Oil-Fired
Water Heater
INSTALLATION
MANUAL
NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held
liable for typographical errors in literature.
120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
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The following defined terms are used throughout this manual to bring attention to the presence of
hazards of various risk levels or to important product information.
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or
serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
FOREWORD
This manual is intended to be used in conjunction with other literature provided with the heater. This
includes power burner and related control information. It is important that this manual, and additional
publications such as the Oil Burner manual and the Control manual, be reviewed in their entirety before
beginning any work.
Installation should be made in accordance with the regulations of the local code authorities and utility
companies that pertain to this type of water heating equipment.
MAKE SURE the fuel on which the heater will operate is the same as that specified on the heater model
and rating plate.
Installation or service of this water heater must be performed by licensed professionals where plumbing,
air supply, venting, oil burner license and electrical work are required.
FOR THE INSTALLER
Valves that reduce point-of-use temperature by mixing cold and hot water, as well as inexpensive devices
that attach to faucets and limit hot water temperatures, are available. These valves or devices may be
required in your area. Check local code requirements.
The installer should be guided by instructions furnished with the heater, local codes and utility company
requirements. Preference should be given to codes and requirements where they differ from the heater
furnished instructions.
Additional publications which should guide the installer include:
The latest version of the National Fuel Gas Code, ANSI Z223.1, from American Gas Association
Laboratories, 8501 East Pleasant Valley Road, Cleveland, OH 44131.
In Canada – CGA No. B149 (latest version), from Canadian Gas Association Laboratories, 55 Scarsdale
Road, Don Mills, Ontario, Canada M3B 2R3.
Code for the installation of Heat Producing Appliances (latest version), from American Insurance
Association, 85 John Street, New York, NY 11038.
The latest version of the National Electrical Code, NFPA No. 70.
In Canada, refer to Canadian Electrical Code C 22.1, from Canadian Standards Association, 5060
Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.
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TABLE OF CONTENTS
PART 1: GENERAL SAFETY INFORMATION ............................................................................................ 5
A. PRECAUTIONS ............................................................................................................................... 5
B. CHEMICAL VAPOR CORROSION.................................................................................................. 5
C. IMPROPER COMBUSTION ............................................................................................................ 6
D. EXTENDED NON-USE PERIODS .................................................................................................. 6
E. INSULATION BLANKETS ................................................................................................................ 6
PART 2: SPECIFICATIONS ......................................................................................................................... 6
PART 3: LOCATING THE HEATER ............................................................................................................ 6
PART 4: INSTALLATION INSTRUCTIONS ................................................................................................. 8
PART 5: LEVELING AND CLEARANCES .................................................................................................. 8
A. LEVELING ........................................................................................................................................ 8
B. CLEARANCES ................................................................................................................................. 8
PART 6: AIR REQUIREMENTS ................................................................................................................... 9
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A. UNCONFINED SPACE .................................................................................................................... 9
B. CONFINED SPACE ......................................................................................................................... 9
PART 7: THERMAL EXPANSION (CLOSED SYSTEMS) ........................................................................ 10
PART 8: VENTING ..................................................................................................................................... 10
A. VENT CONNECTOR ..................................................................................................................... 11
B. BAROMETRIC DRAFT CONTROL ASSEMBLY ........................................................................... 11
PART 9: ELECTRICAL CONNECTIONS ................................................................................................... 12
PART 10: WATER CONNECTIONS .......................................................................................................... 12
PART 11: OIL LINE CONNECTIONS ........................................................................................................ 13
A. SINGLE LINE SYSTEM ................................................................................................................. 13
B. TWO LINE SYSTEM ...................................................................................................................... 13
C. SUCTION LINE .............................................................................................................................. 13
D. RETURN LINE ............................................................................................................................... 14
E. PRESSURE TEST FOR BURIED OIL LINES ............................................................................... 14
F. MISCELLANEOUS INFORMATION .............................................................................................. 14
PART 12: PRIMING THE FUEL UNITS ..................................................................................................... 14
A. SINGLE LINE SYSTEM ................................................................................................................. 14
B. TWO LINE SYSTEM ...................................................................................................................... 15
PART 13: STARTING THE HEATER ......................................................................................................... 15
A. FILLING THE HEATER WITH WATER ......................................................................................... 15
B. TO PUT THE HEATER IN OPERATION ....................................................................................... 15
If the heater is exposed to the following, do not operate until all corrective steps have been made by a
qualified serviceman.
