Armstrong World Industries 243 pressure, Rise”, “Pressure, Fall”, What Is Needed for the Tests

Service Reference Manual UNIT COMPONENTS

5-25

What Is Needed for the Tests

•A good general-purpose incline manometer with a range of 0 - 3" W.C. (Dwyer 1227 or equivalent).

•Use the parts list to verify that the proper pressure switch is installed in the unit. Look for the Armstrong part number stamped on the metal housing. A label on the housing shows the manufacturer’s model number.

•Find the Switch Open value for the pressure switch in Table 5-4 on page 22.

•Assorted lengths of plastic tubing and tees to make the connections to the manometer including the following: 1/8" I.D. high temperature silicone tubing, 1/4" I.D. vinyl tubing, 1/8" tee and 1/4" tee.

Note: For each procedure, the schematic shows the original factory tubing with solid black lines. The tees to be installed for pressure sampling are shown within the dashed circles.

Terminology

Terms related to pressure switch operation and incline manometer testing are shown below in Figure 5-19.

BA

-1"

0

1"

2"

3"

“Negative”		pressure
“Positive”
	pressure
“Pressure
	Rise”
“Pressure
	Fall”

FIGURE 5-19 Incline Manometer

SRM-HW/HWC 2/99