Bosch Greentherm 9800 SEO 160 User manual

Installation and Operating Instructions
Temperature Modulated with Electronic Ignition Suitable for heating potable water and space heating
(Intended for variable flow applications)
FOR OUTDOOR INSTALLATIONS ONLY
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Danger: If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
Installation and service must be performed by a trained and certified installer, service
agency or the gas supplier.
Improper installation, adjustment, alteration, service or maintenance can cause
injury or property damage. Refer to this manual. For assistance or additional informa-
tion consult a qualified installer, service agency or the gas supplier.
Upon completion of the installation, these instructions should be handed to the user
of the appliance for future reference.
What to do if you smell gas
• Turn off the gas shut-off valve. Open windows and door if smell detected inside
the house.
• Do not try to light any appliance.
• Do not touch any electrical switch, telephone, and do not use outlets.
• Extinguish all open flames. Do not smoke! Do not use lighters!
• Warn all occupants of the building. Do not ring doorbells!
• If you can hear gas leaking, leave the building immediately. Prevent others from
entering the building and notify the police and fire department from outside the
building.
• From outside the building, call the gas utility company and a trained and certified
installer.
160 000/199 000 Btu- Natural Gas | 160 000/199 000 Btu - Liquefied Petroleum (LP) Gas
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2 | Table of contents
Table of contents
1 Key to symbols and safety instructions . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety instructions . . . . . . . . . . . . . . . . . . . . 3
2 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Appliance details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Specifications (Technical data) . . . . . . . . . . 7
3.3 Unpacking the heater . . . . . . . . . . . . . . . . . . 9
3.4 General rules to follow for safe operation . 10
3.5 Dimensions and minimum installation
clearances . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Installation tools . . . . . . . . . . . . . . . . . . . . . 12
4.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Proper location for installing your heater . 12
4.4 Selecting heater location . . . . . . . . . . . . . . 13
4.5 Mounting instructions . . . . . . . . . . . . . . . . . 13
4.6 Factory regulation . . . . . . . . . . . . . . . . . . . . 14
5 Installation for modular homes . . . . . . . . . . . . . . . . 15
5.1 Mounting installation for modular homes . 15
6 Installation instructions . . . . . . . . . . . . . . . . . . . . . . 15
6.1 Gas piping & connections . . . . . . . . . . . . . 15
6.2 Water quality . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Water connections . . . . . . . . . . . . . . . . . . . 19
6.4 Domestic hot water recirculation
with external pump . . . . . . . . . . . . . . . . . . . 21
6.5 Space heating applications . . . . . . . . . . . . . 22
6.6 Measuring gas pressure . . . . . . . . . . . . . . . 25
7 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 Electrical power supply . . . . . . . . . . . . . . . . 25
7.2 Position of the fuses in control unit . . . . . . 26
8 Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . 27
8.1 Digital display - description . . . . . . . . . . . . 27
8.2 For your safety read before operating your
water heater . . . . . . . . . . . . . . . . . . . . . . . . 27
8.3 Switching the appliance on/off . . . . . . . . . 27
8.4 Temperature control . . . . . . . . . . . . . . . . . . 28
8.5 Programming the default setpoint
temperature . . . . . . . . . . . . . . . . . . . . . . . . .29
9 Maintenance and service . . . . . . . . . . . . . . . . . . . . . 29
9.1 Annual maintenance . . . . . . . . . . . . . . . . . . 29
9.2 Winterizing for seasonal use . . . . . . . . . . . . 30
9.3 Mineral scale build-up . . . . . . . . . . . . . . . . . 30
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.2 Burner does not ignite when a hot water
faucet is opened . . . . . . . . . . . . . . . . . . . . . .31
10.3 Water is too hot . . . . . . . . . . . . . . . . . . . . . . 31
10.4 Water is not hot enough . . . . . . . . . . . . . . . 32
10.5 Low water flow/pressure . . . . . . . . . . . . . . 32
10.6 Hot water temperature fluctuates at tap . . 32
10.7 Noisy burner/heater during operation . . . . 33
10.8 Error codes C1, C2, CF and/or CE . . . . . . . 33
10.9 Error codes EA and/or EC . . . . . . . . . . . . . . 33
10.10 Manifold gas pressure . . . . . . . . . . . . . . . . . 33
10.11 Adjusting Gas/Air flow . . . . . . . . . . . . . . . . 34
10.12 Factory default settings . . . . . . . . . . . . . . . 36
10.13 Converting Gas Type . . . . . . . . . . . . . . . . . . 36
11 Problem solving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11.1 Error code diagnostics . . . . . . . . . . . . . . . . 38
12 Electrical diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
13 Sensor resistance charts . . . . . . . . . . . . . . . . . . . . . 45
14 Interior components diagram and parts list . . . . . 46
14.1 Interior components . . . . . . . . . . . . . . . . . . 46
15 Protecting the environment . . . . . . . . . . . . . . . . . . 48
16 Installer Checklist to be completed by installer
upon installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