1. FIRE
2. DAMAGE
3. FIRING WITHOUT WATER
4. SOOTING
5. SUBMERSION IN WATER
The heater must be protected from freezing downdrafts during shutdown periods.
Corrosion of the flueways and vent system may occur if combustion air contains certain chemical vapors
which break down into acids at high temperature. Such corrosion may result in failure of burner and risk
of asphyxiation.
C. USING INSTRUMENTS TO ADJUST THE FLAME ...................................................................... 15
D. DRAFT ........................................................................................................................................... 16
E. NOZZLE (OIL INPUT) VARIATIONS ............................................................................................. 16
PART 14: IMPORTANT INSTALLATION AND MAINTENANCE REMINDERS ....................................... 16
A. INSTALLATION.............................................................................................................................. 16
B. MAINTENANCE ............................................................................................................................. 16
PART 15: REPLACEMENT PARTS .......................................................................................................... 18
PART 1: GENERAL SAFETY INFORMATION
A. PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDERWATER. Immediately call a qualified
service technician. Replace any part of the control system or oil control that has been under water.
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B. CHEMICAL VAPOR CORROSION
Examples of potentially corrosive materials include: Spray can propellants, cleaning solvents, refrigerator
and air conditioning refrigerants, swimming pool chemicals, calcium and sodium chloride (water softener
salt), waxes, and process chemicals. Do not store products of this sort near the heater.
Also, air which is brought in contact with the heater should not contain any corrosive chemicals. If
necessary, uncontaminated air should be obtained from remote or outside sources.
NOTE: DAMAGE TO THE WATER HEATER CAUSED BY EXPOSURE TO CORROSIVE VAPORS IS
NOT COVERED BY WARRANTY. (Refer to the limited warranty for complete terms and conditions).
Do not obstruct the flow of combustion and ventilating air. Adequate air must be provided for safe
operation.
Attic and/or exhaust fans operating on the premises with a water heater can result in carbon monoxide
poisoning and death. Operating these fans can produce a down draft in the area of the water heater,
preventing exhaust from escaping through the chimney or vent pipe.
The venting of the water heater should be inspected by a qualified service technician at the time of
installation, and periodically thereafter, to ensure a down-draft condition does not exist.
Hydrogen gas can be produced in a hot water system served that has not been used for a long period of
time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE.
To reduce risk of injury under these conditions, it is recommended to open a hot water faucet at a
convenient sink for several minutes before using any electrical appliance connected to the hot water
system. THERE MUST BE NO SMOKING OR FLAME NEAR THE OPEN FAUCET. If hydrogen is
present, there will probably be an unusual sound, such as air escaping through the pipe as water begins
to flow.
Application of an insulation blanket will VOID THE WARRANTY for this water heater. Furthermore, an
insulation blanket may interfere with the operation of this water heater, possibly resulting in property
damage, injury, or death.
MODEL
STORAGE
CAP. (GAL.)
FLUE
WATER
CONNECT.
DRAIN
CONNECT.
HEIGHT/DIA.
SHIP
WEIGHT
D.O.E.
ENERGY
OFT-30
30
6”
¾”
INSTALLED
51”, 22”
171 LBS.
0.576
OFT-50
50
6”
¾”
INSTALLED
59”, 24”
226.5 LBS.
N/A
OFT-70
70
6”
¾”
INSTALLED
66”, 26”
356 LBS.
N/A
C. IMPROPER COMBUSTION
D. EXTENDED NON-USE PERIODS
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E. INSULATION BLANKETS
Insulation blankets available for external use on gas water heaters are not approved for use on your HTP
Oil-Fired Water Heater. The purpose of an insulation blanket is to reduce standby heat loss encountered
with storage tank water heaters. Your water heater meets or exceeds the ASHRAE/IES 90.1b standby
heat loss standards, making an insulation blanket unnecessary.
PART 2: SPECIFICATIONS
Table 1
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