Installation
Start-Up
Maintenance
Parts
Phoenix
Light Commercial
Water Heaters
Warranty
PH76* Models
* “LP” Denotes Propane Gas
This manual must only be used by a qualied installer / service technician. Read all instructions in this manual before
installing. Perform steps in the given order. Failure to do so could result in substantial property damage, severe
personal injury, or death.
Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause
property damage, severe personal injury, or death.
HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical
errors in literature.
The surfaces of these products contacted by potable (consumable) water contain less than 0.25% lead by weight as
required by the Safe Drinking Water Act, Section 1417.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
120 Braley Road P.O. Box 429 East Freetown, MA 02717-0429 www.htproducts.com
LP-441 Rev. 3.16.15
2
IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT, CAUSING
PROPERTY DAMAGE, PERSONAL INJURY, OR LOSS OF LIFE. DO NOT STORE 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 re department. Installation and service must be provided by a qualied
installer, service agency, or the gas supplier.
LP-441 Rev. 3.16.15
The following dened 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 serious personal injury or
death.
WARNING indicates a potentially hazardous situation
which, if not avoided, could result in personal injury or death.
CAUTION indicates a potentially hazardous situation which,
if not avoided, may result in moderate or minor personal
injury.
CAUTION used without the safety alert symbol indicates
a potentially hazardous situation which, if not avoided, may
result in property damage.
NOTICE is used to address practices not related to personal
injury.
Foreword
This manual is intended to be used in conjunction with other
literature provided with the water heater. This includes
all related control information. It is important that this
manual, all other documents included in this system, and
additional publications including the Code for the Installation
of Heat Producing Appliances and National Fuel Gas Code ANSI Z223.1 (latest
versions), be reviewed
in their entirety before
beginning any work.
Installation should be
made in accordance
with the regulations
of the Authority
Having Jurisdiction,
local code authorities,
and utility companies
which pertain to this
type of water heating
equipment.
Authority Having
Jurisdiction (AHJ) – The
AHJ may be a federal,
state, local government,
or individual such
as a re chief, re
marshal, chief of a re
prevention bureau,
labor department or
health department,
building ocial or
3
electrical inspector, or others having statutory authority. In some
circumstances, the property owner or his/her agent assumes the
role, and at government installations, the commanding ocer
or departmental ocial may be the AHJ.
NOTE: HTP, Inc. reserves the right to modify product technical
specications and components without prior notice.
For the Installer
This water heater must be installed by qualied and licensed
personnel. The installer should be guided by the instructions
furnished with the water heater, and by local codes and
utility company requirements. In the absence of local codes,
preference should be given to the National Fuel Gas Code - ANSI
Z223.1, latest version.
Installations Must Comply With:
Local, state, provincial, and national codes, laws, regulations,
and ordinances.
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. Also, Canadian Electrical Code, C 22.1, from
Canadian Standards Association, 5060 Spectrum Way, Suite
100, Mississauga, Ontario, Canada L4W 5N6.
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.
NOTE: The gas manifold and controls met safe lighting and
other performance criteria when undergoing tests specied in
ANSI Z21.10.3 - latest edition.
LP-441 Rev. 3.16.15
4
Table of Contents
Part 1 - General Safety Information 4
A. Improper Combustion 5
B. Gas 5
C. When Servicing the Water Heating System 5
D. Heater Water 5
E. Freeze Protection 5
F. Water Temperature Adjustment 5
Part 2 - Before You Start 6
A. What’s in the Box 6
B. How the Heater Operates 6
C. Optional Equipment 6
Part 3 - Prepare the Water Heater 6
A. Locating the Water Heater 7
B. Leveling 7
C. Clearances for Service Access 8
D. Residential Garage Installation 8
E. Exhaust Vent and Intake Pipe 8
1. Direct Vent of Exhaust and Intake 8
2. Indoor Combustion Air in Conned or Unconned Space 9
F. Prevent Combustion Air Contamination 9
G. Removing a Heater from a Common Vent System 9
H. Water Chemistry Requirements 10
Part 4 - Piping 11
A. Heater Plumbing 12
B. Auxiliary Connections 12
C. Backow Preventer 12
D. Potable Expansion Tank 12
E. Temperature and Pressure Relief Valve 12
F. Scalding 13
G. Filling the Heater 13
H. Applications 14
Part 5 - Venting and Condensate Removal 16
A. General 16
B. Approved Materials for Exhaust Vent and Intake Pipe 17
C. Additional Requirements for Installation in Canada 17
D. Exhaust Vent and Intake Pipe Location 18
E. Exhaust Vent and Intake Pipe Sizing 18
F. Longer Vent Runs 19
G. Exhaust Vent and Intake Pipe Installation 19
H. Applications 20
1. Direct Vent Installation of Exhaust and Intake 20
2. Venting Through an Existing System 21
3. Indoor Combustion Air in Conned or Unconned Space 22
I. Condensate Removal System 23
Part 6 - Wiring 25
A. Line Voltage Input 25
B. Line Voltage Condensate Input 25
C. Low Voltage Outdoor Sensor Input 25
D. Internal Wiring Diagram 26
Part 7 - Gas Connections 26
A. Gas Piping 27
B. Gas Table 27
C. Gas Valve 28
Part 8 - Controls 28
A. Control and Display Overview 28
B. Basic Control Functions 29
1. Turning the Water Heater On / O 29
2. Resetting the Water Heater 29
3. Putting the Water Heater in ECO Mode 29
4. Changing User Setpoint 29
C. Advanced Control Functions 30
1. Upper Level Control Functions 30
2. Technical Service and Navigation 30
D. Outdoor Reset 31
1. Inquiry Mode and Navigation 31
2. History Mode and Navigation 31
3. Reset Mode and Navigation 32
Part 9 - Start-Up Procedure 32
A. Operating Instructions 32
B. Test Mode 32
C. Maintenance 33
Part 10 - Shutdown 33
A. Shutdown Procedure 33
B. Vacation Procedure 33
C. Failure to Operate 33
D. Important Notice 34
Part 11 - Troubleshooting 34
A. Error Code 34
B. Heater Error 34
C. Lockout 34
Part 12 - Installation Checklist 38
Part 13 - Maintenance 39
Limited Warranty 44
Maintenance Notes 46
Customer Installation Record Form 47
Part 1 - General Safety Information
This water heater is approved for indoor installations only
and is not intended for use as a pool heater. Clearance to
combustible materials: 0” top, bottom, sides, and back.
