Bosch 660 EF User manual

Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas Code,
ANSI Z223.1/NFPA 54.
When applicable, installation must conform with the Manufactured Home Construction and Safety Standard, Title 24 CFR, Part
3280 or the Canadian Standard CAN/CSA-Z240 MH Mobile Homes, Series M86. (660 EFO only)
SBA8517
660 EF/EFO
INDOOR MODEL/OUTDOOR MODEL
INDOOR MODEL 660 EF- Natural Gas/Liquefied Petroleum (LP) Gas
OUTDOOR MODEL 660 EFO- Natural Gas/Liquefied Petroleum (LP) Gas
6 720 644 063 (2010/03) US/CA
Warning: 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.
Improper installation, adjustment, alteration,
service or maintenance can cause injury or
property damage. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency or the gas
supplier.
In the Commonwealth of Massachusetts this
product must be installed by a licensed plumber or
gas fitter.
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
• Close gas valve. Open windows.
• 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.
• Installation and service must be performed by a
qualified installer, service agency or the gas supplier.

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2
Index
Index
1 Important Safety Information 3
2 Appliance details 7
2.1 Features 7
2.2 Specifications (Technical data) 8
2.3 Before Installation 9
2.4 Dimensions (660 EF) 10
2.5 Dimensions (660 EFO) 10
3 Installation instructions 11
3.1 Specialized tools 11
3.2 Introduction 11
3.3 Venting (660 EF only) 11
3.4 Combustion air requirements 15
3.5 Choosing Installation Site 17
3.6 Installation Clearances 18
3.7 Installation 19
3.8 Gas piping 21
3.9 Water piping 24
3.10 Water Treatment 25
3.11 Plumbing Applications 27
4 Electrical Wiring 28
4.1 Electrical wiring 28
4.2 Remote Controller 29
4.3 Remote Controller Installation Guide 30
5 Operation instructions 33
5.1 Trial Operation 33
5.2 Initial Operation 33
5.3 How to Use
(Not using the remote controller) 34
5.4 How to Use (Using the remote controller) 35
6 Maintenance and service 37
6.1 Regular Maintenance 37
6.2 Preventing Damage from Freezing 38
7 Troubleshooting 40
7.1 Initial Operation 40
7.2 Temperature 40
7.3 Amount of Hot Water 41
7.4 Remote Controller 42
7.5 Sounds 42
7.6 Others 43
7.7 Check for an Error Code
(Using the remote controller) 44
8 Follow- up Service 45
8.1 Requesting Service 45
8.2 Gas conversion 45
9 Interior components diagram 46
9.1 660 EF Interior components 46
9.2 660 EFO Interior components 47
10 Protecting the environment 48
11 Limited Warranty 49

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Important Safety Information
3
1 Important Safety Information
To prevent damage to property and injury to the user,
the icons shown below will be used to warn of varying
levels of danger. Every indication is critical to the safe
operation of the water heater and must be understood
and observed. Potential dangers from accidents during
installation and use are divided into the following four
categories. Closely observe these warnings; they are
critical to your safety.
Icons warning of risk level
CAUTION used without the safety alert symbol indi-
cates a potentially hazardous situation which, if not
avoided, may result in property damage.
Attention Installers
• In order to use the water heater safely, read this
installation manual carefully, and follow the installa-
tion instructions.
• Failures and damage caused by erroneous work or
work not as instructed in this manual are not covered
by the warranty.
• Check that the installation was done properly in
accordance with this Installation Manual upon
completion.
• After completing installation, please either place this
Installation Manual in a plastic pouch and attach it to
the side of the water heater (or the inside of the pipe
cover or recess box if applicable), or hand it to the
customer to retain for future reference.
Fig. 1
This is the safety alert symbol. It is used
to alert you to potential personal injury
hazards. Obey all safety messages that
follow this symbol to avoid possible
injury or death.
Danger: DANGER indicates an
imminently hazardous situation which, if
not avoided, will result in death or
serious injury.
Warning: WARNING indicates a
potentially hazardous situation which, if
not avoided, could result in death or
serious injury.
Caution: CAUTION indicates a
potentially hazardous situation which, if
not avoided, may result in minor or
moderate injury.
HOT
BURN
DANGER
Water temperature over 125°F can
cause severe burns instantly or
death from scalds.
Children, disabled and elderly are
at highest risk of being scalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.

