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Table 18 —
Operating Issues and Concerns
Fig. 77 —
Typical Economi$er
®
X Wiring Diagram
ISSUE OR CONCERN
POSSIBLE CAUSE AND REMEDY
My outdoor temperature reading on
the STATUS menu is not accurate.
Check the sensor wiring:
• Enthalpy sensors are to be wired to the S-Bus terminals.
• Temperature sensors are to be wired to the OAT and MAT terminals.
See Fig. 77.
If my enthalpy sensor drifts in accu-
racy over time, can I re-calibrate it?
Sensors cannot be re-calibrated in the field. However, the ADVANCED menu includes an item where you
can input a limited offset in temperature and humidity for each sensor connected to the economizer.
Can I go back to factory defaults and
start over?
Under the SYSTEM SETUP menu you can change the setpoints to the factory defaults.
Will I be able to see the LCD screen
when it is in the unit?
The LCD screen has a backlight that is always illuminated.
What is a good setpoint for the Sup-
ply Air Temperature (SAT)?
The supply air temperature is the temperature of air that you want to supply to the space. In a commercial
building, this is 50°F to 55°F (10°C to 13°C). The supply air is the mixing of the return air and the outdoor
air.
I am using enthalpy sensors. Why did
the control ask me to input a dry bulb
changeover temperature?
If the humidity sensor in the enthalpy sensors fails, the backup algorithm in the control is to default to the
temperature sensor in the enthalpy sensor.
In checkout, the outdoor damper
closes when I command it to open.
Check the actuator linkage or rotation. In the CHECKOUT mode, the outdoor damper should drive open or
closed with the return air damper having the opposite effect.
How do I set the minimum position?
The minimum position is set using the VENTMIN and VENTMAX setup in the SETPOINTS menu. VENT-
MIN is the minimum ventilation required when using an occupancy sensor and VENTMAX is the minimum
ventilation when not using an occupancy sensor for Demand Controlled Ventilation. The VENTMAX position
is set the same as with the potentiometer on the analog economizers, and is the output voltage to the
damper actuator. The range is 2 Vdc closed OA damper and 10 Vdc open OA damper.
What if my damper does not go
completely closed in the checkout
operation?
Check the damper linkage or hub to make sure the damper is able to close completely.
How do I set the OCC?
There are two settings for OCC, INPUT and ALWAYS. INPUT is from the space thermostat, if it has an
occupancy output. ALWAYS is the unit in the occupied mode, if the economizer is powered (fan on).
Does the economizer save my pro-
gram values if the unit loses power?
Yes, once the changes are stored in the controller they will be stored until they are changed by the operator.
If the unit is left in checkout, how
long will the unit stay in checkout
mode without input?
The unit will remain in checkout for 10 minutes, then return to normal operation.
Summary of Contents for WeatherExpert 50LC14
Page 4: ...4 Fig 2 50LC Vertical Airflow Size 14...
Page 5: ...5 Fig 3 50LC Horizontal Airflow Size 14...
Page 6: ...6 Fig 4 50LC Back View and Condensate Drain Location Size 14...
Page 7: ...7 Fig 5 50LC Corner Weights and Clearances Size 14...
Page 8: ...8 Fig 6 50LC Bottom View Size 14...
Page 9: ...9 Fig 7 50LC Vertical Airflow Sizes 17 20...
Page 10: ...10 Fig 8 50LC Horizontal Airflow Sizes 17 20...
Page 11: ...11 Fig 9 50LC Back View and Condensate Drain Location Sizes 17 20...
Page 12: ...12 Fig 10 50LC Corner Weights and Clearances Sizes 17 20...
Page 13: ...13 Fig 11 50LC Bottom View Sizes 17 20...
Page 14: ...14 Fig 12 50LC Vertical Airflow Sizes 24 26...
Page 15: ...15 Fig 13 50LC Horizontal Airflow Sizes 24 26...
Page 16: ...16 Fig 14 50LC Back View and Condensate Drain Location Sizes 24 26...
Page 17: ...17 Fig 15 50LC Corner Weights and Clearances Sizes 24 26...
Page 18: ...18 Fig 16 50LC Bottom View Sizes 24 26...
Page 21: ...21 Fig 19 Roof Curb Details 14 Size Unit...
Page 22: ...22 Fig 20 Roof Curb Details 17 and 20 Size Units...
Page 23: ...23 Fig 21 Roof Curb Details 24 and 26 Size Units...
Page 30: ...30 Fig 42 50LC 14 26 Electro Mechanical Control Wiring Diagram...
Page 31: ...31 Fig 43 50LC 14 26 RTU Open Control Wiring Diagram...
Page 32: ...32 Fig 44 50LC 14 26 SystemVu Control Wiring Diagram...
Page 35: ...35 Fig 47 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 208 230V Shown...
Page 36: ...36 Fig 48 Typical Power Wiring Diagram SystemVu Controls 50LC Unit 460V 575V Shown...
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