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MODEL GWH 1000 P
INDOOR MODEL
Standing pilot
Suitable for heating potable water only
Not approved for space heating or preheated water applications
MODEL GWH 1000 P NG - Natural Gas
MODEL GWH 1000 P LP - Liquefied Petroleum (LP) Gas
Warning: If the information in this manual is not What to do if you smell gas
followed exactly, a fire or explosion may result
Open windows.
causing property damage, personal injury or death.
Close gas valve.
Do not store or use gasoline or other flammable
Do n
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Index Index 1 Warning 1 Warning 2 2 Appliance details 3 2.1 GWH 1000 P specifications (Technical data) 3 Warning: The heater must be isolated 2.2 Unpacking the GWH 1000 P heater 4 from the gas supply piping system 2.3 General rules to follow for safe operation 4 during any pressure testing of that 2.4 Dimensions and installation clearances 5 system at test pressures equal to or more than 0.5 psig. 3 Installation instructions 6 3.1 Introduction 6 3.2 Proper location for installing your heater 6 C
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Appliance details 2 Appliance details Dimensions 2.1 GWH 1000 P specifications (Technical data) Depth (in): 8.66 (220 mm) Width (in): 12.20 (310 mm) Approved in US/Canada Height (in): 22.83 (580 mm) Capacity Weight: 26 pounds (12 kg). GWH 1000 P: 2.6 GPM Gas types Maximum output Natural Gas GWH 1000 P: 58 400 Btu/hr LP Gas Maximum input Safety devices GWH 1000 P: 74 900 Btu/hr Flame failure device (ionization thermocouple) Efficiency in % Pressure relief valve (supplied with heat
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Appliance details 2.2 Unpacking the GWH 1000 P heater 2.3 General rules to follow for safe operation This heater is packed securely. 1. You should follow these instructions when you Before installing the unit, be certain you have the install your heater. In the United States: The correct heater for your type of Gas - Propane or installation must conform with local codes or, in the Natural Gas. Identification labels are found on the absence of local codes, the National Fuel Gas Code shipping b
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Appliance details 2.4 Dimensions and installation clearances Fig. 3 Dimensions in Inches and (mm) 4 Heat exchanger 5 Burner Dimensions inches 10 Temperature control (mm) 11 Water valve 20 Gas connection GWH 1000 P 26 Output control 36 Front cover A 12.20 (310) 37 Hole for fixing to wall 38 Exhaust pipe to connector B 22.83 (580) 39 Draft diverter with flue gas monitor C 9 (228) 40 Gas valve 49 Observation window D 4 (100) 102 Piezo E 20.71 (526) F 2.36 (60) G 1 (25) H 1/2 Table 1 Dimens
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Installation instructions 3 Installation instructions 3.1 Introduction Warning: The heater must be isolated from the gas supply piping system Please follow these instructions. Failure to follow during any pressure testing of that instructions may result in: system at test pressures equal to or B Damage or injury. more than 0.5 psig. B Improper operation. B Loss of warranty. Warning: Place the heater in a location If you are unable to perform the tasks required to install where water leaks will d
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Installation instructions 3.4 Mounting Heater Warning: before starting installation: B check that there are no loose parts inside the appliance B ensure that gas pipe, gas valve, and burner have no damage and are properly fitted. B Read chapter 2.2 to verify proper gas type and to check all parts are included in box. Front cover should be removed in order to inspect components visually (see i instructions below). Fig. 6 Remove front cover Remove cover and inspect. B Remove the temperature cont
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Installation instructions Fuel Gas Code for complete information. In buildings of 3.5 Combustion air requirements tight construction all air should be taken from outside. The AquaStar water heater holds cold water in its copper heat exchanger and water valve when not in use. Because of this, any cold air that comes down through the unit's vent pipe is capable of freezing these components. This Installation Manual specifies the minimum vertical vent pipe and the amount of combustion air required
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Installation instructions Keep the horizontal section short and avoid too many 3.6 Venting elbows. The maximum horizontal run allowed is half of the total vertical vent height; horizontal vent connectors Danger: Do not reduce the vent pipe and elbows are not to be considered in the total gas size. Do not put an elbow directly on top vent height. of heater. Failure to follow venting requirements may cause dangerous Vent termination: exhaust gases to enter living space. The gas vent constructed o
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Installation instructions Masonry chimney GAS VENT TERMINATIONS FOR LISTED VENT CAPS Masonry chimneys shall be built and installed in Roof pitch H (minimum) feet meters accordance with NFPS 211 or local codes. A minimum Flat to 6/12 1.0 0.30 4" diameter gas vent pipe (metal double wall Type B), 6/12 to 7/12 1.25 0.38 or an approved clay flue liner or a listed chimney lining Over 7/12 to 8/12 1.5 0.46 system must be used when venting into a naturally Over 8/12 to 9/12 2.0 0.61 drafting, internal
