Rheem 199,000 Btu/hr User manual

INSTALLATION AND OPERATING INSTRUCTIONS
WARNING: If the information in this manual is not followed exactly, a re or
explosion may result causing property damage, personal injury, or loss of life.
Do not store or use gasoline or other ammable vapors and liquids or other
combustible materials 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 performed by a qualied licensedlicensed installer,
service agency or the gas supplier.
HIGH EFFICIENCY CONDENSING
TANKLESS WATER HEATER
199,000 Btu/hr Model
(Natural Gas or Propane)

INSTALLATION AND OPERATION INSTRUCTIONS
2
TANKLESS WATER HEATER 199
SAFETY CONSIDERATIONS
Installation, start-up and servicing of the unit must be done with due
care and attention, and must only be performed by competent, qualied,
licensed and trained heating technicians. Failure to read and comply with
all instructions and applicable National and local codes may result in
hazardous conditions that could result in property damage and injury to
occupants which in extreme cases might result in death.
HAZARDS & PRECAUTIONS
Supplied with the unit - The unit is shipped with an accessory parts kit
consisting of the following items:
• 1 x Wall Mounting Bracket, 4 x 1.75" bolts - Part # P-837
• 1 x Condensate trap assembly
• 1 x Installation & Operating Instructions
•1 x Controller manual
• 1 x Propane Conversion Kit: Part # P-802
WARNING
If the information in this
manual is not followed
exactly, a re or explosion
may result causing property
damage, personal injury, or
loss of life.
WARNING
Points out a potentially
hazardous situation which
must be avoided to prevent
serious injury or death.
CAUTION
Points out a potentially
hazardous situation which
must be avoided to prevent
possible moderate injury and/
or property damage
NOTE
Points out installation,
maintenance and operation
details that will result in
enhanced e󰀩ciency, longevity
and proper operation of your
unit.
DANGER
Points out an imminently
hazardous situation which
must be avoided in order to
prevent serious injury or
death.
BEST PRACTICES
Points out recommendations
for better installation.

3
INSTALLATION AND OPERATING INSTRUCTIONS
TANKLESS WATER HEATER 199
SPECIFICATION 199,000 BTU
Input (Natural Gas or Propane*) - MBH 28.5-199
U.E.F 0.9
DHW Flow Rate - USgpm / l/m 35°F (19°C) Temp Rise 10.1 (38)
45°F (25°C) Temp Rise 7.9 (30)
67°F (36°C) Temp Rise 5.4 (20)
Dimensions - in/mm 17.7 x 29.8 x 10.9 (450 x 757 x 277)
Weight (empty) - lbs/Kg 68 / 31
Installation Type Indoor only wall-hung
Venting Type Forced Draft Direct Vent
Electronic Ignition
Water Pressure - psig 40 - 150
Min Gas Pressure (Nat. Gas or Propane*) - inch w.c. 4
Max Gas Pressure (Nat. Gas or Propane*) - inch w.c. 14
Minimum Flow Rate to activate DHW heating -
USgpm /l/m 0.5 (1.9)
Connection Sizes Cold Water Inlet 3/4" Male NPT
Hot Water Outlet 3/4" Male NPT
Gas Inlet 3/4" Male NPT
Pressure Vessel water content – USG/Liters 0.19 / 0.72
Ambient Temperature – Low (°F/°C) 32 / 0
Ambient Temperature – High (°F/°C) 122 / 50
Max relative humidity (non-condensing) 90%
Min water Temperature – Domestic Hot Water (°F/°C) 105 / 40
Max water Temperature – Domestic Hot Water (°F/°C) 149 / 65
Power Supply Main Supply 120Vac, 60Hz
Watts @ full re 100 watts
Materials Casing Painted steel and plastic
Heat Exchangers Copper tubes in AL block
Venting
Canada venting must meet ULC S636
Intake & Exhaust 2" or 3" PVC, CPVC,
Polypropylene
Venting Clearances 0" to combustibles
Safety Devices Flame Proving module, Flue
Gas Temperature Sensor,
Protective fuse
Certied design ANSI Z21.10.3 • CSA 4.3
Freeze Protection Yes
 *UnitsshipconguredforNaturalGas(NG)withaPropane(LP)conversionkitincluded.ConvertinganLPunitbacktoNGrequiresthecertiedNGconversionkitthat
can be ordered separately.
SPECIFICATIONS

INSTALLATION AND OPERATION INSTRUCTIONS
4
TANKLESS WATER HEATER 199
BURN
HOT
DANGER
° Water temperature over 125°F (52°C) can cause severe burns instantly
or death from scalds.
° Children, disabled, and elderly are at highest risk of being scalded.
° See instruction manual before setting temperature at water heater.
° Feel water before bathing or showering.
° Temperature limiting valves are available, see manual.
WARNING
CAUTION
WATER HEATER INSTALLATION GUIDELINES
ADJUSTABLE TEMPERATURE SETTING
°Hotter water increases the risk of scald injury. Before changing the temperature setting, see
instruction manual.
°This unit must be installed in accordance with local codes, if any; if not follow the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code,
CAN/CSA B149.1, as applicable.
°Failure to correctly install and operate this appliance can result in severe personal injury
or death.
°The unit shall have a pressure relief valve installed within 6"[152mm] of the DHW HOT
outlet connection.
Refer to the unit’s User Manual before operating the relief valve.
°The unit requires a pressure relief valve identified with the ASME V or HV symbol and
set to relieve at or below 150psi of domestic water pressure and a minimum relieving capacity
of 199,000 Btu/hr with 3/4"NPT threads. For safe operation of the unit, the relief valve
must not be removed from its designated point of installation or plugged.
°Read and follow warnings and instructions.
°
Touch the panel above the white dot , then touch the Faucet . Adjust the water temperature
with the Plus + and Minus – then touch the Return button to save the changes.
TIME/TEMPERATURE RELATIONSHIP IN SCALDS
WATER TEMPERATURE TIME TO PRODUCE A SERIOUS BURNTIME TO PRODUCE A SERIOUS BURN
120°F (49°C) More than 5 minutes
125°F (52°C) 1 ½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1 ½ seconds
155°F (68°C) About 1 second
Table courtesy of Shriners Burn Institute

