HTP RGH-150 User manual

272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
LP-590 REV. 3.23.17
Crossover
Water Heater
INSTALLATION
START-UP
MAINTENANCE
PARTS
RGH-150 / 199 Models*
*“LP” denotes propane gas
NOTICE: HTP reserves the right to make product changes or updates without notice and will not be held liable for typographical errors
in literature.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
The surfaces of these products contacted by consumable water contain less than 0.25% lead by weight, as required by the Safe
Drinking Water Act, Section 1417.
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 WATER HEATER.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any water heater.
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 fire department. Installation and service must be provided by a qualified installer,
service agency, or the gas supplier.
California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer, birth defects, or
other reproductive harm.

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LP-590 REV. 3.23.17
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.
NOTICE
SAFETY INSTRUCTIONS
NOTICE is used to address practices not related to personal
injury.
SAFETY INSTRUCTIONS (or equivalent) signs indicate specific
safety related instructions or procedures.
NOTE: Contains additional information important to a procedure.

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LP-590 REV. 3.23.17
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 with this system, and additional publications including the
National Fuel Gas Code, ANSI Z223.1-2002, 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 Authority Having Jurisdiction may be a federal, state, local government, or individual such
as a fire chief, fire marshal, chief of a fire prevention bureau, labor department or health department, building official or 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 officer or departmental official may be the AHJ.
NOTE: HTP, Inc. reserves the right to modify product technical specifications and components without prior notice.
FOR THE INSTALLER
This appliance must be installed by qualified and licensed personnel. The installer should be guided by the instructions furnished with
the water heater, and with local codes and utility company requirements. In the absence of local codes, preference should be given to
the National Fuel Gas Code, ANSI Z223.1-2002.
INSTALLATIONS MUST COMPLY WITH:
Local, state, provincial, and national codes, laws, regulations and ordinances.
This manual must only be used by a qualified heating installer/service technician. Read all instructions in this manual before installing.
Perform steps in the order given. Failure to comply could result in substantial property damage, severe personal injury, or death.

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LP-590 REV. 3.23.17
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 the water heater underwent tests specified
in ANSI Z21.10.3 –latest edition.
TABLE OF CONTENTS
PART 1 –ITEMS SHIPPED WITH THE WATER HEATER.........................................................................................................6
PART 2 –SAFETY REGULATIONS ...........................................................................................................................................7
A. OPERATION AND INSTALLATION WARNINGS.......................................................................................................................7
B. IMPROPER COMBUSTION .......................................................................................................................................................8
C. GAS............................................................................................................................................................................................8
D. WHEN SERVICING THE WATER HEATER ..............................................................................................................................8
E. WATER CHEMISTRY REQUIREMENTS...................................................................................................................................8
F. FREEZE PROTECTION.............................................................................................................................................................9
G. SCALDING.................................................................................................................................................................................9
H. HIGH ELEVATION INSTALLATIONS.......................................................................................................................................10
PART 3 –TECHNICAL SPECIFICATIONS...............................................................................................................................10
PART 4 –PREPARE WATER HEATER LOCATION................................................................................................................13
A. BEFORE LOCATING THE WATER HEATER..........................................................................................................................13
B. LEVELING................................................................................................................................................................................14
C. CLEARANCES FOR SERVICE ACCESS................................................................................................................................14
D. RESIDENTIAL GARAGE AND CLOSET INSTALLATIONS.....................................................................................................15
E. EXHAUST VENT AND INTAKE PIPE.......................................................................................................................................15
F. CARBON MONOXIDE DETECTORS.......................................................................................................................................15
G. PREVENT COMBUSTION AIR CONTAMINATION.................................................................................................................15
H. REMOVING A WATER HEATER FROM A COMMON VENT SYSTEM ..................................................................................16
I. UNCRATING THE WATER HEATER........................................................................................................................................17
J. WALL-MOUNTING THE WATER HEATER ..............................................................................................................................17
PART 5 –VENTING...................................................................................................................................................................18
A. INTAKE PIPE AND EXHAUST VENT GUIDELINES................................................................................................................18
B. APPROVED VENT MATERIALS..............................................................................................................................................20
C. ALLOWED COMBINED VENT LENGTHS...............................................................................................................................21
D. TIGHTENING WATER HEATER COLLAR TO EXHAUST VENT AND INTAKE PIPE.............................................................22
E. VENT TERMINATION ..............................................................................................................................................................23
1. Direct Vent, Two Pipe Roof and Sidewall Vent Terminations................................................................................................23