Heater must have room for service: 24” front, 3” left and
right sides, 6” top, and 0” back are minimum recommended
service clearances. (A combustible door or removable panel
is acceptable front clearance.) This water heater has been
approved for closet installation and installation on combustible
ooring. Do not install directly on carpeting. Install the water
heater in a location where temperature and pressure relief
valve discharge or a leak will not result in damage to the
surrounding area. If such a location is not available, install an
auxiliary catch pan. Use only Category IV vent systems.
Installer - Read all instructions in this manual before installing.
Perform steps in the given order.
User - This manual is for use only by a qualied heating
installer / service technician. Have this water heater serviced /
inspected annually by a qualied service technician.
FAILURE TO ADHERE TO THE GUIDELINES ON THIS PAGE
CAN RESULT IN SUBSTANTIAL PROPERTY DAMAGE,
SEVERE PERSONAL INJURY, OR DEATH.
NOTE: If the water heater is exposed to the following, do not
operate. Immediately call a qualied service technician.
1. Fire
2. Damage
3. Water
Failure to follow this information could result in property
damage, severe personal injury, or death.
LP-441 Rev. 3.16.15
DO NOT USE THIS WATER HEATER IF ANY PART HAS
BEEN SUBMERGED IN WATER. Immediately call a qualied
service technician. The water heater MUST BE replaced if it
has been submerged. Attempting to operate a water heater
that has been submerged could create numerous harmful
conditions, such as a potential gas leakage causing a re
and/or explosion, or the release of mold, bacteria, or other
harmful particulates into the air. Operating a previously
submerged water heater could result in property damage,
severe personal injury, or death.
NOTE: Water heater damage due to ood or submersion is
considered an Act of God, and IS NOT covered under product
warranty.
NOTE: Obey all local codes. Obtain all applicable permits
before installing the water heater.
NOTE: Install all system components and piping in such a
manner that does not reduce the performance of any re
rated assembly.
Altering any HTP, Inc. water heater with parts not
manufactured by HTP, Inc. WILL INSTANTLY VOID the
water heater warranty and could result in property damage,
personal injury, or death.
This water heater has been designed to heat potable water
ONLY. Using this water heater to heat non-potable uid WILL
VOID product warranty, and could result in property damage,
personal injury, or death.
5
C. When Servicing the Water Heating System
Be sure to disconnect electrical power before performing
service. Failure to do so could result in electrical shock, property
damage, serious personal injury, or death.
To avoid electric shock, disconnect electrical supply before
performing maintenance.
NOTE: When inquiring about service or troubleshooting,
reference the model and serial numbers from the water heater
rating label.
To avoid severe burns, allow water heater and associated
equipment to cool before servicing.
D. Heater Water
Do not use petroleum-based cleaning or sealing compounds in
a water heating system. Gaskets and seals in the system may be
damaged. This can result in substantial property damage.
Do not use “homemade cures” or “patent medicines”. Damage
to the water heater, substantial property damage, and/or
serious personal injury may result.
E. Freeze Protection
NOTE: Consider piping and installation when determining
heater location.
Failure of the water heater due to freeze related damage IS
NOT covered by product warranty.
Do not use this water heater for anything other than its
intended purpose (as described in this manual). Doing so
could result in property damage and WILL VOID product
warranty.
High heat sources (sources generating heat 100oF / 37oC or
greater, such as stove pipes, space heaters, etc.) may damage
plastic components of the water heater as well as plastic
vent pipe materials. Such damages ARE NOT covered by
warranty. It is recommended to keep a minimum clearance of
8” from high heat sources. Observe heat source manufacturer
instructions, as well as local, state, provincial, and national
codes, laws, regulations and ordinances when installing this
water heater and related components near high heat sources.
A. Improper Combustion
Do not obstruct the ow of combustion and ventilating air.
Adequate air is necessary for safe operation. Failure to keep
the exhaust vent and combustion air intake clear of ice, snow,
or other debris could result in property damage, serious
personal injury, or death.
B. Gas
Should overheating or gas supply fail to shut o, turn o the
manual gas control valve to the water heater.
NEVER use any toxic chemical, including automotive, standard
glycol antifreeze, or ethylene glycol made for hydronic (nonpotable) systems. These chemicals can attack gaskets and seals
in water systems, are poisonous if consumed, and can cause
personal injury or death.
UNCRATING THE WATER HEATER - Any claims for damage
or shortage in shipment must be led immediately against the
transportation company by the consignee.
