Bosch GWH-345/450-ESR-N User Manual
6 720 607 909
2
Index
Index
1
Warning
2
2
Appliance details
4
2.1
Features 4
2.2
GWH-345/450-ESR Specifications (Technical data)
4
2.3
Unpacking the GWH-345/450-ESR heater
5
2.4
General rules to follow for safe operation
6
2.5
Dimensions and minimum installation clearances
7
2.6
Applications 8
2.7
Water quality
9
3
Installation instructions
10
3.1
Introduction 10
3.2
Proper location for installing your heater
10
3.3
Heater placement and clearances
10
3.4
Mounting installation
10
3.5
Combustion air requirements
11
3.6
Venting
13
3.6.1
Vent material and specifications
13
3.6.2
Vent connections and air inlet restrictors
14
3.6.3
Condensate drain requirements
17
3.6.4
Room sealed installation (Twin pipe)
17
3.6.5
Vertical terminations
18
3.6.6
Horizontal terminations
18
3.6.7
Exhaust vent configuration examples
21
3.7
Gas piping & connections
22
3.8
Measuring gas pressure
24
3.9
Checking restrictor plate size by measuring CO
2
level value
24
3.10
Water connections
25
3.11
Electrical connections
25
4
Operating instructions
27
4.1
Initial filling instructions
27
4.2
For your safety read before operating your water heater 27
4.3
Startup instructions
27
4.4
Power 28
4.5
Recirculating water temperature
28
4.6
Temperature and hot water flow
28
4.7
Freeze protection
28
4.8
Electrical diagram
29
5
Maintenance and service
30
5.1
Service mode
30
6
Troubleshooting 32
7
GWH-345/450-ESR Functional scheme
34
8
Interior components diagram and parts list
35
8.1
Interior components
35
8.2
Components diagram
36
8.3
Parts list
37
9
Protecting the environment
38
10
Ten Year Limited Warranty
39
1
Warning
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.
combustible or corrosive vapors and liquids in the
vicinity of this or any other appliance.
Warning: Carefully plan where you
install the heater. Correct combustion
air supply and flue pipe installation are
very important. If a gas appliance is not
installed correctly, fatal accidents can
result from lack of air, carbon monoxide
poisoning or fire.
install the heater. Correct combustion
air supply and flue pipe installation are
very important. If a gas appliance is not
installed correctly, fatal accidents can
result from lack of air, carbon monoxide
poisoning or fire.
Warning: Exhaust gas must be vented
to outside using 3" single wall sealed
stainless steel vent pipe suitable for
category III vent systems and
temperatures up to 480°F. Vent and
combustion air connector piping must
be sealed gas-tight to prevent
possibility of flue gas spillage, carbon
monoxide emissions and risk of fire,
resulting in severe personal injury or
death.
to outside using 3" single wall sealed
stainless steel vent pipe suitable for
category III vent systems and
temperatures up to 480°F. Vent and
combustion air connector piping must
be sealed gas-tight to prevent
possibility of flue gas spillage, carbon
monoxide emissions and risk of fire,
resulting in severe personal injury or
death.
Warning: Place the recirculating water
heater in a location where water leaks
will do NOT DAMAGE adjacent areas
or lower floors.
heater in a location where water leaks
will do NOT DAMAGE adjacent areas
or lower floors.
Warning: Field wiring connections and
electrical grounding must comply with
local codes, or in the absence of local
codes, with the latest edition of the
National Electric Code, ANSI/NFPA 70,
or in Canada, all electrical wiring must
comply with the local codes and the
Canadian Electrical Code, CSA C22.1
Part 1.
electrical grounding must comply with
local codes, or in the absence of local
codes, with the latest edition of the
National Electric Code, ANSI/NFPA 70,
or in Canada, all electrical wiring must
comply with the local codes and the
Canadian Electrical Code, CSA C22.1
Part 1.
Warning: Shock hazard line voltage is
present. Before servicing the
recirculating water heater, turn off the
electrical power to the recirculating
water heater at the main disconnect or
circuit breaker. Failure to do so could
result in severe personal injury or death.
present. Before servicing the
recirculating water heater, turn off the
electrical power to the recirculating
water heater at the main disconnect or
circuit breaker. Failure to do so could
result in severe personal injury or death.