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User’s Information
Manual
Boiler, Heating Appliance, and VWH* Models
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.
Improper installation, adjustment, alteration, service, or maintenance could void product warranty and cause property
damage, severe personal injury, or death.
The manufacturer reserves the right to make product changes or updates without notice and will not be held liable for
typographical errors in literature.
*VWH Models: 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.
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.
272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
LP-447 Rev. 7.7.17
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Table of Contents
Part 1 - Product and Safety Information 3
A. Appliance Operation 4
B. Primary Water 4
C. Freeze Protection Fluids 5
Part 2 - Combustion Air Contamination Prevention 5
Part 3 - Maintenance Schedule 5
A. Service Technician 5
B. Owner Maintenance 6
LP-447 Rev. 7.7.17
Part 4 - Maintenance Procedures 6
A. Daily Maintenance 6
B. Monthly Maintenance 7
C. 6 Month Maintenance 7
D. Annual Maintenance - To be performed by a Qualied Service
Technician 8
Part 5 - Troubleshooting 9
Maintenance Notes 10
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Part 1 - Product and Safety Information
Proper care of this appliance is the user’s / owner’s responsibility.
User - Have this appliance serviced / inspected annually by a
qualied service technician.
FAILURE TO ADHERE TO THE GUIDELINES AND WARNINGS
IN THIS MANUAL CAN RESULT IN SUBSTANTIAL PROPERTY
DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
The combustion chamber insulation in this product contains
ceramic ber material. Ceramic bers can be converted
to cristobalite in very high temperature applications. The
International Agency for Research on Cancer (IARC) has concluded,
“Crystalline silica inhaled in the form of quartz or cristobalite from
occupational sources is carcinogenic to humans (Group 1).” DO
NOT, UNDER ANY CIRCUMSTANCES, OPEN THE COMBUSTION
CHAMBER OF THIS APPLIANCE! The combustion chamber of
this appliance may be opened by a qualied service technician
ONLY. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN
SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR
DEATH.
OPERATING INSTRUCTIONS
1. STOP! DO NOT use this appliance unless it is completely lled
with water.
2. Ensure electrical power to the appliance is powered OFF.
3. This appliance is equipped with an ignition device which
automatically lights the burner. DO NOT attempt to light the
burner by hand.
4. Turn the gas shut-o valve clockwise to the “OFF” position.
Do not force.
5. Wait ve (5) minutes to clear out any gas. If you smell gas,
STOP! Follow the information on page 2, this manual. If you
don’t smell gas, go to the next step.
6. Turn manual gas shut-o valve to the “ON” position.
7. Turn ON electrical power to the appliance.
8. Generate a call for hot water by opening a hot water faucet
in the system.
9. If the appliance will not operate, follow the instructions
on page 2 to turn o the gas to the appliance. Then call your
service technician or gas supplier.
It is the user / owner’s responsibility to know the location of the
gas shut-o valve and how to operate it. Immediately close the
gas shut-o valve if the appliance is subjected to re, overheating,
ood, physical damage, or any other damaging condition that
might aect the operation of the unit. Have the appliance checked
by a qualied technician before resuming operation.
DO NOT use this appliance if ANY part has been under water.
Immediately call a qualied technician to inspect the appliance
and replace any part of the control system or gas control which
has been under water.
DO NOT power up the appliance unless the gas and water supply
valves are fully opened. Make sure the fresh air intake pipe and
exhaust vents are open and functional.
DO NOT attempt to install, repair, or service this appliance.
Contact a qualied technician if the appliance needs repair or
maintenance. Ask your gas supplier for a list of qualied service
providers.
DO NOT use spray paint, hair spray, or any other ammable
sprays near the appliance or near the exterior fresh air intake pipe
termination. DO NOT place any items in or around the exterior
exhaust vent termination and/or fresh air intake pipe that could
restrict or block the ow in or out of the vent system.
DO NOT attempt to disassemble this appliance. If repairs are
required, contact a qualied service technician.
