Quantech QTC4 STYLE A Series User Manual

QUANTECH
136
SECTION 8 - MICROPANEL
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
Eductor Differential
PROGRAM ◄DEF XXXXX LO XXXXX HI XXXXX
EDUCTOR DIFFERENTIAL = XXX °F
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 = 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 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.
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
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.
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.
TABLE 23 - PROGRAMMABLE OPERATING PARAMETERS
PROGRAM VALUE MODE LOW LIMIT HIGH LIMIT DEFAULT
Suction Pressure Cutout
Water
Cooling
24.0 PSIG 36.0 PSIG 24.0 PSIG
1.65 barg 2.48 barg 1.65 barg
Glycol
Cooling
5.0 PSIG 36.0 PSIG 24.0 PSIG
0.34 barg 2.48 barg 1.65 barg
Low Ambient Temp. Cutout -
-2.0°F 50.0°F 25.0°F
-18.9°C 10.0°C -3.9°C
Leaving Chilled Liquid Temp. 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 Temp 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

Quantech QTC4 STYLE A Series Specifications

General

Brand	Quantech
Model	QTC4 STYLE A Series
Category	Chiller
Language	English