State Water Heaters 110C User manual

Gas Tankless Water HeaterTM
Suitable for combination potable water heating
and space-heating.
Please refer to local codes for space-heating compliance.
FEATURING
 • ENDLESSHOTWATER
 • ON-DEMANDUSAGE
 • COMPACT,SPACESAVING
 • ENERGYCONSERVATION
 • COMPUTERIZEDSAFETY
 • ELECTRONICIGNITION
 • ComplieswithSCAQMDRule
1146.2forLowNOxEmissions
of14ng/Jor20ppm
 • CONCENTRICVENT
 • EASYGASCONVERSION
 • EASY-LINKSYSTEM*
 • MULTI-UNITSYSTEM*
 *(510C model only)
Ifyouhaveanyquestions,please
callorwriteto:
500TennesseeWaltzParkway
AshlandCity,TN37015
TollFree:1-877-737-2840
On-Demand Water Heater
Installation Manual and Owner’s Guide
- Do not store or use 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electric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 performed
byaqualifiedinstaller,serviceagencyorthe
gassupplier.
WARNING
If the information in these
instructions is not followed
exactly,afireorexplosionmay
resultcausingpropertydamage,
personalinjuryordeath.
Models
• 110C
• 310C
• 510C
ANSIZ21.10.3・CSA4.3 510C
modelonly
R
DR

2Page
CONTENTS
Installation Manual
SPECIFICATIONS.......................................................................................................................... 4
INTRODUCTION .......................................................................................................................... 5
SAFETY GUIDELINES.................................................................................................................... 6
INSTALLATION............................................................................................................................. 7
General.....................................................................................................................................7
Clearances................................................................................................................................9
Included accessories................................................................................................................9
Optional items..........................................................................................................................9
Warning for installations........................................................................................................11
High-altitudeinstallations......................................................................................................12
Ventinginstructions...............................................................................................................13
Gas supply and gas pipe sizing...............................................................................................18
Water connections................................................................................................................20
Electrical connections............................................................................................................21
Temperature remote controller............................................................................................22
Easy-Link System....................................................................................................................24
Multi-UnitSystem..................................................................................................................26
APPLICATIONS............................................................................................................................27
INITIAL OPERATION...................................................................................................................29
Owner's Guide
OPERATING SAFETY .................................................................................................................. 31
NORMAL OPERATION ............................................................................................................... 33
General..................................................................................................................................33
Temperaturesettings.............................................................................................................34
Flow.......................................................................................................................................37
Freeze protection system.......................................................................................................37
Maintenance and service.......................................................................................................38
Unit draining and filter cleaning............................................................................................38
TROUBLESHOOTING...................................................................................................................39
General...................................................................................................................................39
Error codes............................................................................................................................41
COMPONENTS DIAGRAM..........................................................................................................44
PARTS LIST..................................................................................................................................48
OUTPUT TEMPERATURE CHART....................................................................................................50
LIMITED WARRANTY..................................................................................................................51
Contents

3Page
Installaon Manual
Installation Manual
CONGRATULATIONS
Congratulations and thank you for choosing our tankless water heater.
Before use, we recommend that you read through this safety manual
carefully. Please refer to the back of the manual for details about the
warranty. Keep this manual for future reference.
If you lose the manual, contact the manufacturer or your local
distributor or download from the manufacturer's website. When you
call, please tell us the product name and the serial number of your unit
written on the rating plate of the water heater.

4Page
Model 110C 310C 510C
Natural Gas Input
(Operating Range) BTU/h Min.: 15,000 Max.: 140,000
Min.: 15,000
Max.: 190,000
Min.: 15,000
Max.: 199,000
Gas Connection 3/4" NPT
Water Connections 3/4" NPT
Water Pressure* psi
(Mpa) 15 - 150 (0.1 - 1)
Natural gas
Inlet Pressure
" W.C.
(kPa)
Min. 5.0 (1.24)
Max. 10.5 (2.61)
Weight lbs. (kg) 51 (23)
Dimensions inch H 20.5 x W 13.7 x D 10.5
H 520 x W 350 x D 266
mm
Ignition Electric Ignition
Electric
Supply VAC / Hz 120 / 60
Consumption
Operation W / A 53 / 0.58 71 / 0.81 72 / 0.85
Standby W / A 2 / 0.06 2 / 0.06 3 / 0.07
Freeze-
Protection W / A 99 / 0.83 99 / 0.83 100 / 0.83
SPECIFICATIONS
*Maximum flow may need water pressure equal to or above 40 psi.
NOTE:
• Checktheratingplatetoensurethisproductmatchesyourspecifications.
• InaccordancewithANSIZ21.10.3,COemissiondoesnotexceed400PPMfornormalinput.
• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs
without notice and without incurring obligations.
Specicaons
Installaon Manual