3
All safety devices must be tested after the appliance is installed.
Always verify proper appliance operation after servicing.
If an Error or Fault Code is displayed on the appliance contact a
qualied service technician.
The gas ignition system components must be protected from water
(dripping, spraying, rain, etc.) during appliance operation and service
(circulator replacement, condensate trap, control replacement, etc.)
This appliance features a factory installed overheating prevention
device. This limit provides appliance shutdown in the event that
the appliance water temperature exceeds the set point of the limit
control. Certain local codes require additional water temperature
limiting devices.
Attempting to operate this appliance on a gas supply other than
specied on the rating plate will result in improper appliance
operation, and could result in property damage, personal injury, or
death.
Call a qualied service technician if repair of the gas pipeline or
replacement of the gas regulator is necessary.
Exhaust gas entering the living space can cause carbon monoxide
poisoning. If exhaust gas should leak into the living space:
• Shut down the appliance.
• Close the gas valve.
• Open windows for ventilation.
Immediately call a qualied service technician to inspect the
appliance and exhaust vent pipe. Any damages to the exhaust vent
pipe should be repaired immediately.
DO NOT store ammable or combustible materials near this
appliance.
DO NOT wipe the appliance or control panel with a wet cloth.
DO NOT shut o the appliance for long periods of time during
potentially freezing conditions.
Ensure exposed water pipes are thermally insulated to prevent
damage due to freezing conditions. If the appliance is not to be
used for an extended period of time during freezing conditions, shut
down the system and completely drain the appliance.
If the water pipes should freeze, thaw the pipes with a hair dryer or
other electric heating device. If this does not work, call a qualied
service technician.
DO NOT touch the exhaust vent or hot water pipes during appliance
operation.
If using indirect water heating be careful when opening a hot water
faucet. Always be careful when draining water from the appliance.
Water temperature over 125oF can instantly cause severe burns,
or death, from scalds. Children, disabled, and elderly are at the
highest risk of being scalded. See instruction manual before setting
temperature at appliance. Feel water before bathing or showering!
Failure to follow the warnings in this manual could result in property
damage, personal injury, or death.
A. Appliance Operation
• Do not block ow of the appliance exhaust vent or intake pipe.
• Should overheating occur or gas supply fail to shut o, do
not turn o or disconnect electrical supply to the circulator.
Instead, shut o the gas supply at a location external to the
appliance following the instructions on page 2.
• Do not use this appliance if any part has been under water.
Immediately call a qualied service technician to inspect the
appliance and replace any part of the control system or gas
control that has been under water.
LP-447 Rev. 7.7.17
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B. Primary Water
• Do not attempt to clean the heating system. Call a qualied
service technician for service.
• If you notice any leaks, immediately call a qualied service
technician. Leaks in appliance or piping must be repaired at
once.
C. Freeze Protection Fluids
Closed loops that use glycol as heat transfer uid must be serviced
periodically. Glycol can break down over time, become acidic, and
attack gaskets and seals in appliances. This can result in property
damage, severe personal injury, or death.
Each glycol manufacturer has dierent recommendations for
testing and replacement. Do not test glycol quality yourself. Have
your qualied service technician check glycol quality during annual
servicing. If you are unsure when your glycol was last tested, call a
qualied service technician to test and replace glycol, if necessary.
Part 2 - Combustion Air Contamination Prevention
Do not operate the appliance if its combustion air intake is located in
or near one of the areas or in the vicinity of products listed in Table
1. These areas will always contain hazardous contaminates that
can form strong acids while passing through the burner and vent
system. These acids will corrode the appliance’s heat exchanger,
burner components and vent system, resulting in ue gas spillage
and/or water leakage, possible substantial property damage, severe
personal injury, or death. If the appliance combustion air intake is
located in any area likely to cause or contain contamination, or if
products which would contaminate the air cannot be removed, the
intake must be re-piped and terminated to another location.
