Bosch Singular 4000 User manual

Installation Instructions
Gas Condensing Combi Boilers
Singular
Singular 4000 | Singular 5200
BTC 439003301 B / 07.2021
WARNING:
If the information in these instructions are not followed exactly, a fire or explo-
sion may result causing property damage, personal injury or death.
WARNING:
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 electrical switch; do not use any phone in your building.
—Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
—If you cannot reach your gas supplier, call the fire department.
WARNING:
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, personal injury (exposure to hazardous materials)* or loss of
life. Refer to the user's information manual provided with this boiler. Installation
and service must be performed by a qualified installer, service agency or the gas
supplier who must read and follow the supplied instructions before installing,
servicing, or removing this boiler. This boiler contains materials that have been
identified as carcinogenic, or possibly carcinogenic, to humans.
This boiler must be installed in accordance with local, state, and federal codes.
In the absence of such requirements, then to the latest edition of the National
Fuel Gas Code, ANSI Z223.1./NFPA 54. In Canada, installation must be in
accordance with the requirements of CAN/CSA B149.1, Natural Gas and
Propane Installation Code.

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
Table of Contents
1 Key to Symbols and Safety Instructions 4
1.1 Key to Symbols 4
1.2 Safety 4
2 General Information 7
2.1 Included Items 7
2.2 Optional Accessories 7
2.3 Specifications 8
2.4 Rating Plate 9
2.4 Dimensions 10
2.5 Components 11
3 Boiler Installation 13
3.1 Installer Qualifications 13
3.2 Compliance Requirements 13
3.3 Location 13
3.3.1 Access to Utilities 13
3.3.2 Humidity and Contact with Water 13
3.3.3 Drainage 13
3.3.4 Venting and Ventilation 13
3.3.5 Clearances 14
3.3.6 Clean, Debris and Chemical-Free Combustion Air 14
3.3.7 Position 14
3.4 Mounting to the Wall 15
4 System Piping 16
4.1 Installing a Space Heating System 16
4.1.1 Guidelines for a Space Heating System 16
4.1.2 Essential Elements in a Space Heating System 16
4.1.3 Space Heating Piping 17
4.2 Installing a Domestic Hot Water(DHW) System 17
4.2.1 Guidelines for a DHW System 17
4.2.2 Essential Elements in a DHW System 18
4.2.3 DHW System Piping 18
4.3 Connecting the Condensate Drain 19
4.3.1 Filling the Condensate Trap 20
4.4 System Filling 20
4.4.1 Built-In Water Filling 20
4.4.2 External Water Fill Connection 20
4.5 Test the Water System 21
4.5.1 External Water Fill Connection 21
4.6 Examples of System Applications 22
4.6.1 System Application – Zone System with Zone Valves 22
4.6.2 System Application – Single Zone System 23
4.6.3 System Application – Zone System with Circulators 24
5 Connecting the Gas Supply 25
5.1 Gas Pipe Sizing Tables 25
5.2 Gas Piping 26
5.3 Inlet Gas Pressure 27
6 Installing a Vent 29
6.1 Vent Type 29
6.1.1 Direct Venting 29
6.1.2 Non- Direct Venting 31
6.2 Vent Pipe Materials 33
6.3 Vent Length 34
6.4 Connecting the Vent Clip 34
6.5 Vent Termination 35
6.5.1 Single-Pipe Sidewall Venting 35
6.5.2 Two-Pipe Sidewall Venting 35
6.5.3 Snorkel Flue 36
6.5.4 Non-Concentric Sidewall Venting 36
6.5.5 Concentric Sidewall Venting 36
6.5.6 Two-Pipe Vertical Venting 37
6.5.7 Concentric Roof Venting 37
7 Setting the DIP Switches 38
8 Connecting the Power Supply 39
9 Installation Checklist 40
10 Operating the Boiler 42
10.1 Turning the Boiler On or Off 42
10.2 Checking the Ignition System 42
10.3 Setting the Space Heating Temperature 42
10.4 Setting the DHW (Domestic Hot Water) Temperature 43
10.5 Viewing Basic Information 43
10.5.1 H0 mode 44
10.5.2 H1 mode 44
10.5.3 H2 mode 44
10.5.4 H3 mode 44
10.5.5 H4 mode 45
10.5.6 H5 mode 45
10.5.7 H6 mode 45
10.5.8 H7 mode 45
10.5.9 H8 mode 46
10.5.10 H9 mode 46
10.5.11 HA mode 46
10.5.12 HB mode 46
10.5.13 Cd mode 47
10.6 Setting the Heat Load for The Outdoor Reset Control Mode 47
10.7 Altitude Adjustment 49
11 Gas Conversion 50
11.1 Combustion Analysis 52
12 Wiring Diagram 54
13 Ladder Diagram 55
14 Normal Operating Sequence 56
15 Outdoor Temperature Sensor 58
15.1 Outdoor Temperature Sensor Installation (Optional) 58
15.2 Outdoor Temperature Sensor Installation Guidelines 58
15.3 Outdoor Reset Control 59
16 Inspection and Maintenance 60
16.1 Draining the Boiler 60
16.2 Cleaning the Cold Water Inlet Filter 62
16.3 Cleaning the Air Intake Filter 62
16.4 Protecting the Boiler from Freezing 63
16.5 Maintenance Schedules 63
16.5.1 Owner Maintenance 63
16.5.2 Service Technician Maintenance 63
17 Troubleshooting 65
17.1 Basic Problems 65
17.2 Error Codes 66

