Installation, Operation and Maintenance Manual
Marvel Plus
8
Subject to change without notice.
120.5-IM (1018)
STATIC PRESSURE TRANSDUCER
(DUCT MOUNT) WITH VAV OPTION
MOUNTING
The static pressure transducer shown in Figure 3 – Pressure
Transducer must be installed in the main supply air ducting
at a location approximately two-thirds of the distance down
the straightest duct run from the supply air outlet of the unit�
The location must be a non-turbulent area of supply air flow.
Mount the pressure transducer as follows:
1.
Remove the pressure transducer’s cover plate screws
using a Phillips head screw driver�
2.
Select the mounting location� Install the sensor at the
approximate mid-point/center of the vertical plane of
the ducting�
3.
The sensor must be mounted vertically with the
electrical entrance/strain relief facing downward�
4.
Drill a 1/2” hole through the face of the duct�
5.
Before installing the duct pressure transducer, make
sure the gasket at the base where the duct probe
meets the transducer housing is intact and sealed to
the sensor (so that it will seal the perimeter of the hole
drilled)�
6.
Insert the probe into the duct and mount the pressure
transducer using two (2) field provided #8 sheet metal
screws�
WIRING
Using a minimum 18-20 AWG 300 volt rated two conductor
shielded cable with drain wire make the following electrical
connections�
IMPORTANT:
Please observe polarity of this sensor� The “+”
is +24 vdc and the “–“ is the output (4-20 mA) to the Analog
Input of the controller�
7.
Connect from the positive terminal “+” inside the
pressure transducer to the unit’s electrical terminal
block TB-DMPT +�
8.
Connect from the negative terminal “–” inside the
pressure transducer to the unit’s electrical terminal
block TB-DMPT –�
9.
Connect the drain wire to ground at the unit end only�
FIGURE 1 – PRESSURE TRANSDUCER
