Orion System OE217-00 - Manual (Page 38)

Form: ORION-OE275-03-A-SuctionPressureSensorKit-wE-BUS-Adapter-1B.doc
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Description
The OE275-03-A Suction Pressure Sensor Kit
with E-BUS Adapter 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 VCB-X application with DX
Cooling that requires Dehumidification. The
Suction Pressure Transducer is used to meas-
ure suction pressure at the HVAC unit’s DX
evaporator coil suction line. This suction line
pressure is converted to saturated refrigerant
temperature by the VCB-X Controller. This tem-
perature is used by the VCB-X 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 at-
tachment 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 VCB-X Controller directly or to a VCB-X
Expansion Board connected to the VCB-X Con-
troller.
The OE275-03-A Suction Pressure Transduc-
er’s metal wetted parts are made from stainless
steel and Haynes 214 alloy. The Suction Pres-
sure Transducer is weather resistant. Connec-
tion 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. Trans-
ducer accuracy is
 0.25% of the full scale of
the transducer.
Technical Data OE275-03-A Suction
Pressure Sensor Kit with E-BUS Adapter
Operating Pressure Range -0 to 250 PSI Gauge Power Input 5 VDC
Operating Temp -40
F to 185F 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 Female
Schrader Fitting
Common
(Black)
Not Used
(Red)
+ Excitation
- Output
(White) Top View
EBC E-BUS Cable
E-BUS Adapter Board
OE275-03-A Suction Pressure Sensor Kit
With E-BUS Adapter Board