F. Water Temperature Adjustment
If the water heater is going to have a set temperature above
120oF, you must use an ASSE 1017 rated mixing valve to avoid
severe burns or death from scalding temperatures.
Households with small children, disabled, or elderly persons
may require a 120oF or lower temperature setting to prevent
severe personal injury or death due to scalding.
LP-441 Rev. 3.16.15
6
Approximate Time / Temperature Relationships in Scalds
120oF More than 5 minutes
125oF 1 1/2 to 2 minutes
130oF About 30 seconds
135oF About 10 seconds
140oF Less than 5 seconds
145oF Less than 3 seconds
150oF About 1 1/2 seconds
155oF About 1 second
Table 1 - Approximate Time / Temperature Relationships in Scalds
Part 2 - Before You Start
Remove all sides of the shipping crate of the water heater.
A. What’s in the Box
Components included with the water heater:
• Intake PVC Tee with Screens
• Exhaust PVC Coupling with Screens
• Temperature and Pressure Relief Valve (Ships Installed)
• High Output Cold Water Dip Tube
• Installation Manual and Warranty
• User’s Information Manual
B. How the Heater Operates
Modulating Condensing Technology is an intelligent system
that delivers highly ecient water heating, maximizing
eciency by measuring the data parameters of your water
heating system. Some of its features are:
Stainless Steel Water Storage Tank
The stainless steel water storage tank has a combustion
chamber submerged into the tank water. When the water heater
is red, combustion gases heat the combustion chamber walls,
transferring heat directly into the surrounding water. These hot
gases are blown into secondary heat exchanger coils, where
more heat from these gases is transferred into the water.
Modulating Combustion System
The control monitors the water heating system and
temperatures, regulating burner output during operation to
match system demand. This increase in eciency allows for
substantial fuel savings.
High Output Cold Water Dip Tube
(Optional - Shipped with Heater)
When installed, the High Output Cold Water Dip Tube increases
hot water draw and recovery time by 20% and decreases thermal
eciency by a small amount.
Gas Valve
The gas valve senses suction from the blower, allowing gas to
ow only if the gas valve is energized and combustion air is
owing.
Tank Sensor
This sensor monitors system water temperature. The control
module adjusts burner ring rate so the outlet water temperature
meets the set point.
Control
The integrated control system monitors water temperature and
adjusts fan speed to regulate the heater’s energy output. This
allows the unit to deliver the required amount of heated energy
and nothing more.
Burner
Constructed of high grade stainless steel, the burner uses premixed air and gas and provides a wide range of ring rates.
Condensate System with Built-In Neutralizing Cartridge
This is a condensing high eciency water heater with a
condensate removal system. Condensate is nothing more
than water vapor derived from combustion products, similar
to that of an automobile when it is initially started. It is very
important that the condensate line slopes away from the
water heater and down to a suitable inside drain.
The Built-In Neutralizing Cartridge is lled with marble chips
that neutralize the condensate before it ows into a local
drain. The marble chips dissolve over time. The cartridge is
designed to be easily removed, relled with marble chips, and
reinstalled.
If the condensate outlet on the heater is lower than the drain,
us a condensate removal pump (Part # 554200, available from
HTP). In addition, local authorities may require an additional
condensate neutralizer to neutralize the condensate.
It is also very important not to expose the condensate line to
freezing temperatures or any type of blockage. Plastic tubing
must be the only material used for the condensate line. Steel,
brass, copper, or other materials will be subject to corrosion
or deterioration. A second vent may be necessary to prevent
condensate line vacuum lock on a long horizontal run. Also,
an increase in pipe size may be necessary to allow condensate
to drain properly. Support of the condensate line may be
necessary to avoid blockage of the condensate ow.
Spark Ignition
The burner ame is ignited by applying high voltage to the
system spark electrode. This causes a spark from electrode to
ground.
C. Optional Equipment
Optional equipment available from HTP (and Part #):
• 3” Stainless Steel Outside Vent Termination Kit (V1000)
• 2” PVC Concentric Vent Kit (KGAVT0501CVT)
• 3” PVC Concentric Vent Kit (KGAVT0601CVT)
• 3” Polypro Vent Kit (8400P-001)
• 3” Polypro Pipe
(33’ length # 8400P-002, 49.5’ length # 8400P-003)
• Outdoor Sensor (7250P-319)
• Condensate Neutralizer Replacement (7700P-026)
Part 3 - Prepare the Water Heater
Remove all sides of the shipping crate to allow the heater to
be moved into its installation location.
COLD WEATHER HANDLING - If the water heater has
been stored in a very cold location (BELOW 0oF) before
installation, handle with care until the components come to
room temperature. Failure to do so could result in damage to
the water heater.
Carefully consider installation when determining heater
location. Please read the entire manual before attempting
installation. Failure to properly take factors such as heater
venting, piping, condensate removal, and wiring into account
before installation could result in wasted time, money, and
possible property damage and personal injury.
LP-441 Rev. 3.16.15
A. Locating the Water Heater
This water heater is certied for indoor use only. DO NOT
INSTALL OUTDOORS. Outdoor installations ARE NOT
covered by warranty. Failure to install the water heater
indoors could result in property damage, severe personal
injury, or death.
Incorrect ambient conditions can lead to damage to the
heating system and put safe operation at risk. Ensure that
the installation location adheres to the information included
in this manual. Failure to do so could result in property
damage, serious personal injury, or death. Failure of heater
or components due to incorrect operating conditions IS NOT
covered by product warranty.
