Daikin Rebel Applied DPSA Installation And Start-Up Manual page 77

Table 15: Troubleshooting-Main Electric Heat or ERW Electric heat
Problem Cause
Main power OFF
Fan not activated
Manual thermal cutout tripped
No Heat
Automatic thermal cutout tripped
Fuses blown
Heating element burned out
Low line voltage
Cycling on automatic thermal cutout
Low Output
Fuses blown
Control system
Not enough airflow
Overheating
Uneven or partially blocked airflow
High line voltage
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Remedy
Turn main power disconnect switch on
Check to see if fan unit is on and if auxiliary contact on fan motor starter is closed.
Check all field wiring for continuity or possible short circuits.
Check wiring diagram on inside of cover of heater or panelboards for interlocks and
remote control equipment to make sure it is all working
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check for burned out elements by disconnecting power wiring to the elements and
connecting a reliable ohmmeter to the element terminals
Element resistance (R) should be: R = E2/(1.06xW) ± 5%
Where E = voltage across element; W = Number of kW x 1000/Number of elements
Check nameplate voltage is equal to line voltage
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check to see if fan is ON
Check all field wiring for continuity or possible short circuits
Check wiring diagram to make sure interlocks and remote control equipment are working
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check for obstructions to airflow through the heater. (Outdoor Air Damper Open, Mist
Eliminators Clean, Filters Clean, etc)
Check that heater has at least the minimum amount of airflow
Check all manual thermal cutout(s) reset button(s) - reset as required
Check all fuses - replace as required
Check nameplate voltage is equal to line voltage
77
Unit Maintenance
IM 1287 • REBEL APPLIED ROOFTOP