Nortec NH Series - Manual (Page 72)

10-40
Page 65
2008-08-28
Probable Cause Corrective Action
1. The high limit is too close to the distributor.
2. Is there loose wiring?
3. Are there defective controls?
4. Is the safety high limit set point is too low? 1. Relocate high limit 10 feet from the steam
distributor.
2. Check all wires at the safety controls.
3. Replace any defective device.
4. Change high limit set point to 85% or more.
1. The high limit is too close to the distributor.
2. Is the controller defective?
3. Are the P and I settings incorrect? 1. Relocate high limit 10 feet from the steam
distributor.
2. Replace the controller.
3. Adjust the P and I constants.
1. The high limit is located too close to the distributor.
2. Is the controller defective?
3. Are the P and I settings incorrect?
4. Safety high limit set point is set too low. 1. Relocate high limit 10 feet from the steam
distributor.
2. Replace the controller.
3. Adjust the P and I constants.
4. Change high limit set point to 85% or more.
--- Contact the system administrator to override the remote
command.
--- To disable this feature, consult the programming manual
shipped with the humidifier.
1. Is the humidifier oversized?
2. Check the sensor location.
3. Are the P and I settings incorrect? 1. Reduce manual capacity setting by 50%.
2. The sensor should be located away from doors and
drafts.
3. Adjust the P and I constants.
1. Is the humidifier oversized?
2. Is the high limit located too close to the distributor?
3. Are the safety controls damaged? 1. Reduce manual capacity setting by 50%.
2. Relocate the high limit to 10 feet from the steam
distributor.
3. Replace any damaged controls.
1. Is the humidifier still operating?
2. Is the humidifier oversized? 1. Verify that the RH setpoint is less than the RH high limit
setting.
2. Reduce the manual capacity setting by 50%.
1. Is the humidifier still operational?
2. Is the humidifier oversized? 1. Verify that the RH setpoint is greater than the RH low
limit setting.
2. Set the manual capacity setting to 100%.
3. Add more humidifiers.
--- Verify that the replacement cylinder is the same as the old
cylinder.
1. Loose wire.
2. Electronics damaged.
3. Electromagnetic Interference. 1. Verify cables.
2. Replace electronics or contact factory.