Applied Air GAS-FIRED HEATERS, Installation & Operation Instruction

Page: 49 / 64

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To Calibrate the Building Pressure Transducer
(PT-13)
1. Remove the tubes at the Low and High pressure fi t-
tings.
2. The voltage at –COM and OUT should be 2.5 VDC.
If not adjust Z (do not adjust S).
3. Make sure the Low and High fi ttings are clean
and clear (do not insert any sharp objects into
the pressure fi ttings). Make sure the tubing is
also clean, clear of any debris and then reinstall
the tubes on the transducer. It is very important
that the High tube be placed inside the building,
and positioned so that air movement does not
affect it. The Low side should be to atmosphere,
and positioned so it is not exposed to the
weather.
4. With the use of a BACview 6 (KP-01) place the unit
in the Building Pressure mode. (See the Digital Con-
trol System User Manual).
5. The voltage at –COM and OUT will vary between 0
to 5 VDC. O VDC means the building is in a negative
pressure and should open the Outside Air/Profi le
and close the Return Air damper. 5 VDC means the
building is in a positive pressure and should open
the Return Air Damper and close the Outside Air/
Profi le Damper.
SETRA P/N
26510R1WBABT1C
MESTEX P/N
68.0330.69
RANGE
± .1 IN WC
PT-13
SECTION VII - TROUBLESHOOTING WITH DDC CONTROLS
continued