Rheem Commercial Power Direct Vent Water heater Safety Precautions, HoneywellWhite-Rodgers

Operation

SAFETY PRECAUTIONS

A. Do turn off manual gas shut-off valve if water heater has been sub- jected to over heating, fire, flood, physical damage or if gas supply fails to shut off.

B. Do Not turn on water heater unless it is filled with water.

C.Do Not turn on water heater if cold water supply shut-off valve is closed.

D.Do Not store or use gasoline or other flammable vapors and liquids, such as adhesives or paint thinner, in vicinity of this or any other appliance. If such flammables must be used, open doors and win- dows for ventilation, and all gas burning appliances in vicinity should be shut off, including their pilot lights, to avoid vapors igniting.

NOTICE: Flammable vapors may be drawn by air currents from sur- rounding areas to the water heater.

2.TEMPERATURE SETTINGS — The thermostat is adjusted to its lowest temperature position when shipped from the factory. To meet com- mercial water use needs, it is adjustable up to 180°F (82°C). How- ever, water temperatures over 125°F (52°C) can cause severe burns instantly or death from scalds. This is the preferred starting point for setting the control for supplying general purpose hot water.

Safety and energy conservation are factors to be considered when setting the water temperature on the thermostat. The most energy ef- ficient operation will result when the temperature setting is the lowest that satisfies the needs consistent with the application.

Hotter water increases the Potential for HotWater SCALDS.

!DANGER

							0		1
						3			2
12						1		5		0
0	140		4	0	0			0
											0
			1		6						1
											1
											4
		0	0								0	1
			7									0
		1
												0
		6
					0
					8
				0				C°
					8
						1		F°

To adjust the water temperature, insert a small straight screwdriver into slotted screw in hole in front of ther- mostat and turn wheel to desired setting. Thermostat

is adjustable up to 180º F.

CAUTION!! - Hotter water increases the risk of SCALDING!

THERMOSTAT

HoneywellWhite-Rodgers

Figure 11. —Thermostat adjustment

E.Do not allow combustible materials such as newspaper, rags or mops to accumulate near water heater.

F.If there is any difficulty in understanding or following the OPERA- TION or MAINTENANCE instructions, it is recommended that a qualified person or serviceman perform the work.

!CAUTION

Hydrogen gas can be produced in a hot water system served by this water heater that has not been used for a long period of time (generally two weeks or more). HYDROGEN GAS IS EXTREMELY FLAMMABLE!! To dissipate such gas and to reduce risk of injury, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. Do not smoke or use an open flame near the faucet at the time it is open.

!WARNING

When this water heater is supplying general purpose hot water requirements for individuals, a thermostatically controlled mixing valve for reducing point of use water temperature is recommend- ed. Contact a licensed plumber or the local plumbing authority for further information.

Outlet water temperature will vary during normal operating cycles. Reli- able temperature readings should be taken shortly after main burner cycles off during a period of little or no use.

3.GAS MANIFOLD PRESSURE — With the gas valve supplied with this water heater, main burner ignition occurs at a low or step manifold pressure, which will then automatically build up to its normal operat- ing level . The rated operating manifold pressure is listed on the water heater rating plate. For purposes of input adjustment, the minimum inlet gas pressure(with main burner on) is also shown on the rating plate. A 1/8” NPT tapping is provided on the outlet side of the gas valve for connecting a manometer to check this pressure. If necessary, adjust the pressure to the proper value by turning regulator adjustment screw clockwise to increase pressure or counterclockwise to decrease pres- sure.

4.CHECK INPUT — Consult the local Gas Company to determine the heating value of the gas supplied. Check input by clocking gas meter with all other gas appliances turned off. Use the following formula:

INPUT (btu/h) =	(3,600) x (Heating Value) x (Number of Cubic Feet Timed)
	Seconds Clocked

!WARNING

DO NOT exceed Input shown on the water heater's rating plate!

16