WattMaster Water Source Heat Pump, Installation & Operation Manual, Page: 45 / 126

WattMaster WHP Section 2
Installation and Wiring 2-21
Supply Air Temperature
Sensor
The supply air temperature sensor should be located in the duct, as close to the rooftop
unit discharge as possible for best response.
Locate the sensor in the center of the widest part of the duct. Use the supplied template
and a 5/16" drill to make a hole for the sensor. Install the gasket over the probe and
mount securely to the duct using the supplied sheet metal screws. Be sure the gasket is
compressed to provide an air tight seal.
For best accuracy, apply insulation on the outside of the duct, over the sensor. This will
help prevent thermal gradients from affecting the sensor.
Figure 2-16: Supply Air Temperature Sensor
Mounting Plate
Gasket
Adhesive Backed Drill Guide
Mounting Template
11-1/2" (OE231)
5-1/2" (OE230)
Mounting Plate
4.0"
3/4"
1/4" Hex Head Sheet Metal Screws
Thread
Together
Duct Work
Drill 5/16" Hole In Ductwork For Probe
Leads Are Non-polarized.
Butt Splice Leads To 24 Gauge
Wire Minimum. Connect Leads
To "Analog In" And "Ground"
At Controller.