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4
Important Safety Information
Fig. 2
Danger: [660 EF] - do not install
outdoors!
Do not use the water heater if the ex-
haust pipe is displaced, has holes, is
clogged or is corroded.
Danger: [660 EFO] - do not install
indoors!
This will cause carbon monoxide poi-
soning and a potential fire hazard.
Danger: Do not allow anyone to
change the water temperature while hot
water is being used!
To prevent scalding, do not change the
water temperature to a higher setting.
Warning: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or death.
Warning: This water heater does not
have a pilot. It is equipped with an igni-
tion device that automatically lights the
burner. Do not try to light the burner by
hand.
Warning: BEFORE OPERATING
smell all around the water heater area
for evidence of leaking gas. Be sure to
smell next to the floor because some
gas is heavier than air and will settle on
the floor.
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 inyour building.
- Immediately call your gas supplier from
a neighbor’s phone. Follow the gas sup-
plier’s instructions.
- If you cannot reach your gas supplier,
call the fire department.
Warning:
Use only your hand to turn the gas valve
knob. Never use tools. If the knob will
not turn by hand, don’t try to repair it.
Call a qualified service technician.
Force or attempted repair may result in
a fire or explosion.
Warning:
Do not use this water heater if any part
has been under water. lmmediately call
a qualified service technician to inspect
the water heater and to replace an dam-
aged parts.
Warning:
When a gas leak is noticed:
1. Stop use immediately
2. Close the gas valve
3. [When installing indoors] Open win-
dows and doors.
Warning:
If you detect abnormal combustion or
abnormal odors, or during an earth-
quake, tornado or fire:
1. Turn off the hot water supply
2. Turn off the power to the water heat-
er
3. Turn off gas and water supply valve.
4. Call the nearest Bosch agent.

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Important Safety Information
5
Warning: Explosion Hazard!
If the temperature and pressure relief
valve is dripping or leaking, have a qual-
ified service technician replace it. Do
not plug or remove the valve. Failure to
follow these instructions can result in
fire or explosion, and personal injury or
death.
Warning:
Check the temperature of the running
hot water before entering the shower.
Check the temperature before stepping
into the bath tub.
Warning:
Do not place the exhaust vent terminal
in an indoor environment by means of
adding walls and ceiling (do not en-
close using corrugated sheets, etc.).
Carbon monoxide poisoning or fire may
occur as a result.
Warning:
Leave the proper clearance between
the water heater and nearby objects
(trees, timber, boxes with flammable
materials etc.).
Warning:
Do not use combustible chemicals
such as oil, gasoline, benzene etc. in
the near the heater or the exhaust vent
terminal.
Warning:
Do not place combustibles such as
laundry, newspapers, oils etc. near the
heater or the exhaust vent terminal.
Warning: [660 EF only]
Carbon Monoxide Poisoning Hazard.
Do not install this water heater in a mo-
bile home, recreation vehicle or on a
boat.
Warning: [660 EFO only]
Carbon Monoxide Poisoning Hazard.
Do not install this water heater in a rec-
reation vehicle or on a boat.
Warning:
Do not store or use gasoline or other
flammable vapors and liquids in the vi-
cinity of this or any other appliance.
Warning:
Do not place or use a spray can near
the heater or the exhaust vent terminal.
Warning:
Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
Warning: [When installing indoors
660 EF]
Check the air supply vent for dust or ob-
structions.
Warning:
If this unit will be installed in a beauty
salon or other location where hair spray
or aerosols will be used, locate the unit
in a separate area that is supplied with
fresh air from outdoors.
Warning:
Do not use hair spray or spray deter-
gent in the vicinity of the heater.
Warning:
Do not allow small children to play un-
supervised in the bathroom. Do not al-
low small children to bathe
unsupervised.
Warning:
Do not touch the powercord with wet
hands.
Warning:
Consult the nearest Bosch agent if the
water heater location needs to be
changed.
Warning:
Contact a qualified service technician
for any necessary repairs, service or
maintenance.