1. Installation Area (Mechanical Room) Operating Conditions
• Ensure ambient temperatures are higher than 32oF /
0oC and lower than 104oF / 40oC
• Prevent the air from becoming contaminated by the
products, places, and conditions listed in this manual
• Avoid continuously high levels of humidity
• Never close existing ventilation openings
• Ensure a minimum 1” clearance around hot water and
exhaust vent pipes
• NOTE: To prevent condensing in the fan, it is
recommended to avoid prolonged exposure to
temperatures below 45oF
This water heater has a condensate disposal system that
may freeze if exposed to sustained temperatures below 32oF.
Precautions should be taken to protect the condensate trap
and drain lines from sustained freezing conditions. Failure
to take precautions could result in property damage, severe
personal injury, or death.
2. Check for nearby connections to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
• Condensate drain
3. Check area around heater. Remove any combustible
materials, gasoline, and other ammable liquids.
Failure to keep the water heater area clear and free of
combustible materials, liquids, and vapors can result in
substantial property damage, severe personal injury, or
death.
7
The service life of the water heater’s exposed metallic surfaces,
such as the casing, as well as internal surfaces, such as the heat
exchanger, are directly inuenced by proximity to damp and
salty marine environments. In such areas higher concentration
levels of chlorides from sea spray coupled with relative humidity
can lead to degradation of water heater components. In these
environments, heaters must not be installed using direct vent
systems which draw outdoor air for combustion. Such heaters
must be installed using room air for combustion. Indoor air
will have a much lower relative humidity, and hence potential
corrosion will be minimized.
High heat sources (generating heat 100oF / 37oC or greater,
such as boiler ue pipes, space heaters, etc.) may damage
plastic components of the water heater as well as plastic vent
pipe materials. Such damages ARE NOT covered by warranty. It
is recommended to keep a minimum clearance of 8” from high
heat sources. Observe heat source manufacturer instructions,
as well as local, state, provincial, and national codes, laws,
regulations, and ordinances when installing this water heater
and related components near high heat sources.
Locate the water heater where any leakage from the relief valve,
related piping, tank, or connections will not result in damage
to surrounding areas or lower oors of the building. The water
heater should be located near a oor drain or installed in a drain
pan. Leakage damages ARE NOT covered by warranty.
Failure of the water heater or components due to incorrect
operating conditions IS NOT covered by product warranty.
4. Gas control system components must be protected from
dripping water during operation and service.
5. If the heater is to replace an existing heater, check for and
correct any existing system problems, such as:
• System leaks
• Location that could cause the system and heater to
freeze and leak
• Incorrectly sized expansion tank
6. Clean and ush system when reinstalling a heater.
NOTE: When installing in a zero clearance location, it may
not be possible to read or view some product labeling. It is
recommended to make note of the heater model and serial
number.
B. Leveling
In order for the condensate to properly ow out of the collection
system, the area where you locate the heater must be level.
Location must also fully support the weight of the lled water
heater.
LP-441 Rev. 3.16.15
8
C. Clearances for Service Access
All water heaters eventually leak. It is recommended to install
a catch pan beneath the water heater. This catch pan should be
sized with a maximum depth of 2”, and a minimum diameter 2”
greater than the diameter of the water heater. The catch pan
should empty into an open drain line. This drain line should be
3/4” ID minimum, piped to an open drain. Failure to follow these
instructions could result in property damage. Such damages
ARE NOT covered by product warranty.
D. Residential Garage Installation
Precautions
If the heater is located in a residential garage, per ANSI Z223.1:
• Install the water heater burner and ignition devices a
minimum of 18” above the oor of the garage. This will
ensure the burner and ignition devices are well o the
oor.
• When raising the water heater ensure the entire
bottom and fully lled weight of the water heater are
fully supported.
• Locate or protect the water heater so it cannot be
damaged by a moving vehicle.
E. Exhaust Vent and Intake Pipe
The heater is rated ANSI Z21.10.3 Category IV (pressurized
vent, likely to form condensate in the vent) and requires a
special vent system designed for pressurized venting.
NOTE: The venting options described here (and further
detailed in the Venting section, this manual) are the lone
venting options approved for this water heater. Failure
to vent the water heater in accordance with the provided
venting instructions will void the warranty.
Failure to vent the water heater properly will result in serious
personal injury or death.
Figure 1 - Catch Pan Dimensions and Recommended Service
Clearances
NOTE: In addition, it is recommended to provide a minimum
service clearance of 6” from the top of the water heater to allow
for piping of the T&P relief valve and top ports. Depending on
the installation, this clearance may need to be substantially
greater than 6”.
NOTE: If you do not provide the minimum clearances shown in
Figure 1 it might not be possible to service the heater without
removing it from the space.
The space must be provided with combustion / ventilation air
openings correctly sized for all other appliances located in the
same space as the heater. The heater cover must be securely
fastened to prevent the heater from drawing air from the
heater room. This is particularly important if the heater is in a
room with other appliances. Failure to comply with the above
warnings could result in substantial property damage, severe
personal injury, or death.
Do not attempt to vent this water heater by any means other
than those described in this manual. Doing so will void the
warranty and may result in severe personal injury or death.
Vents must be properly supported. Heater exhaust and
intake connections are not designed to carry heavy weight.
Vent support brackets must be within 1’ of the heater and
the balance at 4’ intervals. Heater must be readily accessible
for visual inspection for rst 3’ from the water heater. Failure
to properly support vents could result in property damage,
severe personal injury, or death.
The exhaust discharged by this water heater may be very hot.