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
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 before proceeding
WARNING:FIRE,EXPLOSION
Vapors from flammable liquids can explode and/or catch fire
causing death or severe burns.
Keep flammable products far away from the boiler and store
them in approved containers. Keep the containers tightly
closed and out of the reach of children.
The boiler has a main burner flame that can come on at any
time and will ignite flammable vapors.
Vapors cannot be seen and are heavier than air. They can
travel long distances along the ground and can be carried
from other rooms to the boiler’s main burner flame by air
current.
WARNING:SCALDHAZARD
Water temperature over 125°F can cause severe burns or
death from scalding.
If it is necessary to set the water temperature above 125°F
(52°C), consider installing a thermostatically-controlled
mixing valve. Contact a licensed plumber or your local
plumbing authority for more information.
Children, the disabled and the elderly are at highest risk of
being scalded.
Test water before bathing or showering.
Temperature TimetoProduceSerious Burn
120 °F (48 °C) More than 5 minutes
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 1
WARNING: RISKOFPERSONAL INJURYORDEATHFROMEXPLOSION!
Work on gas components may only be carried out by a
trained and certified installer or service company.
Appliance installation, the connection of gas and vent
piping, initial commissioning, electrical connections, and
service and maintenance must only be carried out by a
trained and certified installer or service company.

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
WARNING:FIRE,EXPLOSION
Do not store combustibles, such as papers or laundry, near
the boiler or venting system.
Do not store or use gasoline or other flammable liquids near
this boiler.
Do not store or use compressed gases, such as hair sprays
or spray paints, near the boiler or venting system, including
the vent termination.
WARNING:HAZARDOUSVOLTAGE
Do not remove the front cover unless the power to the boiler
is turned off or disconnected.
Do not touch the internal components of the boiler or the
power cord with wet hands.
WARNING:FIRE,CARBONMONOXIDE
Do not operate the boiler with the front cover opened.
Do not operate the boiler without proper venting.
Do not place anything in or around the vent terminals that
could obstruct the air flow in or out of the boiler.
WARNING:FIRE,EXPLOSION
Have your installer or plumber show you the location of the
gas shut off valve and demonstrate how to close the valve. If
the boiler is damaged as a result of overheating, fire, flood,
or any other reason, close the manual shut off valve and do
not operate the boiler again until it has been inspected by a
qualified technician.
WARNING:FIRE,EXPLOSION
Should overheating occur or if the gas supply fails to shut
off, turn off the manual gas shut off valve.
WARNING:PERSONALINJURY,PROPERTY DAMAGE
Do not allow children to operate or have access to the boiler.
WARNING:IMPROPEROR DANGEROUSOPERATION
Immediately call a qualified service technician to inspect the
appliance and replace any part of the control system and/or
any gas control which has been immersed in water.
WARNING:
This product can expose you to chemicals including Lead
and Lead components, which are known to the State
of California to cause cancer and birth defects or other
reproductive harm. For more information go to www.
P65Warnings.ca.gov.
WARNING:FIRE,CARBONMONOXIDE
After replacement of a gas related component, where a
gasket of seal has been disturbed or replaced, check for gas
tightness using a gas detector / analyzer.
On re-assembly check all affected seals for cracks hardness
and deterioration. If damaged or in any doubt the seal must
be replaced.
CAUTION:INTENDEDUSE
Do not use the boiler for anything other than its intended
purpose, as described in this manual.
CAUTION:IMPROPERORDANGEROUSOPERATION
Do not use unapproved replacement or accessory parts.
When servicing the controls, label all wires prior to
disconnecting them to prevent wiring errors.
Do not attempt to repair or replace any part of the boiler,
unless it is specifically recommended in this manual. For all
other service, contact an authorized technician or licensed
professional. Improper adjustments, alterations, service, or
maintenance may lead to property damage, personal injury,
or death and will void your warranty.
NOTICE:BOILERDAMAGE
Do not turn on the boiler unless the water and gas supplies
are fully opened. Failure to do so may damage the boiler.