5
INSTALLATION AND OPERATING INSTRUCTIONS
TANKLESS WATER HEATER 199
CONTENTS
1.0 INSTALLATION..........................................1-1
1.1 GENERAL........................................................1-1
1.2 CODE REQUIREMENTS ............................................1-3
1.3 LOCATION .......................................................1-3
1.3.1 Mobile Home Installations ........................................1-4
1.3.2 Removing/installing the front panel .................................1-5
1.4 EXHAUST VENTINGANDAIR INTAKE.................................1-6
1.4.1 Applications ..................................................1-10
1.4.2 Exhaust Vent Material ..........................................1-10
1.4.3 Vent Travel ...................................................1-10
1.4.4 Venting Passage Through Ceiling and Floor .........................1-12
1.4.5 Rooftop Vent Termination........................................1-12
1.4.6 Sidewall Vent Termination .......................................1-14
1.4.7 “Direct Vent” Combustion Air Intake Piping ..........................1-18
1.4.8 “Indoor Air” Combustion Air Intake .................................1-19
1.4.9 Closet Installations.............................................1-19
1.5 CONDENSATE REMOVAL..........................................1-20
1.5.1 Condensate Trap ..............................................1-20
1.5.2 Installing The Condensate Trap ...................................1-20
1.5.3 Further Installation Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21
1.6 WATERAND SPACE HEATING APPLICATION..........................1-22
1.7 DOMESTIC HOT WATER SYSTEM...................................1-24
1.7.1 Domestic Hot Water System .....................................1-25
1.7.2 Domestic Hot Water Piping ......................................1-26
1.7.3 Tankless Domestic Hot Water with a Storage Tank ....................1-27
1.8 GAS PIPING.....................................................1-29
1.9 ELECTRICAL CONNECTIONS ......................................1-30
1.9.1 120VAC Line Voltage Hook-up....................................1-30
1.9.2 Accessing Controller Terminal Strip ................................1-30
1.9.3 Power Quality and Electrical Protection ............................1-30
2.0
UNIT SYSTEM OPERATION .....................................2-1
2.1 GENERAL........................................................2-1
2.2 CONTROL .......................................................2-2
2.3 INSTALLER INTERFACE ............................................2-2
2.3.1 Turning Appliance ON/OFF .......................................2-2
2.3.2 Programming Mode.............................................2-3
2.4 TANKLESS DOMESTIC HOT WATER MODES...........................2-4
2.4.1 Tankless Domestic Hot Water - Standard and ECO Comfort Modes........2-4
2.5 SEQUENCE OF OPERATION ........................................2-5
2.6 ACCESSING THE INFORMATION MENU...............................2-6
2.7 RESETTING THE MAINTENANCE COUNTER...........................2-8
3.0 STARTUP & COMMISSIONING..............................3-1
3.1 LIGHTING & SHUTTING DOWN THE UNIT .............................3-1
3.2 PRIOR TO START-UP ..............................................3-2
3.2.1 Pre-Ignition Checks .............................................3-2
3.2.2TestIgnitionSafetyShuto󰀨 .......................................3-2

INSTALLATION AND OPERATION INSTRUCTIONS
6
TANKLESS WATER HEATER 199
3.3 COMMISSIONING .................................................3-2
3.4 FUEL CONVERSION ...............................................3-4
3.4.1 Gaining Access To Combustion Chamber, Burner Removal Instructions.....3-5
4.0 MAINTENANCE..........................................4-1
4.1 WATER HEATER MAINTENANCE.....................................4-1
4.1.1 General Care ..................................................4-1
4.1.2 Inspection.....................................................4-1
4.1.3 Venting .......................................................4-1
4.1.4 Condensate Trap ...............................................4-1
4.1.5 Burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1
4.1.6 Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-2
4.1.7 Gas Piping ....................................................4-2
4.1.8 Control Module.................................................4-2
4.1.9 Freeze Protection...............................................4-2
4.1.10 Relief Valve - Maintenance and Testing .............................4-2
4.1.11 Domestic Hot Water System......................................4-2
4.1.12 DHW Filter cleaning instructions ..................................4-3
4.1.13 Fan removal instructions ........................................4-3
4.1.14 Fan installation instructions ......................................4-4
4.1.15 Cleaning the Condensate Trap....................................4-4
4.1.16 Reset the Maintenance Counter...................................4-6
5.0 TROUBLESHOOTING .....................................5-1
5.1 PRELIMINARY CHECKS ............................................5-1
5.2 ELECTRONIC COMPONENTS .......................................5-2
5.2.1 Temperature Sensors............................................5-2
5.2.2 Cabinet Sensors................................................5-2
5.2.3 Flue Gas Temperature Sensor.....................................5-3
5.2.4 Domestic Hot Water Flow Sensor ..................................5-3
5.2.5 Domestic Hot Water Sensor.......................................5-3
5.2.6 Domestic Hot Water Bypass Valve..................................5-4
5.2.7 Domestic Cold Water Sensor......................................5-4
5.2.8 Fan/Blower....................................................5-4
5.3 FAULTS AND NOTIFICATIONS .......................................5-5
5.3.1 Fault Codes ...................................................5-5
5.3.2NoticationCodes ..............................................5-9
5.4 OTHER FAULTS..................................................5-10
5.4.1 No Domestic Hot Water (DHW) ...................................5-10
5.4.2 Domestic Hot Water Does Not Reach The Correct Temperature..........5-11
5.4.3 Burner Ignites Loudly ...........................................5-11
5.4.4 Burner Resonates .............................................5-11
6.0 REPLACEMENTS KITS ....................................6-1
7.0 WIRING DIAGRAMS ......................................6-2
INSTALLATION & COMMISSIONING REPORT..............................6-4
SERVICE RECORD ...................................................6-5
NOTES ............................................................6-6