Avoid touching or other direct contact with the exhaust gases
of the vent termination assembly. Doing so could result in
severe personal injury or death.
1. Direct Vent of Exhaust and Intake
If installing a direct vent option, combustion air must be drawn
from the outdoors directly into the water heater intake and
exhaust must terminate outdoors. There are three basic direct
vent options detailed in this manual: 1. Side Wall Venting, 2.
Roof Venting, and 3. Unbalanced Venting.
Be sure to locate the heater such that the exhaust vent and
intake piping can be routed through the building and properly
terminated. Dierent vent terminals can be used to simplify
and eliminate multiple penetrations in the building structure
(see Optional Equipment in Venting Section). The exhaust
vent and intake piping lengths, routing, and termination
methods must all comply with the methods and limits given
in the Venting Section, this manual.
When installing a combustion air intake from outdoors, care
must be taken to utilize uncontaminated combustion air. To
prevent combustion air contamination, see Table 2.
LP-441 Rev. 3.16.15
9
2. Indoor Combustion Air in Conned or Unconned Space
This heater requires fresh, uncontaminated air for safe
operation and must be installed in a mechanical room where
there is adequate combustion and ventilating air. NOTE: To
prevent combustion air contamination, see Table 2.
Combustion air from the indoor space can be used if the space
has adequate area or when air is provided through a duct or
louver to supply sucient combustion air based on the water
heater input. Never obstruct the supply of combustion air to
the water heater. If the water heater is installed in areas where
indoor air is contaminated (see Table 2) it is imperative that the
water heater be installed as direct vent so that all combustion
air is taken directly from the outdoors into the water heater
intake connection.
Unconned space is space with volume greater than 50
cubic feet per 1,000 BTU/hr (4.8 cubic meters per kW) of the
total input rating of all fuel-burning appliances installed in
that space. Rooms connected directly to this space through
openings not furnished with doors are considered part of the
space. See Venting Section for details.
Conned space is space with volume less than 50 cubic feet
per 1,000 BTU/hr (4.8 cubic meters per kW) of the total input
rating of all fuel-burning appliances installed in that space.
Rooms connected directly to this space through openings not
furnished with doors are considered part of the space.
When drawing combustion air from inside a conventionally
constructed building to a conned space, such space should
be provided with two permanent openings: one located 6”
(15cm) below the space ceiling, the other 6” (15cm) above
the space oor. Each opening should have a free area of one
square inch per 1,000 BTU/hr (22cm2/kW) of the total input of
all appliances in the space, but not less than 100 square inches
(645cm2).
If the conned space is within a building of tight construction,
air for combustion must be obtained from the outdoors as
outlined in the Venting section of this manual.
Products to Avoid
Spray cans containing
uorocarbons
Permanent wave solutions Swimming pools
Chlorinated waxes / cleaners Metal fabrication plants
Chlorine-based swimming pool
chemicals
Calcium chloride used for thawing Refrigeration repair shops
Sodium chloride used for water
softening
Refrigerant leaks Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric or Muriatic acid
Cements and glues New building construction
Antistatic fabric softeners used in
clothes dryers
Chlorine-type bleaches, laundry
detergents, and cleaning solvents
Adhesives used to fasten building
products
Table 2 - Products and Areas Likely to Have Contaminants
Areas Likely to Have
Contaminants
Dry cleaning / laundry areas and
establishments
Beauty shops
Photo processing plants
Furniture renishing areas and
establishments
Remodeling areas
Garages and workshops
NOTE: DAMAGE TO THE HEATER CAUSED BY EXPOSURE
TO CORROSIVE VAPORS IS NOT COVERED BY WARRANTY.
(Refer to the limited warranty for complete terms and
conditions.)
G. Removing a Heater from a Common Vent System
Do not install the heater into a common vent with any other
appliance. This will cause ue gas spillage or appliance
malfunction, resulting in possible substantial property damage,
severe personal injury, or death.
When drawing combustion air from the outside into the
mechanical room, care must be taken to provide adequate
freeze protection.
Failure to provide an adequate supply of fresh combustion
air can cause poisonous ue gases to enter the living space,
resulting in severe personal injury or death. To prevent
combustion air contamination, see Table 2.
F. Prevent Combustion Air Contamination
Install intake air piping for the heater as described in the
Venting Section, this manual. Do not terminate exhaust in
locations that can allow contamination of intake air.
Ensure that the intake air will not contain any of the
contaminants in Table 2. Contaminated air will damage the
heater, resulting in possible substantial property damage,
severe personal injury, or death. For example, do not pipe
intake air near a swimming pool or laundry facilities. These
areas always contain contaminants.
Failure to follow all instructions can result in ue gas spillage
and carbon monoxide emissions, causing severe personal injury
or death.
When removing an existing heater, follow the steps below.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch to determine if there is blockage, leakage,
corrosion, or other deciencies that could cause an unsafe
condition.
3. If practical, close all building doors, windows, and doors
between the space in which the water heater remains connected
to the common venting system and other spaces in the building.
Turn on clothes dryers and any appliances not connected to
the common venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, at maximum speed. Do
not operate a summer exhaust fan. Close all replace dampers.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust the thermostat so the appliance will
operate continuously.
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the ame of a match or
LP-441 Rev. 3.16.15
10
candle or smoke from a cigarette.
6. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined, return doors, windows, exhaust fans,
replace dampers, and any other gas burning appliances to their
previous condition of use.
