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Unit Maintenance
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IM 1287-4 • REBEL APPLIED ROOFTOP
Table 17: Troubleshooting-Main Electric Heat or ERW Electric heat
Problem
Cause
Remedy
No Heat
Main power OFF
Turn main power disconnect switch on
Fan not activated
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
Manual thermal cutout tripped
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
Automatic thermal cutout tripped
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
Fuses blown
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
Low Output
Heating element burned out
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
Low line voltage
Check nameplate voltage is equal to line voltage
Cycling on automatic thermal cutout
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
Fuses blown
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
Overheating
Control system
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
Not enough airflow
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
Uneven or partially blocked airflow
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
High line voltage
Check nameplate voltage is equal to line voltage
Содержание Rebel Applied DPSA
Страница 15: ...Introduction www DaikinApplied com 15 IM 1287 4 REBEL APPLIED ROOFTOP Figure 17 VFD Inverter Box Components ...
Страница 109: ...Unit Maintenance www DaikinApplied com 109 IM 1287 4 REBEL APPLIED ROOFTOP Figure 159 10kW 50kW Full SCR Control ...
Страница 144: ...IM 1287 4 REBEL APPLIED ROOFTOP 144 www DaikinApplied com Furnace Wiring Diagrams Figure 178 600 MBH 2 Stage ...
Страница 145: ...Furnace Wiring Diagrams www DaikinApplied com 145 IM 1287 4 REBEL APPLIED ROOFTOP Figure 179 600 MBH 4 Stage ...
Страница 147: ...Figure 181 600 MBH 5 1 Modulation 400 MBH and 600 MBH 10 1 Modulation ...
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