Troubleshooting Guide

ManualsBrandsEMAX ManualsAir Compressor PartsPremium Series 58 CFM Refrigerated Electric Air Dryer

3UREOHP

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3RVVLEOH&DXVH

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5HSDLU

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&RPPHQWV

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Dryer is

switched on,

indicator light

is lit but the

refrigerant

compressor

does not turn on.

The connection has

inverted phases

Invert two phases

3-phase dryers are equipped with a phase

controller

to avoid the fans from turning in the

opposite

direction.

Refrigeration unit is not functioning

Check refrigeration

compressor

Several factors can cause compressor failure.

A qualified refrigeration technician needs to

check

all the electrical and refrigerant circuit and

controls.

The refrigerant high pressure protection

has tripped

The refrigerant safety high

pressure switch has tripped.

The dryer is protected against excessively high

refrigerant pressure. If the condenser efficiency has

reduced, the switch will trip. Manually reset the

switch.

In case of water cooled con-

densers, check the water

control valve

Excessive ambient temperature

Be sure that dryer is working

in temperatures lower than the

design conditions.

Designed conditions and

correction factors are described

in this manual.

A high ambient temperature may cause

the

refrigerant system to operate at higher than

normal

pressures. Results will be higher than

normal

evaporator temperature.

lmportant: adequate air circulation around the

dryer,

and proper ventilation in the equipment room

should

guarantee a low enough ambient

temperature.

Dryer is

switched on,

but the refrigerant

compressor

does not turn on.

Excessive temperature on

crankcase of compressor.

Allow time to compressor to

cool down. Reason may be a

possible incorrect adjustment

of hot gas bypass valve or

shortage of refrigerant

Compressor is protected against overly high

temperatures of the crankcase by a thermal switch.

Excessive compressed

air inlet temperature.

Be sure that dryer is working

in temperatures lower than

design conditions.

The dryer is designed for working in calculated

conditions (see description in this

manual).

If conditions are exceeded, the dryer will be

overflowed, dew point will go up and protecting

devices can switch off.

Clogged condenser fins or clogged

water condenser.

Possible high crankcase temperature

Possible loss of phase

Possible low voltage causing overload

trip Possible failed compressor

Clear fins or water condenser

of all obstructions.

The clogged fins in the condenser will restrict the

air passage and reduce the refrigeration capacity,

causing high temperature in the evaporator.

Same will occur if water condenser is clogged with

mud or dirt. Air condenser and water condenser

should be periodically checked and cleaned.

Protect water circuit by an adapted filter.

Too much compressed air flow.

Check actual flow

through the dryer.

This dryer is designed for a maximum air flow at

design conditions. If too much air is

pumped

into the dryer, water removal capacity may not

sufficient, resulting in liquid carryover down

stream.

Check the rated output the air

compressor.

Faulty electrical wiring

Inspect the circuit

The compressor-on light should be wired into the

refrigerant compressor circuit. See wiring

diagrams

in this manual.

One electrical protection

has tripped.

Reset the protection or

replace the blown fuse.

The dryer is protected against high amp draw

fuse and/or overload relay that can trip in case

need. Reset or replace fuse once, but do not

persist

if it trips again, request assistance from a

qualified

refrigeration contractor.

Dryer is switched

on but fan is not

running.

Fan has to run if refrigerant high

pressure reaches upper set point.

Check that compressed air

flows through the dryer. Check

that fan blades are free to

move.

Check the fan pressure switch.

Fan operates automatically to keep

refrigerant

pressure below the maximum value. The fan can

stop if pressure is under the recommended setting.

When compressor

starts, it vibrates

a lot and makes

mechanical noise.

Compressor is slugging liquid

refrigerant

at start up.

Be sure the pre-heating period

of at least 2 hours is

respected

Refrigerant may move between receivers when

refrigerant compressor is stopped and not

heated,

especially if stopped for a long time.

This migration may cause liquid shock (slugging) in

valves specially on large dryers containing more

refrigerant

7528%/(6+227,1*

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Summary of content (3 pages)

PAGE 1
7528%/(6+227,1* 3UREOHP 3RVVLEOH &DXVH 5HSDLU Dryer is switched on, indicator light is lit but the refrigerant compressor does not turn on. The connection has inverted phases Invert two phases Refrigeration unit is not functioning Check refrigeration compressor The refrigerant high pressure protection has tripped The refrigerant safety high pressure switch has tripped. &RPPHQWV 3-phase dryers are equipped with a phase controller to avoid the fans from turning in the opposite direction.
PAGE 2
3UREOHP 3RVVLEOH &DXVH 5HSDLU Water in system Compressed Air Inlet and outlet connections are reversed. Check inlet and outlet connections. Drain system is clogged or inoperative. Restore a free flow of water condensate. Check water evacuation. Bypass system is open Check the valves Important: Bypass piping should be installed around the dryer so the dryer can be isolated for service without shutting down the air supply.
PAGE 3
UREOHP 3RVVLEOH &DXVH 5HSDLU &RPPHQWV The unit will not run or cycles off and on. Excessive ambient temperature Designed conditions and correction factors are described in dryer . Be sure that dryer is working lower than design conditions. A high ambient temperature may cause the refrigerant system to operate at higher than normal pressures. Results will be a higher than normal evaporator temperature.