7
INSTALLATION AND OPERATING INSTRUCTIONS
TANKLESS WATER HEATER 199
PRE-INSTALLATION CHECK
Carefully consider clearances and access, vent travel and termination, gas
supply, condensate removal and combustion air supply.
Consider the following:
•Install the water heater in areas where the combustion air source is free of
contamination. Exposure to corrosive chemical fumes such as chlorinated
and/oruorinatedhydrocarbonscanreducethelifeofaunit.Cleaners,
bleaches,airfresheners,refrigerants,aerosolpropellants,dry-cleaninguids,
de-greasers and paint-removers all contain vapors that can form corrosive
acidcompoundswhenburnedinagasame.Avoidairbornechloridessuch
as those released with the use of laundry detergents.
•Locate the unit where water leakage will not result in damage to the area (for
example,donotinstallabovecarpeting).Ifyoucannotndasuitablelocation,
installadrainpanwithanadequatedrainundertheappliance.
•At a new construction site, or during renovations, protect the unit from drywall
dust or other construction related contaminants.
○Ensure combustion air is drawn from a CLEAN source (e.g. outdoors).
○Isolate the unit from interior dust sources.
•When the unit is in operation, assess the impact of the steam plume normally
experienced at the exhaust terminal of a condensing water heater. Generally,
intake and exhaust pipes should terminate at a rooftop or wall location free of
obstructions. Water heater condensate is corrosive. Protective measures must
be taken to prevent corrosion damage to metal roofs or other metal building
components in contact with the condensate. Keep exhaust plumes well
away from all building air intakes including those of neighboring properties
byfollowingallrequirementsofthejurisdictionhavingauthorityandthis
installation manual.
•Place the exhaust outlet so it reaches 12" minimum above the down-turned
intaketoavoiduegascontaminationofthecombustionair.
•For sidewall venting options: Both the inlet and exhaust terminations must
be located on the same side of the building. You can elevate both pipes
in“periscopestyle”afterpassingthemthroughthewalltogainrequired
clearance above grade and snow level.
•Examine the condensate outlet to ensure proper disposal of condensate
will occur during operation. A condensate neutralizer must be installed if the
condensatewillowintoadrainsubjecttocorrosion.
•Ensure that the pressure relief valve is installed with no valves or other
means of isolation between its inlet and the unit. Pipe the relief valve with
unobstructed piping (minimum 3/4" diameter) to a safe discharge location.
• Inlocationswherepowersupplyqualityvariesorisunstable,consider
installing surge protection and power conditioners (up to and including battery
back-up uninterrupted power supply devices).
•Ensure the domestic hot water demands are considered before purchasing
the Tankless Water Heater. You may need to add a storage tank.
CAUTION
Care must be taken to
properly size the unit for
its intended use. Prolonged
full-re run time, over-
sizing or under-sizing,
and incorrect ow rates
through the unit can lead
to increased maintenance
costs, equipment stress and
premature failure.
WARNING
Do not use this unit if any
part has been under water.
Immediately call a qualied
service technician to inspect
the unit and to replace any
part of the control system and
any gas control that has been
under water.
DANGER
Should overheating occur
or the gas supply fails to
shut o󰀨, do not turn o󰀨 or
disconnect the electrical
supply to the pump. Instead
shut o󰀨 the gas supply at
a location external to the
appliance.

INSTALLATION AND OPERATION INSTRUCTIONS
8
TANKLESS WATER HEATER 199
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1-1
INSTALLATION
TANKLESS WATER HEATER 199
17.7in
[450mm]
3.1in
[79mm]
29.8in
[757mm]
4.3in
[109mm]
FRONT
1.0 INSTALLATION
1.1 GENERAL
ThisHighE󰀩ciencyCondensingtanklesswaterheaterisdesignedtobeusedfor
domestic (residential) purposes. Domestic use is considered to be an average
annual gas usage of less than 4000 m3(140,000 ft3) for natural gas or 5680 L
(1500 US gallons) for propane. The products are fully condensing units with
variable input ranges (see specication chart - page 3). The units are approved
as “Category IV” vented appliances using Direct Vent (sealed combustion).
Figures 1a and 1b show outer case dimensions and piping. Use this diagram to
ndasuitablelocationfortheunit.See also Section 1.3 Location.
Figure 1a: Dimensions / Connections for Tankless Water HeaterTankless Water Heater
10.9in
[278mm]
SIDE
NOTE
Commercial use is allowed
only if the unit is regularly
maintained, and the heat
exchanger is cleaned at least
once a year, or more often if
the unit is experiencing heavy
use. Note: If the appliance is
serving only one residential
home in a multi-family
building, then the appliance
shall be considered used for
residential use.