DO NOT re-pipe ventilation system on your own. Call a qualied
service provider for assistance.
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
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 1 - Products and Areas Likely to Have Contaminants
NOTE: DAMAGE TO THE APPLIANCE CAUSED BY EXPOSURE TO
CORROSIVE VAPORS IS NOT COVERED BY WARRANTY. (Refer to
the limited warranty for complete terms and conditions.)
Areas Likely to Have
Contaminants
Dry cleaning / laundry areas and
establishments
Beauty shops
Refrigeration repair shops
Photo processing plants
Furniture renishing areas and
establishments
Remodeling areas
Garages and workshops
LP-447 Rev. 7.7.17
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Part 3 - Maintenance Schedule
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A. Service Technician
The following maintenance should be performed by a qualied
service technician annually:
General
• Attend to any reported problems.
• Inspect the interior of the appliance; clean and vacuum if
necessary.
• Clean the condensate trap and ll with fresh water.
• If applicable, check the condensate neutralizer and ensure it
is full of condensate neutralizing marble chips.
• Check for leaks: Water, gas, ue, and condensate.
• Verify exhaust vent and intake piping are in good condition
and sealed tight.
• Check exhaust vent and intake pipe bracing. Ensure bracing
is undamaged and in good condition.
• Check appliance water pressure, piping, and expansion tank.
• Check control settings.
• Check ignition electrode. Sand o any white oxide. Clean
and reposition.
• Check ignition and ground wiring.
• Check all control wiring and connections.
• Check burner ame pattern (stable and uniform).
Additional Items if Combustion or Performance is Poor
• Ensure appliance is connected to the proper gas type.
• Ensure appliance is connected to proper electrical power
supply.
• Check the water valves and gas shut-o valve. Ensure all are
fully open.
• Clean heat exchanger and ue ways.
• Remove burner assembly and clean burner head using
compressed air only.
The service technician should review service with the owner after
the maintenance items are completed.
B. Owner Maintenance
Periodically
• Check area around the appliance.
• Check and remove any blockage from the outdoor exhaust
vent and intake pipe terminations. DO NOT perform this
maintenance if exhaust vent and intake pipe terminations are
in dicult to reach locations.
• Check the temperature / pressure gauge.
Monthly
• VERY IMPORTANT: Check / test carbon monoxide detectors to
ensure proper operation per the manufacturer’s instructions.
• Check exhaust vent and intake piping.
• Check exhaust vent and intake pipe bracing. Ensure bracing is
undamaged and in good condition.
• Check the pressure relief valve.
• Check the condensate drain system.
• If applicable, check the condensate neutralizer and ensure it is
full of condensate neutralizing marble chips.
Every 6 Months
Check appliance piping and gas supply piping for corrosion or signs of
potential leakage.
Part 4 - Maintenance Procedures
The appliance must be inspected and serviced annually, preferably
at the start of the heating season, by a qualied service technician.
In addition, the maintenance and care of the appliance as outlined
in this manual must be performed by the user/owner to assure
maximum eciency and reliability. Follow the maintenance
procedures given throughout this manual. Failure to perform the
service and maintenance or follow the directions in this manual
could damage the appliance or system components, resulting in
substantial property damage, severe personal injury, or death.
A. Daily Maintenance
Check the Surrounding Area
To prevent the potential of substantial property damage, severe
personal injury, or death, eliminate the materials listed in Table
1 from the area surrounding the appliance and the vicinity of the
combustion air intake. If contaminates are found:
• Remove products immediately from the area.
• If contaminates have been there for an extended period, call
a qualied service technician to inspect the appliance for
possible damage from acid corrosion.
If products cannot be removed, immediately call a qualied service
technician to re-pipe the combustion air intake piping away from
the contaminated areas.
Combustible/Flammable Materials
Do not store combustible materials, gasoline, or other ammable
vapors or liquids near the appliance. If found, remove these materials
immediately.