5Page
INTRODUCTION
• This manual provides information necessary for the installation, operation, and maintenance
of the water heater.
• The model description is listed on the rating plate which is attached to the side panel of the
water heater.
• Please read all installation instructions completely before installing this product.
• If you have any problems or questions regarding this equipment, consult the manufacturer or
its local representative.
• This appliance is an on-demand, tankless water heater. It is designed to efficiently supply
endless hot water for your needs.
• The 110C, 310C, and 510C models are only to be installed indoors with concentric venting.
• The principle behind tankless water heaters is simple:
*This diagram illustrates tankless water heater design concepts only and does not accurately represent
the water heater’s physical description.
1. A hot water fixture is turned on.
2. Water flows through the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and gas valve to let gas flow through the heater and sends a
signal to the igniter to create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water is heated as it flows through the heat exchanger.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates
the gas and water valves to ensure proper output water temperature and hot water outflows.
8. When the fixture is turned off, the unit shuts down.
Introducon
Installaon Manual
Burners
Hotwaterxture
Exhaust vent and
combusonairintake
collar
Heat exchanger
Gas valves
Fan motor
Flow adjustment valve
Computer board
Thermistor
Cold water inlet
Hot water outlet Gas inlet
Thermistor
Burners
Flow sensor
Igniter
1
2
3
4
54
6
7
7
7
84
4

6Page
SAFETY GUIDELINES
SAFETY DEFINITION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel Gas Code:
ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1,NaturalGasandpropaneinstallationcodeinCanada.
2. Properly ground the unit in accordance with all local codes or in the absence of local codes, with the current
edition of the National Electrical Code: ANSI/NFPA 70 in the USA or CSA standard C22.1 Canadian Electrical
Code Part 1 in Canada.
3. Carefully plan where you intend to install the water heater. Please ensure:
• Your water heater will have enough combustion air and proper ventilation.
• Locate your heater where water leakage will not damage surrounding areas. (Please refer to p. 8.)
4. Check the rating plate for the correct GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC RATING. If
this unit does not match your requirements, do not install and consult with the manufacturer. The water
heater is configured only for use with Natural Gas at the factory. If the appliance is used with propane gas,
conversion to propane gas with an included conversion kit (LP Conversion Kit: 319143-580) is required. The
conversion must be done by a qualified service agent or a gas utility serviceman in accordance with this
instruction and all codes and requirements of the authority having jurisdiction. Failure to follow instructions
could result in serious injury or property damage. The agent performing this work assumes responsibility for
this conversion. (Refer to the gas conversion leaflet.)
5. If any problem should occur, turn off all hot water fixtures and turn off the gas. Then call a trained technician
or the Gas Company or the manufacturer.
WARNING
• Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from
scalding. The water temperature is set at 120 °F (50 °C) from the factory to minimize any
scalding risk. Before bathing or showering always check the water temperature.
• Do not store or use gasoline or other flammables, vapors, or liquids in the vicinity of this
appliance.
• Do not reverse the water and/or gas connections as this will damage the gas valves and
can cause severe injury or death. Follow the diagram on p. 20 when installing your water
heater.
• The conversion to propane must be done by a qualified service agent or a gas utility
serviceman in accordance with this instruction and all codes and requirements of the
authority having jurisdiction. Failure to follow instructions could result in serious injury
or property damage. The qualified agent performing this work assumes responsibility
for this conversion.
• Do not use this appliance if any part has been in contact with or been immersed in
water. Immediately call a licensed plumber, a licensed gas fitter, or a professional service
technician to inspect and/or service the unit if necessary.
• Do not disconnect the electrical supply if the ambient temperature will drop below
freezing. The Freeze Protection System only works if the unit has electrical power. The
warranty will not be covered if the heat exchanger is damaged due to freezing. Refer to
the section on the Freeze Protection System on p. 37 for more information.
Safety Guidelines
Installaon Manual
WARNING
Indicates an imminently hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION
Indicates an imminently hazardous situation which, if not avoided, could
result in minor or moderate injury.
Indicates an imminently hazardous situation which, if not avoided, will result
in death or serious injury.
DANGER

