Installing Building Static Pressure Sensor Taps; Installing Discharge Air Temperature Sensor - Daikin Rebel Applied DPSA Installation And Start-Up Manual

Installing Building Static Pressure Sensor Taps

Please be careful when removing tubing from the fragile pressure sensor
fitting. Do not use excessive force or wrench the tubing back and forth when
removing the tubing. Excessive force and motion can break off and damage
the sensor.
Units that are selected with the capability for direct building
static pressure control require a reading of the building static
pressure. This requires that pressure taps be field installed and
plumbed back to the Building Static Pressure sensor (BSP) in
the unit. When present, the BSP sensor is found in the Low
Voltage Control Panel
Carefully locate and install the field provided pressure taps.
Improperly locating or installing the BSP pressure taps may
result in unsatisfactory operation. Consider the following
pressure tap locations and installation recommendations.
The installation must comply with all applicable local code
requirements.
1. Install a tee fitting with a leak-tight removable cap in each
tube near the sensor fitting. This facilitates connecting a
manometer or pressure gauge if testing is required.
2. Differentiate between the building pressure (HI) and
outdoor pressure (LO) taps by using different color tubing
or by tagging the tubes. Daikin recommends 3/16ʺ I.D.
plastic tubing.
3. Regardless whether the pressure in the controlled space
is to be positive or negative with respect to its reference,
the building pressure tap will be the HI pressure tap on
the Building Static Pressure sensor.
4. Locate the building pressure (HI) tap in the area that
requires the closest control. Typically, this is a ground
level floor that has doors to the outside. The location
must not allow the reading to be influenced by any
source of moving air (velocity pressure). These sources
may include air diffusers or outside doors.
5. Route tubing between the building pressure tap and
the Building Static Pressure sensor (HI) tap. The tubing
should be routed between the curb and the supply duct,
entering into the Main Control Panel through the Panel
Entrance Plate. See Figure 34 on page 29
recommended route for field installed tubing to the BSP.
IM 1287 • REBEL APPLIED ROOFTOP
CAUTION
for the
6. Locate the reference pressure (LO) tap in the area
surrounding the controlled space. Improperly locating the
reference tap may result in unsatisfactory operation.
7. If the reference pressure (LO) tap is to be located
outside, locate it away from condenser fans, walls,
or anything else that may cause air turbulence. The
reference pressure (LO) tap must be mounted high
enough above the roof or ground so that it is not affected
by snow. Additionally, use an outdoor static pressure
tip (Dwyer A306 or equivalent) to minimize the adverse
effects of wind. Place some type of screen over the
sensor to keep out insects. Loosely packed cotton works
well.
8. Route tubing between the reference pressure tap and
the Building Static Pressure sensor (LO) tap. The tubing
should be routed between the curb and the supply duct,
entering the Main Control Panel through the Panel
Entrance Plate. See
recommended route for field installed tubing to the BSP.
Seal the penetration to prevent water from entering.
Installing Discharge Air Temperature
Sensor
The discharge air temperature sensor should be installed in
the supply air duct. downstream of the rooftop unit. Locate
the sensor at a location that approximates the average duct
temperature. To avoid the affects of radiation, the sensor
should not be in direct line of sight with the gas furnace.
Generally, locate the sensor 5-10' from the unit discharge
and after one duct turn to allow for air mixing. Do not install
downstream of VAV boxes or other dampers.
1. Drill a 7/8" Diameter hole in the duct, insert the
temperature probe and secure plate to duct using 2-#10
screws.
2. Be sure to apply gasket or sealant to back of mounting
plate prior to screwing the plate to the duct to create an
air tight seal.
Figure 37: Temperature Sensor Installation
30
Installation
Figure 3 on page 6 for the
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