Environmental Technologies Air Terminal Unit SDR-10

Check the following conditions before cleaning

Disconnect all electrical power to the equipment, tag and lock out power source.

Gain access to coil either through ductwork or optional coil access panel.

Use soft brush and vacuum to remove loose debris from sides of coil.

Were any coil fins damaged during cleaning?

Straighten any coil fins that may have been damaged during cleaning process with fin comb.

Replace ductwork or access panel and restore electrical power to equipment.

Refer to the 'Electric Heat, All Products' IOM for complete electric heater installation, operation and maintenance information.

Check the primary auto-reset limit switch for proper operation.

Inspect the secondary one-time trip limit switch for tripping.

Replace the secondary limit switch if it has tripped, ensuring the new switch has the same trip temperature as the original.

Check if an optional manual reset secondary is installed and reset if necessary by depressing the reset switch.

Verify airflow is at least 70 CFM per kW.

Ensure a minimum of 0.1" w.g. external pressure is maintained.

Verify electrical work completion and termination

Verify electrical connections and voltage

Enter the AC power imbalance percentage

Is the AC power within 10% of rated voltage at rated frequency?

Is the AC power within 5% of rated frequency at rated voltage?

Is the combined variation in voltage and frequency within 10% of rated values?

Ensure minimum downstream static pressure for equipment with electric heat

Obtain and understand the project control sequence/wiring diagram

Mechanical Angle of Rotation Stops

Loosen the two end stop screws using a No. 2 Phillips head screwdriver

Ensure not to unscrew the captive nut under the slot

Move the stops to the desired position (in 2.5° steps)

Disconnect actuator from the controller

Apply 24 VAC to the COM and CW terminals on the actuator

Verify actuator rotates in a clockwise direction

Apply 24 VAC to the COM and CCW terminals on the actuator

Verify actuator rotates in a counter clockwise direction

Confirm actuator moves in both directions

If actuator does not rotate, check if it is at an end stop or there is a problem with the damper

Loosen the set screw to free the actuator from the damper shaft