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LP-590 REV. 3.23.17
2. Direct Vent, Optional Horizontal and Vertical Vent Kits.........................................................................................................24
3. Screen Installation.....................................................................................................................................................................24
4. Power Venting, Indoor Combustion Air Installation in Confined or Unconfined Space......................................................25
PART 6 –INSTALL THE CONDENSATE DRAIN.....................................................................................................................27
PART 7 –GAS PIPING..............................................................................................................................................................27
A. GAS PIPE SIZING TABLES .....................................................................................................................................................27
1. Gas Pipe Sizing..........................................................................................................................................................................27
2. Natural Gas Pipe Sizing ............................................................................................................................................................27
3. LP (Liquid Propane) Gas Pipe Sizing.......................................................................................................................................28
B. GAS CONNECTION REQUIREMENTS...................................................................................................................................28
C. ADDITIONAL PRECAUTION FOR EXCESS FLOW VALVE (EFV) .........................................................................................30
D. ADJUSTING GAS PRESSURE AT THE WATER HEATER.....................................................................................................30
E. SETTING AND VERIFYING THE COMBUSTION SETTING ...................................................................................................30
PART 8 –WATER PIPING ........................................................................................................................................................31
A. GENERAL PLUMBING CONNECTION GUIDELINES.............................................................................................................31
B. INSTALL A BACKFLOW PREVENTER....................................................................................................................................32
C. PIPING THE WATER HEATER................................................................................................................................................32
D. APPLICATIONS .......................................................................................................................................................................32
E. CIRCULATOR SIZING .............................................................................................................................................................41
F. PRESSURE RELIEF VALVE....................................................................................................................................................42
PART 9 –CONNECT ELECTRICAL POWER / INITIAL STARTUP .........................................................................................42
A. WIRING INFORMATION..........................................................................................................................................................43
B. DIP SWITCHES........................................................................................................................................................................43
PART 10 –OPERATING SYSTEM INSTRUCTIONS................................................................................................................49
A. CONTROL PANEL ...................................................................................................................................................................49
B. LCD DISPLAY DESCRIPTIONS ..............................................................................................................................................49
C. START-UP SEQUENCE ..........................................................................................................................................................49
D. CHANGING THE DHW SET-POINT ........................................................................................................................................50
E. CHANGING THE TIME.............................................................................................................................................................51
F. STATUS DISPLAY....................................................................................................................................................................51
G. INSTALLER MODE..................................................................................................................................................................52
H. USING RECIRCULATION MODES –STEP 1 .........................................................................................................................54
I. RECIRCULATION FUNCTIONS –USING RECIRCULATION MODES –STEP 2....................................................................55
1. Smart Auto-Learn Recirculation Function...............................................................................................................................56
2. Pro1, Pro2, Pro3, and PULS Recirculation Functions............................................................................................................56
J. ERROR MODE .........................................................................................................................................................................57
K. ERROR TREE ANALYSIS........................................................................................................................................................61
1. FLAME DETECTION...................................................................................................................................................................61
2. GAS DETECTION .......................................................................................................................................................................61
3. AIR PRESSURE SWITCH...........................................................................................................................................................62
4. Recirculation / Inlet / DHW / Operating Temperature / Exhaust SENSORS ..........................................................................62

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LP-590 REV. 3.23.17
PART 11 –FINAL INSTALLATION CHECKLIST .....................................................................................................................63
PART 12 –TROUBLESHOOTING ............................................................................................................................................65
PART 13 –MAINTENANCE PROCEDURES............................................................................................................................66
REPLACEMENT PARTS ................................................................................................................................................................69
Limited Warranty for RGH-150 / 199 Water Heaters....................................................................................................................74
MAINTENANCE REPORT ..............................................................................................................................................................76
MAINTENANCE NOTES.................................................................................................................................................................78
CUSTOMER INSTALLATION RECORD FORM.............................................................................................................................79
PART 1 –ITEMS SHIPPED WITH THE WATER HEATER
ITEM
DESCRIPTION
QUANTITY
Hybrid Water Heater
1
User and Installation Manuals
1 Each
Condensate Hose
(7855P-089)
1
Anchors and Wall Mounting
Bracket
(7850P-084)
4
Spare Parts Kit
(Gaskets and O-Rings)
(7850-280)
1
LP Conversion Kit –150 Model
(Part #7855P-698)
LP Conversion Kit –199 Model
(Part #7855P-452)
1
Vent Screens (3”)
(7850P-085)
2 Screens
OPTIONAL PARTS (Not Included)
150 PSI Pressure Relief Valve
(7850P-103)
1
¾” Tankless DHW Isolation
Valves
(7850P-090)
2