7Page
INSTALLATION
GENERAL
1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel
GasCode:ANSIZ223.1/NFPA54intheUSAorCAN/CSAB149.1,NaturalGasandpropaneinstallation
code in Canada.
2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.
This manual must be followed exactly. Read the “Safety Guidelines” section.
3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need
adjustment.
4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily.
Refer to the "Clearances" section on p. 9 for proper clearances.
5. The electrical connection requires a means of disconnection, to terminate power to the water heater
for servicing and safety purposes.
6. Do not install the unit where the exhaust vent is pointing into any opening in a building or where the
noise may disturb your neighbors. Make sure the vent termination meets the required distance by
local code from any doorway or opening to prevent exhaust from entering a building. (Refer to p. 11,
16, and 17.)
7. Carefully plan the installation location of the heater and vent terminations. Particles from flour,
aerosols, lint, and other contaminants may clog the air intake. This could reduce the operation of the
fan causing improper combustion and reduced life of the water heater. Ensure that the area around
the heater and vent termination is free of dust and debris. Regular maintenance is recommended is
environments with these items in the air.
8. For the 110C, 310C, and 510C models: A condensate collector and trap (100266140 & 100266139)
are required to be installed in the venting system when there is more than 8 feet (2.4 m) of equivalent
vent length, not including the sidewall termination. 87° elbow is equivalent to 5 ft. (1.5 m) of vent
length. The condensate collector must be installed on the heater's flue. The condensate trap and
collector are required on all vertical installations.
Installaon
Installaon Manual

8Page
• Installation and service must be performed by a qualified installer (for
example, a licensed plumber or gas fitter). Otherwise, the warranty will be
void.
• The installer (licensed professional) is responsible for the correct installation
of the water heater and for compliance with all national, state / provincial,
and local codes.
• The manufacturer does not recommend installing the water heater in a pit or
location where gas and water can accumulate.
• Do not have the vent terminal pointing toward any operating window, door, or
opening into a building.
• Do not install next to any source of airborne debris, such as a clothes dryer, that
can cause debris to be trapped inside the unit cabinet.
• The manufacturer does not suggest installing the water heater in an attic due
to safety issues. If you install the water heater in an attic:
• Make sure the unit will have proper ventilation.
• Keep the area around the water heater and its termination clean. When
dust collects on the flame sensor, the water heater will shut down and
produce an error code.
• Place the unit for easy access for service and maintenance.
• A drain pan, or other means of protection against water damage, is
recommended to be installed under the water heater in case of leaks. The
manufacturer is not responsible for damage due to water leak.
WARNING
• The warranty will not cover damage caused by water quality.
• Only potable water or potable water / glycol mixtures can be used with
this water heater. Do not introduce pool or spa water, or any chemically
treated water into the water heater.
• Water hardness levels must not exceed 7 grains per gallon (120 ppm) for
single family domestic applications or more than 4 grains per gallon (70
ppm) for all other types of applications. Water hardness leads to scale
formation and may affect / damage the water heater. Hard water scaling
must be avoided or controlled by proper water treatment.
• Water pH levels must be between 6.5 and 8.5.
• Well water must be treated.
• Do not install the unit where water, debris, or flammable vapors may get into
the flue terminal.
• Although the water heater is designed to operate with minimal sound, the
manufacturer does not recommend installing the unit on a wall adjacent to a
bedroom, or a room that is intended for quiet study or meditation, etc.
• Locate your heater close to a drain where water leakage will not do damage
to surrounding areas. As with any water heating appliance, the potential for
leakage at some time in the life of the product does exist. The manufacturer
will not be responsible for any water damage that may occur. If you install a
drain pan under the unit, ensure that it will not restrict the combustion air flow.
CAUTION
Installaon
Installaon Manual

9Page
Maintain all clearances around
the water heater.
CLEARANCES
Model Top Bottom Front Back Sides
110C
310C
510C
12 in.
(305 mm)
12 in.
(305 mm)
4 in.*
(102 mm)
1 in.
(25 mm)
3 in.
(76 mm)
*24 inches (610 mm) recommended for maintenance.
OPTIONAL ITEMS
#Model 110C 310C 510C
1. Condensate collector (100266140)
and trap (100266139) ✓ ✓ ✓
2. Concentric Sidewall Termination Kit ✓ ✓ ✓
3. Concentric Roof Termination ✓ ✓ ✓
4Elbow ✓ ✓ ✓
5. Straight Pipe ✓ ✓ ✓
6. Roof Flashing ✓ ✓ ✓
7. Pipe Hanger ✓ ✓ ✓
8. Remote controller (9009069005) ✓ ✓ ✓
INCLUDED ACCESSORIES
Installaon
Installaon Manual
Top
Back
Side
Side
Front
Boom
Check that these items below are included with the water heater.
Installation manual
and Owner’s guide
Communication cable
510C model only LP Conversion Kit (319143-580)
Qty: 1
Qty: 1 Manifoldaachment:2Small/1Large
Manifold gasket (319143-581): 1
Gasconversionscker:1
Gasconversioninstrucon:1
(319143-581)
(320273-585)

