Bosch Greentherm T9800 SEC 160/199 Instructions for use

Greentherm T9800 SE(C) 160/199
INDOOR RESIDENTIAL AND COMMERCIAL TANKLESS WATER HEATERS
Applications Manual
WARNING:
Follow each appliance's instructions precisely.
Installation and service must be performed by a trained and certified installer, service agency or
the gas supplier.
Application drawings in this manual are conceptual only and do not purport to address all design,
installation, code, or safety considerations.
The diagrams in this manual are for reference use by code officials, designers and licensed
installers. It is expected that installers have adequate knowledge of national and local codes, as
well as accepted industry practices, and are trained on equipment, procedures, and applications
involved. Drawings are not to scale.
Refer to the appliance and accessory installation manuals for additional detailed information!

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Table of Contents
1 Key to symbols and safety instructions 4
1.1 Key to symbols 4
1.2 Safety 4
2 Introduction 5
3 Water heater sizing and specifications 6
3.1 Sizing tankless water heaters 6
3.2 Tankless water heater accessories 7
3.3 Tankless water heater specifications 8
4 Applications 9
4.1 Single T9800 Installation 9
4.2 Pump sizing for circulation 10
4.3 Domestic hot water circulation 11
4.3.1 Single T9800 with domestic hot water recirculation installation 12
4.4 Tank loading 13
4.4.1 Single T9800 tank loading installation 14
4.4.2 Single T9800 tank loading with recirculation installation 15
4.4.3 Two T9800 tank loading installation 16
4.4.4 Two T9800 tank loading with recirculation installation 17
4.5 Space heating 18
4.5.1 Single T9800 with Bosch air handler installation 18

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1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
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.
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
This symbol indicates important information where
there is no risk to people or property.
1.2 Safety
Please read safety precautions before installation
WARNING:
These instructions are intended as an aid to qualified licensed
service personnel for proper installation, adjustment and
operation of this unit. Read these instructions thoroughly
before attempting installation or operation. Failure to follow
these instructions may result in improper installation,
adjustment, service or maintenance and possibly resulting
in fire, electrical shock, property damage, personal injury or
death.
WARNING:
Disconnect all power to the unit before starting any service
and maintenance. Failure to do so could cause severe
electrical shock resulting in personal injury or death.
WARNING: INSTALLATION REQUIREMENTS
Installation or servicing of this unit can be hazardous due
to parts, compo nents and system pressure. Qualified and
proper trained service personnel should perform installation
and repai r . Failure to do so could cause severe electrical
shock resulting in personal injure or death.

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2 Introduction
This Applications Manual is intended to present some of the most common
applications of the Bosch Greentherm tankless water heaters. Application drawings
are shown with both piping and corresponding electrical schematics where
applicable. Auxiliary equipment depicted does not necessarily represent any one
manufacturer or specific model number. There are a wide variety of techniques,
practices and piping strategies possible when installing water heating appliances. It
is the responsibility of the installing contractor to determine the best solution for the
application.
NOTICE: All drawings are conceptual in nature
and do not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed.
Drawings are for reference use by officials, designers and licensed
installers. It is expected that installers have adequate knowledge
of accepted industry practices for the equipment, procedures, and
applications involved. It is the responsibiltiy of the installer to ensure
that the installation is in accordance with local building codes.
Although this manual covers many common applications for our products, system
possibilities are virtually endless. Should you encounter an application that is
not covered in this manual or have any questions regarding any of its content, we
encourage you to contact your local sales representative or us directly at Bosch
Thermotechnology Corp.
This manual is not a substitute for any of the appliance installation manuals. All
specifications are subject to change.
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: Installation must conform with CGA B149.(1,2)
INSTALLATION CODES and/or local installation codes.

