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MODELS HW-120M, 160M, 200M, 225M
COMMERCIAL GAS COPPER HEAT EXCHANGER WATER HEATER
Including Models with Intermittent Pilot Ignition (I.I.D.)
•
Installation
WARNING: If the information in these
instructions are 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.
PRINTED IN U.S.A. 0905
BURKAY UP-FLOW MODELS
•
Operation
•
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE
Maintenance
•
Limited Warranty
TEXT PRINTED OR OUTLINED IN RED CONTAINS
INFORMATION RELATIVE TO YOUR SAFETY. PLEASE READ
THOROUGHLY BEFORE USING APPLIANCE.
A DIVISION OF A.O. SMITH CORPORATION
McBEE, SOUTH CAROLINA, USA
STRATFORD, ONTARIO, CANADA
VELDHOVEN, THE NETHERLANDS
1
CAUTION
RENTON, WA, USA
www.hotwater.com
PART NO. 212626-000
SUPERSEDES PART NO. 192011- 000 REV.4
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Table of Contents
Related Manuals for A.O. Smith 160M
Summary of Contents for A.O. Smith 160M
- Page 1 MODELS HW-120M, 160M, 200M, 225M COMMERCIAL GAS COPPER HEAT EXCHANGER WATER HEATER BURKAY UP-FLOW MODELS Including Models with Intermittent Pilot Ignition (I.I.D.) • Installation WARNING: If the information in these instructions are not followed exactly, a fire or explosion may result causing property damage, personal injury or death.
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Page 2: Rough-In Dimensions
F° 20F° 30F° Model Btuh C° 11.1C° 16.6C° 20C° 22.2C° 27.7C° 30C° 33.3C° 38.8C° 40C° 120,000 HW-120M 2290 1527 160,000 HW-160M 2941 1961 199,000 HW-200M 3737 2491 225,000 GPH 1096 HW-2250M 4149 2766 Recovery rating of models shown in chart above are obtained by actual efficiency test data by recognized Certification Agency. -
Page 3: Table Of Contents
FOREWORD This design complies with the latest edition of the ANSI Standard Z21.10.3 for gas water heaters Vol. III Storage Water Heaters with input ratings above 75,000 BTU per hour Circulating and Instantaneous. Detailed installation diagrams are in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping suggested. -
Page 4: Grounding Instructions
Correct orifice sizing and parts may be obtained from A.O. Smith Water Products Company. When ordering, be sure to state the model number and the altitude of the location where the water heater is being installed. -
Page 5: Features
LIGHTING AND OPERATING instructions. The thermal balancer (standard on Models HW-200M and HW-225M, optional on Models HW-120M and HW-160M) is a snap-acting single-pole thermal relay used only on Cer-Temp 80 Recovery systems. It gives immediate pump start but delay of pump shutoff for approximately 2 minutes. -
Page 6: Circulating Pump
4. Discontinues ignition spark when the pilot flame is established. The S-8600 control used on propane gas models provides safety lockout if the pilot fails to ignite within the pilot flame establishing period. The S-8600 control used on natural gas models continues trial for ignition until pilot flame is established. -
Page 7: Drain Valve (Not Supplied)
“no flow” condition. 4. Replace the flow switch cover. TABLE 5 - SAFETY FLOW SWITCH SETTINGS Minimum Flow Rate (GPM) Contacts Close Model HW-120M,160M HW-200M 15.9 HW-225M 22.0 FIGURE 5 The installer is cautioned to follow the manufacturer’s instructions exactly when inserting this switch into a pipe tee. This is necessary in order to assure positive action of the switch with water flow. -
Page 8: Installation Instructions
INSTALLATION INSTRUCTIONS IMPORTANT Strict adherence to installation wiring diagrams shown in this manual is required to prevent constant pump operation when the system temperature control is satisfied, otherwise the warranty is void as stipulated under item 2a (6) of the LIMITED WARRANTY. REQUIRED ABILITY INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED... -
Page 9: Venting
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 BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2,225mm /Kw)of the total input of all appliances in the enclosure, but not less than 100 square inches... -
Page 10: Relief Valve
Your local code authority may have other specific relief valve requirements not covered in this section. THE PURPOSE OF A RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE OR TEMPERATURE INTO THE STEAM RANGE, WHICH MAY CAUSE SCALDING AT FIXTURES, TANK EXPLOSION, SYSTEM OR HEATER DAMAGE. -
Page 11: Piping Diagrams
PIPING DIAGRAMS TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 19. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. (USE THIS DIAGRAM FOR STRAIGHT RECOVERY SYSTEMS SUPPLYING... - Page 12 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 19. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. FIGURE 8...
- Page 13 DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 19. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES. FIGURE 9 FIGURE 10...
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Page 14: Gas Connections
If gas meter is too small, ask the gas company to install a larger meter having adequate capacity. TABLE 6 GAS SUPPLY PIPE SIZES (IN INCHES) NATURAL GAS (1050 Btu/ft HW-160M HW-200M HW-225M 1 1/4 1 1/4 1 1/4... -
Page 15: Electrical Information
ELECTRICAL WIRING DIAGRAMS FOR THE HW-120M, 160M, 200M AND 225M WATER HEATERS Figures 11 and 12 show the heater mounted controls as they are wired when the heater leaves the factory. Using the individual... - Page 16 ELECTRICAL WIRING DIAGRAMS FOR THE HW-120M, 160M, AND 200M WATER HEATERS I.I.D. SYSTEM (PROPANE) FIGURE 12 NOTES:...
