Quantech QTC40160, Установка, эксплуатация и обслуживание

Страница: 139 / 188

Section 8 - Micropanel
Quantech
139
Form QTC4-NM2
Issue date: 05/12/2023
8
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 = XXXX MIN
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.
Motor temperature unload
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
MOTOR TEMPERATURE UNLOAD = XXX °F
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
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.
Table 28 - Programmable operating parameters
Program value Mode Low limit High limit Default
Suction pressure cutout
Water
cooling (R-134a)
26.1 psig 36.0 psig 26.1 psig
1.80 barg 2.48 barg 1.80 barg
Glycol
cooling (R-134a)
5.0 psig 36.0 psig 26.1 psig
0.34 barg 2.48 barg 1.80 barg
Suction pressure cutout
Water
cooling (R-513A)
30.2 psig 40.7 psig 30.2 psig
2.08 barg 2.80 barg 2.08 barg
Glycol
cooling (R-513A)
7.7 psig 40.7 psig 30.2 psig
0.53 barg 2.80 barg 2.08 barg
Low ambient air temperature cutout –
-10.0°F 50.0°F -2.0°F
-23.3°C 10°C -18.9°C
Leaving chilled liquid temperature cutout
Water
cooling
– – 36.0°F
– – 2.2°C
Glycol
cooling
11.0°F 36.0°F 36.0°F
-11.7°C 2.2°C 2.2°C
Motor current limit – 30% FLA 103% FLA 103% FLA
Pulldown motor current limit – 30% FLA 100% FLA 100% FLA
Pulldown motor current limit time – 0 min 255 min 0 min
Condenser subcooling setpoint –
0.0°F 20.0°F 5.0°F
0.0°C 11.1°C 2.8°C
Unit ID number – 0 7 0
Sound limit setpoint
Sound limit
option enabled
0% 100% 0%
Eductor temperature differential –
5.0°F 50.0°F 15.0°F
2.77°C 27.8°C 8.3°C
Eductor safety time – 10 min 1000 min 30 min*
Motor temperature unload –
150.0°F 250.0°F 240.0°F
65.6°C 121.1°C 115.5°C