Air Contaminates
If allowed to contaminate combustion air, products containing chlorine
or uorine will produce acidic condensate that will cause signicant
damage to the appliance. Read the list of potential contaminates and
areas likely to have these contaminates in Table 1, Part 2. If any of
these contaminates are in the room where the appliance is located, or
LP-447 Rev. 7.7.17
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combustion air is taken from one of the areas listed, the contaminates
must be removed immediately or the intake pipe must be relocated to
another area.
Check Exhaust Vent and Intake Pipe Terminations
Verify that the appliance exhaust vent and intake pipe terminations are
clean and free of obstructions. Remove any debris from the exhaust
vent and intake pipe openings. If removing the debris does not allow
the appliance to operate correctly, contact your qualied service
technician to inspect the appliance and the vent system.
Failure to inspect the venting system and have it repaired by
a qualied service technician can result in vent system failure,
causing severe personal injury or death.
Visually inspect the intake piping for any signs of blockage. Inspect
the entire length of the intake pipe to ensure piping is intact and all
joints are properly sealed. Inspect the intake pipe bracing. Ensure
bracing is undamaged and in good condition. Notify a qualied
service technician if any problems are found.
Check Pressure Relief Valve
• Visually inspect the primary pressure relief valve and
discharge pipe for signs of weeping or leakage.
• If the pressure relief valve often weeps, the expansion
tank may not be operating properly. Immediately contact
a qualied service technician to inspect the appliance and
system.
Check Exhaust Vent Condensate Drain System
• While the appliance is running, check the discharge end of
the condensate drain tubing. Ensure no ue gas is leaking
from the condensate drain tubing by holding your ngers
near the opening.
• If you notice ue gas leaking from the opening, this indicates
a dry condensate trap. If problem persists, contact a qualied
service technician to inspect the appliance and condensate
line and rell the condensate trap.
• If applicable, check the condensate neutralizer and ensure it
is full of condensate neutralizing marble chips.
Ensure the Appliance Cabinet is Closed
Ensure the appliance cabinet is closed. Tighten the two upper and
lower screws to secure it. The cabinet must be closed while the
appliance is running.
Check the Status of the Display Panel
Observe the Display Panel to ensure the appliance is powered on and
check for any error codes. Clear any debris from the panel.
Check the Power Source
Make sure the power cord is properly connected. The main power line
is connected to the manual switch box.
Check Temperature Display and Pressure Gauge
• Ensure the pressure reading on the gauge does not exceed 25
psig on the central heating loop of heating and combination
appliance models; 145 psig on VWH models. Higher pressure
readings may indicate a problem with the expansion tank.
• Ensure the temperature on the display panel does not exceed
the appliance setpoint. Higher temperature readings may
indicate a problem with the thermostat operating controls.
• Contact a qualied service technician if problem persists.
B. Monthly Maintenance
VERY IMPORTANT: Check / test carbon monoxide detectors to ensure
proper operation per the manufacturer’s instructions.
Check Exhaust Vent and Intake Piping
Visually inspect the exhaust vent piping for any signs of blockage,
leakage, or deterioration of the piping. Inspect the exhaust vent
bracing. Ensure bracing is undamaged and in good condition. Notify
a qualied service technician immediately if any problems are found.
C. 6 Month Maintenance
Check Primary and Gas Piping
• Remove the appliance cover and perform a gas leak
inspection following Operating Instructions, page 2, this
manual. If gas odor or leak is detected, follow procedures on
page 2. Call a qualied service technician.
• Visually inspect for leaks around the internal appliance
water connections and around the heat exchanger. Visually
inspect the external system piping, circulators, and system
components and ttings. Immediatelly call a qualied
service technician to repair any leaks.
Have leaks xed at once by a qualied service technician. Failure
to comply could result in substantial property damage, severe
personal injury, or death.
Operate Pressure Relief Valve
• Before proceeding, verify that the relief valve has been
piped to a safe place of discharge, avoiding any possibility
of scalding from hot water.