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Key to symbols and safety instructions | 3
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this
document:
•DANGER indicates a hazardous situation which, if not
avoided, will result in death or serious injury.
•WARNING indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
•CAUTION indicates a hazardous situation which, if not
avoided, could result in minor to moderate injury.
•NOTICE is used to address practices not related to
personal injury.
Important information
Additional symbols
1.2 Safety instructions
Read all instructions before installing. Perform the steps in the
indicated sequence. Have the water heater inspected by a
trained service technician at least once every year. Failure to
comply with these instructions can result in severe, possibly
fatal, personal injury as well as damage to property and
equipment.
Installation and servicing
▶Risk of fire when soldering and brazing!
Take appropriate protective measures when soldering and
brazing around combustible and flammable material.
▶ Ensure that only a licensed contractor installs or services
the water heater.
▶ On hot components use only material with adequate
temperature stability.
Installation and commissioning
▶ Do not install this device in confined spaces.
Function
▶ To ensure that the water heater functions properly, follow
these installation and maintenance instructions.
▶ Never close the blow-off line of the pressure safety valve.
For safety reasons, water may escape during heating.
If you smell gas
▶ Turn off the gas shut-off valve.
▶ Open windows and doors if detected inside the house.
▶ Do not try to light the appliance.
▶ Do not touch any electrical switch, telephone, and do not
use outlets.
▶ Extinguish all open flames. Do not smoke! Do not use
lighters!
▶ Warn all occupants of the building. Do not ring doorbells!
▶ If you can hear gas leaking, leave the building immediately.
▶ Prevent others from entering the building and notify the
police and fire department from outside the building and
appliance surround areas.
▶ From outside the building, call the gas utility company and
a trained and certified installer.
If you smell flue gas inside the house
▶ Switch off the appliance.
▶ Open windows and doors.
▶ Inform the certified installer who installed the appliance to
change appliance installation location.
Warnings in this document are identified by
a warning triangle printed against a grey
background.
Keywords at the start of a warning indicate
the type and seriousness of the ensuing risk
if measures to prevent the risk are not taken.
This symbol indicates important information
where there is no risk to people or property.
Symbol Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
• List entry
–List entry (second level)
Table 1

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4 | Key to symbols and safety instructions
Insufficient ventilation may cause toxic flue gas to escape.
Risk of poisoning.
▶ Never close off or reduce the size of the air intake and outlet
openings.
▶ The appliance must not be operated until any obstructions
have been removed.
▶ Inform the customer of the problem and the associated
dangers.
Danger of explosion of flammable gases
▶ Work on gas components may only be carried out by a
trained and certified installer.
▶ Installation, gas and flue connection, initial commissioning,
electrical connections and annual maintenance must only
be carried out by a trained and certified installer.
Combustion air
▶ Keep the combustion air free of corrosive substances
(halogenated hydrocarbons that contain chlorine or
fluorine compounds).
Never shut off safety valves!
▶ Water may escape from the safety valve at any time when
the water is being heated.
Inspection/maintenance
▶ Servicing and repairs may only be carried out by a trained
and certified installer.
▶ Immediately correct all faults to prevent system damage.
▶ Use only Bosch spare parts!
Instruct the customer
▶ Explain to the customer how the appliance works and how
to operate it.
▶ Inform the customer that he/she must not carry out any
alterations or repairs.
Danger from electric shock
▶ Ensure that only an authorized contractor performs
electrical work.
▶ Before performing electrical work, disconnect the power
and secure the unit against unintentional reconnection.
▶ Ensure the system has been disconnected from the power
supply.
Risk of scalding at the hot water fixture
▶ When the water heater is in operation, temperatures in
excess of 120 °F (49 °C) can occur. To limit the
temperature at the tap, install a thermostatic DHW mixing
valve.
▶ Water heated for washing the laundry, dishes and for other
cleaning purposes can cause scalding and permanent
injuries.
▶ Children, elderly, and handicapped persons are more likely
to be permanently injured by hot water. Never leave such
individuals in the tub or shower unattended under any
circumstances. Children must not be allowed to operate
hot water faucets themselves or to fill a bathtub.
▶ If the building has occupants in the above groups who
operate hot water faucets, or state laws / local ordinances
stipulate specific water temperatures, take the following
precautions:
– Use the lowest possible temperature setting.
– To prevent scalding, install a tempering device, such as
an automatic mixing valve, at hot water tap or water
heater. Select and install the automatic mixing valve in
accordance with the valve manufacturer's
recommendations and instructions.
▶ Water exiting from drain valves can be extremely hot. To
avoid injuries:
– Check that all connections are tight.
– Direct exiting water away from people.
▶ Measures must be taken to protect against excessive
temperature and pressure! Installation of a pressure relief
valve (PRV) is required.
To protect against corrosion and ensure compliance with the
rules for electrical safety, observe the following points:
▶ Use metal fittings for potable water heating systems with
plastic piping.
▶ Use only original accessories from the manufacturer.
▶ When installation of the water heater is complete, inspect
the ground conductor (including metal fittings).
Maintenance
Customers are advised to:
▶ Inspect and maintain the water heater on a yearly basis.
Service as needed.
▶ Use only genuine spare parts.
Flooding
▶ After a flood, do not use the appliance if any part has been
submerged. Damage to appliances that have been
submerged can be quite severe and pose numerous safety
risks.
▶ Every appliance that has been submerged must be
replaced.