7. Any improper operation of the common venting system
should be corrected to conform to the National Fuel Gas Code,
ANSI Z223.1. When resizing any portion of the common venting
system, the system should approach the minimum size as
determined using the appropriate tables in Appendix G of ANSI
Z223.1.
Figure 2 - CO Warning Label
H. Water Chemistry Requirements
Chemical imbalance of the water supply may aect eciency
and cause severe damage to the water heater and associated
equipment. HTP recommends having water quality
professionally analyzed to determine whether it is necessary to
install a water softener. It is important that the water chemistry
on both the domestic hot water and central heating sides are
checked before installing the water heater, as water quality
will aect the reliability of the system. In addition, operating
temperatures above 135oF will further accelerate the build-up of
lime scale and may shorten the service life of the water heater.
Failure of a water heater due to lime scale build-up, low pH, or
other chemical imbalance IS NOT covered by the warranty.
Outlined below are water quality parameters that need to be
met in order for the system to operate eciently for many years.
Water Hardness
Water hardness is mainly due to the presence of calcium and
magnesium salts dissolved in water. The concentration of
these salts is expressed in mg/L, ppm, or grains per gallon
as a measure of relative water hardness. Grains per gallon is
the common reference used in the US water heater industry.
Hardness expressed as mg/L or ppm may be divided by 17.1 to
convert to grains per gallon. Water may be classied as very soft,
slightly hard, moderately hard, or hard based on its hardness
number. The minerals in the water precipitate out as the water
is heated and cause accelerated lime scale accumulation on
a heat transfer surface. This lime scale build-up may result in
premature failure of the water heater. Operating temperatures
above 135oF will further accelerate the build-up of lime scale
and may shorten the service life of the water heater.
Water that is classied as hard and very hard must be softened
to avoid water heater failure.
CLASSIFICATION MG/L OR PPM GRAINS/GAL
Soft 0 - 17.1 0 - 1
Slightly Hard 17.1 - 60 1 - 3.5
Moderately Hard 60 - 120 3.5 - 7
Hard 120 - 180 7 - 10.5
Very Hard 180 and over 10.5 and over
If the hardness of the water exceeds the maximum level of 7
grains per gallon, the water should be softened to a hardness
level no lower than 5 grains per gallon. Water softened as low
as 0 to 1 grain per gallon may be under-saturated with respect
to calcium carbonate, resulting in water that is aggressive and
corrosive.
pH of Water
pH is a measure of relative acidity, neutrality, or alkalinity.
Dissolved minerals and gases aect water pH. The pH scale
ranges from 0 to 14. Water with a pH of 7 is considered neutral.
Water with pH lower than 7 is considered acidic. Water with a
pH higher than 7 is considered alkaline. A neutral pH (around
7) is desirable for most potable water applications. Corrosion
damage and tank failures resulting from water pH levels
of lower than 6 or higher than 8 ARE NOT covered by
warranty. The ideal pH range for water used in a water heater
is 7.2 to 7.8.
Total Dissolved Solids
Total Dissolved Solids (TDS) is a measurement of all minerals
and solids dissolved in a water sample. The concentration of
TDS is usually expressed in parts per million (ppm).
Water with a high TDS concentration will greatly accelerate
lime and scale formation in the hot water system. Most high
TDS concentrations precipitate out of the water when heated.
This can generate a scale accumulation that will greatly reduce
the service life of the water heater.
The manufacturer of the water heater has no control over
water quality, especially TDS levels in your system. TDS in
excess of 2000 ppm will accelerate lime and scale formation
on the element or the heat exchanger. Water heater failure
due to TDS in excess of 2000 ppm IS NOT covered by warranty.
Failure of a water heater due to lime scale build-up IS NOT
covered by warranty.
Hardness: 7 grains
Chloride levels: 100 ppm
pH levels: 6 - 8
TDS: 2000 ppm
Sodium: 20 mG/L
LP-441 Rev. 3.16.15
11
Figure 3 - Water Heater Dimensions - NOTE: All Dimensions Are Approximate
Performance Specications for Phoenix Light Duty Models
BTU/Hr Eciency
76,000 97%
Table 3 - Recovery on Rating Plate is based at 97% Thermal Eciency at 70o Fahrenheit rise, as required by ANSI
(°F) 40 50 60 70 80 90 100 110 120 130 140
(°C) 22 28 33 39 44 50 56 61 67 72 78
GPH 231 187 158 135 119 107 97 86 79 73 69
LPH 874 708 598 511 450 405 367 326 299 276 261
Part 4 - Piping
Failure to follow the instructions in this section WILL VOID the
warranty and may result in property damage, severe personal
injury, or death.
Temperature Rise in Degrees Fahrenheit (F) and Celsius (C)
Dielectric unions or galvanized steel ttings must not be used
in a system with this water heater. Doing so WILL VOID the
warranty. Use only copper, brass, or stainless steel ttings.
Teon thread sealant must be used on all connections.
DO NOT pipe this water heater with black iron, galvanized steel,
steel, or lead pipe. Doing so will result in premature product
failure and property damage, and WILL VOID the warranty.
LP-441 Rev. 3.16.15
12
supply line per local codes.
Do not apply heat to the Hot or Cold water heater connections. If
sweat connections are used, sweat tubing to the adapter before
tting adapter to the water connections on the heater. Any
heat applied to the water heater connections will permanently
damage the dip tube and/or heat traps. Damages due to
improper installation practices ARE NOT covered by warranty.