INSTALLATION AND OPERATION INSTRUCTIONS
1-2
TANKLESS WATER HEATER 199
4.7in
[120mm]
4.7in
[120mm]
TOP
B (ALTERNATE)
A
B
4.5in
[114mm]
B (ALTERNATE)
B
6.7in
[170mm]
BOTTOM
3.7in
[95mm] 2.6in
[65mm]
2in
[50mm]
D
FE
C
C
L
Figure 1b: Dimensions / Connections for Tankless Water HeaterTankless Water Heater
DESCRIPTION TANKLESS WATER HEATERTANKLESS WATER HEATER
AExhaust Outlet 2" Schedule 40 PVC
BCombustion Air inlet 2" Schedule 40 PVC
C
Cold Domestic Water
Connection&inletlter
3/4" Male NPT
DHot Domestic Water
Connection 3/4" Male NPT
EGas Inlet 3/4" Male NPT
FCondensate Outlet 3/4" Hose
Table 1: Connections
16in
[406mm]
BRACKET
BRACKET

1-3
INSTALLATION
TANKLESS WATER HEATER 199
1.2 CODE REQUIREMENTS
TThe Tankless Water Heaterhe Tankless Water Heater isis certiedunderCSA4.3/ANSIZ21.10.3.
Theinstallationmustconformtotherequirementsoftheauthorityhaving
jurisdictionor,intheabsenceofsuchrequirements,totheNational Fuel Gas
Code, ANSI Z223.1/NFPA 54, and/or Natural Gas and Propane Installation Code,
CAN/CSA B149.1. The installation must also conform to the Canadian Electrical
Code Part 1 CSA C22.2 No.1 and/or the National Electrical Code ANSI/NFPA 70.
1.3 LOCATION
TheThe unit is designed and approved for indoor installation. Its venting options
provideexibilityoflocation;forexample,placementinanalcove,basement,
utility room or closet. The unit is approved for installation in a closet (see Table 2
for clearances to combustibles).
Conditions for safe installations
Ensure that the surrounding conditions are between 32°F [0°C] and 122°F [50°C]
and less than 90% relative humidity.
Install the unit in areas where the combustion air source is free of
contamination.
Exposure to corrosive chemical fumes such as chlorinated and/or
uorinated hydrocarbons can reduce the life of a water heater. Cleaners,
bleaches,airfresheners,refrigerants,aerosolpropellants,dry-cleaninguids,
de-greasers and paint-removers contain vapors that can form corrosive acid
compoundswhenburnedinagasame.Alsoavoidairbornechloridessuchas
those released with the use of laundry detergents.
This unit must not be installed in an area where water leakage will result in
damagetotheareasadjacentorbelowtheunit.Whensuchareascannotbe
avoided,asuitabledrainpanwithadequatedrainmustbeinstalledunderthe
unit.
Water heater fastening
Approximate weight for the empty water heater is 68 lbs / 31 kg. For support
fasteners, use at least two of the four supplied ¼" x 1¾" long lag screws. Installers
must supply 1/4" bolts if metal mounting systems are used. Attach the wall
mounting bracket to a structurally sound wall that is capable of supporting the
combined weight of the unit and piping components which can exceed 150 lbs.
(68kg).
Water heater clearance
Otherfactorsa󰀨ectingpotentialmountingsites:
• Ensureminimumclearancerequirementsforcombustiblematerials(see
Table 2)aresatised.
•For ease of access, we recommend a minimum 24" clearance at the front and
24" above. Check local codes for additional access and service clearance
requirements.
• At a new construction site, or during renovations, protect the unit from
drywall dust or other construction related contaminants. Combustion air
must be drawn from a CLEAN source (e.g. outdoors) and the unit must be
isolated from interior dust sources.
WARNING
- Keep the unit area free
and clear of combustible
materials, gasoline, and other
ammable vapors and liquids.
- C ombustion air must not be
drawn from areas containing
corrosive air from swimming
pools or spas, including air
directly next to outdoor pools
and spas.
- T he unit must not be
exposed to water leaks from
piping or components located
overhead. This includes
condensation dropping from
un-insulated cold water lines
overhead.
- Ensure the gas ignition
system components are
protected from water (dripping,
spraying, rain, etc.) during
appliance operation and when
servicing (pump replacement,
condensate trap servicing,
control replacement, etc.)
-California Proposition 65
This product contains
chemicals known to the
state of California to cause
cancer, birth defects, or other
reproductive harm.