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Safety information | 5
For your safety
▶ Do not store or use gasoline or other flammable,
combustible or corrosive vapors and liquids in the vicinity
of this or any other appliance.
2 Safety information
Fig. 1
The chart below shows the relationship between water
temperature and time until there is a risk of scalding. It can be
used as the basis for determining the safest water temperature
for your application.
WARNING: System damage!
▶ If a relief valve discharges periodically,
this may be due to thermal expansion in
a closed water supply system. Contact
the water supplier or local plumbing
inspector on how to correct this
situation. Do not plug the relief valve.
WARNING: Personal Injury from toxic
chemicals.
▶ Toxic chemicals, such as those used for
boilertreatment,shallnot beintroduced
into the potable water used for space
heating.
WARNING: Personal Injury from toxic
chemicals.
▶ A water heater which will be used to
supply potable water shall not be
connected to any heating system or
component(s) previously used with a
nonpotable water heating appliance.
Temperature Time to severe scalding1)
120°F(48°C) longerthan5minutes
125 °F (51 °C) 1.5 to 2 minutes
130 °F (54 °C) approx. 30 seconds
135 °F (57 °C) approx. 10 seconds
140 °F (60 °C) less than 5 seconds
145 °F (62 °C) less than 3 seconds
150 °F (65 °C) approx. 1.5 seconds
155 °F (68 °C) approx. 1 second
Table 2 Approximate time-temperature relationship until
there is a risk of scalding

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6 | Appliance details
BOSCH water heater complies with the State of California Lead
Law (AB1953).
3 Appliance details
3.1 Features
Residential / Commercial models
• Greentherm 9800 SEO residential models
– maximum temperature 120 °F1)
• Greentherm 9800 SECO commercial models
– maximum temperature 180 °F
Parts
• High power segmented burner with low NOx emissions.
• Modulating gas valve with pressure regulator.
•Modulatingwatervalve.
• Active bypass water valve for quick response to changing
water flows.
•Burnerpowersegmentation with modulation range from
1:22.
High quality materials for long working life
• Copper heat exchanger.
• Stainless Steel 316L condensing heat exchanger
Features
• Compact space saver: mounts on a wall with a supplied
bracket.
• Easy minimum to achieve low output power.
• Opti-flow that auto adjusts unit for easy installation.
• Easily removable one-piece cover.
• On/Off and Temperature remote control.
• Program button (Selectable temperature default).
• Failure codes for easy diagnostics and repair.
• Real-time diagnostics for troubleshooting/informational
purposes.
• Built in freeze protection.
• Integrated siphon to limit condensate freezing in external
condensate pipes.
Note: The freeze prevention kit is designed to provide
protection for the water heater down to approximately -4 °F
for short term conditions only. It will not protect the
appliance in areas where the temperature is routinely expected
to be below freezing.
- The freeze prevention kit will not protect plumbing outside the
appliance from freezing. Precautions should be taken.
Accessories (Bosch part #)
• Neutralizer Kit (7738001483)
• Wi-Fi module [802.11 b/g/n (2.4 GHz)]
• Aquastat kit (7736504584)
• Recirculation pump kit (7736504585)
• Tank loading NTC (7736504583)
1) Source: Moritz, A.R. and Henriques, F.C., Jr. (1947).
Studies of thermal injury. II. The relative importance of
time and surface temperature in the causation of
cutaneous burns, Am J of Pathol, 23, 695-720.
WARNING: California Proposition 65
The California Safe Drinking Water and Toxic
Enforcement Act requires the Governor of
California to publish a list of substances
known to the State of California to cause
cancer, birth defects, or other reproductive
harm, and requires businesses to warn of
potential exposure to such substances.
▶ This product contains chemicals known
to the State of California to cause
cancer, birth defects, or other
reproductive harm. This appliance can
cause low-level exposure to some of the
substances included in the Act.
1) Can be programmed to achieve 140 °F
BOSCH is constantly improving its products,
therefore specifications are subject to
change without prior notice.

