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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 combustion 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
22
3.7
Gas piping & connections
23
3.8
Measuring gas pressure
25
3.9
Checking restrict. plate size by measuring CO
2
level value 26
3.10
Water connections
26
3.11
Electrical connections
27
4
Operating instructions
28
4.1
Initial filling instructions
28
4.2
For your safety read before operating your water heater
28
4.3
Startup instructions
28
4.4
Power 29
4.5
Recirculating water temperature
29
4.6
Temperature and hot water flow
29
4.7
Freeze protection
29
4.8
Electrical diagram
30
5
Maintenance and service
31
5.1
Diagnostic mode
31
6
Altitude adjustments
33
7
Troubleshooting 34
8
GWH-345/450-ESR Functional scheme
36
9
Interior components diagram and parts list
37
9.1
Interior components
37
9.2
Components diagram
38
9.3
Parts list
39
10
Protecting the environment
40
11
Ten Year Limited Warranty
41
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.
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 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.