Quantech QTC3040T User Manual

Quantech
186
Form QTC3-NM1
Issue date: 12/19/2023
Section 9: Service and troubleshooting
Table 32: Entering/Leaving Chilled Liquid Temp. Sen-
sor, Temperature/Voltage Correlation
TEMP °F
VOLTAGE
(Signal Input
to Return)
TEMP °C
10 1.33 -12
12 1.39 -11
14 1.46 -10
16 1.51 -9
18 1.58 -8
20 1.65 -7
22 1.71 -6
24 1.78 -4
26 1.85 -3
28 1.91 -2
30 1.98 -1
32 2.05 0
34 2.12 1
36 2.19 2
38 2.26 3
40 2.33 4
42 2.40 6
44 2.47 7
46 2.53 8
48 2.60 9
50 2.65 10
52 2.73 11
54 2.80 12
56 2.86 13
58 2.92 14
60 2.98 16
62 3.05 17
64 3.11 18
66 3.17 19
68 3.23 20
70 3.29 21
72 3.34 22
74 3.39 23
76 3.45 24
78 3.5 26
80 3.54 27
Liquid and refrigerant sensor test points
See Table 32 on page 186.
Entering chilled liquid sensor
J6-5 = +5 VDC regulated supply to sensor.
J6-8 = VDC input signal to the I/O board. See Table
32 on page 186for voltage readings that cor-
respond to specific liquid temperatures.
J6-2 = drain (shield connection = 0 VDC) Return
Leaving chilled liquid temperature sensor
J6-4 = +5 VDC regulated supply to sensor.
J6-7 = VDC input signal to the microboard. See Table
32 on page 186for voltage readings that cor-
respond to specific liquid temperatures.
J6-1 = drain (shield connection = 0 VDC) return
Analog inputs, pressure
See the unit wiring diagram. Pressure inputs are con-
nected to the microboard on plugs J7 and J9. These an-
alog inputs represent varying DC signals correspond-
ing to varying pressures. All voltages are in reference
to the unit case (ground).
System 1 discharge and suction pressures will be con-
nected to J7 of the microboard. System 2 discharge and
suction pressure transducers will be connected to J9 of
the microboard.
The discharge transducers are optional on all units. If
the discharge transducers are not installed, no connec-
tions are made to the microboard and the discharge
pressure readout on the display would be zero.
The suction pressure transducers are standard on all
QTC3. The suction pressure transducers have a range
of 0 psig to 400 psig. The output will be linear from
0.5 VDC to 4.5 VDC over the 400 psig (27.5 barg)
range.
The discharge transducers have a range from 0 psig to
650 psig. The output will be linear from 0.5 VDC to
4.5 VDC over the 600 psig (41.25 barg) range. Follow-
ing is the formula that can be used to verify the volt-
age output of the transducer. All voltage reading are in
reference to ground (unit case).

Quantech QTC3040T Specifications

General

Brand	Quantech
Model	QTC3040T
Category	Chiller
Language	English