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Appliance details | 7
3.2 Specifications (Technical data)
Approved in US/Canada
Technical characteristics Units Greentherm 9800 SEO / SECO Greentherm 9800 SEO
199 000 Btu 160 000 Btu
Capacity
Maximum flow rate at a 35 °F (19.4 °C) rise1) GPM (l/min) 11.2 (42.4) 9 (34)
Maximum flow rate at a 45 °F (25 °C) rise GPM (l/min) 8.7 (32.9) 7(26.7)
Maximum flow rate at a 55 °F (30.6 °C) rise GPM (l/min) 7.2 (27.5) 5.8 (21.9)
Maximum flow rate at a 75 °F (41.7 °C) rise GPM (l/min) 5.2 (19.7) 4.2 (15.9)
Maximum flow rate at a 90 °F (50 °C) rise GPM (l/min) 4.4 (16.6) 3.5 (13.2)
Maximum output BTU/hr (kW) 197 010 (57.7) 157 608 (46.2)
Maximum input2) BTU/hr (kW) 199 000 (58.3) 160 000 (46.64)
Thermal efficiency (Efficiency in %) % > 99% > 99%
Minimum Input3) BTU/hr (kW) 9 000 (2.6) 9 000 (2.6)
Temperature Control4)
Residential models - Selection range °F ( °C) 100 - 1205) (38 - 49) 100 - 1205) (38 - 49)
Commercial models - Selection range °F ( °C) 100 - 180 (38 - 82) -
Default temperature °F ( °C) 120 (49) 120 (49)
Temperature stability6) °F ( °C) 2 (1) 2 (1)
Gas Requirement
Gas connection inches ¾ " ¾ "
Peak load inlet gas pressure7)
Propane water column 8" - 13" 8" - 13"
Natural Gas water column 3.5" - 10.5" 3.5" - 10.5"
Water
Top hot water connection NPT inches ¾" ¾"
Top cold water connection NPT inches ¾ " ¾ "
Minimum water flow8) GPM (l/min) 0.45 (1.7) 0.45 (1.7)
Maximum water pressure PSI (bar) 150 (10.3) 150 (10.3)
Minimum recommended water pressure PSI (bar) 18 (1.2) 18 (1.2)
Minimum well pressure PSI (bar) 30 (2.1) 30 (2.1)
Water valve material Polymer (PPS) (Polypropylene
Sulfide)
Polymer (PPS) (Polypropylene
Sulfide)
Combustion
CO level ppm 250 (measured) 250 (measured)
CO2level (set from factory) % see table 17 see table 17
Dimensions
Depth inches (mm) 9 27/32 (250) 9 27/32 (250)
Width inches (mm) 18 19/32 (471.5) 18 19/32 (471.5)
Table 3

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8 | Appliance details
Safety devices
• Flame failure device (flame detection via ionization rod)
• Overheat prevention
• Inlet water temperature sensor
• Outlet water temperature sensor
• Exhaust flue gas temperature sensor
• Water flow sensor
• Automatic air flow adjustment independently of altitude,
flue length and flue type
• Scaling detection sensor (HE flue gas temperature sensor)
Height inches (mm) 31½ (800) 31½ (800)
Net weight pounds (kg) 77.5 (35.15) 73.2 (33.20)
Gross weight pounds (kg) 83.67 (37.95) 79.37 (36.0)
Electrical
Nominal V AC 120 120
Frequency Hz 60 60
Amperage (Idle) mA 40 40
Operation A2.4 2.4
Water protection9) IP X5D X5D
1) These flow are based upon setting the unit to higher temperatures and then mixing down using cold water after the unit, to reach
these flow rates.
2) Input rating is based on sea level operation and need not be changed for operation up to 2000 ft (610 m) elevation. For
operation at elevations above 2000 ft (610 m), input rating is automatically reduced at the rate of 4 percent (US) or 10 percent
(Canada) for each 1000 ft (305 m) above sea level.
3) When converted to LPG the minimum input is 17 000 BTU/hr (5 kW).
4) with constant flow.
5) Can be reprogrammed to achieve up to 140 °F (60 °C) (see chapter 8.4).
6) Requirements: Steady flows, single unit installations, up to 140 °F (60 °C).
7) To measure Gas Pressure, see Measuring Gas Pressure, chapter 6.6, page 25.
8) Activation varies with inlet water temperatures.
9) Protection against water drops.
Technical characteristics Units Greentherm 9800 SEO / SECO Greentherm 9800 SEO
199 000 Btu 160 000 Btu
Table 3