10 Page
1. Condensate Collector and Trap
3. Concentric Roof Termination
Installaon
Installaon Manual
7. Pipe Hanger (100266141)
4. Elbow
8. Remote controller
9009069005 (TM-RE42)
This remote can be added to the
heater, in addition to the built-in
controller.
Collector
(100266140)
Trap
(100266139)
It includes: One Sidewall Termination, One 87° Elbow,
Two Wall Plates.
5. Straight Pipe
10" (254 mm) Straight Pipe :(100266133)
19.5" (495 mm) Straight Pipe :(100266134)
39" (991 mm) Straight Pipe :(100266135)
6. Roof Flashing
Flatroof Flashing
(100266187)
2. Concentric Sidewall Termination Kit
11 1/2" (292mm)
(100266115)
21" (533 mm)
(100266117)
38" (965 mm) Roof Termination
(100266118)
Tile / Shingle Roof Flashing
1/12 to 6/12 Pitch (100266136)
8/12 to 16/12 Pitch (100266137)
6/12 to 12/12 Pitch (100266138)
45° Elbow
(100266119)
87° Elbow
(100266132)

11 Page
FOR YOUR SAFETY, READ BEFORE INSTALLATION:
Do not install the water heater or vent
termination next to a dryer or dryer vent. The
water heater environment must be free from
any source of airborne debris that can be
trapped inside the water heater.
Installaon
Installaon Manual
Water heater vent terminator must be at least 2 ft.
(61 cm) away from an inside corner.
WARNING FOR INSTALLATIONS
• Do not install the water heater and its termination where water,
debris or flammable vapors may get into the water heater and
flue terminal. This may cause damage to the heater and void the
warranty.
• Do not have the vent terminal pointing toward any opening into a
building.
• Do not locate your heater in a pit or location where gas and water
can accumulate.
Prohibited
1 . (30 cm) min. USA
3 . (91 cm) min. Canada
1 . (30 cm) min. USA
3 . (91 cm) min. Canada
1 . (30 cm) min. USA
3 . (91 cm) min. Canada
12-inches (30.48 cm) above grade
or ancipated snow level
Ancipated snow level
Do not install the water heater vent
terminator within 1 ft. (30 cm) in
the USA of any air intake or building
opening, and within 3 ft. (91 cm) in
Canada of any air intake or building
opening.
Inside
corner
2 ft.
(61 cm)
min.

12 Page
HIGH-ALTITUDE INSTALLATIONS
Check the altitude where your water heater is installed. Set DIP switches shown in the table below. The
DIP switch settings are depending on the altitude.
WARNING
• The black squares indicate the positions of the DIP switches for high altitude
installation.
The 110C and 310C : Only adjust DIP switch No. 3, No. 4, and No.5.
The 510C : Only adjust DIP switch No. 2, No. 3, and No. 4 on the lower bank.
• DO NOT adjust the other DIP switches for high altitude installation.
Bank of DIP switches
110C and 310C models
Computer board
Lower bank of DIP switches
510C model
Computer board
Installaon
Installaon Manual
Installation altitude
The maximum certified or allowable installed altitude is 10,100 ft. (3,078 m) for
CV models
0 to 2,000 ft.
(0 to 609 m)
DEFAULT
2,001 ft. to
3,000 ft.
(610 m to
914 m)
3,001 ft. to
5,000 ft.
(915 m to
1,524 m)
5,001 ft. to
7,500 ft.
(1,525 m to
2,286 m)
7,501 ft. to
10,100 ft.
(2,287 m to
3,078 m)
110C and
310C models No. 3 : OFF
No. 4 : OFF
No. 5 : OFF
No. 3 : OFF
No. 4 : ON
No. 5 : OFF
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
No. 3 : OFF
No. 4 : ON
No. 5 : ON
No. 3 : ON
No. 4 : ON
No. 5 : ON
510C model
(Lower bank of
DIP switches) No. 2 : OFF
No. 3 : OFF
No. 4 : OFF
No. 2 : OFF
No. 3 : ON
No. 4 : OFF
No. 2 : OFF
No. 3 : OFF
No. 4 : ON
No. 2 : OFF
No. 3 : ON
No. 4 : ON
No. 2 : ON
No. 3 : ON
No. 4 : ON
Altitude
Model
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
1 2 3 4 5 6 7 8 9 10
OFF
ON
12345678910
OFF
ON
12345678910
OFF
ON
12345678910