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6
Important Safety Information
Warning:
Contact Bosch before using with a so-
lar pre-heater.
Warning:
California Proposition 65 lists chemical-
substances known to the state to cause
cancer, birth defects, death, serious ill-
ness or other reproductive harm. This
product may contain such substances,
be their origin from fuel combustion
(gas, oil) or components of the product
itself.
Warning:
The gas conversion kit shall be installed
by a qualified service agency in accord-
ance with the manufacturer’s instruc-
tions and all applicable codes and
requirements of the authority having ju-
risdiction. The information in the instruc-
tions must be followed to minimize the
risk of fire or explosion or to prevent
property damage, personal injury, or
death. The qualified service agency is
responsible for the proper installation of
this kit. The installation is not proper
and complete until the operation of the
converted appliance is checked as
specified in the manufacturer’s instruc-
tions supplied with the kit.
Caution:
Be sure to electrically ground the unit.
Caution:
Keep power cord free of dust.
Caution:
Do not use the water heater for other
than hot water supply, shower and bath.
Caution:
Do not use a broken or modified power
cord. Do not bind, bend or stretch pow-
er cords. Do not scratch, modify, or
subject them to impact or force.
Caution:
To prevent burns or scalding, turn off
the power button or power supply and
wait until the equipment cools before
performing maintenance.
Caution:
Do not turn off the water heater while
someone is bathing.
Caution:
Do not cover the water heater and the
exhaust vent terminal, store trash or de-
bris near it, or in any way block the flow
of fresh air to the unit.
Caution:
Do not install in locations where exces-
sive dust or debris will be in the air.
Caution:
Do not touch the exhaust vent (pipe, ter-
minal) during or immediately after oper-
ation of the water heater.
Caution:
Do not drink water that has been inside
the unit for an extended period of time.
Do not drink the first use of hot water
from the unit in the morning.
Caution:
Clean the filter on the water inlet as fre-
quently as required by the quality of
your local water.
Caution:
Keep the area around the unit clean. If
boxes, weeds, cobwebs, cockroaches
etc. are in the vicinity of the unit,
damage or fire can result.
Caution:
Do not install the equipment where the
exhaust will blow on walls or windows.
Caution:
Treat hard, acidic or otherwise impure
supply water with approved methods to
ensure full warranty coverage.
Caution:
Problems resulting from scale formation
are not covered by the warranty.
Caution:
Check ignition during use and extinc-
tion after use.

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Appliance details
7
2 Appliance details
2.1 Features
Parts included with the unit
• Tapping Screw
• Installation Manual/user manual with warranty inside
(this document)
• Cross Recess Head Screw (660 EFO NG, 660 EFO
LP)
• Power Cord (660 EF NG, 660 EF LP).
Accessories (Bosch part #)
• Optional Remote Control to operate with the appli-
ance BRC01US for USA, BRC01CA for Canada
• Isolation Valves (includes pressure relief valve)
• Remote Controller Outdoor Junction Box (BOJB)
• Remote Controller cord 3m (10ft) BRC10CORD
• Remote Controller cord 8m (26ft) BRC26CORD
• Recess Box BRBKIT (for 660 EFO only)
• Pipe Cover (BPCKIT).
Caution:
Do not run water through the unit
when unit is not on. When discharg-
ing hot water, make sure the unit is ON.
If water is run through the unit with the
unit OFF, water may condense inside
the unit and cause incomplete combus-
tion or damage to the internal electrical
components. For single-handle fixtures
or valves, discharge water setting the
handle completely to the water side.
Caution:
This unit is only approved for installation
up to 1350m (4500 ft.) above sea level.
For installations at higher elevations,
contact Bosch Thermotechnology
Corp. for Instructions.
Caution:
Do not disassemble the remote control-
ler. Do not use benzene, oil or fat deter-
gents to clean the remote controller.
This may cause deformation. Do not get
the remote controller wet. Although it is
water resistant, too much water can
cause damage. Do not splash water on
the remote controller. Do not expose
the remote controller to steam. Do not
locate the remote controller near stoves
or ovens, this may cause damage or fail-
ure.
Caution:
Preventing damage from freezing (see
section 6.2). Damage can occur from
frozen water within the device and
pipes even in warm environments. Be
sure to read below for appropriate
measures. Repairs for damage caused
by freezing are not covered by the war-
ranty.
Caution:
Take necessary measures to prevent
freezing of water and leakage of gas
when leaving the unit unused for long
periods of time (see section 6.2).
Caution:
If it is snowing, check the air inlet, ex-
haust gas vent and exhaust vent termi-
nal for blockage.
Caution:
Do not use parts other than those
specified for this equipment.
i
BOSCH is constantly improving its prod-
ucts, therefore specifications are subject
to change without prior notice.

