Appliance details
2.2Unpacking the GWH 425 PN heater
This heater is packed securely.
Before installing the unit, be certain you have the correct heater for your type of Gas - Propane or Natural Gas. Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover.
Fig. 2 Rating plate
ASerial number
B Type of gas
The box includes:
Pressure relief valve
Mounting screws
Product registration card
Installation manual
Incandescent particle tray.
Do not lose this manual, there is a charge for a replacement.
Please complete and return the enclosed product registration card.
The GWH 425 PN is not approved or designed for:
Manufactured (mobile) homes, RV's or boats Heating or other recirculating/pumping applications*
Solar/preheat backup or high temperature booster use
Installation in a bathroom.
*This includes domestic hot water circulator pump loop systems that may be installed in home hot water system prior to installing this unit. An approved recirculation design can be found in chapter 3.10. Contact BBTNA if further instruction is needed.
2.3General rules to follow for safe operation
1.You should follow these instructions when you install your heater. In the United States: The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/ NFPA 54.
In Canada: The Installation should conform with CGA B149.(1,2) INSTALLATION CODES and /or local installation codes.
2.Carefully plan where you install the heater. Proper clearances must be followed.
3.The appliance must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve (not supplied with heater) during any pressure testing at pressures in excess of ½ Psig (3.5 kPa).
The appliance and its gas connection must be leak tested before placing the appliance in operation.
4.Keep water heater area clear and free from combustibles and flammable liquids. Do not locate the heater over any material which might burn.
5.Correct gas pressure is critical for the optimum operation of this heater. Gas piping must be sized to provide the required pressure at the maximum output of the heater, while all the other gas appliances are in operation. Check with your local gas supplier, and see the chapter 3.7 and 3.8 to verify proper gas line sizing.
6.Should overheating occur or the gas supply fail to shut off, turn off the gas supply at the manual gas shut off valve, on the gas line. Note: manual gas shutoff valve is not supplied with the heater.
7.Do not use this appliance if any part has been underwater. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been underwater.
BOSCH is constantly improving its
iproducts, therefore specifications are subject to change without prior notice.
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