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Appliance details | 9
3.3 Unpacking the heater
The heater is default-set by the manufacturer to operate
with Natural Gas, for use with Liquid Propane, follow the
conversion instructions in section 10.13. Before installing
the unit, be certain you have the heater correctly set for
your type of Gas - Propane or Natural Gas. Identification
labels are found on the shipping box, and on the rating plate
which is located on the left side panel of the cover.
Fig. 2 Rating plate
[A] Serial number
[B] Type of gas (Natural gas by default)
3.3.1 The box includes
• Water Heater
•LPConversionKit
• Bracket and screws for wall hanging the heater
• Installation manual (manual can be downloaded at
www.boschheatingandcooling.com)
The Greentherm 9800 SEO/ SECO is not approved or
designed for:
•Manufactured (mobile) homes, boats or any mobile
installation. (Modular homes are acceptable for
installation).
•Use above 10500 ft A.S.L. altitude.
Applications where inlet water temperature is higher than
140°F(60°C)forResidentialappliancesor180°F(82°C)
for Commercial appliances.
In these applications a 3 way valve or thermostatic mixing
valve must be installed before the appliance's water inlet
connection.
•Booster applications.
3.3.2 Remove front cover
▶ Loosen two Phillips head screws located on bottom of
cover (fig. 3).
Fig. 3 Loosen two Phillips head screws
▶ Lift the front cover to remove from the appliance.
▶ Install the appliance vertically with the plumbing
connections facing the ground.
In preheated inlet water applications (i.e.
solar preheat), activation flow rate will vary
depending upon the unit set point, inlet
watertemperatureand thedemandflowrate
thru the unit. Please consult Bosch for
further details to determine if this will
function in your application.

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10 | Appliance details
3.4 General rules to follow for safe operation
•1. You must follow these instructions when you install your
heater. In the United States: The installation must conform
with local codes or, in the absence of local codes, the
National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation must conform with CSA
B149.(1,2) INSTALLATION CODES and /or local
installation codes.
•2. Carefully plan where you install the heater. Correct
combustion air supply and vent pipe installation are very
important. If not installed correctly, fatal accidents can
occur, such as carbon monoxide poisoning or fire.
•3. The water heater must be installed outdoors.
•4. The appliance and its gas connection must be leak tested
before placing the appliance in operation.
The appliance must be isolated from the gas supply piping
system by closing its individual manual gas shutoff valve
(not supplied with heater) during any pressure testing at
pressures in excess of ½ Psig (3.5 kPa).
•5. Keep water heater area clear and free from combustibles
and flammable liquids. Do not locate the heater over any
material which might burn.
•6. Correct gas pressure is critical for the proper operation
of this heater. Gas piping must be sized to provide the
required pressure at the maximum output of the heater,
while all the other gas appliances are in operation. Check
with your local gas supplier, and see section 6.1 on
connecting the gas supply.
•7. Should overheating occur or the gas supply fail to shut
off, turn off the gas supply at the manual gas shut off valve,
on the gas line. Note: manual gas shutoff valve is not
supplied with the heater but must be field installed.
•8. Do not use this appliance if any part has been
underwater. Immediately call the person responsible for
the installation of your appliance to inspect the appliance
and to replace any part of the control system and any gas
control which has been underwater.
•9. Failure to install the heater correctly may lead to unsafe
operation.

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Appliance details | 11
3.5 Dimensions and minimum installation clearances
Fig. 4 Dimensions

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12 | Installation instructions
4 Installation instructions
4.1 Installation tools
The following specialized tools may be required for installation:
• Manometer
• Combustion Gas Analyzer
4.2 Introduction
Please follow these instructions. Failure to follow
instructions may result in:
▶ Damage or injury.
▶ Improper operation.
▶ Loss of warranty.
4.3 Proper location for installing your heater
Carefully select the location of the water heater. For your safety
and for proper heater operation, you must not block or obstruct
combustion air to the heater.
Follow the guidelines below:
1. Locate the heater where gas and plumbing connections are
feasible and convenient.
2. The hot water lines should be kept short and insulated to
save energy. It is recommended to locate the water heater
as close as practical to the most frequently used hot water
fixtures.
3. In areas where outside temperatures is below 32 °F (0 °C)
water pipes should be properly insulated, to maintain
water temperature and prevent freezing.
DANGER:
▶ The water heater must be installed by a
qualified installer in accordance with
these instructions. If improperly
installed, a hazardous condition such as
explosion or carbon monoxide
poisoning could result. Bosch
Thermotechnology Corp. is not
responsible for improperly installed
appliances.
Common installation practice is to first
determine the installation location, then
design the piping layout.
NOTICE: Risk of appliance freezing!
▶ The water in thiswater heater is cold and
always remains cold except for the times
the burner is on. In the event of power
outage in conjunction with freezing
temperatures, the heater should be
drained.
See chapter 9.2, page 30 “Winterizing”
for draining instructions.
WARNING:
▶ Flammable materials, gasoline,
pressurized containers, or any other
items or articles that are potential fire
hazards must NOT be placed on or
adjacent to the heater. The appliance
area must be kept free of all combustible
materials, gasoline and other flammable
vapors and liquids.

