Troubleshooting

8.0TROUBLESHOOTING

Use this section to assist in troubleshooting your unit. Also refer to 6.0 - Alarm Descriptions. Sug- gestions are grouped by product function for convenience.

! WARNING

Risk of electric shock. Can cause injury or death.

The Liebert iCOM microprocessor does not isolate power from the unit, even in the “Unit Off” mode. Some internal components require and receive power even during the “Unit Off” mode of Liebert iCOM control.

The only way to ensure that there is NO voltage inside the unit is to install and open a remote disconnect switch. Refer to unit electrical schematic.

Only properly trained and qualified personnel should service these units. Lethal voltage is present in some circuits. Use caution when troubleshooting with power On. Disconnect and lock out power before replacing components.

! WARNING

Risk of explosive discharge from high-pressure refrigerant. Can cause injury or death.

This unit contains fluids and gases under high pressure. Relieve pressure before working with piping.

NOTICE

Risk of improper control connection. Can cause equipment damage.

When using jumpers for troubleshooting, always remove jumpers when maintenance is complete. Jumpers left connected could override controls and cause equipment damage.

Table 12 Blower troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

 

No main power

Check L1, L2 and L3 for rated voltage.

 

 

 

 

Blown fuse or tripped circuit breaker (CB)

Check fuses or CBs to main fan.

 

 

 

Blower will not

Overloads tripped

Push reset button on main fan overload. Check amp draw.

 

 

start

No output voltage from transformer

Check for 24 VAC between P24-2 and P24-1. If no

 

voltage, check primary voltage.

 

 

 

Control fuse blown or circuit breaker tripped

Check for 24 VAC between P4-4 and E1. If no voltage,

 

check for short. Replace fuse or reset circuit breaker.

 

 

Table 13 Chilled water troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Chilled water or hot

Motor operates but valve

 

water/steam valve

Check linkage for adjustment and be sure that it is tight on the valve.

won’t open

not opening

 

 

 

 

 

 

 

No 24 VAC power to motor

Check linkage for adjustment and be sure that it is tight on the valve.

 

 

 

 

 

Check DC voltage on printed circuit board in motor. Terminal No. 1 is

 

 

grounded and No. 3 is positive. DC voltage should vary from 0.8 to

 

No signal from control

2.0 VDC or above as temperature control is varied below room

Modulating Motors

 

temperature on cooling valve or above room temperature on heating

 

valve.

 

 

 

 

Remove wires on Terminal No. 1 and No. 3 from the motor (do not

 

Motor not working

short). With 24 VAC power from TR to TR jumper terminal 1 and 2 on

 

motor to drive open. Remove jumper to drive closed, if motor fails to

 

 

 

 

work, replace it.

 

 

 

Actuator Motors

No 24 VAC power to motor

Check for 24 VAC between P22-3 and P22-5 (open), or P22-1 and

P22-5 (closed).

 

 

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Emerson 3000/ITR manual Troubleshooting, Blower troubleshooting, Chilled water troubleshooting

3000/ITR specifications

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