13 Page
• Improper venting of this appliance can result in excessive levels of carbon
monoxide which can result in severe personal injury or death.
• Improper installation can cause nausea or asphyxiation, severe injury or death
from carbon monoxide and flue gases poisoning. Improper installation will
void product warranty.
DANGER
When installing the vent system, all applicable national and local codes must be
followed. If you install thimbles, fire stops or other protective devices and they
penetrate any combustible or noncombustible construction, be sure to follow all
applicable national and local codes.
CAUTION
Installaon
Installaon Manual
VENTING INSTRUCTIONS
-General-
The water heater must be vented in accordance with the section “Venting of Equipment" of the current
editionoftheNationalFuelGasCode:ANSIZ223.1/NFPA54intheUnitedStatesand/orSection7ofthe
CAN/CSA B149.1 Natural Gas, propane installation code in Canada, as well as applicable local building codes.
The water heater is designed for a concentric venting system, which uses one pipe system with two
ducts for combustion air and exhaust air. The manufacturer approves the use of Centrotherm Eco
Systems Direct Vent APNC35 venting systems on new installations. This system is furnished through
the heater manufacturer. See the table below for certified vent terminations.
General rules for venting water heaters:
• Place the water heater as close as possible to the vent termination.
• Do not weld the vent pipe to the water heater’s vent collar.
• Do not cut the vent collar of the unit.
• The vent must be easily removable from the top of the water heater for normal service and
inspection of the unit and vent system.
• The water heater vent must not be connected to any other gas appliance or vent stack.
• Avoid using an oversized vent pipe or using extremely long runs of the pipe.
• Do not common vent or connect any vent from other appliances to the water heater vent.
• The vent should slope towards the heater and condensate collector (100266139). The
condensate trap (100266140) must be installed below the condensate collector's drain nipple to
keep condensate from draining back into the heater's exhaust and causing damage. Condensate
is corrosive and should be treated and disposed of according to local codes.
General rules for vent terminations:
• Avoid locating the water heater vent termination near any air intake devices. These fans can
pick up the exhaust flue products from the water heater and return them to the building. This
can create a health hazard.
• Locate the vent termination so that it cannot be blocked by any debris, at any time. Most codes
require that the termination must be at least 12 in. (305 mm) above grade and anticipated snow
line, but the installer may determine if it should be higher depending on the job site condition
and applicable codes.
• A proper sidewall termination is recommended when the water heater is vented through a
sidewall.
• Regarding the clearances from the exhaust termination to the air inlet or opening, refer to
p 11, 16, and 17.
Use Vent Brand Description Model Number
New Installation
(New Venting)
Centrotherm
Eco Systems
Direct Vent
APNC35
11-1/2" Concentric, Sidewall Termination Kit 100266115
21" Concentric, Sidewall Termination Kit 100266117
38" Roof Termination 100266118

14 Page
-Vent length and No. of Elbows-
This is a Category III appliance and must be vented accordingly. For best results, a vent system should be
as short and straight as possible.
• This water heater is a Category III appliance and must be vented accordingly with concentric
vent approved for use with Category III or Special BH type gas vent.
• Follow the vent pipe manufacturer's instructions and the instructions in this manual when
installing the vent pipe.
• Do not common vent this appliance with any other vented appliance. (Do not terminate vent
inside a chimney. If the vent must go through the chimney, it must run through the top of the
chimney and terminate with the roof termination listed on page 10. Install per the vent manu-
facturer's instructions.)
• When the horizontal vent run exceeds 5 ft. (1.5 m), support the vent run at 3 ft. (0.9 m) intervals
with overhead hangers.
• The maximum length of exhaust vent piping must not exceed 43 ft. (13.1 m) (deducting 5 ft. (1.5
m) for each 87° elbow used in the venting system). Do not use more than 4 pieces of 87° elbows.
-DIP switch settings for Vent length-
Vent type Diameter Max. No. of
87° Elbows
Max. Vertical and
Horizontal (Total)
Vent Length
Concentric 3 in. / 5 in.
(80 mm / 125 mm) 443 ft. (13.1 m )
For each 87° elbow added, deduct 5 ft. (1.5m) from max. vent
length. Two 45° elbows are equivalent to one 87° elbow.
No. of 87°
Elbows
Max. Vertical
or Horizontal Vent Length
043 ft. (13.1 m)
138 ft. (11.6 m)
233 ft. (10.1. m)
328 ft. (8.5 m)
423 ft. (7.0 m)
Excludes the Concentric termination
0 to 10 ft.
(0 to 3 m)
DEFAULT
11 to 20 ft.
(3.1 to 6.1 m)
21 to 30 ft.
(6.2 to 9.1 m)
31 to 43 ft.
(9.2 to 13.1 m)
110C
and
310C
models
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : OFF
No. 7 : OFF
No. 8 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : ON
No. 7 : OFF
No. 8 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : OFF
No. 7 : ON
No. 8 : ON
OFF
ON
1 2 3 4 5 6 7 8 9 10
No. 6 : ON
No. 7 : ON
No. 8 : ON
510C
model
(Upper bank
of DIP
switches)
1 2 3 4 5 6 7 8
OFF
ON
No. 3 : OFF
No. 4 : OFF
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : ON
No. 4 : OFF
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : OFF
No. 4 : ON
No. 5 : ON
OFF
ON
1 2 3 4 5 6 7 8
No. 3 : ON
No. 4 : ON
No. 5 : ON
Installaon
Installaon Manual
WARNING
• The black squares indicate the positions of the DIP switches for vent length.
For the 110C and 310C : Only adjust DIP switch No. 6 , No. 7, and No. 8.
For the 510C : Only adjust DIP switch No. 3, No. 4, and No. 5 on the upper bank.
• DO NOT adjust the other DIP switches for vent length.
Vent
length
Model