INSTALLATION AND OPERATION INSTRUCTIONS
1-4
TANKLESS WATER HEATER 199
SURFACE DISTANCE FROM COMBUSTIBLE
SURFACES
RECOMMENDED DISTANCE
FOR INSTALLATION AND
SERVICE
Front 2" 24"
Rear 0" 0"
Left Side 1.5" 6"(labelsmaybedi󰀩culttoreadwith
reduced clearance)
Right Side 4" 6"(labelsmaybedi󰀩culttoreadwith
reduced clearance)
Top 2" 24"
Bottom 8" 24"
Table 2: Clearance from the unit cabinet
You must provide a minimum distance below the water heater of 8" to allow
clearance for the supplied condensation trap assembly. More clearance will
typically be required to accommodate associated water and gas piping.
FOR BRACKET USE TWO ¼” X 1¾” LAG
SCREWS WITH FLAT WASHERS INTO
STUDS. FOR METAL MOUNTING SYSTEM
USE ¼” BOLTS WITH FLAT WASHERS.
FOR BRACKET USE TWO ¼” X 1¾” LAG
SCREWS WITH FLAT WASHERS INTO
STUDS. FOR METAL MOUNTING SYSTEM
USE ¼” BOLTS WITH FLAT WASHERS.
UNIT
MOUNT BRACKET TO WALL,
HOOK UNIT OVER TOP.
Figure 2: Wall mounting of unit
1.3.1 Mobile Home Installations
TheTankless Water Heater is approved for installation in a manufactured home
(mobile home). Units installed in a mobile or manufactured home must also
conform to the Manufactured Home Construction and Safety Standard, Title 24
CFR, Part 3280 and/or CAN/CSA Z240 MH Series, Mobile Homes.
WARNING
- Exposed water piping and
associated components
(relief valves, circulators, etc.)
must not be in contact with
combustible materials. Check
local codes for required
clearances and/or provide
adequate insulation.
- DO NOT MOUNT THIS UNIT - DO NOT MOUNT THIS UNIT
TO A HOLLOW SHEET ROCK TO A HOLLOW SHEET ROCK
WALL USING ANCHORS. The WALL USING ANCHORS. The
wall mounting bracket must wall mounting bracket must
be bolted to wall studs or a be bolted to wall studs or a
solid wall structure to supportsolid wall structure to support
the combined weight of the the combined weight of the
unit which can exceed 150 unit which can exceed 150
lbs. (68kg) once installed.lbs. (68kg) once installed.
- Take precautions to avoid
injury during the installation
of this unit.

1-5
INSTALLATION
TANKLESS WATER HEATER 199
1.3.2 Removing/installing the front panel
• The front panel of the unit must be removed to perform various maintenance
activities.
• Loosen both screws (1) under the unit by using a 5 mm allen key. (They are
captive and therefore will not drop out of the lower housing).
• Slide the front panel (2) upward and then remove it by pulling it towards you.
To replace the front panel, proceed as follows:
• Position the front panel (3) against the unit and slide it downwards until it is
correctly connected to the lower fascia panel.
• Hand tighten screws under the unit using a 5 mm allen key (do not over
tighten)
CAUTION
The front panel has a rubber
seal around the inner edge
sometimes making it very sti󰀨
to slide o󰀨 so please ensure
the unit is secured to the wall
correctly before attempting
this procedure!
WARNING
This is a room sealed cover
and therefor extremely
important that it is tted
correctly, failure to do so can
result in ue gas spillage and
carbon monoxide emissions,
causing severe personal
injury or death.
2
3
1
Figure 3: Loosen screws Figure 4: Frontpanel upward
Figure 5: Positioning the frontpanel

INSTALLATION AND OPERATION INSTRUCTIONS
1-6
TANKLESS WATER HEATER 199
1.4 EXHAUST VENTING AND AIR INTAKE
When you plan the installation, ensure that you consider appropriate venting
materials, travel and termination decisions.
Consider the following when selecting a vent termination location:
• Select a location where the units exhaust will not damage nearby plants,
shrubs,airconditioningequipmentorbeobjectionabletothehomeowner.
• Exhaust gases will form a visible plume during cold weather. Avoid areas
where the plume could obstruct window views.
• Prevailingwindscouldcausewater/icebuilduponnearbyobjectsincluding
building surfaces.
• Avoid locations where people or pets could come in contact with exhaust
gases.
• Avoidlocationssuchasinsidebuildingcorners,nearadjacentbuildingsor
surfaces, window wells, stairwells, alcoves, courtyards, or other recessed
areaswherewindcoulda󰀨ecttheunit’sperformanceorcauseexhaustgas
recirculation.
• Select a location where the termination is not likely to be damaged by foreign
objectssuchasstonesorballs,orissubjecttobuildupofdebrissuchas
leaves.
Installventinginaccordancewiththerequirementsofthejurisdictionhaving
authority: in Canada, Part 8, Venting Systems of the B149.1-10 Code and any
other local building codes are to be followed. In the USA the National Fuel Gas
Code, ANSI 223.1, latest edition, prevails. Where there is a discrepancy between
theinstallationinstructionsbelow,andthecoderequirements,youmustapplythe
morestringentofthetworequirements.
Provisions for combustion and ventilation air in accordance with the section “Air
for Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, or Clause 8.2, 8.3 or 8.4 of Natural Gas and Propane Installation Code,
CAN/CSA B149.1, or applicable provisions of the local building codes.
Tankless
Water Heater
FLUE GAS
EXHAUST TO
OUTDOORS
Figure 6: Basic exhaust vent assembly
WARNING
- Venting, condensate
drainage, and combustion
air systems for all units
must comply with applicable
codes and the instructions of
their respective Installation
manuals.
- Inspect nished vent and air
piping thoroughly to ensure
all are airtight and comply
with the instructions provided
and with all requirements of
applicable codes.
- Failure to follow all
instructions can result in
ue gas spillage and carbon
monoxide emissions, causing
severe personal injury or
death. Failure to comply will
result in severe personal
injury or death.
DANGER
Failure to properly vent
the unit to the outdoors
as outlined in this Venting
section will result in death
or serious personal injury.
To avoid the risk of re,
explosion, or asphyxiation
from carbon monoxide,
NEVER operate the unit
unless it is properly vented
and has adequate air supply
for proper operation as
outlined in this Venting
section. This unit must have
air supply connected and
terminated to the outdoors.
DANGER
Do not common vent this
tankless water heater with
any other existing or new
appliance.

