Tools Required:

Drill with 1/8" and a 1/4" diameter drill bits,

Wire cutter,

Phillips screw driver,

Thermometer or temperature meter,

Amp meter.

Parts Provided with Glass Sentry:

Five #6x1/2" self-tapping screws

A #1 straight-blade screw driver for the sensorscrew terminals

Six adhesive-backed wire clips

 

1. Before removing power to the glass door heater circuit, take temperature readings around the door frame to determine the coldest spot on the frame while the heater circuit has been running. Make sure that this spot is marked for future sensor placement.

 

2. Remove power to the heater circuit and mount Glass Sentry in a convenient location on the top of the walk-in freezer using three #6x1/2" self-tapping screws (provided with the unit). Refer to Figure 2.

 

3. Following the wiring diagram below, connect Glass Sentry so that white wire is tapped into the Neutral junction of the breaker panel and heater. The black wire should connect to the line power from the breaker panel, and then the red wire connects to the line side of the heater circuit. Make sure all connections are firm and secure.

 

4. Locate a spot on the top center of the door frame to mount the Glass Sentry’s humidity sensor.Clean the surface of the frame where the sensor is to be mounted, peel the paper from the back of the sensor, and stick to the frame. Refer to Figure 2.

 

5. Run the humidity sensor cable back to the unit and connect the four wires (Red, Yellow, Black, and Green) correspondingly to the screw terminals labeled "G Y B R" on Glass Sentry. Drilling a 1/4" diameter hole in the drywall or inside frame may be required to run the sensor cables back to the unit.

 

6. Mount one of Glass Sentry's temperature sensors on the cold spot on the frame identified in the first step of the installation by drilling an 1/8" diameter hole in the frame and securing it with one #6x1/2" self-tapping screw (provided with the unit). Refer to Figure 2.

 

7. Run the sensor wire back to the screw terminals labeled "T1" on Glass Sentry.

 

8. After the heater circuit has been off for at least 15 minutes, take the same temperature readings around the door frame as in the first step and mark this spot for the second sensor location. If this spot is the same as the location identified in Step 1, locate the next coldest spot on the frame and mark its location.

 

9. Mount the second temperature sensor on this location by drilling another 1/8" diameter hole in the frame and securing it with one #6x1/2" self-tapping screw (provided with the unit). Refer to Figure 2.

 

10. Run the sensor wire back to the screw terminals labeled "T2" on Glass Sentry. Use necessary wire clips to secure all of the sensor wires around the door frame.






Apply power to the circuit and insure that the Heater LED on Glass Sentry is lit and the heater circuit is running. You may need an amp meter to measure the current going to the heater circuit to determine whether or not the heater is running. Follow the steps below if the LED is not lit or the heater circuit is not running, or if the heater circuit never shuts off.

 

Troubleshooting

 

If the Heater LED is not lit and the heater circuit does not energize:

Check the voltage to ensure that it is between 95 and 128 VAC. If there is no AC voltage present, check the fuse or circuit breaker feeding the heater circuit. In the event that the fuse or breaker is blown, re-check your wiring and insure that the heater circuit does not exceed 30 amps. Make sure that the temperature sensors have been properly placed on the door frame. Replace the Glass Sentry if no other issues are found.

If the Heater LED is lit but the heater circuit is not running:


Check the wiring to make sure that it is correct and that all connections are tight and secure.

If the Heater LED and the heater circuit never turns off:

Check the wiring to make sure that it is correct and insure that the heater circuit is not drawing more than 30 amps. Make sure that all of the sensors have been properly placed on the door frame. Replace the Glass Sentry if no other issues have been found.

If the Heater LED is off but the heater circuit is still running:

Check the wiring to make sure that it is correct and ensure that the heater circuit is not drawing more than 30 amps. If the humidity is above 70%, the heater circuit may not shut off until the humidity level drops.Replace the Glass Sentry if no other issues have been found.

If the heater circuit is not running enough and condensation begins to form on the glass:

Rotate the adjustment on the side of Glass Sentry clockwise, in small increments, until the issue is resolved. Refer to Figure 1.

 

Technical Support

For additional questions and support you may either direct your email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it , or you may call(605) 394-0140 .