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Form QTC4-NM2
Issue date: 05/12/2023
The programmed temperature ensures the micro will
sense a loss of educator oil flow, if the temperature dif-
ferential 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 pro-
grammable for 10 min to 1,000 min with 10 min as
the default. A minimum safety time is recommended
to ensure the compressor is not starved for oil for
long periods of time due to the educator circuit not
siphoning oil from the evaporator. A minimum time of
10 min is recommended as the program point.
Table 28 - Programmable operating parameters
Program value
Suction pressure cutout
Suction pressure cutout
Low ambient air temperature cutout
Leaving chilled liquid temperature cutout
Motor current limit
Pulldown motor current limit
Pulldown motor current limit time
Condenser subcooling setpoint
Unit ID number
Sound limit setpoint
Eductor temperature differential
Eductor safety time
Motor temperature unload
Quantech
Motor temperature unload
PROGRAM
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
ensures the micro will sense a rise in motor temperature
= XXXX MIN
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
ensure the system does provides maximum capacity.
Default values
A listing of the low limits, high limits, and default
values for each of the programmable values is noted
in each display and can be found in Table 28 on page
139. Note that the Imperial units are exact values
while the Metric units are only approximate.
Mode
Low limit
26.1 psig
Water
cooling (R-134a)
1.80 barg
5.0 psig
Glycol
cooling (R-134a)
0.34 barg
30.2 psig
Water
cooling (R-513A)
2.08 barg
7.7 psig
Glycol
cooling (R-513A)
0.53 barg
-10.0°F
–
-23.3°C
Water
cooling
11.0°F
Glycol
cooling
-11.7°C
–
30% FLA
–
30% FLA
–
0 min
0.0°F
–
0.0°C
–
0
Sound limit
0%
option enabled
5.0°F
–
2.77°C
–
10 min
150.0°F
–
65.6°C
Section 8 - Micropanel
◄DEF XXXXX LO XXXXX HI XXXXX
High limit
36.0 psig
2.48 barg
36.0 psig
2.48 barg
40.7 psig
2.80 barg
40.7 psig
2.80 barg
50.0°F
10°C
–
–
–
–
36.0°F
2.2°C
103% FLA
100% FLA
255 min
20.0°F
11.1°C
7
100%
50.0°F
27.8°C
1000 min
250.0°F
121.1°C
= XXX °F
8
Default
26.1 psig
1.80 barg
26.1 psig
1.80 barg
30.2 psig
2.08 barg
30.2 psig
2.08 barg
-2.0°F
-18.9°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
139
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