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Page 17: Operation
OPERATION IMPORTANT Only qualified personnel shall perform the initial firing of the heater. At this time the user should not hesitate to ask the start-up technician any questions regarding the operation and maintenance of the unit. Lighting and Operating instructions are included with this manual. By using these instructions, the user may be able to make minor operational adjustments and save unnecessary service calls. -
Page 18: Operating Instructions For I.i.d Models
OPERATING INSTRUCTIONS FOR I.I.D. MODELS The I.I.D. models have an automatic intermittent spark ignition system, figure 3, mounted on the jacket at the front of the heater which ignites the pilot gas whenever system controls call for heat. Start the unit in accordance with the instructions on the operating label attached to the heater. These instructions are repeated in the following. -
Page 19: Checking And Adjusting The Input
TABLE 8 — TIME REQUIRED TO CONSUME 1 CUBIC FT. OF GAS (Heater operating at full input or full capacity. Does not apply to high altitude installations.) Heating Total Time Required (Seconds) Value Type of (Btu/ Cu. Ft.) HW-120M HW-160M Natural 1050 31.5 23.6 Propane 2500 78.3 56.3 MODEL... -
Page 20: Service Information
SERVICE INFORMATION 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 service personnel, using appropriate test equipment, be allowed to service the heater. Any safety devices used in conjunction with this appliance should receive periodic (at least twice a year) inspection to assure proper operation. -
Page 21: Protector Switch (Coil High Limit-All Heaters)
PILOT BURNER USED ON I.I.D. SYSTEMS FIGURE 15 PROTECTOR SWITCH (Coil High Limit - All Heaters) If the protector switch, fig 2, should shut off unit, check for the following conditions: 1. No water in heater. 2. Restricted water flow through the heater. 3. -
Page 22: Gas Pressure Regulator
CAUTION DO NOT USE A NYLON BRUSH OR OTHER STATIC CREATING MATERIAL TO CLEAN DUST AND CARBON DEPOSITS FROM HEATING SURFACES AND VENT. SUCH DEPOSITS ARE FLAMMABLE AND MAY BE IGNITED BY STATIC ELECTRICITY. USE A METAL BRUSH TO MINIMIZE THE DANGER OF EXPLOSION. -
Page 23: Deliming Solvents
The usage of water softening equipment greatly reduces the hardness of the water. However, this equipment does not always remove all of the hardness (lime). For this reason it is recommended that a regular schedule for deliming be maintained. The time between cleaning will vary from weeks to months depending upon water conditions and usage. -
Page 24: Checkout
REMOVING SILICATE Ammonium bifluoride flakes (NH FlHF) are used in conjunction with A. O. Smith UN•LIME delimer and pump type deliming kit, part no. 4930, to delime and remove siliceous materials from copper coil water heaters. CHECKOUT The checkout sequence should be used as an on-the-job trouble- shooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. - Page 25 S8600 (NATURAL GAS AND LP GAS) INTERMITTENT PILOT SYSTEM TROUBLESHOOTING NO SPARK AT PILOT BURNER Replace ignition module. Turn on gas supply. turn on power supply. Securely connect cable and/or ground wire. Carefully bend downward top of ground strap to achieve 1/8” spark gap.
- Page 26 S8600 (NATURAL GAS AND LP GAS) INTERMITTENT PILOT SYSTEM TROUBLESHOOTING SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT Attach wires firmly. Replace gas valve. Turn on power supply Securely connect cable and/or ground wire. Replace pilot burner Is pilot burner ignition cable in good condition (not brittle, burnt, or cracked)? and/or ground wire.
- Page 27 INTERMITTENT PILOT SYSTEM TROUBLESHOOTING PILOT BURNER LIGHTS BUT MAIN BURNER DOES NOT LIGHT Correct the situation by consulting the installation or user’s manual on how to adjust pilot flame. Replace Is voltage (24 Vac) across terminals ignition MV & MV/PV? module.
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Page 28: Limited Warranty
MODEL HW LIMITED WARRANTY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 1. If within FIVE years after initial installation of this water heater, a heat exchanger, coil or gas burner shall prove upon examination by the warrantor to be defective in material or workmanship, the warrantor, at his option will exchange or repair such part or portion.
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Questions and answers
I have lime deposits and soot on the boiler's heat exchanger. What is your recommended process for removing the lime deposits?
The recommended process for removing lime deposits from the heat exchanger of an A.O. Smith boiler with part number 160M is as follows:
1. Use UN•LIME® deliming solvent as recommended.
2. Fill the heater with UN•LIME® until foaming action stops.
3. Wait 10 to 15 minutes after foaming stops to let UN•LIME® dissolve remaining scale.
4. Open the drain valve and drain all UN•LIME® from the heater.
5. Remove the standpipe and drain hose assembly and reinstall original fittings.
6. Open valve “A” to flush the heater with fresh water through the drain valve for 3 to 5 minutes.
7. Close the drain valve and open valve “B” to resume normal operation.
For heavy lime deposits:
- Use a deliming pump kit (A.O. Smith part no. 4930) or contact a service agency if the solvent does not pass through clogged coils or the heat exchanger.
This answer is automatically generated