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LP-590 REV. 3.23.17
Vent Screens (2” Mesh)
(7850P-088)
2 Screens
Table 1 –Items Included with the Water Heater
PART 2 –SAFETY REGULATIONS
A. OPERATION AND INSTALLATION WARNINGS
To avoid serious injury or death, read, understand, and follow all the precautions listed here.
Vapors from flammable liquids will explode and can cause a fire, resulting in personal injury or death. The water heater has a burner
that can come on at any time and ignite vapors. DO NOT use or store flammable liquids around the water heater.
Improper venting can cause a build-up of carbon monoxide. Breathing carbon monoxide can result in brain damage or death. DO NOT
operate the water heater unless it is properly vented to the outside and has an adequate fresh air supply for safe operation. Inspect the
exterior exhaust gas outlet port and fresh air inlet port on a regular basis to ensure they are functioning properly.
A concentration of carbon monoxide as small as .04% (400 parts per million) in the air can be fatal. When making high fire or low fire
adjustments, CO levels must be monitored using a flue gas analyzer such that a CO level of no more than 150 ppm is exceeded at any
time during operation.
Adjusting the “low fire offset” or the “main flow restrictor” in small increments can result in a significant increase in CO concentration. To
avoid serious injury or death, DO NOT make any adjustments to the gas valve without monitoring the exhaust gases with a fully
functional and calibrated flue gas analyzer.
This water heater must be installed by a licensed plumber, licensed gas fitter, and/or professional service technician. Improper
installation and/or operation can cause a potentially hazardous situation, which, if not avoided, could result in serious injury or death,
and will void the warranty.
HTP, Inc. cannot anticipate every circumstance that might involve a potential hazard. Each installation has its own specialized
characteristics, requirements, and possible hazards. Therefore, all possible incidents are not included in these warnings. Proper and
safe installation, operation, and service are the responsibility of the professional service technician.
Proper care of the water heater is the user’s responsibility. Ensure the user carefully reads and understands the User’s Information
Manual before operating and maintaining the water heater.
Make sure the user knows the location of the gas shut-off valve and how to operate it. Immediately close the gas shut-off valve if the
water heater is subjected to fire, overheating, flood, physical damage, or any other damaging condition that might affect the operation of
the unit. Have the water heater checked by a qualified technician before resuming operation.
Do not power up the unit unless the gas and water supply valves are fully opened. Make sure the fresh air intake port and exhaust gas
port are open and functional.
No one but a professional service technician should attempt to install, service, or repair this water heater. There are no serviceable
parts which can be changed by the user / owner. User / Owner: Contact the original professional service technician if the water heater
needs repair or maintenance. If the original technician is unavailable, ask your gas supplier for a list of qualified service providers.
Keep the area around the water heater clean and free of all materials that can burn. DO NOT store or place gasoline, oils, spray paint,
or other flammable products near the water heater.
DO NOT use spray paint, hair spray, or any other flammable spray near the water heater or near the exterior fresh air intake port. DO
NOT place any items in or around the exterior exhaust gas outlet port and/or fresh air inlet port that could restrict or block the flow in or
out of the vent system.
DO NOT store or place newspapers, laundry, or other combustible items near the water heater or the exterior exhaust gas outlet and/or
fresh air inlet port.
The owner should inspect the system monthly for damage, water stains, signs of rust, corrosion, and exhaust vent and air intake
blockage. If inspection of the unit shows signs of damage, the water heater should be shut off until the problem is repaired by a
qualified technician.
After installation, all water heater safety devices should be tested.
This water heater is certified for indoor installations only. The water heater consists of gas ignition system components which must be
protected from water (dripping, spraying, etc.) during operation and service. Carefully consider installation location and the placement of
critical components (circulators, condensate neutralizers, etc.) before installing the water heater.
DO NOT allow children to operate this unit. DO NOT use this unit if it does not appear to be operating correctly. A qualified technician
should service and inspect the water heater annually.
The water heater temperature is factory set to 125oF (51.7oC). To avoid scalding, always check the temperature of the hot water before
bathing, showering, washing, etc. DO NOT adjust the water temperature while the water heater is being used by other persons.