1-7
INSTALLATION
TANKLESS WATER HEATER 199
In the Commonwealth of Massachusetts
TheCommonwealthofMassachusettsrequirescompliancewithregulation248
CMR 4.00 and 5.00 for installation of through-the-wall vented gas appliances as
follows:
(a)Forallside-wall,horizontallyvented,gas-fueledequipmentinstalledinevery
dwelling, building, or structure used in whole or part for residential purposes,
including those owned or operated by the Commonwealth and where the side-
wallexhaustventterminationislessthanseven(7)feetabovenishedgrade
in the area of the venting, including but not limited to decks and porches, the
followingrequirementsshallbesatised.
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of
installationoftheside-wall,horizontallyvented,gas-fueledequipment,the
installingplumberorgasttershallobservethatahard-wiredcarbonmonoxide
detectorwithanalarmandbatterybackupisinstalledontheoorlevelwherethe
gasequipmentistobeinstalled.Inaddition,theinstallingplumberorgastter
shall observe that a battery-operated or hard-wired carbon monoxide detector
with an alarm is installed on each additional level of the dwelling, building, or
structureservedbytheside-wall,horizontallyvented,gas-fueledequipment.
It shall be the responsibility of the property owner to secure the services of
qualiedlicensedprofessionalsfortheinstallationofhard-wiredcarbonmonoxide
detectors.
a.Intheeventthattheside-wall,horizontallyvented,gas-fueledequipmentis
installed in a crawl space or an attic, the hard-wired carbon monoxide detector
withalarmandbatterybackupmaybeinstalledonthenextadjacentoorlevel.
b.Intheeventthattherequirementsofthissubdivisioncannotbemetatthetime
of completion of installation, the owner shall have a period of thirty (30) days to
complywiththeaboverequirements,provided,however,thatduringsaidthirty
(30) day period, a battery-operated carbon monoxide detector with an alarm shall
be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide
detectorasrequiredinaccordancewiththeaboveprovisionsshallcomplywith
NFPA720andbeANSI/UL2034-listedandIAS-certied.
3.SIGNAGE.Ametalorplasticidenticationplateshallbepermanentlymounted
to the exterior of the building at a minimum height of eight (8) feet above grade
directly in line with the exhaust vent terminal for the horizontally vented, gas-
fueledheatingapplianceorequipment.Thesignshallread,inprintsizenoless
than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR
OF ALL OBSTRUCTIONS.”
4. INSPECTION. The state or local gas inspector of the side-wall, horizontally
vented,gas-fueledequipmentshallnotapprovetheinstallationunless,upon
inspection, the inspector observes carbon monoxide detectors and signage
installed in accordance with the provisions of 248 CMR 5.08 (2)(a)(1 through 4).
(b)EXEMPTIONS:Thefollowingequipmentisexemptfrom248CMR5.08(2)(a)
(1 through 4):
1.TheequipmentlistedinChapter10entitled“EquipmentNotRequiredToBe
Vented” in the most current edition of NFPA 54 as adopted by the Board, and
2.Product-approvedside-wall,horizontallyvented,gas-fueledequipment
installed in a room or structure separate from the dwelling, building, or structure
used in whole or in part for residential purposes.
NOTE
For the State of
Massachusetts, use only
plastic piping, ttings
and vent terminations as
specied in this manual
which are approved by the
Massachusetts Board of State
Examiners of Plumbers and
Gas for venting of appliances
(see hyperlink below):
https://licensing.reg.state.
ma.us/pubLic/pl_products/
pb_pre_form.asp

INSTALLATION AND OPERATION INSTRUCTIONS
1-8
TANKLESS WATER HEATER 199
(c) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING
SYSTEM PROVIDED. When the manufacturer of product-approved side-wall,
horizontallyvented,gas-fueledequipmentprovidesaventingsystemdesignor
ventingsystemcomponentswiththeequipment,theinstructionsprovidedby
themanufacturerforinstallationoftheequipmentandtheventingsystemshall
include:
1. Detailed instructions for the installation of the venting system design or the
ventingsystemcomponents;and
2. A complete parts list for the venting system design or venting system.
(d) MANUFACTURER REQUIREMENTS – GAS EQUIPMENT VENTING
SYSTEM NOT PROVIDED. When the manufacturer of product-approved side-
wall,horizontallyvented,gas-fueledequipmentdoesnotprovidethepartsfor
ventingtheuegases,butidenties“specialventingsystems,”thefollowing
requirementsshallbesatisedbythemanufacturer:
1. The referenced “special venting systems” instructions shall be included with
theapplianceorequipmentinstallationinstructions,and
2. The “special venting systems” shall be product-approved by the Board, and
the instructions for that system shall include a parts list and detailed installation
instructions.
(e) A copy of all installation instructions for all product-approved side-wall,
horizontallyvented,gas-fueledequipment,allventinginstructions,allpartslists
for venting instructions, and/or all venting design instructions shall remain with
theapplianceorequipmentatthecompletionoftheinstallation.

