HTP OFT-30 User manual

120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
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.

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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.
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.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.

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FOR THE INSTALLER
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.
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
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

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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.
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.
B. CHEMICAL VAPOR CORROSION
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.
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).

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C. IMPROPER COMBUSTION
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.
D. EXTENDED NON-USE PERIODS
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.
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.
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.
PART 2: SPECIFICATIONS
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
Table 1

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PART 3: LOCATING THE HEATER
When installing the heater, consideration must be given to proper location. Locate in an area with
adequate air supply, as close to the stack or chimney and as centralized to the piping system as possible.
This unit must be installed on a non-combustible surface.
There is a risk in using fuel burning appliances, such as oil water heaters, in rooms, garages, or other
areas where gasoline, other flammable liquids, or engine driven equipment or vehicles are stores,
operated, or repaired. Flammable vapors are heavy and travel along the floor. These vapors may be
ignited by the heater ignition system or burner flames, causing fire or explosion.
Some local codes permit operation of oil appliances in these areas if installed 18 inches or more above
the floor. This may reduce the risk of ignition.
In these circumstances, the heater must be located or protected so it is not subject to physical damage by
a moving vehicle.
Flammable items, pressurized containers, or any other potentially hazardous articles must never be
placed on or adjacent to the heater. Open containers of flammable material must be stored or used in the
same room with the heater.
NOTE: The heater must not be located in an area where it will be subject to freezing.
Locate heater near a floor drain, where leakage from the tank or connections will not result in damage to
the adjacent area or to lower floors of the structure.
When such locations cannot be avoided, a suitable metal drain pan, adequately drained, should be
installed under the heater. Such pans should be fabricated with sides at least 2” deep, with length and
width at least 2” greater than the diameter of the heater, and must be piped to a drain. The pan must not
restrict combustion air flow.

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PART 4: INSTALLATION INSTRUCTIONS
Figure 1 –Installation Instructions
NOTE: Diagrams shown with preferred burner dimensions. Other burners may not go with the tank.
PART 5: LEVELING AND CLEARANCES
A. LEVELING
The heater must be installed level. If it is necessary to adjust the heater, use metal shims under the
channel-type skid base.
B. CLEARANCES
Provide ample clearance on all sides for installation, adjustment, and replacement of burner, control
components and other serviceable parts, such as the relief valve, power burner, thermostat, and/or drain
valve.
NOTE: Minimum clearance to combustible construction is: Sides, 6”, Back, 6”, Front, 24”.
NOTE: If a chimney connector is used, the minimum clearance from the top of the unit to the connector is
18”.

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PART 6: AIR REQUIREMENTS
For safe operation, an ample supply of air must be provided for proper combustion and ventilation in
accordance with Section 5.3 of the National Fuel Gas Code, NFPA-54/ANSI Z223.1 or applicable
provisions of local building codes. An insufficient supply of air will result in a yellow, luminous burner
flame, causing sooting of the heat exchanger and creating a risk of asphyxiation.
A. UNCONFINED SPACE
In buildings of conventional frame, brick or stone construction, unconfined spaces may provide adequate
air for combustion.
If the unconfined space is within a building of tight construction (buildings using the following: weather
stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion and ventilation must be
obtained from outdoors or spaces freely communicating with the outdoors. The installation instructions for
confined spaces in tightly constructed buildings must be followed to ensure adequate air supply.
B. CONFINED SPACE
When drawing combustion and dilution air from inside a conventionally constructed building to a confined
space, this space must be provided with two permanent openings, ONE IN OR WITHIN 12 INCHES OF
THE TOP ENCLOSURE AND ONE IN OR WITHIN 12 INCHES OF THE BOTTOM ENCLOSURE. Each
opening shall have a free air area of at least one square inch per 1000 BTU/hr of the total input of all
appliances in the enclosure, but not less than 100 square inches.
If the confined space is within a building of
tight construction, air for combustion,
ventilation and draft dilution must be obtained
from outdoors. When directly venting with the
outdoors or venting with the outdoors through
vertical ducts, two permanent openings,
located in the aforementioned manner, must
be provided. Each opening must have a free
area of not less than one square inch per
4000 Btu/hr of the total input of all appliances
in the enclosure. If horizontal ducts are used,
each opening shall have a free area of not
less than one square inch per 2000 Btu/hr of
the total input of all appliances in the
enclosure.
In the absence of local codes, refer to the
National Fire Protection Standard for Oil
Burning Equipment NFPA No. 31 (latest
edition).
Where an exhaust fan is installed in the same
room with the boiler, sufficient openings for air must be provided in the walls.
UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE
CHIMNEY OR OTHER UNDESIRABLE OPENINGS, CAUSING POOR COMBUSTION. SOOTING MAY
RESULT WITH AN INCREASED RISK OF ASPHYXIATION.
Figure 2 –CO Warning Label

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PART 7: THERMAL EXPANSION (CLOSED SYSTEMS)
Thermal expansion occurs in any hot water system when system water is heated or “recovered” during
periods of non-use.
If the system is operated in an “open” condition, such as being connected directly to the city main, the
volume of expanded water generated during recovery periods can be dissipated back through the “open”
connection to the city main so pressure cannot increase.
However, once a back flow preventer is installed to isolate system water from the public supply, or a
pressure reducing valve is installed to protect a water meter, or any device preventing flow back into the
cold water supply is installed, the “open” condition becomes “closed”. During non-use periods, water
expands and pressure increases until a relief valve opens, releasing hot water.
A relief valve opening on pressure releases small amounts of water. A valve relieving on temperature
releases large amounts of water.
Since water is not compressible, some provision must be made for THERMAL EXPANSION to protect the
system from excessive pressures. HTP recommends installing a properly and adequately sized
expansion tank to meet the expanding volume of water.
Service problems or parts failure due to excessive pressure ARE NOT covered under warranty.
The temperature and pressure relief valve supplied with the water heater IS NOT considered to be
protection against thermal expansion.
Your water supplier or local plumbing inspector should be contacted on how to control thermal expansion.
PART 8: VENTING
The connection from the water heater vent to the stack must be made as direct as possible and of the
same diameter as the vent outlet. The recommended slope of any horizontal breaching is at least 1/2"
rise per linear foot. A barometrically operated draft regulator (barometric damper) shall be installed in the
vent connector at a location just above the water heater.
The stack must extend at least three feet above the highest point of the roof to insure proper venting. The
stack should be provided with a weather cap of approved design.
Provisions shall be made to prevent contact of the vent pipe with combustible materials in accordance
with all codes and regulations.
A separate vent for each appliance is strongly recommended. Separate vents are required for installation
and application of multiple power vents. If combined venting of multiple appliances is necessary, or if an
unusual situation arises, consult the National Fire Protection Standard for Oil Burning Equipment NFPA
No.31, or in Canada CSA B139.