To avoid water damage or scalding due to relief valve operation, a
discharge line must be connected to the valve outlet and directed
to a safe place of disposal. This discharge line must be installed
by a qualied service technician or heating/plumbing installer in
accordance with the appliance installation manual. The discharge
line must be terminated so as to eliminate possibility of severe
burns or property damage should the valve discharge.
LP-447 Rev. 7.7.17
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• Read the temperature and pressure gauge to ensure the
system is pressurized. Minimum is 10 psi. Maximum is 25
psig on the central heating loop of heating and combination
appliance models; 145 psig on VWH models. Lift the relief
valve top lever slightly, allowing water to relieve through
the valve and discharge piping.
• If water ows freely, release the lever and allow the valve
to seat. Watch the end of the relief valve discharge pipe to
ensure that the valve does not weep after the line has had
hard time to drain. If the valve weeps, lift the lever again
to attempt to clean the valve seat. If the valve does not
properly seat and continues to weep, contact a qualied
service technician to inspect the valve and system.
• If water does not ow from the valve when you completely
lift the lever, the valve or discharge line may be blocked.
Immediately shut the appliance down per instructions on
page 2 and call a qualied service technician to inspect the
valve and system.
D. Annual Maintenance - To be performed by a Qualied
Service Technician
Check the Burner
The burner should be checked and cleaned only by a qualied
service technician.
Cleaning the Cold Water Inlet Filter (Draining the Appliance) (If
Applicable)
The Cold Water Inlet Filter should only be cleaned by a qualied
service technician.
Flushing the Appliance
Flushing the Appliance heat exchanger is a complicated procedure
that should only be performed by a qualied service technician.
NOTE: Improper maintenance WILL VOID appliance warranty.
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LP-447 Rev. 7.7.17
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Part 5 - Troubleshooting
To save time and money, review the following initial diagnostic steps before calling for service.
Problem Possible Solution
Make sure the the appliance is turned ON
If the control panel display is blank, ensure the power cord is intact. Check the circuit breaker
or fuse box. Ensure the appliance fuses are good.
Burner Does Not Ignite
Water Is Not Hot Enough
(VWH Models or Systems with Indirect
Water Heaters)
Water is Too Hot
(VWH Models)
Hot Water Temperature Fluctuates
(VWH Models)
Blower Continues to Operate After
Combustion Stops
Appliance Makes Abnormal Sounds
During Operation
Table 2 - Troubleshooting Chart
Make sure that the appliance is supplied with and full of water
Make sure the cold and hot water lines are not plumbed in reverse
Make sure the water inlet and outlet and gas supply lines are open
Make sure the water lines are not frozen
Make sure the temperature setting on the appliance / indirect water heater is not too low
Make sure any water supply line ltration devices are not clogged with debris
Make sure the appliance is connected to the correct gas supply
Check that supply and manifold gas pressures are in accordance with specications
Make sure that water temperature sensor wires are intact and properly connected
Make sure the temperature setting is not too hot on the appliance or indirect water heater
Make sure any lters in the cold water supply line are not clogged with debris
Make sure the appliance is connected to the correct gas supply
Make sure any lters in the cold water supply line are not clogged with debris
Make sure the appliance is connected to the correct gas supply
Make sure the supply gas pressure is sucient
This is normal. The blower operates for one minute after combustion has stopped to vent the
remaining exhaust gas from the ue.
There is a leak of combustion gas between the sealed chamber and exhaust tube inside the
unit.
Make sure the venting installation complies with the installation manual.
Make sure supply gas pressure is sucient. Insucient gas pressure will cause unstable burner ame and noise.
This appliance is equipped with a control system that will shut down and lock the appliance out if certain operating conditions occur. If the
appliance locks out, turn o the gas valve at the manual shuto. Check the vent terminations for obstructions. If no obstructions are found,
call a qualied service technician or the gas supplier to check the appliance. Failure to follow these instructions could result in property
damage, personal injury, or death.
Maintenance Notes
LP-447 Rev. 7.7.17
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