Trane CVHG Troubleshooting

CVHE-SB-32A 83
Transducer Checkout Procedure
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) > Connect 5 VDC Power 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.
Transducer Circuit Module
Excitation
Oil Sump Pressure
(TYP)
Signal
+5VDC
GND
GND
-
+
J9
WHT
GRN
RED
BLK
P9A
+5 VDC
GND
4R1
1
2
3
4
1
2
3
4
+DIF
-DIF
5

Trane CVHG Specifications

General

Brand	Trane
Model	CVHG
Category	Chiller
Language	English