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Installation instructions | 13
4.4 Selecting heater location
▶ Choose an outside wall for the installation. Installation on a
wall protected by an overhang above is recommended.
▶ Install the water heater above anticipated snow level.
Minimum clearances
If the appliance is installed under an overhang, there must be a
36" clearance from the top of the appliance and the mounting
area must be open in front and on the sides of the appliance.
Fig. 5
4.5 Mounting instructions
▶ The water heater is approved for installation directly on an
outside wall. Secure the wall mounting bracket provided
with the water heater to a wall surface. See fig. 6.
▶ The installation method of the mounting bracket will
depend on the type of mounting surface. Due to the
varieties of building siding or surfacing, the installer must
decide on how best to support and level the heater on an
outside wall. It is recommended that horizontal or vertical
support boards or plywood sheathing (½ " minimum) first
be attached to the wall surface. The heater must be kept
level on the wall surface.
Fig. 6 Installation on wood siding
Ref
.
Description Min.
distances
A Directly below or adjacent to an opening;
operable windows, doors and any fresh air
openings
1 ft
B
C
DFrom any adjacent wall 1 ft
E Below a gutter, sanitary pipework, eaves or
overhang
3 ft
FAbove ground 1 ft
G From a gas meter or gas regulator 3 ft
Table 4
WARNING:
▶ Do not mount heater directly to vinyl
siding. With vinyl siding, a 3½ ' x 4' area
of the siding must first be removed and
then replaced with wood or other non-
plastic material. See fig. 7.

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14 | Installation instructions
Fig. 7 Installation on vinyl
4.5.1 Air openings
Air openings are located on the back of the water heater. The
combustion air enters between the mounting surface and the
water heater.
▶ Do not restrict in any way air intake openings.
▶ Keep water heater sides clear and unblocked.
Fig. 8 Air openings
4.6 Factory regulation
The appliances are supplied having been set in the factory for
the values shown on the rating plate.
For any other adjustments see chapter 9.
4.6.1 Natural gas
4.6.2 Liquid propane gas (after gas conversion)
If gas conversion is needed (Natural Gas to Liquid propane
gas), see section 10.13.
O2
O2
6720817281-21.1V
The appliances must not be operated if the
dynamic gas pressure is less than
3.5"WC or greater than 10.5" WC.
The appliances must not be operated if the
dynamic gas pressure is less than 8" WC or
greater than 13" WC.
DANGER:
▶ The gas type conversion must only be
carried out by a qualified contractor.

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Installation for modular homes | 15
5 Installation for modular homes
5.1 Mounting installation for modular homes
When installing this appliance on the outside of a modular
home, the unit must be additionally secured at the bottom of
the water heater as shown in fig. 9. Use the included screws to
secure the brackets at the bottom of the water heater to the
wall. If the wall is sheathed with plaster or drywall, it is
recommended that a support board be first attached across a
pair of studs at the bottom of the unit as shown in fig. 6.
Fig. 9 Mounting the heater on modular homes
6 Installation instructions
6.1 Gas piping & connections
Before connecting the gas supply, check the rating plate on the
right side of the heater to be sure that the heater is rated for the
same gas to which it will be connected.
In the United States: The installation must conform with local
codes or, in the absence of local codes, the National Fuel Gas
Code ANSI Z223.1/NFPA 54.
In Canada: The Installation must conform to CGA B149
INSTALLATION CODES and/or local installation codes.
GAS CONNECTIONS
▶ Install a manual gas shut off valve on the gas supply line
within easy reach of the appliance.
▶ Install a union when connecting the gas supply.
▶ Gas connection to the water heater is a ¾ " NPT. See
chapter 6.1.1 for the minimum internal pipe diameter
required.
▶ Undersized flexible appliance connector is not permitted.
▶ National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the
recommendations of the serving gas supplier, see fig. 11.
DANGER: Explosion hazard!
▶ DO NOT connect to an unregulated or
high pressure propane line or to a high
pressure commercial natural gas line.
DANGER: Explosion hazard!
▶ The heater must be isolated from the
gas supply piping system during any
pressure testing of that system at test
pressures equal to or more than 0.5
psig. If overpressure has occurred, such
as through improper testing of the gas
lines or malfunction of the supply
system, the gas valve must be checked
for safe operation.

