Amana RST, RSS Measuring Gas Pressure, Using The Manometer, Installation Instructions

INSTALLATION INSTRUCTIONS

After the oven has cycled for 25 to 30 minutes, note the zero level. temperature that the oven cycles ON and OFF. For

example, at 350° setting the oven cycles between 335° and 355°. This provides a mean or average temperature of 345°F., well within the ±25°F specification.

GAS PRESSURE

Correct ignition and operation of the burners are dependent upon adequate gas pressure. The regulator is designed to provide pressure of approximately six (6) inches water column pressure (WCP) for natural gas and approximately eleven (11) inches for WCP for liquid propane (LP) gas, provided the universal type gas regulator and gas valves have been correctly set up for the type gas employed.

These pressures therefore require that the minimum supply pressure to the regulator must be at least six (6) inches WCP for natural gas and eleven (11) inches WCP for LP gas, with maximum pressure not to exceed fourteen (14)

inches WCP.

Figure 33 - The Mannometer

MEASURING GAS PRESSURE

Equipment for measurement of gas pressure varies from pressure meters and gauges to the relatively simply and most commonly used manometer. If it is used, follow the directions supplied with the unit. The following informations covers the use of a manometer.

A manometer is simply a U-shaped tube of clear plastic or glass (see illustration). A scale in inches is located between the two (2) legs of the "U". In use, the tube is filled with sufficient water to achieve a level at "0" inches. One end of the tube is connected to the range manifold or gas valve orifice while the other end of the tube or leg is open. When gas pressure is applied, the water on the gas side of the tube is pushed down and the water in the other leg rises up against the atmospheric pressure on the open end. The sum of the readings below the zero level and above the level will provide the gas pressure in inches water column, or the water column height which the gas pressure will support against the atmospheric pressure on top of the water column. The manometer therefore indicates gas pressure in inches water column. This conforms with the gas specifications for gas appliances which are given as inches WCP or inches water column pressure.

USING THE MANOMETER

The usual procedure for taking the pressure reading is to connect the tubing to one of the gas valve orifice hoods and turn on the valve. A full load reading should be taken by

turning on all of the top burners and the oven burner to
assure that the pressure under a full load is adequate.
Figure 33 shows four (4) inches water column pressure
(WCP), two	(2) inches above and two (2) inches below the
RC231002	Rev. 3	20