To check the draft:
Close all doors and windows to the outside.
Turn on all appliances that force air out of the building. These include all exhaust/ventilation fans, furnaces, clothes dryers, wood burning stoves, etc.
Open all doors between the AquaStar and these other appliances.
Run the unit for at least 10 minutes. Then hold an ordinary mirror at the side above the front shell. Any flue gases backdrafting will cause the mirror to fog. This is a serious health hazard and must be corrected. Poor venting can result in soot building up inside the heater, overheating of the heater and freezing of the heat exchanger in a freezing environment. The mirror will remain clear with a properly functioning draft.
WARNING
Note: The burners of an instantaneous “on demand” water heater such as the AquaStar are only on at the time that hot water is actually being used, the vent pipe is therefore cold except for the short durations when hot water is being used, it is therefore very important that the venting and air supply be adequate to provide a good positive draft as soon as the burners turn on.
The AquaStar 38B instantaneous water heaters have built- in draft diverters and are designed for indoor installation only. The draft diverter outlet must be connected to an unobstructed vent of the same size, or larger.
GAS CONNECTIONS and Gas Regulator
Before connecting the gas supply, check the rating plate on the right side of the front cover to be sure that the heater is rated for the same gas to which it will be connected.
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 INSTALLATION CODES and /or local installation codes. NOTE: The Aquastar 38 B is supplied with a gas pressure regulator that must be installed on the heater before attaching the gas supply line. See figure 2. Place the gas regulator between the gas supply connection (which comes with a manual shutoff valve) and the gas fitting wich is connected to the heater’s gas inlet. There is a pressure tap on this gas fitting. The regulator supplied with the heater is preset for the gas shown on the rating plate to the correct pressure. It is an appliance level regulator designed for low inlet pressure (less than 1/2 Psig or 15” W.C.) DO NOT connect to an unregulated or high pressure propane line or to a high pressure commercial natural gas line.
In Canada,
In U.S.A., ANSI Z223.1 - NFPA 54, National Fuel Gas Code for detailed requirements.
INLET GAS FITTTING
WITH GASKET
1/2” BRASS BUSHING
GAS
COCK
PRESSURE TAP
PLASTIC VENT CAP
PRESSURE
REGULATOR (with directional arrow on reverse side pointing upward)
APPLIANCE GAS
REGULATOR
Fig. 2 - Gas Pressure Regulator
The pressure regulator provided with the heater is adjusted to deliver the proper gas pressure (as indicated on the rating plate and in the manual for altitude up to 2000 feet (660 meters) above sea level. On appliances being installed above 2000 ft (660 meters) elevation, the inlet gas pressure should be set at installation to the value shown below.
NOTE: The gas pressures specified below refer to pressures taken at the pressure tap on the gas inlet pipe just above the regulator (See Fig 2). These readings should be taken while the heater is operating at full input
—i.e. maximum water flow with the temperature dial selector turned all the way clockwise.
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