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Table 23 - Programmable Operating Parameters - Quantech QTC4 STYLE A Series Installation Operation & Maintenance

Air-cooled screw liquid chillers with variable speed drive, 150 - 500 tons, 525 - 1750 kw, 2 compressor, 60 hz.
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SECTION 8 - MICROPANEL
Eductor Differential
PROGRAM
◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR DIFFERENTIAL
The eductor temperature differential is programmable
from 0°C to 10.0°C (0°F to 50.0°F). The default value
is 5.0°F. The programmed temperature assures the mi-
cro will sense a loss of educator oil flow, if the tem-
perature differential rises. A small differential of 2.8°C
(5.0°F) is recommended.
Eductor Safety Time
PROGRAM
◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR SAFETY TIME
The educator safety time allows programming the
time period the system is permitted to run if the safety
threshold is exceeded. The safety time is programma-
ble for 10 minutes to 1000 minutes with 10 minutes as
the default. A minimum safety time is recommended
to assure the compressor is not starved for oil for long
periods of time due to the educator circuit not siphon-
ing oil from the evaporator. A minimum time of 10
minutes is recommended as the program point.

TABLE 23 - PROGRAMMABLE OPERATING PARAMETERS

PROGRAM VALUE
Suction Pressure Cutout
Low Ambient Temp. Cutout
Leaving Chilled Liquid Temp. Cutout
Motor Current Limit
Pulldown Motor Current Limit
Pulldown Motor Current Limit Time
Condenser Subcooling Setpoint
Unit ID Number
Sound Limit Setpoint
Eductor Temp Differential
Eductor Safety Time
Motor Temperature Unload
136
Motor Temperature Unload
PROGRAM
= XXX °F
MOTOR TEMPERATURE UNLOAD
The motor temperature unload is programmable from
65.6°C (150.0°F) to 121.1°C 250.0°F. The default val-
ue is 115.5°C (240.0°F). The programmed temperature
assures the micro will sense a rise in motor temperature
due to a lack of compressor cooling. If the temperature
rises above the programmed threshold, the system will
unload the compressor by reducing speed. An unload
temperature of 115.5°C (240.0°F) is recommended to
assure the system does provides maximum capacity.
= XXXX MIN
Default Values
A listing of the low limits, high limits, and default val-
ues for each of the programmable values is noted in
each display and can be found in Table 23. Note that
the Imperial units are exact values while the Metric
units are only approximate.
MODE
Water
Cooling
Glycol
Cooling
-
Water
Cooling
Glycol
Cooling
-
-
-
-
-
Sound Limit
Option Enabled
-
-
-
◄DEF XXXXX LO XXXXX HI XXXXX
LOW LIMIT
HIGH LIMIT
24.0 PSIG
36.0 PSIG
1.65 barg
2.48 barg
5.0 PSIG
36.0 PSIG
0.34 barg
2.48 barg
-2.0°F
50.0°F
-18.9°C
10.0°C
-
-
-
-
11.0°F
36.0°F
-11.7°C
2.2°C
30% FLA
103% FLA
30% FLA
100% FLA
0 Min
255 Min
0.0°F
20.0°F
0.0°C
11.1°C
0
7
0%
100%
5.0°F
50.0°F
2.77°C
27.8°C
10 Min
1000 Min
150.0°F
250.0°F
65.6°C
121.1°C
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
= XXX °F
DEFAULT
24.0 PSIG
1.65 barg
24.0 PSIG
1.65 barg
25.0°F
-3.9°C
36.0°F
2.2°C
36.0°F
2.2°C
103% FLA
100% FLA
0 Min
5.0°F
2.8°C
0
0%
15.0°F
8.3°C
30 Min*
240.0°F
115.5°C
QUANTECH

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