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
1.3 Important Note for the State of Massachusetts
NOTICE BEFORE INSTALLATION
This appliance must be installed by a licensed plumber or gas fitter in accordance
with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 4.00 and
5.00.
IMPORTANT: In the State of Massachusetts (248 CMR 4.00 & 5.00)
For all side wall horizontally vented gas fueled equipment installed in every
dwelling, building or structure used in whole or in part for residential purposes,
including those owned or operated by the Commonwealth and where the side wall
exhaust vent termination is less than seven (7) feet above finished grade in the
area of the venting, including but not limited to decks and porches, the following
requirements shall be satisfied.
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of
installation of the side wall horizontal vented gas fueled equipment, the
installing plumber or gasfitter shall observe that a hard wired carbon
monoxide detector with an alarm and battery back-up is installed on the floor
level where the gas equipment is to be installed. In addition, the installing
plumber or gasfitter shall observe that a battery operated or hard wired
carbon monoxide detector with an alarm is installed on each additional level
of the dwelling, building or structure served by the side wall horizontal vented
gas fueled equipment. It shall be the responsibility of the property owner to
secure the services of qualified licensed professionals for the installation of
hard wired carbon monoxide detectors
a. In the event that the side wall horizontally vented gas fueled equipment
is installed in a crawl space or an attic, the hard wired carbon monoxide
detector with alarm and battery back-up may be installed on the next
adjacent floor level.
b. In the event that the requirements of this subdivision cannot be met
at the time of completion of installation, the owner shall have a period
of thirty (30) days to comply with the above requirements; provided,
however, that during said thirty (30) day period, a battery operated
carbon monoxide detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide
detector as required in accordance with the above provisions shall comply
with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. A metal or plastic identification plate shall be permanently
mounted to the exterior of the building at a minimum height of eight (8)
feet above grade directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating appliance or equipment. The sign
shall read, in print size no less than one half (1/2) inch in size, “GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.
4. INSPECTION. The state or local gas inspector of the side wall horizontally
vented gas fueled equipment shall not approve the installation unless, upon
inspection, the inspector observes carbon monoxide detectors and signage
installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through
4.

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
2 General Information
2.1 Included Items
The following items are included with the boiler. Check each of the following items
before installation.
Figure 1
Wall mounting bracket Tapping screws & anchors
Installation and
User manual
Vent clip
Gas conversion kit
Spare parts
Pressure Relief Valve
2" Vent termination cap &
Wall ange
If there is a missing item, please contact Technical Support at
1-866-642-3198.
2.2 Optional Accessories
The following optional accessory is not included with the boiler, but may be
necessary for the installation. Check the need for the following optional accessory
before installation.
Figure 2
Outdoor temperature sensor
WARNING:
Installing the appliance and/or any accessories for the
appliance may only be carried out by a qualified service
technician and must conform to the requirements of the
authority having jurisdiction or, in the absence of such
requirements, to the latest edition of the National Fuel
Gas Code, ANSI Z223.1./NFPA 54. In Canada, installation
must be in accordance with the requirements of CAN/CSA
B149.1, Natural Gas and Propane Installation Code.

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
2.3 Specifications
The following table shows the specifications for the boiler. Additional specifications
about water, gas, electric, and air supplies (venting) appear in each installation
section.
Singular4000 Singular 5200
Heat Capacity (Input) Space Heating 19,900–80,000 BTU/H 19,900–140,000 BTU/H
Domestic Hot Water 19,900–155,000 BTU/H 19,900–199,000 BTU/H
Flow Rate (DHW) 45°F (25°C) Temp Rise 6.0GPM (23LPM) 7.7GPM (29LPM)
67°F (37°C) Temp Rise 4.0GPM (15LPM) 5.2GPM (20LPM)
AFUE Natural Gas (propane) 95.0% (95.0%) 95.0% (95.0%)
Dimensions (W x D x H) 18.1“ x 27.6” x 11.6“ (460 mm x 700 mm x 295 mm)
Installation Type Indoor wall-hung
Venting Type Forced draft direct vent
Ignition Electronic ignition
Water Pressure(Hydronic/DHW) 12~30psi /15~150 psi
Supply Pressure Natural Gas 3.5" – 10.5" WC
Propane 8" – 13" WC
Temperature Range Space Heating 82°F – 180°F(27°C – 82°C)
DHW 86°F – 140°F(31°C – 60°C)
Minimum Flow Rate (DHW) 0.5GPM(2.0LPM)
Power Supply Main Supply 120V AC, 60 Hz / uses less than 5 AMP
Connection Sizes
Space heating Supply/Return 1" NPT
Cold water Inlet 3/4" NPT
Hot Water Outlet 3/4" NPT
Gas Inlet 3/4" NPT
Materials Primary Heat Exchanger Stainless steel
Secondary Heat Exchanger Stainless steel
Venting
Exhaust/Intake "2"" or 3"" PVC, CPVC, Polypropylene
2"" or 3"" Special gas vent type BH (Class II, A/B/C)"
Length 2" 60ft(18.3m)
3" 150ft(45.7m)
Vent Clearances 0" to combustibles
Safety Devices Flame rod, APS, Over heat preventer, Low water cut off switch,
Exhaust temperature high limit sensor, Power surge fuse
Table 2

