Form: AZ2-OE275-03-A-SuctPressSensorKit-1B.doc Page 1 of 1
Description
The OE275-03 Suction Pressure Transducer Kit
is comprised of the OE275-01 Suction Pressure
Transducer, an E-BUS Adapter Board, and a 3
foot EBC E-BUS cable. It is required for any AZ
2 Controller application with DX Cooling that
requires Dehumidification. The Suction
Pressure Transducer is used to measure
suction pressure at the HVAC unit’s DX
evaporator coil suction line. This suction line
pressure is converted to saturated refrigerant
temperature by the AZ 2 Controller. This
temperature is used by the AZ 2 Controller to
accurately control the compressors to provide
optimum performance from the system during
Dehumidification operation.
The Suction Pressure Transducer connects to
the E-BUS Adapter Board’s V, SIG, and GND
terminals through a cable. The cable is supplied
with a 3-pin Packard mating connector for
attachment to the sensor on one end and has 3
color-coded stripped wires on the other end.
The stripped wire ends can be spliced to other
wires to extend the wiring length when required.
The EBC E-BUS Cable connects to the E-BUS
Adapter Board. This cable must then connect to
the AZ 2 Controller directly or to an AZ 2
Expansion Board connected to the AZ 2
Controller.
The OE275-03 Suction Pressure Transducer’s
metal wetted parts are made from stainless
steel and Haynes 214 alloy. The Suction
Pressure Transducer is weather resistant.
Connection to the pressure source is
accomplished by screwing the 1/4” SAE female
Schrader fitting on the Suction Pressure
Transducer onto a 1/4” Schrader male valve
fitting (by others) that is welded into the suction
line. The Suction Line Transducer provides a
0.5 to 4.5 VDC output in response to a 0 to 250
PSIG pressure. Transducer accuracy is 0.25%
of the full scale of the transducer.
OE275-03
Suction Pressure Transducer Kit
Technical Data OE275-03 Suction
Pressure Transducer Kit
Operating Pressure Range -0 to 250 PSI Gauge Power Input 5 VDC
Operating Temp
-40F to 185F
Signal Output 0.5 to 4.5 VDC
Wetted Parts Construction Stainless Steel Electrical Cable Connection 3 Pin Packard Connector
Sensor Construction Haynes 214 Alloy Electrical Cable Length 3 Feet
Pressure Fitting Construction Stainless Steel Accuracy
0.25% of Full Scale
Pressure Fitting Size 1/4” SAE Female
Schrader Fitting
Hysteresis
0.1% of Full Scale
Non-repeatability
0.05% of Full Scale
Weight 2.3 Ounces Response Time
0.05% of Full Scale
Three Year Warranty
WattMaster reserves the right to change specifications without notice
2.18
0.50
0.63
1.28
1.06
1/4” SAE Femal
Schrader Fitting
Common
(Black)
Not Used
(Red)
+ Excitation
- Output
(White)
Top View
EBC E-BUS Cable
E-BUS Adapter Board
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