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Electronic Controls
64
Screen #3
For accuracy, the Microprocessor Controller must
be adjusted to match the unit sensors. That
adjustment is done with Screen #3.
There are two types of sensors, graded and
ungraded.
Graded sensors are measured and presorted at the
factory into categories (grades) based on their
electrical resistance. They are marked with grades
1 through 5. Graded sensors, regardless of grade
number, are accurate to within ±.125 degrees.
Ungraded sensors are not sorted and therefore
have a wider possible range of resistance. They do
not have grading marks and are accurate to ±.6
degrees.
The TG-V Microprocessor Controller can be
calibrated to work with either type of sensor.
For graded sensors, set the controller to match the
grade of the sensor. Example: for a grade 4 sensor,
the controller setting would be 4.
For ungraded sensors, set the controller to grade 0.
Directions for choosing the set-up codes for
Screen #3 are on the next page.
Discharge Sensor Grade (Optional)
Matches controller operation to the grade of the
discharge air sensor.
Settings:
Grades 0, 1, 2, 3, 4, or 5.
Return Sensor Grade
Matches controller operation to the grade of the
return air sensor.
Settings:
Grades 0, 1, 2, 3, 4, or 5.
NOTE: An ungraded sensor can be partially
graded by immersing the sensor in a good ice
bath and then selecting various sensor grades
until the return air (or discharge air)
temperature reads 32.0 F (or 0.0 C). The sensor
may then be accurate for freezing temperature
but may not be accurate towards either extreme
of the controller range.
NOTE: When return air and discharge air
sensors are used with a modulation control
valve, graded sensors must be used. Without
modulation, the use of graded sensors is
optional.
NOTE: The return air sensor is the primary
control sensor and must be connected at all
times.
Summary of Contents for 914970
Page 3: ...3...
Page 10: ...Table of Contents 10...
Page 40: ...Operating Instructions 40...
Page 82: ...Electronic Controls 82...
Page 92: ...Electrical Maintenance 92...
Page 124: ...Refrigeration Maintenance 124...
Page 140: ...Hilliard Clutch Maintenance 140...
Page 160: ...Refrigeration Diagrams 160...
Page 163: ...Index 163 W wiring 85 wiring diagrams 165...
Page 164: ...Index 164...
Page 166: ...Wiring and Schematic Diagrams Index 166...
Page 167: ...167 Cab Control RD Wiring Diagram...
Page 168: ...168 RD w o Thermostat Cab Control Schematic...
Page 169: ...169 RD Cab Box Wiring Diagram...
Page 170: ...170 RD Cab Control w Thermostat Schematic Diagram...
Page 171: ...171 RD 50 STD 3 Phase Wiring Diagram Page 1 of 2...
Page 172: ...172 RD 50 STD 3 Phase Wiring Diagram Page 2 of 2...
Page 173: ...173 RD 50 STD 3 Phase Schematic Diagram Page 1 of 2...
Page 174: ...174 RD 50 STD 3 Phase Schematic Diagram Page 2 of 2...
Page 175: ...175 RD 30 STD Wiring Diagram Page 1 of 2...
Page 176: ...176 RD 30 STD Wiring Diagram Page 2 of 2...
Page 177: ...177 RD 30 STD Schematic Diagram Page 1 of 2...
Page 178: ...178 RD 30 STD Schematic Diagram Page 2 of 2...
Page 179: ...179 RD 30 C S Wiring Diagram Page 1 of 2...
Page 180: ...180 RD 30 C S Wiring Diagram Page 2 of 2...
Page 181: ...181 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 182: ...182 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 183: ...183 RD 50 C S 3 Phase Wiring Diagram Page 1 of 2...
Page 184: ...184 RD 50 C S 3 Phase Wiring Diagram Page 2 of 2...
Page 185: ...185 RD w CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 186: ...186 RD w CYCLE SENTRY Schematic Diagram Page 2 of 2...