A. Heater Plumbing
Use two wrenches when tightening water piping at heater. Use
one wrench to prevent the heater return or supply line from
turning. Failure to prevent piping connections from turning
could cause damage to heater components.
The heater control module uses temperature sensors to provide
both high limit protection and modulating temperature control.
The control module also provides low water protection by
sensing the water level in the tank. Some codes / jurisdictions
may require additional external controls.
Installing the Optional High Output Cold Water Dip Tube - For
longer hot water draw, remove the factory installed dip tube
from the cold water inlet and replace with the Optional High
Output Cold Water Dip Tube. This can be done by hand.
The domestic water connections must be installed in accordance
to all local and national plumbing codes, or any applicable
standard which prevails. The inlet (cold) and outlet (hot) ports
are 3/4” on all models.
It is recommended to install a sweat shut-o valve and a union
in the cold inlet piping and hot outlet to ease future servicing. If
there is a backow preventer or any type of a no return valve in
the system, install an additional tee here, suitable for a potable
hot water expansion tank.
In the hot outlet, install a suitable adapter to match the copper
tubing of the plumbing system. A thermal trap or heat trap loop
may be installed here to provide additional energy savings and
prevent the thermal siphoning of domestic hot water.
B. Auxiliary Connections
The auxiliary connections are additional connections for a
recirculation connection, air handlers, plate exchangers, or
other devices that supply hot water. These connections must be
installed in accordance with all local and national codes or any
applicable standard that prevails. Auxiliary connections are 3/4”
on all models. Never use dielectric unions or galvanized steel
ttings. Use only copper or brass ttings. Sealant must be used
on all connections.
Never connect auxiliary connections to any system that uses
glycol or other solutions formulated for hydronic systems.
These auxiliary connections are to be used only in a potable
water system. Failure to follow this warning could result in
serious injury or death.
C. Backow Preventer
Use a backow preventer specically designed for water heater
installations. This valve should be installed on the cold water ll
D. Potable Expansion Tank
A potable hot water expansion tank is required to oset
heated water expansion. In most city plumbing systems, the
water meter has a no return or back ow device built into
the system to prevent back owing of water into city mains.
Some local codes require back ow preventers on all incoming
water supplies. The hot water expansion tank must be listed
for potable water use. The expansion tank should be located
on the cold inlet piping close to the water heater.
Expansion Tank and Make-Up Water
1. Ensure that the expansion tank is sized to correctly handle
heater and system water volume and temperature.
Undersized expansion tanks cause system water to be lost
from the relief valve, causing make-up water to be added.
Eventual heater failure can result due to excessive makeup water addition. SUCH FAILURE IS NOT COVERED BY
WARRANTY.
The expansion tank must be suitable for hot potable water
systems.
2. The expansion tank must be located as shown in
Applications, this manual, or following recognized design
methods. See expansion tank manufacturer’s instructions for
details.
E. Temperature and Pressure Relief Valve
Overheated water and high pressures can cause water tank
explosion. A properly sized temperature and pressure relief
valve must be installed in the opening provided on the water
heater. Failure to install a properly sized temperature and
pressure relief valve could result in explosion and property
damage, serious injury, or death.
To avoid water damage or scalding due to relief valve
operation:
• Discharge line must be connected to relief valve outlet
and run to a safe place of disposal. Terminate the
discharge line in a manner that will prevent possibility
of severe burns or property damage should the relief
valve discharge.
• Discharge line must be as short as possible and
the same size as the valve discharge connection
throughout its entire length.
• Discharge line must pitch downward from the valve
and terminate at least 6” above the oor drain, making
discharge clearly visible.
• The discharge line shall terminate plain, not threaded,
with a material serviceable for temperatures of 375oF
or greater.
• Do not pipe discharge to any location where freezing
could occur.
• No valve may be installed between the relief valve and
heater or in the discharge line. Do not plug or place
any obstruction in the discharge line.
• Test the operation of the relief valve after lling and
pressurizing the system by lifting the lever. Make sure
the valve discharges freely. If the valve fails to operate
LP-441 Rev. 3.16.15
13
correctly, immediately replace with a new properly
rated relief valve.
• Test T&P valve at least once annually to ensure the
waterway is clear. If valve does not operate, turn the
heater “o” and call a plumber immediately.
• Take care whenever operating relief valve to avoid
scalding injury or property damage.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES
COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY
DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
Do not thread a cap or plug into the relief valve or relief
valve line under any circumstances! Explosion and property
damage, serious injury, or death may result.
RE-INSPECTION OF T&P RELIEF VALVES: T&P valves
should be inspected AT LEAST ONCE EVERY THREE
YEARS, and replaced if necessary, by a licensed plumbing
contractor or qualied service technician to ensure that the
product has not been aected by corrosive water conditions
and to ensure that the valve and discharge line have not been
altered or tampered with illegally. Certain naturally occuring
conditions may corrode the valve and its components over
time, rendering the valve inoperative. Such conditions can
only be detected if the valve and its components are physically
removed and inspected. Do not attempt to conduct an
inspection on your own. Contact your plumbing contractor
for a re-inspection to assure continued safety.
FAILURE TO RE-INSPECT THE T&P VALVE AS DIRECTED
COULD RESULT IN UNSAFE TEMPERATURE AND/OR
PRESSURE BUILD-UP WHICH CAN RESULT IN PROPERTY
DAMAGE, SERIOUS PERSONAL INJURY, OR DEATH.
time with regard to scald injury and may be used as a guide in
determining the safest water temperature for your applications.
