Daikin Rebel DPS Series Installation And Maintenance Manual page 17

Discharge Air Temperature Sensor
The discharge air temperature sensor must be installed in the
discharge air duct, downstream of the rooftop unit. Locate the
sensor in a location that closely approximates the average
duct temperature. To avoid the effects of radiation, the sensor
should not be in the line-of-sight of a gas furnace or electric
heater. Generally, locate sensor in the center of a duct wall,
5' – 10' from unit opening to allow for air mixing. Do not mount
down stream of VAV boxes or other dampers.
Installation: Drill 7/8" diameter hole in duct, insert sensor probe
and secure plate to duct with 2 – #10 screws. Be sure to apply
gasket or silicone sealant to back of mounting plate prior to
screwing plate to the duct to create an air-tight seal.
NOTE: If there is a stratification concern up to 4 sensors can
be utilized with an averaging signal. Sensors must be
wired in parallel.
Figure 16: Discharge Air Temperature Sensor Installation
Pre-Construction
The Rebel unit comes equipped with a Microtech III controller
and can be used for sites that are still under construction. The
following conditions must be met.
1 . Ductwork has to be installed. The fan proving switch
and furnace might not run correctly without the specified
external static pressure
2 . Filters must be installed .
3 . Follow furnace commissioning instructions found in the
furnace section.
4 . After substantial completion of the construction process
the unit is to be thoroughly cleaned. Special attention
should be paid to the indoor DX coil and the furnace.
Filters should be changed
5 . Furnace operation, rate, and temperature rise should be
re-verified. See instructions found in the furnace section.
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Lab Pressurization Applications
1 . Install a "T" 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 . Use different colored tubing for the controlled space
pressure (high) and reference pressure (low) taps, or tag
the tubes.
3 . Regardless whether the controlled space is positive or
negative with respect to its reference, locate the high
pressure tap in the controlled space (the setpoint can be
set between -0.2" and 0.2" wc).
4 . Locate the reference pressure (low) tap in the area
surrounding the controlled space. Not locating the
reference tap to the sensor results in unsatisfactory
operation .
5 . Locate both taps so they are not influenced by any source
of moving air (velocity pressure). These sources may
include air diffusers or doors between the high and low
pressure areas .
6 . Route the building tap tube between the curb and the
supply duct and feed it into the unit through the knockout
in the bottom of the control panel.
7 . Connect the tube to the (high) fitting for sensor SPS2.
17
Mechanical Installation
IM 1125-13 • REBEL ROOFTOPS