15 Page
Venng Illustraons-
For the 110C, 310C and 510C models
For details of the venting installation, refer to the Centrotherm Eco Systems Direct Vent APNC35 concentric
venting installation manuals.
Installaon
Installaon Manual
Horizontal Installation
Vertical Installation
Standard Sidewall kit
11.5" (292 mm):100266115
21" (533 mm):100266117
Condensate Trap &
Collector
100266139&100266140
Straight Pipe
10" (254 mm) : 100266133
19.5" (495 mm) : 100266134
39" (990 mm) : 100266135
Elbow
87° :100266132
Condensate Trap &
Collector
100266139&100266140
Roof termination
100266118
Tile / Shingle Foof Flashing
1/12 to 6/12 pitch: 100266136
8/12 to 16/12 pitch: 100266137
6/12 to 12/12 pitch: 100266138
Straight Pipe
10" (254 mm) : 100266133
19.5" (495 mm) : 100266134
39" (990 mm) : 100266135
Pipe Hanger
100266141
Pipe Hanger
100266141

16 Page
-Vent terminaon clearances-
Canada U.S.A
Direct-vent Direct- vent
AClearance above grade, veranda, porch, deck, or bal-
cony 1 foot (30 cm) 1 foot (30 cm)
B Clearance to window or door that may be opened 3 feet (91 cm) 1 foot (30 cm)
CClearance to permanently closed window * *
D
Vertical clearance to ventilated soffit located above
the vent terminator within a horizontal distance of 2
feet (61cm) from the center line of the terminator
* *
EClearance to unventilated soffit * *
FClearance to outside corner * *
GClearance to inside corner 2 feet (61 cm) 2 feet (61 cm)
HClearance to each side of center line extended above
meter/regulator assembly 3 feet (91 cm) *
IClearance to service regulator vent outlet 3 feet (91 cm) *
J
Clearance to non-mechanical air supply inlet to build-
ing or the combustion air inlet to any other applica-
tion
3 feet (91 cm) 1 foot (30 cm)
KClearance to mechanical air supply inlet. 6 feet (1.83 m) 3 feet (91 cm)
LClearance above paved sidewalk or paved driveway
located on public property 7 feet (2.13 m) *
MClearance under veranda, porch deck, or balcony 1 foot (30 cm) *
*ForclearancesnotspecifiedinANSIZ223.1/NFPA54orCAN/CSA-B149.1,pleaseuseclearancesinaccordance
with local installation codes and the requirements of the gas supplier.
INSIDE CORNER DETAIL
V
Gas meter / regulator
V
V
V
V
V
V
V
V
V
X
X
X
Vent terminal
Air supply inlet
Area where is not permitted
G
A
E
D
B
L
C
F
B
B
B
BA
J
OPERABLE FIXED
CLOSED
B
H
M
K
OPERABLE
FIXED
CLOSED
I
Installaon
Installaon Manual

