6
Troubleshooting
Troubleshooting l 6-15
Replacing the Air Flow Differential
Pressure Switch (continued)
6Remove the mounting hardware securing the
pressure switch to the heating element enclosure.
7Align the new pressure switch with the mount-
ing holes and secure it to the heating enclosure
using the original mounting hardware.
8Connect the hose coming from the heater outlet
to the low pressure side of the switch and the
hose coming from the heater inlet to the high
pressure side of the switch.
9Connect the two wires to their original location on the pressure switch.
10 Test the system to insure that the new air flow differential switch is detect-
ing the pressure drop between the heater inlet and outlet.
11 Reinstall the heating element coveron the enclosure.
12 Connect the hose coming from the heater outlet to the low pressure side
of the switch and the hose coming from the heater inlet to the high pres-
sure side of the switch.
13 Connect the two wires to their original location on the pressure switch.
14 Test the system to insure that the new air flow differential switch is detect-
ing the pressure drop between the heater inlet and outlet.