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
2.4 Rating Plate
WARNING:FIRE,EXPLOSION
The gas type and electricity voltage must match the rating
plate. Using a different gas type and electricity voltage will
cause the boiler to malfunction.
Before the installation, check the rating plate located on the side of the boiler to
ensure that the boiler matches the gas type, gas pressure, water pressure, and
electrical supply available in the installation location. If the boiler does not match
each of these ratings, do not install the boiler. If the gas conversion is required, the
included gas conversion kit must be used.
Figure 3
Natural Gas
0.
Certied to
NSF/ANSI 372
Combination Boiler and Space Heater / Combiné Chaudière et Chaue-Espace
For either direct vent installation or for installation using indoor combustion air .
/Pour une installation à évacuation directe ou pour une installation utilisant de l'air de combustion à l'intérieur .
Natural Gas
Heating Capacity
Capacité de chauffage
3.5~10.5
210
Edition of the standard : ANSI Z21.13-2017. CSA 4.9-2017, Low Pressure Boiler
Orices necessary for LP conversion are provided.
Les injectures nécessaires à la conversion au GPL sont fournis.
For installation on noncombustible oors only . /Pour l'installation sur des sols incombustibles uniquement.
Water temperature limit
limite de température de l'eau
M/C No. 271266
of
This boiler must be installed in accordance with local codes, if any; if not, follow the National Fuel Gas Code , ANSI
Z223.1/NFP A 54, or the Natural Gas and Propane Installation Code , CAN/CSA B149.1, as applicable.
Cette chaudière doit être installée conformément aux codes locaux, le cas échéant. Sinon, respectez le code national de gaz
combustible, ANSI Z223.1 / NFPA 54, ou le code d'installation de gaz naturel et propane, CAN/CSA B149.1, selon le cas.
This boiler must be installed with vent the vent-air intake system as specied and installed in accordance with the
Cette chaudière doit être installée de manière à purger le système d’admission d’air-air comme spécifié et installée
manufacturer ’s installation instructions.
conformément aux instructions d’installation du fabricant.
When reinstalling the appliance, check the sealing on the exhaust & air intake vent system.
Lors de la réinstallation de l'appareil, vérifiez l'étanchéité du système de ventilation d'échappement et d'admission d'air.
50 W entworth Ave, Londonderry , NH 03053
~
Bosch
Bosch Thermotechnology Corporation
-866-642-3198
The pressure relief valve provided by the manufacturer shall
Valve shall be placed in suitable area where it will not cause
doit
damage.
(La vanne doit être placée dans un endroit approprié où
elle ne causera pas de dommages.)
Bosch.
Bosch.
en haute de
Corée du Sud

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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
2.4 Dimensions
Figure 4
2.80"
(71.1 mm) 0.36" (9.2 mm)
18.11" (460 mm)
5.57"
(141.5 mm)
5.26"
(133.5 mm)
11.61" (295 mm)
G
H
4.0"
(101.6 mm)
3.6"
(91.4 mm)
2.7"
(68.6 mm)
1.6" (40.6 mm)6.1"
(154.9 mm)
2.8"
(71.1 mm)
3.4"
(86.4 mm)
4.7" (119.4 mm)
2.2"
(55.9 mm)
8.0" (203.2 mm)
A B C D E F 1.8"
(45.7 mm)
27.56" (700 mm)
31.87" (809.5 mm)
Position Description Diameter
A Space heating Return 1" NPT
B Cold water inlet 3/4" NPT
C Condensate Outlet 1/2" NPT
D Hot water Outlet 3/4" NPT
E Space heating Supply 1" NPT
F Gas Inlet 3/4" NPT
G Exhaust Vent 2"
H Air inlet 2"
Table 3