11
The 1/8″ NPT pressure tap for manifold pressure measurement is located on the side of the burner’s manifold pipe (see
figure 4). Use a “u”-tube manometer or dial type pressure gauge, scaled from 0″w.c. to 15.0″ w.c. (3736.5Pa) to read
pressure.
Figure 7
I. GAS PRESSURE SWITCHES
MOUNTING
All switches can be mounted in either horizontal or vertical position. Switches should be reasonably level but do not
require accurate leveling.
Switches have been factory calibrated and tested for leaks. However, it is recommended that the switch body, gas pipe
inlets and connections be soap bubble tested for leaks after installation.
OPERATION
Low Gas Pressure Models
Low gas pressure switches break the electrical circuit on pressure drop at the point when gas pressure becomes lower
than the indicated set pressure.
Before the manual reset button can be properly latched, gas pressure in the chamber must be higher than the indicated
setting.
High Gas Pressure Models
High gas pressure switches break the electrical circuit when pressure rises above the indicated preset pressure.
Range Adjustment - All Models
To adjust gas pressure cut-off setting, remove the cover. Turn the range scale adjustable knob to increase pressure
setting or decrease pressure setting. Install cover and tighten the cover screws to prevent tampering. Proper adjustment
of the high and low gas pressure switches is explained in section II.
Regulator Cap
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