Hubbell DF User Manual
OPERATING AND MAINTENANCE MANUAL FOR
POWER BURNER SERIES FORCED DRAFT
COMMERCIAL WATER HEATER
ELECTRIC HEATER COMPANY
BASE MODEL “ DF ”
HUBBELL ELECTRIC HEATER COMPANY
P.O. BOX 288
STRATFORD, CT 06615
PHONE: (203) 378-2659
FAX: (203) 378-3593
INTERNET: http://www.hubbellhe a t ers.com/
-- IMPORTANT --
Always reference the full model number and serial number when calling the factory.
WARNING / CAUTION
¾ Do not use or store gasoline or any other flammable vapors, liquids, or materials in the
vicinity of this or any other appliance.
¾ Due to the rigors of transportation, all connections should be checked for tightness before heater
is placed in operation.
¾ Safety relief valve must be installed in tapping provided.
¾ KEEP AWAY FROM LIVE ELECTRICAL CIRCUITS.
Do not perform any maintenance, make any adjustments, or replace any components inside the
control panel with the high voltage power supply turned on. Under certain circumstances,
dangerous potentials may exist even when the power supply is off. To avoid casualties, always
turn the power supply safety switch to off, turn the charg e or g round the circuit before
performing any maintenance or adjustment procedure.
¾ Installation and service must be performed by a qualified installer, service agency or the gas
supplier. City, state, and national codes governing installation of commercial water heaters
must be followed and take precedence over recommendations in this manual.
¾ The manufacturer’s warranty on this water heater is in effect only when the water heater is
installed and operated in accordance with these instructions and local codes and ordinances or,
in the absence of local codes and ordinances, the National Fuel Gas Code (the latest ANSI
Z223.1). In Canada, installation should conform to the latest CAN/CGAB149 installation
codes and/or local codes. The manufacturer of this water heater will not be held liable for any
damage from failure to comply with these installation and operating instructions.
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FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
¾ DO NOT try to light any appliance.
¾ DO NOT touch any electrical switch.
¾ DO NOT use any phone in the building.
¾ 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.
¾ WARNING: If these instructions are not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
PRECAUTIONS
TANK LINING - DAMAGE PREVENTION
The water heater lining has been electronically inspected for continuity prior to final assembly. It was
found to be free of defects. In order to protect the lining, do not apply heavy blows or weld to the
exterior pressure vessel. Damage to the inter ior lining will void the wa rr anty and ASME HLW stamp.
TANK MAINTENANCE - REMOVAL OF SEDIMENT AND SCALE
To keep the water heater efficient and in good working condition, inspect and clean two weeks after
installation to remove any piping system debris that may have accumulated. Do not acidize this unit.
Monthly inspections should be performed to determine a time span for removing any sediment
within the unit. This should become the basis for a routine maintenance schedule. It is recommended
that high-pressure water be used to purge any accumulation of sediment through the drain valve
opening or the hand hole.
ANODE MAINTENANCE
The water heating industry knows that many water heaters are installed in areas where the water supply
can be abnormally corrosive due to low pH or an excessive amount of dissolved oxygen. Because of
our commitment to provide clear water in all areas, an anode has been provided to help counteract the
effects of these factors. Periodic inspection and, if necessary, replacement is required to assure the
anodes effectiveness.
WATER QUALITY - pH LEVEL
Materials used in the water heater to prevent corrosion have been selected for their compatibility with
most domestic water supplies. However, significantly alkaline water (pH 7.5 or higher) or acidic water
(pH 6.5 or lower) can result in abnormal scale formation or seriously attack these materials and cause
premature corrosion. If the pH of incoming supply water does not fall between 6.5 and 7.5, it must be
treated to prevent damage to internal water heater surfaces and other building plumbing components.
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SAFETY TEMPERATURE AND PRESSURE RELIEF VALVE (T&P)
A listed and properly rated combination temperature and pressure relief valve shall be installed in the
opening provided and marked for this purpose at the time of installation. Local codes shall govern
installation of relief devices. The pressure rating of the relief valve m ust not exceed the working
pressure shown on the rating plate affix ed to the front of the water heater. The BTU/H rating of the
relief valve must equal or exceed the water heater input shown on the rating plate. The relief valve
discharge line must terminate 6 inches above the floor drain or externally to building. The discharge
line must be able to withstand water temperature in excess of 210°F.
¾ DO NOT install a valve between tank and the relief valve.
¾ DO Install a discharge line directly to an adequate open drain. The discharge line must be
shielded, secured and plumbed to an appropriate drain to prevent scald injury.
¾ DO NOT install a reducing coupling or other restriction in the discharge line.
¾ DO NOT install the discharge line where it may be subject to blocking, plugging or freezing.
¾ DO NOT allow water from discharge line to contact any live electrical part.
Failure to install a listed and properly rated temperature and pressure relief valve could result in
hazard to life, bodily injury or property damage and will release the manufacturer of this water heater
from any claim which might result from excessive water temperature or pressure.
CAUTION
KEEP CLEAR OF DISCHARGE LINE OUTLET. It is hot enough to cause scald injury, is under
pressure and may splash.
IMPORTANT
¾ Periodically check combustion products to assure that carbon monoxide is kept below 0.02%
(200 PPM) or that the CO
¾ Drain the water heater for 5 minutes every day to help prevent accumulation of sediment and
scale. Periodically check for the presence of scale and sediment. If present, physically
loosen and flush using high-pressure water.
¾ All startup, periodic tuning and service must be performed by a trained technician familiar
with the water heater and forced draft burner. It is mandatory that the startup test report,
contained in the burner installation and operation manual, be completed and a copy returned
to the factory. It is also important that an operating log be maintained to provide a history of
water heater performance.
is kept between 9 & 9 ½%.
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TABLE OF CONTENTS
SECTION TITLE PAGE #
I GENERAL DESCRIPTION 9
II INSTALLATION 10
III STA RT UP AND OP ERATION 16
IV SCHEDULED MAINTENANCE AND SERVICING 18
V TROUBLESHOOTING 25
VI MISCELLANEOUS CHARTS AND FORMULAS 26
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SECTION I - GENERAL DESCRIPTION
GENERAL DESCRIPTION
This is a commercial storage water heater designed and constructed in accordance wit h UL and
ASME requirements. Its thermal efficiency and standby loss exceed the levels established by
ASHRAE 90.1 and incorporated by federal EPACT legislation. Given a reasonable amount of
maintenance, this water heating product will perform reliably for many years. Its basic design is well
proven over time, and operating components have been selected for their reliability and widespread
use in the water heating industry. This philosophy also promotes availability of both parts and trained
service personnel. It is essential that all aspects of installation, maintenance, routine servicing,
troubleshooting and repair be planned with safety as the primary consideration. If the installer or
service technician has any questions about this water heater's operation, the factory should be
contacted immediately. It is also very important to properly maintain this water heater to obtain long
life and maintain its high efficiency.
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