Troubleshooting

7.0TROUBLESHOOTING

Use this section to assist in troubleshooting your unit. Also refer to 5.0 - Alarm Descriptions. Sug- gestions are grouped by product function for convenience.

! WARNING

Only qualified personnel should perform service on these units. Lethal voltage is present in some circuits. Use caution when troubleshooting with power on. Disconnect and lock out power before replacing components. Use caution and standard procedures when working with pressurized pipes and tubes.

! CAUTION

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

Table 21 Blower troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Blower will not start

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.

 

 

 

 

 

Overloads tripped

Push reset button on main fan overload. Check amp

 

 

draw.

 

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 22 Chilled water troubleshooting

Symptom

Possible Cause

Check or Remedy

 

 

 

Chilled water or hot

Motor operates but valve won’t open

Check linkage for adjustment and be sure that it is

water/steam valve

 

tight on the valve.

not opening

 

 

 

No 24 VAC power to motor

Check linkage for adjustment and be sure that it is

Modulating Motors

 

tight on the valve.

 

No signal from control

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 2.0 VDC or above as

 

 

temperature control is varied below room temperature

 

 

on cooling valve or above room temperature on

 

 

heating valve.

 

Motor not working

Remove wires on terminal No. 1 and No. 3 from the

 

 

motor (do not 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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Liebert 3000 manual Blower troubleshooting, Chilled water troubleshooting, Symptom Possible Cause Check or Remedy

3000 specifications

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