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8
Appliance details
2.2 Specifications (Technical data)
Approved in US/Canada
Capacity
Maximum flow rate: 5.3 GPM (20 l/min) at a 45°F
(25°C) rise.
Maximum Input
140,000 Btu/h (41,03 kW)
Minimum Input
20,000 Btu/h (5.67 kW)
Temperature Control
Selection range: 100°F (37°C) - 160°F (70°C)
Default temperature: 120°F (50°C)
Temperature Settings using the remote controller:
USA
100- 150 °F (5°F intervals), 160 °F
Canada
37-48°C (In 1°C intervals), 50-70°C (In 5°C intervals)
Gas Requirement
Gas connection (inches) - ¾”
Inlet gas pressure under operation (with a high hot
water flow rate)
• Propane: 8” - 14” water column
• Natural Gas: 4” - 10.5” water column.
Power Supply Consumption
• Freeze Prevention 141W.
Water
• Hot water connection (inches) - ¾”
• Cold water connection (inches) - ¾”
• Minimum water flow: 0.5 gallon/minute (2 l/m)
Note: The capacity may differ slightly, depending on
the water pressure, water supply, piping conditions,
and water temperature
• Water pressure recommend: 29 to 70 psi
• Connections:
– Bottom of heater
Dimensions
• Depth (in): 6.7” (170 mm)
• Width (in): 13.8” (350 mm)
• Height (in): 20.5” (520 mm)
• Weight: 36 pounds (16.3 kg).
Gas types
Natural Gas.
LP Gas.
Voltage
120 V AC (60 Hz) nominal
Safety devices
• Flame Rod
•ThermalFuse
• Lightning Protection Device (ZNR)
• Overheat Prevention Device
• Freezing Prevention Device
• Fan Rotation Detector.
i
If this water heater is being installed at an
elevation of 2,000' (610m) or higher,
disconnect the connector labeled "High
Elevation Disconnect". This connector is
located inside the unit.

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Appliance details
9
2.3 Before Installation
Fig. 3 Ex. For LP Gas 660 EFO
Danger: Checkup!
Check the fixing brackets and vent pipe
yearly for damage or wear. Replace if
necessary.
Danger: Check the gas!
- Check that the rating plate indicates
the correct type of gas.
- Check that the gas supply line is sized
for 140,000 BTU for 660 EF, 660 EFO.)
Warning: Check the power!
The power supply required is 120VAC,
at 60Hz. May result in fire or electric
shock.
Warning: Use Extreme Caution if Us-
ing With a Solar Pre-Heater!
Using this unit with a solar pre-heater
can lead to unpredictable output tem-
peratures and possibly scalding. If abso-
lutely necessary, use mixing valves to
ensure output temperatures do not get
to scalding levels.
Caution: Do Not Use Equipment for
Purposes Other Than Those Specified!
Do not use for other than increasing the
temperature of the water supply, as un-
expected accidents may occur as a re-
sult.
Caution: Check Water Supply Quality!
If the water supply is in excess of 6
grains per gallon (100 mg/L) of hard-
ness, acidic or otherwise impure, treat
the water with approved methods in or-
der to ensure full warranty coverage.

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10
Appliance details
2.4 Dimensions (660 EF)
Fig. 4 Dimensions
2.5 Dimensions (660 EFO)
Fig. 5 Dimensions