17 Page
-For sidewall terminaons-
-For rooop terminaons-
For multiple-unit, concentric wall terminals space each
concentric wall terminal at least 1 ft. (30 cm) away from
each other, no matter the orientation. A concentric wall
terminal must also be at least 2 ft. (61 cm) away from an
inside corner. (If the adjacent wall is less than 2 ft. (61 cm)
of length, the minimum required distance away from the
inside corner will be equal to the length of that adjacent
wall.)
For multiple-unit rooftop terminations, space all exhaust and intake terminations in accordance with local
codes. An exhaust termination must be spaced from a wall or surface in accordance with local codes as
well. In the absence of such a code, an exhaust termination must be a horizontal distance of at least 2 ft.
(61 cm) away from a wall or surface.
Concentric wall terminals should
be at least 2 ft. (61 cm) away
from an opposite surface/wall.
Do not place the termination
directly in front of an opening
into a building.
Concentric wall terminals should
be at least 3 ft. (91 cm) away from
a ventilated or unventilated soffit.
Please follow all local and national codes in regards to proper termination
clearances. In the absence of such codes, the above clearances can be used as
guidelines. Local codes supersede these guidelines EXCEPT in cases where they
are less restrictive. In such cases, the minimum clearances listed in this manual
must be maintained.
CAUTION
A: In accordance with local codes
Air intake
A
Exhaustterminaon
A
A
A
A
2.
(61 cm)
min.
Air intake
Exhaust
terminaon
Installaon
Installaon Manual
Inside
corner
Concentric
termination
1 ft.
(30 cm)
min.
2 ft.
(61 cm)
min.
1 ft. (30 cm)
min.
2 ft.
(61 cm)
min.
3 ft. (91 cm) min.

18 Page
GAS SUPPLY AND GAS PIPE SIZING
-General-
• The minimum and maximum inlet gas pressures
• Inlet gas pressures that fall outside the range of values listed above may adversely affect the
performance of the water heater. These pressures are measured when the water heater is in full
operation.
• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range
will cause dangerous operating conditions and damage to the unit.
• Until testing of the main gas line supply pressure is completed, ensure the gas line to the water heater
is disconnected to avoid any damage to the water heater.
• If the gas supply pressure to the heater is greater than the specified maximum, a field-supplied
regulator is required. The regulator must lower the gas pressure within the approved range.
• Install the gas regulator according to the manufacturer's instructions.
• The regulator must be sized for the water heater input and provide the specified pressures that
are listed on the rating plate.
• In the absence of minimum install distance, it is recommended that the gas regulator be installed
no closer than 3 ft. (1 m) from the water heater's inlet gas connection.
-Gas connecons-
1. Install a full port, manual gas shutoff valve between the water heater and the gas supply line.
2. When the gas connections are completed, it is necessary to perform a gas leak test either by applying
soapy water to all gas fittings and observing for bubbles or by using a gas leak detection device.
• The water heater and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of 1/2 psi
(3.5 kPa).
• The water heater must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.5 kPa).
3. Always purge the gas line of any debris and/or water before connecting to the gas inlet.
Size the gas pipe to supply the necessary volume of gas for the water heater. Refer
toandfollowtherequirementslistedinthecurrenteditionofANSIZ223.1/NFPA
54 (USA), CAN/CSA B149.1 (Canada), or local codes. Otherwise, flow capabilities
and output temperatures will be limited.
NOTICE
Gas type Inlet gas pressure
Natural Gas Min. 5.0” W.C. (1.24 kPa) – Max. 10.5” W.C. (2.61 kPa)
Propane Min. 8.0” W.C. (1.99 kPa) – Max. 14.0” W.C. (3.48 kPa)
• Do not use this water heater with any gas other than the one listed on the
rating plate unless the water heater has been properly converted.
• Ensure that any and all gas regulators used are operating properly and
providing gas pressures within the specified range shown below. Excess gas
inlet pressure may cause serious accidents.
• If your water heater needs a gas conversion, refer to the instructions supplied
with the heater and included with the conversion components.
Installaon
Installaon Manual
WARNING

