IPF
Page 17
To re-connect current wiring in N-type IPF’s,
connect the wires with the same color (black-to-
black, and red-to-red). Use a crimping tool to
secure the connection.
6. Reseat IPF faceplate, and secure it using the
Phillips-head screws, and re-secure the top
cover of the housing.
7. Calibrate unit. Refer to Calibration Section of
this manual.
Drain Check.
System filters have automatic drains,
which depend on the fluctuation of system pressure
to induce drainage. A stable system may not drain
efficiently.
Periodically check for clogs, and drain system’s
filters by pushing the drainage valve with a small
probe or wire.
Troubleshooting
Many components of the IPF have been thermally
aged, tested, and selected using a computer-aided
design program. This usually makes field repair
unnecessary.
It is therefore recommended that any properly
maintained unit found to be performing below
specifications be returned to the factory in accor-
dance with the instructions found on the back cover
of this manual.
If a problem is suspected with the IPF, review the
following steps:
1. Verify that bench instruments used to take
measurements have the proper range and
accuracy and are within current certification
period limits.
2. If a change in the relationship between the input
and output is detected, attempt a re-calibration of
the IPF.
3. If the response time lengthens, or if the span
drops, this may indicate a blockage due to air
supply contamination. Follow the instructions in
the Maintenance Section of this manual.
The Zero Adjust Screw.
This screw has a flange to
prevent its being turned too far counterclockwise
during adjustment. Forcing the screw past the point
at which its flange comes into contact with the unit
front panel could disengage it from the internal
assembly.
If this happens, disassemble the IPF as described in
the Maintenance Section of this manual.
Visually inspect the screw, and if serviceable, hold
down the flapper arm, and turn the screw clockwise
until its pin is in a position to hold the arm.
Refer to the Calibration Section of this manual, and
perform a unit recalibration.