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LP-590 REV. 3.23.17
NOTICE
If the water heater is exposed to the following, do not operate until all corrective steps have been made by a qualified service
technician:
1. FIRE
2. DAMAGE
3. WATER
DO NOT alter or modify the water heater or water heater controls. This can be dangerous and WILL VOID the warranty.
This water heater is equipped with a three prong plug. It should only be plugged directly into a properly grounded three prong
receptacle. DO NOT remove the ground plug from the plug.
Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee.
This water heater provides a overheat shutdown limit. In the event the water heater water exceeds the set point of the control limit, the
cutoff will trip and the water heater will shut down. Certain local codes require additional temperature limits. In addition, certain types of
systems may operate at temperatures below the minimum set point of the limit provided with the water heater. Contact HTP, Inc. for
additional overheat controls.
NOTE: When inquiring about service or troubleshooting, reference the model and serial numbers from the water heater rating label.
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN SUBMERGED IN WATER. Immediately call a qualified service technician.
The appliance MUST BE replaced if it has been submerged. Attempting to operate an appliance that has been submerged could create
numerous harmful conditions, such as a potential gas leakage causing a fire and/or explosion, or the release of mold, bacteria, or other
harmful particulates into the air. Operating a previously submerged appliance could result in property damage, severe personal injury,
or death.
NOTE: Appliance damage due to flood or submersion is considered an Act of God, and IS NOT covered under product warranty.
Be sure to disconnect electrical power before opening water heater cabinet or performing service. Label all wires while performing
service to ensure proper re-wiring of the water heater. Wiring errors can cause improper or dangerous operation. Failure to do so could
result in an electrical shock, improper water heater operation, property damage, serious personal injury, or death.
B. IMPROPER COMBUSTION
Do not obstruct the flow of combustion and ventilating air. Adequate air must be provided for safe operation. Failure to keep the
exhaust vent and intake pipe clear of ice, snow, or other debris could result in property damage, serious personal injury, or death.
C. GAS
Should overheating or gas supply fail to shut off, do not turn off or disconnect electrical supply to the circulator. Instead, shut off the gas
supply at a location external to the appliance.
D. WHEN SERVICING THE WATER HEATER
To avoid electric shock, disconnect electrical supply before performing maintenance.
To avoid severe burns, allow water heater to cool.
Do not use petroleum-based cleaning or sealing compounds in a water heater system. Gaskets and seals in the system may
be damaged, possibly resulting in substantial property damage.
Do not use “homemade cures” or “patent medicines”. Substantial property damage, damage to water heater, and/or serious
personal injury may result.
Always verify proper operation after servicing the water heater.
E. WATER CHEMISTRY REQUIREMENTS
Chemical imbalance of the water supply may affect efficiency and cause severe damage to the appliance and associated equipment.
Water quality must be professionally analyzed to determine whether it is necessary to treat the water. Various solutions are available to
adjust water quality. Adverse water quality will affect the reliability of the system. In addition, operating temperatures above 135oF will
accelerate the build-up of lime scale and possibly shorten appliance service life. Failure of an appliance due to lime scale build-up, low
pH, or other chemical imbalance IS NOT covered by the warranty.
The water must be potable, free of corrosive chemicals, sand, dirt, and other contaminates. It is up to the installer to ensure the water
does not contain corrosive chemicals or elements that can damage the heat exchanger. Potable water is defined as drinkable water
supplied from utility or well water in compliance with EPA secondary maximum contaminant levels (40 CFR Part 143.3) as shown in the
table below. If the water contains contaminants higher than outlined by the EPA, water treatment is recommended and additional, more
frequent maintenance may be required.

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LP-590 REV. 3.23.17
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or
licensed professional.
Contaminant
Maximum Allowable Level
Contaminant
Maximum Allowable Level
Total Hardness
(Residential Use - Below 140oF water
temperature)
200 mg/l
(12 grains/gallon)
Manganese
0.05 mg/l or PPM
Total Hardness
(Commercial Use - 140oF and above
water temperature)
120 mg/l
(7 grains/gallon)
pH
6.5-8.5
Aluminum
0.05 to 0.2 mg/l or PPM
Sulfate
205 mg/l or PPM
Chloride
100 mg/l or PPM
Total Dissolved Solids (TDS)
500 mg/l or PPM
Copper
1 mg/l or PPM
Zinc
5 mg/l or PPM
Iron
0.3 mg/l or PPM
Dissolved Carbon Dioxide
(CO2)
15 mg/l or PPM
Table 2 –Water Quality Specifications
F. FREEZE PROTECTION
Consider water heater piping and installation when determining water heater location.
NOTE: Damages resulting from incorrect installation or from use of products not approved by HTP, Inc. ARE NOT covered by warranty.
The water heater control is equipped with freeze protection that activates based on internal water temperature. See the table below for
details on freeze protection operation.
NOTE: Freeze protection will not be active if the water heater loses power.
System Freeze Protection
(Activates Based on Internal Water
Temperature)
Freeze Protection Operation
Stage 1 –If control detects water temperature of 46oF (8oC) and below, it turns the internal and external pumps
On for 600s and Off for 30s. This cycle repeats until the control detects return water temperature of 50oF (10oC)
and above.
Stage 2 –If control detects water temperature of 41oF (5oC) and below, it turns the burner on to meet a target
temperature of 104oF (40oC). The burner and internal and external pumps will run continuously during this stage
until the control detects return water temperature of 104oF (40oC) and above.
Stage 3 - If control detects water temperature of 34oF (1oC) and below, Er: 85 will appear on the display.
Table 3 –Freeze Protection Detail
G. SCALDING
This 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 temperature. 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, you should install a mixing valve in the water system. This valve will
reduce point of discharge temperature 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 time with regard to scald injury and may be used as a guide in determining the
safest water temperature for your applications.
Table 4 –Time and Temperature Relationship in Scalds
APPROXIMATE TIME / TEMPERATURE RELATIONSHIPS IN SCALDS
120oF
More than 5 minutes
125oF
1 ½ to 2 minutes
130oF
About 30 seconds
135oF
About 10 seconds
140oF
Less than 5 seconds
145oF
Less than 3 seconds
150oF
About 1 ½ seconds
155oF
About 1 second