An ASSE 1017 or ASSE 1070 temperature limiting or mixing
valve is recommended in installations servicing disabled or
elderly persons, or children. Mixing valves do not eliminate the
risk of scalding.
To avoid scalding:
• Set the water heater set point temperature as low as
possible.
• Feel water before bathing or showering.
• If thermostatic valves are required, use devices
specically designed for such purpose. Install these
devices in accordance with instructions provided by the
manufacturer.
Failure to install a temperature limiting or mixing valve and
follow these instructions could result in property damage,
severe personal injury, or death due to scalds.
Approximate Time / Temperature Relationships in Scalds
120oF More than 5 minutes
125oF 1 1/2 to 2 minutes
130oF About 30 seconds
135oF About 10 seconds
140oF Less than 5 seconds
145oF Less than 3 seconds
150oF About 1 1/2 seconds
155oF About 1 second
Table 4 - Approximate Time / Temperature Relationships in Scalds
G. Filling the Heater
F. Scalding
This water heater can deliver scalding water. Be careful
whenever using hot water to avoid scalding injury. Certain
appliances such as
dishwashers and
automatic clothes
washers may require
increased water
temperatures. By
setting the thermostat
on this heater to obtain
the increased water
temperature required
by these appliances
you may create the
potential for scald
injury.
To protect against
injury, install a mixing
valve in the water
system. This valve will
reduce point of use
discharge temperatures
by mixing cold and hot water in branch supply lines. Such
valves are available from your local plumbing supplier.
Table 4 details the relationship of water temperature and
The water heater must be full of water and the system fully
purged BEFORE powering the water heater. When lling the
water heater, open a hot water tap to release air in the tank and
piping. All air has been purged from the system when water
runs freely from the faucets.
Applying power to the water heater when it is not full of water
will damage the heat exchanger, and could result in property
damage, serious personal injury, or death. Such damages ARE
NOT covered by water heater warranty.
• Make certain the drain valve is completely closed.
• Open the shut-o valve in the cold water supply line.
• Open the hot water faucets to allow air to vent from the
heater and piping.
• Allow sucient time for the heater to completely ll
with water.
LP-441 Rev. 3.16.15
14
H. Applications
Figure 4 - Piping with Recirculation Line and Thermostatic Mixing Valve Piping
NOTES:
1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater ow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backow preventer
and the cold water inlet.
3. All circulators should have an integral ow check.
4. Drains and check valve between unit and storage tank will assist in purging air from system.
5. These drawings are meant to demonstrate system piping only. The installer is responsible for all equipment and detailing required by local
codes. In Massachusetts, you must install a vacuum relief valve per 248 CMR.
6. Mixing valve application is optional, but recommended to help prevent scalding.
7. Always shut o power to the water heater or isolate the heater from the system if ANY plumbing work is to be done. Running the water
heater without water will result in dry-ring.
An ASSE 1017 thermostatic mixing valve MUST be installed when using outdoor reset. Failure to do so could result in substantial
property damage, serious injury, or death.
The piping will not support the weight of the water heater circulator pump. Refer to the pump manufacturer’s installation
instructions to properly support the circulator pump. Failure to comply with these instructions could result in substantial property
damage, severe personal injury, or death.
LP-441 Rev. 3.16.15
15
Figure 5 - Piping with Air Handler on Side
NOTES:
1. Minimum pipe size should match connection size. Upsize pipe accordingly if greater ow is required.
2. A thermal expansion tank suitable for potable water must be sized and installed within this piping system between the backow preventer
and the cold water inlet.
3. All circulators should have an integral ow check.
4. Drains and check valve between unit and storage tank will assist in purging air from system.
5. These drawings are meant to demonstrate system piping only. The installer is responsible for all equipment and detailing required by local
codes. In Massachusetts, you must install a vacuum relief valve per 248 CMR.
6. Mixing valve application is optional, but recommended to help prevent scalding.
7. Always shut o power to the water heater or isolate the heater from the system if ANY plumbing work is to be done. Running the water
heater without water will result in dry-ring.
Figure 6 - Additional View with Air Handler on Side
NOTES FOR AIR HANDLER APPLICATION:
1. MASSACHUSETTS STATE PLUMBING CODE REQUIRES A DISTANCE NO GREATER THAN 50 FEET FROM THE WATER
HEATER TO THE FAN COIL IN THE AIR HANDLER.
2. MASSACHUSETTS STATE PLUMBING CODE REQUIRES AN ELECTRONICALLY TIMED CIRCULATOR PUMP TO ACTIVATE
EVERY SIX HOURS FOR 60 SECONDS. THIS CIRCULATOR IS REQUIRED TO BE BRONZE OR STAINLESS.
3. ALL WATER PIPING MUST BE INSULATED.
4. YOU MUST INSTALL A VACUUM RELIEF VALVE PER 248 CMR.
NOTE: THIS DRAWING IS MEANT TO DEMONSTRATE SYSTEM PIPING ONLY. THE INSTALLER IS RESPONSIBLE FOR ALL
EQUIPMENT AND DETAILING REQUIRED BY LOCAL CODES.
An ASSE 1017 thermostatic mixing valve MUST be installed when using outdoor reset. Failure to do so could result in substantial
property damage, serious injury, or death.
The piping will not support the weight of the water heater circulator pump. Refer to the pump manufacturer’s installation
instructions to properly support the circulator pump. Failure to comply with these instructions could result in substantial
property damage, severe personal injury, or death.
LP-441 Rev. 3.16.15
Loading...