractory cover from the back of the combustion chamber of the heat exchanger and reassemble 11 Close isolation valves on piping to isolate w...

Page 64: ...tual switch states may vary from those shown on diagrams depending upon whether utilities are connected or a fault condition is present 2 See wiring diagram for additional notes LOW VOLTAGE 120 VAC HI...

Page 65: ...ptions Replacement high vo ltage spark lead and ribbon cables must be purchased from the factory Use of a non approved spark lead or ribbon cables can lead to operational problems which could result i...

Page 66: ...66 NOTES...

Page 67: ...follow applicable codes Failure to follow printed instructions Abuse misuse accident fire flood Acts of God Improper installation sizing delivery or maintenance Claims related to rust noise smell or t...

Page 68: ...500 Tennessee Waltz Parkway Ashland City TN 37015 Technical Support 800 527 1953 Parts 800 433 2545 www hotwater com Copyright 2016 A O Smith All rights reserved...

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