1-9
INSTALLATION
TANKLESS WATER HEATER 199
Removal of Existing Unit from Common Venting
When an existing appliance is removed from a common venting system, the
common venting system is likely to be too large for proper venting of the
appliances remaining connected to it.
For each appliance remaining connected to the common venting system, you
must follow the steps below. Before you begin, ensure that any other appliances
connected to the common venting system are not in operation.
••Seal any unused openings in the common venting system.
•Visually inspect the venting system for proper size and horizontal pitch, and
determine that there is no blockage or restriction, leakage, corrosion and
otherdecienciesthatcouldcauseanunsafecondition.
•Insofar as is practical, close all building doors and windows and all doors
between the space in which the appliances remaining connected to the
common venting system are located and other spaces of the building. Turn
on clothes dryers and any appliance not connected to the common venting
system. Turn on any exhaust fans, such as range hoods and bathroom
exhausts, so they will operate at maximum speed. Do not operate a summer
exhaustfan.Closereplacedampers.
•Place in operation the appliance being inspected. Follow the lighting
instructions.Adjustthethermostat,sothattheapplianceoperates
continuously.
• Test for spillage at the draft hood relief opening after 5 minutes of main
burneroperation.Usetheameofamatchorcandle,orsmokefroma
cigarette, cigar, or pipe.
•After it has been determined that each appliance remaining connected to
the common venting system properly vents when tested as outlined above,
returndoors,windows,exhaustfans,replacedampersandanyothergas-
burning appliance to their previous conditions of use.
•Any improper operation of the common venting system should be corrected
so the installation conforms with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54, and/or the Natural Gas and Propane Installation Code, CAN/
CSA B149.1. When resizing any portion of the common venting system, the
common venting system should be resized to approach the minimum size
as determined using the appropriate tables in Chapter 13 of the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane
Installation Code, CAN/CSA B149.1.
NOTE
The ue gas temperature
sensor reports the current
ue gas exhaust temperature
to the unit’s controller. If
necessary, the controller
will reduce the input of the
tankless water heater to
meet the ue gas exhaust
temperature requirements of
PVC material. The controller
locks out the unit if this
temperature is exceeded, and
displays F003.
CAUTION
- The minimum wall thickness
for venting is 1"and the
maximum wall thickness for
venting is 14".
- Do not connect this tankless
water heater to a chimney ue
serving a separate appliance
designed to burn solid fuel.
- The air intake tting can be
moved to the left or to the
right of the exhaust tting.

INSTALLATION AND OPERATION INSTRUCTIONS
1-10
TANKLESS WATER HEATER 199
1.4.1 Applications
All Tankless Water Heaters must be installed as a Direct Vent venting system.
The combustion air must be piped in from the outdoors and connected directly
totheunit’scombustionairconnection.See section 1.4.7 for air intake piping
requirements.
1.4.2 Exhaust Vent Material
Use of ABS, cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) in venting systems is prohibited.
Exhaust Vent Material – CANADA
Use only PVC, CPVC, Polypropylene (PPS), or stainless steel* vent components.
Venting components must be approved for use with a Category IV appliance,
listed under ULC S636 and must comply with CSA B149.1 (latest edition).
•PVC (ULC-S636)
•CPVC (ULC-S636)
•Polypropylene (ULC-S636)
•Stainless steel* (ULC-S636)
Exhaust Vent Material – USA
Use only PVC, CPVC, Polypropylene (PPS), or stainless steel* vent components.
Ventingcomponentsmustbeapprovedbytheauthorityhavingjurisdictionandas
follows:
• PVC (Schedule 40 ASTM D1785)
• CPVC (Schedule 40 ASTM F441)
• Polypropylene (UL1738 / ULC-S636)
• Stainless Steel*(Type BH), DuraVent FasNSeal, HeatFab Saf-T Vent, Z-Flex
Z-Vent
Thisunitisequippedwithatopmounted2”ventconnection.Wetthevent
connection gasket and pipe with clean water prior to assembly. Insert 2” PVC or
CPVC directly into the units vent connection and secure the pipe by tightening
the clamp.
Polypropyleneventingwillrequireanadapterfromtheventingmanufacturer
to transition from the 2” vent connection to the venting system. Centrotherm
InnoFluepolypropyleneventingrequiresadapterpartnumberISAAL0202.Wet
the vent connection gasket and adapter with clean water prior to assembly.
Insert the polypropylene adapter into the units vent connection and secure by
tightening the clamp.
*Manufacturers of stainless steel Type BH venting systems must submit
their approved transition tting to us for evaluation and written approval.
1.4.3 Vent Travel
The maximum exhaust venting length is dependent upon the vent pipe size (2”
or 3”) and the venting material (PVC, CPVC, PPs). See Table 3 for maximum
exhaustventinglengthsandtherequiredventinglengthreductionforeachtting
in the venting system.
Example: When using 6 x 90º CPVC elbows, the maximum lineal measure of
pipeallowedusing3”pipeis72feet(120’–(6x8’=48’)=72’).
WARNING
- Do not mix venting materials
from di󰀨erent venting
manufacturers.
These venting materials are
designed to be installed as
part of a complete system.
Failure to comply may result
in severe personal injury or
death.
- Fully insert the approved
venting material into the
unit’s exhaust outlet and
tighten clamp to ensure the
venting connection is locked
in place.
Figure 7: Inlet and outlet vent
connections. Note the ue
exhaust test port.
NOTE
For the State of
Massachusetts, use only
plastic piping, ttings
and vent terminations as
specied in this manual
which are approved by the
Massachusetts Board of State
Examiners of Plumbers and
Gas for venting of appliances
(see hyperlink below):
https://licensing.reg.state.
ma.us/pubLic/pl_products/
pb_pre_form.asp