19 Page
Based on Energy
Content of 1,000
BTU/Cubic ft:
Divide each
appliance's BTU/h
requirement by
1,000 BTU/ft3to get
the appliances ft3/h
requirement.
Take into account
the distance the
appliance is from
the gas meter, then
look in the above
gas chart to properly
size the line.
For sections of the
gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft. per hour requirements
of the appliances that are being supplied by that section, and size to the farthest appliance.
For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements
and dividing by 1,000 yields a cubic ft. per hour requirement of 220 cubic ft. of gas per hour. The farthest appliance
is the range, which is 50 ft. (15.2 m) away from the meter. According to the chart above, the 50-ft. (15.2 m) column
shows that Section A to B must be 1" in order to supply 220 cubic ft per hour.
Water
heater
199,000 BTU/h Dryer
35,000 BTU/h
Gas meter Furnace
120,000 BTU/h
Range
65,000 BTU/h
AB
C
10' (3.1 m) Length
1/2" Pipe size
15' (4.6 m) Length
1/2" Pipe size
15' (4.6 m) Length
1" Pipe size
10' (3.1 m) Length
3/4" Pipe size
10' (3.1 m) Length
1" Pipe size
5' (1.5 m) Length
1-1/4" Pipe size
10' (3.1 m) Length
3/4" Pipe size
5' (1.5 m) Length
1-1/4" Pipe size
Gas sizing example
(Natural Gas)
Installaon
Installaon Manual
Pipe Size Length: ft. (m)
Diameter:
in.
10'
(3.0)
20'
(6.1)
30'
(9.1)
40'
(12.2)
50'
(15.2)
60'
(18.3)
70'
(21.3)
80'
(24.4)
90'
(27.4)
100'
(30.5)
125'
(38.1)
150'
(45.7)
200'
(61.0)
1/2" 172 118 95 81 72 65 60 56 52 50 44 40 34
3/4" 360 247 199 170 151 137 126 117 110 104 92 83 71
1" 678 466 374 320 284 257 237 220 207 195 173 157 134
1 1/4" 1,309 957 768 657 583 528 486 452 424 400 355 322 275
1 1/2" 2,090 1,430 1,150 985 873 791 728 677 635 600 532 482 412
2" 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020 928 794
Unit: Cubic feet per hour
-Natural Gas Supply Piping-
Maximum delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe carrying Natural Gas with 0.60 Specific Gravity
Based on Pressure Drop of 0.5" W.C.
Based on Energy Content of 1,000 BTU/Cubic ft.: The water heater requires 140 Cubic ft./hr for the 110C, 190
Cubic ft./hr for 310C, and 199 Cubic ft./hr for the 510C model.
Unit: kBTU per hour
Pipe Size Length: ft. (m)
Diameter 10'
(3.0)
20'
(6.1)
30'
(9.1)
40'
(12.2)
50'
(15.2)
60'
(18.3)
70'
(21.3)
80'
(24.4)
90'
(27.4)
100'
(30.5)
125'
(38.1)
150'
(45.7)
200'
(61.0)
1/2" 268 184 148 126 112 101 93 87 82 77 68 62 53
3/4" 567 393 315 267 237 217 196 185 173 162 146 132 112
1" 1,071 732 590 504 448 409 378 346 322 307 275 252 213
1 1/4" 2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511 440
1 1/2" 3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787 675
2" 6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496 1,260
-Propane (LP) Supply Piping-
Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop

20 Page
-Measuring inlet gas pressure-
The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions
on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
Installaon
Installaon Manual
1. Shut off the manual gas valve on the gas supply line.
2. Remove the screw for the pressure port located on the gas inlet of the water
heater shown in the diagram on the right.
3. Connect the manometer to the pressure port.
4. Re-open the manual gas valve. Verify that there are not any gas leaks.
5. With all gas burning equipment off, take a reading of the static gas pressure.
6. Measure gas supply pressure at maximum heater operation: Open up water
faucets to create maximum flow. Take a reading of the supply dynamic gas
pressure with all gas burning equipment running at maximum rate.
7. The static and dynamic pressures should be within the ranges specified on
the heater's rating plate and the table on page 18.
8. The difference of static to dynamic pressure should not exceed 1.5" W.C.
Pressure drops that exceed 1.5" W.C. can indicate restricted gas flow, under-
sized gas lines, and/or undersized supply regulators.
9. Measure gas supply pressure at minimum heater operation: Reduce water
flow so the heater is running at minimal operation. Take a supply gas pres-
sure reading and verify that it is within the specified inlet gas pressure range.
1. Turn off all electric power to the water heater if service is to be performed.
2. Turn the manual gas valve located on the outside of the unit clockwise to the off position.
WARNING
WATER CONNECTIONS
• Do not use this water heater if any part has been submersed under water. Immediately
call a licensed professional to inspect the water heater to replace any damaged parts.
• Do not reverse the hot outlet and cold inlet connections to the water heater. This will
not properly activate the water heater.
CAUTION
4. Before installing the water heater, flush the
water line to remove all debris, and after
installation is complete, purge the air from
the line. Failure to do so may cause damage
to the water heater.
5. There is a wire mesh filter within the cold
inlet to trap debris from entering your heater.
This will need to be cleaned periodically to
maintain optimum flow. (Refer to p. 38.)
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for
potable water systems.
1. A manual shutoff valve must be installed on the cold water inlet to the water heater between the
main water supply line and the water heater.
2. In addition, a manual shutoff valve is also recommended on the hot water outlet of the unit.
Isolation valves are available.
Cold
inlet
Hot
outlet
Gas
inlet
As Close as
Possible
Pressure relief
valve
3. If the water heater is installed within, or subjected to, a
closed loop water system, a thermal expansion tank or
a code approved device to handle thermal expansion
must be installed.
Pressure
port