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LP-590 REV. 3.23.17
H. HIGH ELEVATION INSTALLATIONS
Natural gas at high elevation might contain less heating value than typical 1,000 BTU/cu ft and therefore can cause improper air / gas
mix leading to improper combustion. For natural gas installations above 3,000 ft, call your gas provider to determine the heating value
of the supplied natural gas.
PART 3 –TECHNICAL SPECIFICATIONS
MODEL
150
199
Installation
Indoor, Wall Hung, Fully Condensing
Minimum / Maximum Input (Btu/Hr)
15,000 / 150,000
19,900 / 199,000
Hot Water
Capacity
35oF Rise
8.2 GPM
11 GPM
45oF Rise
6.4 GPM
8.5 GPM
77oF Rise
3.7 GPM
5 GPM
Flue System
Sealed Combustion Direct Vent, Power Vent
Vent Run
2” (50 feet), 3” (100 feet), Schedule 40 PVC, CPVC, PP
Weight (lbs)
90
100
Orifice Size
NG
7.2 mm (0.284”)
8.3 mm (0.327”)
LP
5.5 mm (0.217”)
6.2 mm (0.240”)
Gas Supply
Pressure
NG
3.5” to 14” WC
LP
3.5” to 14” WC
Manifold
Pressure
Min (3”)
NG/LP: 0.006
NG: 0.003” / LP: 0.004” WC
Max (3”)
NG/LP: -0.13
NG: -0.19” / LP: -0.20” WC
Power Supply
Main Supply
120V 60 Hz, 6A
Maximum Power
Consumption
72W (With Pump 100W)
General Operating Conditions
Temperature
Ambient Temperature Range: 33 –104oF (0.6 –40oC)
Operating Relative Humidity: Up to 90% at 104oF (40oC)
Shipping and Storage Temperature Range: -4 –176oF (-20 –80oC)
Input Ratings
Power Supply and Communication (CN4): 14V DC
Product Approvals and Requirements
EMC: 89/336/EEC
LVD: 73/23/EEC
Ignition System
Direct Electronic Ignition / Automatic Flame Sensing
Burner System
Single Orifice Premixed Fuel Modulation / Ceramic Fiber Burner
Gas Valve System
Air Ratio Valve
Minimum Flow Rate
0.5 GPM (zero activation with internal recirculation mode active)
Internal Pipe Material
Copper
Dimensions
W 17.5” – H 30” – D 15.5”
W 19.7” – H 32” – D 16.3”
Heat Exchanger Water Capacity (DHW)
2.3 Gallons
3.5 Gallons
Control Panel / Main Controller
P-950H / NGTH-10C
Water Pressure
Min 12 –Max 150 PSI
DHW Setpoint Temperature Range
100oF –140oF (35oC –60oC)
Connection
Sizes
Cold Water Inlet / Hot
Water Outlet /
Recirculation Inlet
¾” NPT
Gas Inlet
¾” NPT
Materials
Cabinet
Cold Rolled Carbon Steel
Heat Exchanger
316L Stainless Steel
Safety Devices
Optical Flame Sensor, Burner Plate High Limit (392oF), Water Temperature High Limit
Sensor (203oF), Gas and Water Leak Detection Devices, Freeze Protection (Three
Stage Operation - Activates at 46oF –See Freeze Protection in Installer Menu for
Details), Exhaust Temperature High Limit Sensor (190oF), Blocked Flue and Intake
Sensor, Condensate Switch, Built-In Low Water Cut-Off Probe
Table 5 –Technical Specifications