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16 | Installation instructions
▶ Tighten gas pipe with the support of a wrench, see fig. 10.
Fig. 10 Tighten gas pipe to the heater
Fig. 11 Gas connection
[1] Shut off valve
[2] Gas supply line
[3] Cap
[LA] Minimum 3" sediment trap, (drip leg)
Once connections are made, check for gas leaks at all joints.
Apply some gas leak detection solution to all gas fittings.
Bubbles are a sign of a leak. A combustible gas detector may
also be used to detect for leaks.
GAS LINE SIZING
The gas supply piping for a single heater should be sized for a
maximum draw of 160000 BTU/hr /199000 BTU/hr for the
Greentherm 9800 SEO / SECO 199. Measure the length of the
gas supply line from the building's gas main to the heater and
use the section 6.1.1 and 6.1.2, page 17 or the gas line
manufacturer’s sizing tables to determine the pipe diameter
necessary. If there are more gas drawing appliances on the line,
size the gas line according to the total maximum amount of BTU
draw input rating of for all appliances combined.
Note: Undersizing the gas line may result in diminished hot
water flow rate and temperature. See chapter 6.6, page 25 for
the procedure to measure gas pressure. Proper gas pressure
must be confirmed at time of installation.
DANGER: Explosion hazard!
▶ If you detect a leak, shut off the gas.
Tighten appropriate fittings to stop leak.
Turn the gas on and check again with a
gas leak detection solution. Never test
for gas leaks using a match or flame.

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Installation instructions | 17
6.1.1 Gas Line Sizing Tables for NATURAL GAS
For your convenience see below for an excerpt from gas line sizing tables for a single NG appliance. For details see the current NFPA
54.
Required input for 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC O. The gas supply system must be sized for the
combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in cubic feet per hour. Please contact your local gas supplier
for the energy content of the gas to determine the BTU/hr capacity. Use 1,000 BTU/cubic foot for rough estimations.
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
Maximum pipe capacity in cubic feet of Natural Gas per hour for gas pressures of <2.0 psig (55" WC or 138 mbar) and a pressure
drop of 3.0" W.C. (7.5 mbar) based on 0.60 specific gravity gas).
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Initial Supply Pressure of 8.0" w.c. or Greater
Nominal
Iron Pipe
Size, inches
Internal
Diameter
inches
Length of Black Iron Pipe (Schedule 40 Metallic Pipe), Feet
10 20 30 40 50 60 70 80 90 100
½ 0.622 454 312 250 214 190 172 158 147 138 131
¾ 0.824 949 652 524 448 397 360 331 308 289 273
1 1.049 1787 1228 986 844 748 678 624 580 544 514
Table 5
Initial Supply Pressure of 8.0" w.c. or Greater
Length of Corrugated Stainless Steel Tubing (CSST), Feet
EHD* 10 20 30 40 50 60 70 80 90 100
30 828 580 471 407 363 330 305 285 268 251
31 958 672 546 471 421 383 355 331 311 295
37 1,530 1,090 895 778 698 639 593 555 524 498
Table 6

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18 | Installation instructions
6.1.2 Gas Line Sizing Tables for LP GAS
For your convenience see below for an excerpt from gas line sizing tables for a single LP appliance. Their intended use is for pipe
sizing between the 2nd stage (low pressure) regulator and the appliance. For details see the current NFPA 54 or NFPA 58.
Required input for 160000 / 199000 BTU/hr for the Greentherm 9800 SE / SEC O. The gas supply system must be sized for the
combined total maximum BTU/hr load requirements of all gas appliances running simultaneously.
The tables below show the maximum capacity of the gas supply pipe in thousands of BTU per hour of Undiluted LP Gas at 11" W.C
(0.4 psig or 27.4 mbar) based on a pressure drop of 0.5" W.C (1.25 mbar).
* EHD = Equivalent Hydraulic Diameter. The greater the value of
EHD, the greater the gas capacity of the tubing.
Maximum Capacity of Semi-Rigid (flexible, non corrugated) Tubing in Thousands of BTU/hr of Undiluted Liquefied Petroleum Gases
(at 11 inches Water Column Inlet Pressure).(Based on a Pressure Drop of 0.5 Inch Water Column)* Source National Fuel Gas Code
NFPA 54, ANSI Z223.1 - No Additional Allowance is necessary for an ordinary number of fittings.
Pipe Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal
Iron
Pipe inches
Internal
Diameter
inches
Length of Pipe, Feet
10 20 30 40 50 60 80 100
1/2 0.622 291 200 160 137 122 110 101 94
3/4 0.824 608 418 336 287 255 231 212 197
1 1.049 1150 787 632 541 480 434 400 372
Table 7
CSST Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance Shutoff Valve
EHD* Length of Pipe, Feet
10 20 30 40 50 60 70 80 90 100
23 254 183 151 131 118 107 99 94 90 85
25 303 216 177 153 137 126 117 109 102 98
30 521 365 297 256 227 207 191 178 169 159
31 605 425 344 297 265 241 222 208 197 186
Table 8
Tube Sizing Between Single- or Second-Stage (Low-Pressure) Regulator and Appliance
Nominal
Iron
Pipe
inches
Internal
Diameter
inches
Length of Pipe, Feet
10 20 30 40 50
5/8 0.527 188 129 104 89 79
3/4 0.652 329 226 182 155 138
Table 9

