Transducer Checkout Procedure; Quick Test Procedure For Mediamate Water Pressure Transducer - Trane CVHE Troubleshooting Manual

Quick Test Procedure For Mediamate Water Pressure Transducer

1. Set regulated power supply to 5 VDC. Connect 5 VDC to Pins 2 and 4 on the Trans-
ducer.
2. Check zero balance at ambient pressure by attaching Transducer lead wires of a Dig-
ital Volt Meter to Pin 1 and Pin 3 of the Transducer.
~ Pin 4 Excitation (Supply)
~ Pin 2: Excitation (Supply)
~ Pin 1: Signal Connect Volt Meter
~ Pin 3: Signal
(A cable assembly with a mating Hirschmann connector could be made up and used for all tests.)
Allow transducer to stabilize under power (approximately 15 - 30 seconds).
Readings:
1 Transducer used for Condenser Pressure, Oil Discharge Pressure and Oil Sump. Trane Part
Number TDR0272. A good Transducer reading is: 15 mV ± 1mV
2 Evaporator and Condenser Water Flow Transducer and Part Number TDR0274 A good
Transducer reading is: 0 mV ± 1 mV.
3. Insert a Q-Tip or small wooden dowel into the pressure port and gently apply force to
the diaphragm and watch the DVM for a corresponding change in output.
CVHE-SB-32A

Transducer Checkout Procedure

Transducer
RED
BLK
+5 VDC
4
+DIF -DIF
3
4R1
1
2
GND
Connect 5 VDC Power Supply
>
P9A
1
+5VDC
2
GND
3
GND
WHT
4 -
GRN
+
5
J9
Circuit Module
Excitation
Oil Sump Pressure
(TYP)
Signal
83