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3 Water heater sizing and specifications
This section describes the water heaters available from Bosch Thermotechnology
Corp. and provides a general overview to the specifications of each particular
model. More detailed information is contained in the installation manuals. Download
manuals at www.bosch-climate.us.
3.1 Sizing tankless water heaters
Rule of thumb sizing
The tables below provide a general rule of thumb when sizing for most residential
applications. For commercial applications or for a more detailed sizing method, use
the Sizing by Chart instructions below in conjunction with the charts on the next
page.
Sizing by Chart
Measure the flow rates at each fixture that will be used simultaneously and
add them together. If only one application will be used at a time measure
each fixture and use the maximum flow rate observed.
Using a known volume container, record several fill times. Perform the
calculation below to determine the flow rate (a one gallon fill time of 30
seconds is 2.0 gallons per minute (GPM):
Flow rate (GPM) = Volume (gallons)
Fill time (sec)
sec
min
60
x
Using a thermometer, measure the incoming water temperature. For
reference, see average ground water temperature map. Subtract this
temperature from the desired hot water temperature to get the degree rise.
If the desired hot water temperature is 120F and incoming temperature is
55F, the desired degree rise is 65F.
EXAMPLE:
Required flow rate of 2.0 GPM at a 65˚F rise.
Refer to the graphs on page 10.
See Table 1 for multiple fixture possibilities and hot water flow rates at given inlet
water temperatures with a water heater set point temperature of 120°F.
CA
OR
WA
ID
NV
MT
WY
UT
AZ
NM
CO
ND
SD
NE
TX
OK
KS
MN
IA
MO
AR
LA
MI
IN
IL
WI
GA
AL
MS
TN
KY
WV VA
NC
SC
FL
NH
VT
NY
PA
OH
NJ
RI
CT
MA
ME
MD
DE
WA
OR
CA
NV
ID
U
T
A
Z
NM
CO
WY
MT
ND
SD
NE
K
S
O
K
TX
LA
AR
MO
IA
MN
WI
MI
IL
IN
OH
KY
TN
M
S
AL
GA
FL
S
C
N
C
VA
WV
PA
NY
MA
A
A
VT
NH
ME
H
˚F
77˚
72˚
67˚
62˚
57˚
52˚
47˚
42˚
37˚
Figure 1 Average ground water temperatures

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Model Inlet temperature (°F)
77° 72° 67° 62° 57° 52° 47° 42° 37°
9800 SE 199
9.3 GPM 8.3 GPM 7.5 GPM 6.9 GPM 6.3GPM 5.9 GPM 5.5 GPM 5.1 GPM 4.8 GPM
9800 SE 160
7.5 GPM 6.7 GPM 6.1 GPM 5.6 GPM 5.1 GPM 4.8 GPM 4.4 GPM 4.1 GPM 3.9 GPM
Table 1 Maximum hot water flow rate at 120°F set point temperature
Showerhead - 2GPM
Sink faucet - 1GPM
3.2 Tankless water heater accessories
Accessory Part Number
Neutralizer (NBT-23) 7738005514
Cable to control external pump 7736504585
External NTC 7736504583
30’ extension cable for outdoor HMI 7736504943
Wifi module 7736504944
Wired remote with wifi 7736504945
Wired remote without wifi 7736504946
Intelligent Cascading Kit 7709003962
Aquastat Connector 7736504584
LPG conversion kit for 199 model 7736504550
LPG conversion kit for 160 model 7736504551
Table 2