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Installation instructions | 19
6.2 Water quality
Water quality can have an impact on appliance longevity. Water
supplied to the Greentherm 9800 SEO / SECO must be in
accordance with table 10.
For water analysis data call, your local water department, or if
on a well, have well water analyzed periodically. If water quality
exceeds one or more of the values specified below, Bosch
recommends consulting a local water treatment professional
for water softening/conditioning options.
6.3 Water connections
▶ When facing the heater, the ¾ " cold connection is on the
bottom right and the hot connection is on the bottom left.
▶ Tighten all water connectionswith the support of a wrench,
see Fig. 12.
Fig. 12
[1] Hot connection
[2] Cold connection
Fig. 13 Water filter
[1] Cap
[2] Water filter
▶ The use of unions when connecting water pipes to the inlet
and outlet connections is required. This will facilitate any
necessary servicing.
▶ Plastic or PEX type plumbing line materials are not suitable
for connecting directly to or within an 18" pipe run of the
water heater.
▶ Although water piping throughout the building may be
other than copper, we recommend that copper or suitably
rated stainless steel flex line be used for the water
connections for 1.5’ on either side of the water heater
(follow local codes if more stringent).
Description Max. Levels
pH pH 6.5 - 8.5
TDS (total Dissolved Solids) mg/l or ppm 690
Total hardness mg/l or ppm 200
Aluminum mg/l or ppm 2.0
Chlorides mg/l or ppm 250
Copper mg/l or ppm 1.0
Iron mg/l or ppm 0.3
Manganese mg/l or ppm 0.05
Zinc mg/l or ppm 5.0
Table 10
NOTICE:
▶ This heater is not approved for
preheated water applications exceeding
140 °F (60 °C) for Residential
appliances or 180 °F (82 °C) for
Commercial appliances, in these cases
use a 3-way valve or mixing valve must
be installed before the appliance to
prevent water exceeding 140 °F (60 °C)
for Residential appliances or 180 °F
(82 °C) for Commercial appliances,
from entering the appliance.
WARNING: Appliance damage!
Appliance will overheat if not filled with water
▶ Ensure that the appliance is filled with
water by opening a hot water tap, before
plug in the water heater to the power
supply.

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20 | Installation instructions
▶ Never sweat any piping directly to or beneath the water
connections, as damage will occur to the internal water
valve from heating of the pipe.
▶ Keep water inlet and outlet pipes to no less than ¾"
(19.05mm) diameter to allow the full flow capacity.
▶ If the cold and hot connections to the heater are reversed,
the heater will not function.
▶ Be certain there are no loose particles or dirt in the piping.
Blow out or flush the lines before connecting to the water
heater.
▶ Full port shutoff valves should be installed on both the cold
water supply and hot water outlet lines to facilitate
servicing the heater (see fig. 14).
▶ For installation on a private well system with the use of a
pressure tank, the lowest pressure range setting
recommended is 30 psi (2.06 bar).
▶ Proper insulation material should be used in places prone
to freezing conditions.
Connecting the pressure relief valve (PRV)
A pressure relief valve must be installed at the time of
installation. No valve is to be placed between the PRV and the
heater. No reducing coupling or other restriction may be
installed in the discharge line. The discharge line must be a
minimum of 4" above a drain and installed such that it allows
complete drainage of both the PRV and the line. The discharge
line must be placed where it will not cause any damage.
The location of the PRV must be readily accessible for servicing
or replacement, and be mounted as close to the water heater as
possible. See fig. 14. To install the PRV, a suitable fitting
connected to an extension on a “T” fitting can be connected to
the hot water line.
▶ Support all piping.
Fig. 14 Plumbing Connections (with shutoff valves) and
Pressure Relief Valve
[1] Pressure relief valve