1-11
INSTALLATION
TANKLESS WATER HEATER 199
For 3" Flexible PPs, up to 35 actual lineal feet are allowed in a nominally vertical
orientation(>45°).Theequivalentlengthof3"FlexiblePPsiscalculatedusing
amultipleof1.4:1,e.g.35'x1.4=49'equivalent.Thebalanceoftheventing
allowance is still available for use with rigid PPs piping material.
2" Flexible PPs is not allowed.
EXHAUST PIPE SIZE/FITTINGS MAXIMUM EQUIVALENT LENGTH
Schedule 40 PVC, CPVC or PPs – Allowances are for each side separately.
2" 65'65'*
3" 120'
2" or 3" 90° Long Sweep Vent Elbow Allow5equivalentfeet
2" or 3" 90° Short Sweep Vent Elbow Allow8equivalentfeet
2" or 3" 45° Vent Elbow Allow3equivalentfeet
PPS
PPs 87-90° Elbow Allow8equivalentfeet
Flex PPS
2" PPs Flex Not Allowed
3" PPs Flex 35'Actual(Equivalent=Actualx1.4)
Table 3: Maximum Exhaust Venting Length
* The input rate will derate as vent length increases. See table below for
approximate derate at 2" maximum vent length.
MAXIMUM FIRING RATE APPROXIMATE DERATE
199,000 10 - 16%10 - 16%
Follow all installation instructions supplied by the pipe and tting
manufacturer. Prior to assembly, ensure all venting components are clean of
burrs/debris which could clog the fan, burner, and heat exchanger.
General Venting/Piping Requirements
Iftheventlengthrequiresincreasingtheventpipesizeto3",thetransitionfrom
the2"ventconnectorto3"ventingmustoccurwithintherst18"ofthetopofthe
unit and must be done in a vertical section to avoid pooling of condensate. Slope
exhaust venting back towards the unit with a pitch of at least 1/4" per foot. Follow
ventingmanufacturerpitchrequirements,socondensaterunsbacktowardsthe
trap. Support air intake and vent piping per local code and vent manufacturers
requirements.Intheabsenceofsupportrequirements,supporttheairintakeand
vent piping at every vertical and horizontal transition as well as every 5' of run.
Begin the vent system installation at the unit and work towards the outdoor
termination. We recommend using a bird screen of 1/4" stainless steel or plastic
mesh (e.g., IPEX System 636 drain grate for CPVC systems) to guard against
foreignobjects.
BEST PRACTICES
To reduce the possibility of
expansion noise, allow a 1/4"
gap around the exhaust and
air intake piping.
NOTE
The bird screen is optional
for exhaust piping in cold
weather climates.
WARNING
C ombustion air must not be
drawn from areas containing
corrosive air from swimming
pools or spas, including air
directly next to outdoor pools
and spas.
Figure 8

INSTALLATION AND OPERATION INSTRUCTIONS
1-12
TANKLESS WATER HEATER 199
Securejointsusingappropriatesolventcementtobondtherespectivepipe
material (Canada: PVC/CPVC cement approved under ULC-S636, in accordance
with its manufacturer instructions; USA: PVC (ASTM D2564), or CPVC (ASTM
F493).UsetransitioncementanywherethatPVCandCPVCarejoined.Follow
thecementmanufacturer’sinstructionscloselywhenjoiningvariouscomponents.
For PPs, connections must be secured using approved retainer clips supplied by
the respective PPs manufacturer.
Ensurethatallventconnectionsareliquidandpressuretight.Priortoringthe
unit, and before any of the venting run is concealed by the building construction,
youmusttesttheexhaustjoints,usingasoap/watersolution.Youmustllthe
condensate trap before testing.
1.4.4 Venting Passage Through Ceiling and Floor
• Conrmmaterialmeetslocalcodesincludingrestoppingrequirements.
Somelocaljurisdictionsrequirethataminimuminitiallengthofpipebe
exposed or accessible for inspection.
• Pipe clearances best practice allows a minimum 1/4" gap around the pipe to
prevent binding and expansion noise. Follow local codes.
• Allpipingmustbeliquidandpressuretight.
1.4.5 Rooftop Vent Termination
Direct Vent - Two Pipe
Rooftop vents must terminate as follows:
• The exhaust pipe can terminate in an open vertical orientation without concern
aboutraininltration;rainwilldrainawaythroughthecondensatetrap.
• The intake air pipe is not typically drained, so it must be terminated with a down-
turned elbow (see Figure 10). The intake pipe does not need to penetrate the
roofatthesameelevationastheexhaust(asshown);lowerdowntheroofis
OK.
•The air intake pipe may terminate on the side wall of the building as long as
the air intake terminal is turned down and the side wall of the building is not
exposed to large wind loads i.e.: prevailing winds. (see Figure 9)
WARNING
Condensate can cause
corrosion of metal roong
components and other
roong materials. Check
with the builder or roong
contractor to ensure that
materials are resistant to
acidic condensate. pH levels
can be as low as 3.0
[18" (457 mm) Canada] MIN.
NOTE: THE BIRD SCREEN
IS OPTIONAL IN COLD
WEATHER CLIMATES
CAUTION
Vent termination clearances
in this section are code
minimum, or recommended
minimum requirements,
and may be inadequate for
your installation. You must
examine building envelope
details, and take measures to
avoid admission of moisture
into building structures.
Serious structural damage
may occur if adequate
precautions and clearances
are not allowed for.
These precautions are to be
observed for neighboring
structures as well as for
the structure the unit(s) are
installed in.
Figure 10: Rooftop vent terminal congurations
Figure 9: Rooftop vent terminal
congurations