Standard Range ZPM - Zone Pressure Sensor
in a BAPI-Box Enclosure
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:[email protected] • Web:www.bapihvac.com
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Installation & Operations
47138_ins_ZPM_SR_BB
rev. 04/13/22
AUTO-ZERO FOR STANDARD UNITS
Auto-Zeroing must be done after the initial setup, changing mounting orientation or changing any settings. For most
applications, perform an auto-zero whenever it appears that the sensor has drifted. For critical applications, the unit
should be zeroed 2-3 times a year.
1. Power must be on.
2. Detach system tubing and deadhead ports using the supplied
tubing or other short length of tubing. Do not kink tubing.
3. Press and hold the Auto-Zero button for 1-2 seconds. The
Status LED will stop flashing when completed.
4. Remove deadhead tubing and reattach system tubing.
AUTO-ZERO FOR UNITS WITH ATTACHED TUBE
1. Power must be on.
2. Disconnect system tubing from the Low Pressure brass fitting
and attach the supplied 6” deadhead tubing to the brass fitting.
3. Disconnect the short clear tubing from the 90° black Attached
Tube fitting with your fingers (Fig. 9). A pliers may cut the tubing.
4. Connect the clear tubing to the supplied straight black fitting on the 6”
tubing (Fig. 9). Do not kink the tubing.
5. Press and hold the Auto-Zero button for 1-2 seconds. The Status
LED will stop flashing when completed.
6. Disconnect the deadhead tubing and reattach the clear tubing and
system tubing. Confirm that the clear tubing is pressed all of the way
onto the fitting and that it is not kinked.
Fig 8:
Auto-Zero and Status LEDs
Auto-Zero
LED
Status
LED
STATUS LED OPERATION
LED Off:
No power is applied or the unit is in 4 to 20 mA Mode
LED Solid (On):
LED is on when power is applied and a VDC
output is selected. When 4 to 20 mA output is selected, the light is
on for 2 seconds at power up then goes off.
LED Flashing:
Auto-Zero. The LED will flash for about 20 seconds.
Output Termination
BAPI recommends wiring the product with power disconnected.
Proper supply voltage, polarity and wiring connections are
important to a successful installation. Not observing these
recommendations may damage the product and void the warranty.
PWR
Terminal
GND
Terminal
OUT
Terminal
Fig. 7:
ZPM Wiring Terminals
To ensure that all wires are properly terminated, twist the stripped ends of each
wire together before inserting into the terminals. Gently tug on the wire after
inserting into the terminal to verify a good connection.
Auto-Zero Procedure and Status LED Operation
Output Signal
PWR Terminal
GND Terminal
OUT Terminal
4 to 20 mA
7 to 40 VDC
4 to 20 mA Signal To
Controller Analog Input Not Used
0 to 5 or 1 to 5 VDC
7 to 40 VDC
or 18 to 32 VAC
To Controller Ground
VDC Signal To Controller
Analog Input
0 to 10 or 2 to 10 VDC
13 to 40 VDC
or 18 to 32 VAC
To Controller Ground
VDC Signal To Controller
Analog Input
Table 1: ZPM Termination
Fig 9:
Deadheading
ports on units with
attached tube (-AT)
Supplied
6” tubing
Supplied
straight
black fitting
for dead-
heading
High
Port
Low
Port
High
Pressure
Port
Low
Pressure
Port