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Installation instructions B Attach the appliance regulator to the inlet gas pipe. 3.7 Gas piping & connections B The minimum diameter required for any appliance Before connecting the gas supply, check the rating connector used is ½. plate on the right side of the heater to be sure that the B National Fuel Gas Code requires that a sediment heater is rated for the same gas to which it will be trap (drip leg) be installed on gas appliances not so connected. equipped. The drip leg must be accessib
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Installation instructions FOR NATURAL GAS Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands. Copper tubing is prohibited for use with Natural Gas in the Commonwealth of Massachusetts and not recommended elsewhere. Follow boxed numbers for piping just one GWH 1000 P (example: ¾ B.I. Natural Gas pipe for 20 ft (6.1m). will handle 190
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Installation instructions Although water piping throughout your structure may be 3.8 Measuring gas pressure other than copper, we recommend that copper piping Connecting manometer or suitably rated stainless steel flex line piping be used for at least three feet before and after the heater (follow B Shut off gas. local codes if more stringent). Never sweat any rigid B Remove front cover and locate inlet gas pressure piping directly to or beneath the water connections or measuring point on the ri
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Operation instructions 4 Operation instructions 4.1 For your safety read before operating your water heater Warning: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. Note: Upon initial installation, existence of air in the gas supply i line and in the water line may cause some ignition delay. In that case, repeat the ignition process until all the air has been purged. Fig. 15 Plumbing connections and pressu
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Operation instructions B With the gas valve button fully depressed, light pilot 4.2 Lighting instructions by pushing the piezo button. This step may have to B STOP! Read the previous safety information. be repeated. B The gas valve must be turned off by sliding the gas valve button to all the way to the left. Fig. 17 Fig. 20 B Wait five (5) minutes to clear out any gas. If you smell gas, STOP! Follow B in the safety information B Observe the pilot flame through the peephole. The above on th
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Operation instructions ensure that the hot water temperature will remain steady, although the water flow demand might vary. The output temperature can be adjusted with either the temperature adjustment knob or the gas control slide. Temperature adjustment knob The temperature adjustment knob on the front bottom of the heater (see Fig. 22) adjusts temperature by adjusting flow capacity. See table 4 for details. Fig. 24 4.5 Draining water from heater If there is a risk of freezing, proceed as foll
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Maintenance and service 5 Maintenance and service by removing the retaining clip on water valve assembly 5.1 Maintenance intervals and pulling the pipe free from the water valve. Loosen the two set screws at the bottom of the water valve Warning: Failure to perform where it connects to the gas valve. If the set screws are recommended maintenance may result seized, STOP and call Bosch tech support before in complete failure of the unit over time. proceeding. Forcing and snapping seized set screw
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Maintenance and service 12. Run solution through the heat exchanger until the 5.4 Main burners solution returning to the descaling reservoir comes out The main burner flames should be blue, with a more clear. (Changing to a fresh solution may be necessary intense blue cone in the center core. Yellow flames during this process). could be a sign of wrong size gas orifices or dirty 13. Disconnect all lines and drain all solution from heat burners, a blockage on the heat exchangers fins. If exchange
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Troubleshooting 6 Troubleshooting 4. Pilot flame should be blue in color and completely 6.1 Introduction engulfing the tip of the thermocouple. If not, have a Many of the questions customers ask regarding licensed gas technician verify gas pressure is in operation of this unit can be answered by following the accordance with manufacturer's specifications troubleshooting steps as outlined below. Visit our web (chapter 3.9) and clean or replace the pilot orifice site at www.boschhotwater.com for m
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Troubleshooting heat exchanger are available at point, which shuts off the burners. The end result is www.boschhotwater.com. nothing but cold water coming out of the outlet. Reduce the need for cold water mix by setting the gas 8. If steps 1 through 7 do not correct the problem, then slide control button towards the single flame position confirm that the gas pressure is adequate. Ensure gas for lower hot water temperatures. If the problem pressure is in accordance with manufacturer's persists,
