Bosch Appliances GWH-345/450-ESR-L, GWH-345/450-ESR-N manual Index, For your safety

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

3.9Checking restrictor plate size by measuring CO2 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

1Warning

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.

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.

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.

Warning: Place the recirculating water 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.

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.

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