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3.3 Tankless water heater specifications
Description Unit T9800 SE 160 T9800 SE 199
Performance
Maximum gas input BTU/hr (kW) 160,000 (46.64) 199,000 (58.3)
Minimum input BTU/hr (kW) 9,000 (2.6) 9,000 (2.6)
Maximum output BTU/hr (kW) 157,608 (46.2) 197,010 (57.7)
Thermal efficiency (Efficiency in %) % > 99% > 99%
Maximum flow rate at a 35 °F (19.4 °C) rise¹ GPM (l/min) 9.0 (34) 11.2 (42.4)
Maximum flow rate at a 45 °F (25 °C) rise GPM (l/min) 7.0 (26.7) 8.7 (27.7.9)
Maximum flow rate at a 55 °F (30.6 °C) rise GPM (l/min) 5.8 (21.9) 7.2 (27.5)
Maximum flow rate at a 75 °F (41.7 °C) rise GPM (l/min) 4.2 (15.9) 5.2 (19.7)
Maximum flow rate at a 90 °F (50 °C) rise GPM (l/min) 3.5 (13.2) 4.4 (16.6)
Temperature Control
Selection range °F ( °C) 100 - 120³(38 - 49) 100 - 120³) (38 - 49)
Default temperature⁵ °F ( °C) 120 (49) 120 (49)
Temperature stability⁶°F ( °C) ± 2 (± 1) ± 2 (± 1)
Gas Requirement
Gas connection inches ¾ ¾
Inlet gas pressure range NG / LP Inch W.C. 3.5” - 10.5” / 8” - 13” 3.5" - 10.5" / 8" - 13"
Water
Top hot water connection NPT inches ¾" ¾"
Top cold water connection NPT inches ¾" ¾"
Minimum water flow⁸GPM (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 30 30
Water valve material ― Polymer (PPS) (Polypropylene Polymer (PPS) (Polypropylene
Combustion
CO level ppm ≤ 250 (measured) ≤ 250 (measured)
CO2 level (set from factory) % see installation manual see installation manual
Weight
Net weight pounds (kg) 73.2 (33.20) 77.5 (35.15)
Gross weight pounds (kg) 79.37 (36.0) 83.67 (37.95)
Electrical
Voltage V AC 120 120
Frequency Hz 60 60
Amperage (Idle) mA 40 40
Amperage (operation) A ≤ 2.7 ≤ 2.7
Water protection IP X4D X4D
Venting
Venting category − IV IV
Approved vent or combustion air pipe material - United States − PP flexible/concentric/rigid, PVC sched. 40, PVC-DWV, CPVC sched. 40, ABS-DWV sched. 40
Approved vent or combustion air pipe material - Canada − CSA or ULC certified only (ULCS636)
Table 3
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 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).
⁶ Requirements: Steady flows, single unit installations, up to 140 °F (60 °C).
⁷ To measure Gas Pressure, see installation manual - Measuring Gas Pressure, chapter 4.13, page 36.
⁸ Refers to activation point. Deactivation point value is 0.35GPM (1.3 l/min).
 Protection against water drops.

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4 Applications
4.1 Single T9800 Installation
Domestic
Hot Water
Domestic
Cold Water
NBT-23
Condensate
Neutralizer )
(part# 7 738 005 514)
To drain or
pump
Gas
Legend
Full-port
ball valve
Thermostatic
mixing valve
Union Check valve
Recirc pump
Aquastat
Potable
expansion
tank )
Pressure
relief valve
Drip leg /
Sediment trap
) as required by local code.
DISCLAIMER: This drawing is conceptual in nature, not to scale and for reference only. Additional functional, installation, and safety devices may be needed or
required. All work pertaining to the installation shall be in full compliance with all legal requirements, including national and local codes. Best installation practices
should be followed.

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4.2 Pump sizing for circulation
The following section outlines pump sizing for domestic hot water recirculation and
tank loading. Only models approved for such applications are listed in this section.
Pump must be bronze or stainless steel and designed for potable water
systems.
Size the pump according to the pressure drop curve of your Greentherm
model (fig. 1 below) and the loop pressure drop tables.
Maximum flow allowed for tank loading through the pump loop is 5 GPM.
Must be 0.45 gpm to activate unit
DHW recirc loop pump must circulate enough gpm to account for normal
loop heat loss and to ensure that the recirc pump eventually satisfies and
turns off
Pressure drop curve
Figure 2
 For direct DHW recirculation and tank loading
applications:
Run the system for 30 minutes to remove debris
from the plumbing. Then remove the unit‘s inlet water filter to
decrease pressure drop through the system. If the inlet water filter,
when removed, contains debris, it is recommended to install a 40
mesh Y-strainer (installer supplied) on the cold water inlet.