Emax PDRCF1150115, PDRCF4600575, PDRCF1150058, PDRCF1150144, PDRCF4600288 Instruction Manual
...
Emax Air Dryer
R E F R I G E R A T E D T Y P E C O M P R E S S E D A I R D R Y E R S
EDRCF1150029 – EDRCF4602000
Instructions Manual
TABLE OF CONTENTS
1. Important safety notes - Please read .......................... 1
1.1. Transportation ............................................................... 1
1.2 Positioning ..................................................................... 1
1.3 Installation ...................................................................... 1
1.4 Before operating ............................................................ 1
1.5 Maintenance by an engineer ......................................... 1
1.6 Maintenance by the user ............................................. 1
2. Introduction ..................................................................... 2
3. Operation ......................................................................... 4
4. Technical specifications ................................................ 7
5. Diagrams ............................................................................. 8
6. General Arrangements ................................................... 18
7. Main Settings ................................................................ 18
8. Drawings ........................................................................ 19
9. Components location ................................................... 60
10. Troubleshooting ............................................................ 61
11. Warranty ......................................................................... 63
1
A)
When operating the air dryer the operator must apply safe working methods and observe all local safety
instructions and relevant regulations.
B)
Prior to installation, the dryer and the compressed air system are to be depressurized and disconnected
from the electrical main supply.
C)
The user is responsible for safe operating conditions. Parts and accessories must be replaced if inspection
shows that safe operation cannot be assured.
D)
Installation, operation, maintenance and repair are only to be authorized, trained and skilled engineers.
E)
The minimum and maximum values stated must be observed, as well as all of the safety precautions described
in this manual.
F)
If any statement in this manual does not comply with the local legislation, the strongest standard is to be applied.
1.1. Transportation
A)
Use care and caution when transporting the dryer. Avoid dropping and other physical abuse.
B)
A forklift can be used to transport the dryers provided the forks are long enough to support its full width or
length and caution is used throughout the move.
1.2. Positioning
A)
The dryer must be installed horizontally. A minimum of 20” clearance around the dryer is necessary to
allow a good ventilation and easy access for servicing.
B)
The ambient temperature in the room should not exceed 122°F and should not be below 39°F, taking the heat
radiated by the dryer into account.
C)
(40 watt for each liter/sec under ISO 7183-A condition or 18 watts for each SCFM under ISO 7183-B condition).
1.3. Installation
A)
In addition to the general mechanical construction procedures and local regulations, the following instructions
need to be emphasized:
1) Only authorized, trained and skilled engineers should install the compressed air dryer.
2) Safety devices, protecting covers or insulation in the dryers never to be dismantled or modified.
Each pressure vessel or accessory installed outside the dryer with air above atmospheric pressure must be fitted
with the required pressure relief safety valves.
1.4. Before Operating
A)
Review all safety precautions.
B)
The piping must have the correct diameter and be adapted to the operating pressure (see technical specification).
C)
Never operate the dryer at pressure above the maximum specified on the dryer label (check the technical specs too).
1.5. Maintenance by an Engineer
A)
Maintenance and repairs should only be performed when the air dryer is shut down and depressurized and when
the main power switch is turned off.
B)
Use only the appropriate tools for maintenance and repair.
C)
Before dismantling a part under pressure, disconnect the pressure sources and depressurize the system.
D)
Proceed carefully during maintenance and repair. Prevent dirt from entering by covering parts and orifices with
a clean cloth, paper or tape. A receiver should never be welded or modified in any way.
E)
Never leave tools, loose parts or cleaning rags in or on the air dryer.
F)
Before returning the dryer into service, check the setting of the control and safety devices as well as the pressure
and the temperature of the compressed air circuit.
1.6. Maintenance by the user
A)
Keep the dryer clean.
B)
Regularly check the correct operation of the condensate drain trap.
C)
Every six months, check and clean the drain strainer by undoing the access screw and rinsing the filter with tap
water to remove the trapped dirt from the inside.
I. IMPORTANT SAFETY NOTES – Please READ
2
D)
For air cooled dryers, clean the air condenser as soon as it’s dirty or clogged.
E)
For optional water-cooled condensers, use only clean water and install a water filter if needed.
Use water counter flow to clean condenser if need.
F)
Check the trouble-shooting list in case of maintenance troubles.
G)
Check operating pressures, temperatures and time settings after maintenance. If operating and safety devices
function properly, the air dryer may be used.
A) Manufacturer:
B) Purpose of this dryer
1)
This refrigerated compressed air dryer has been designed to remove water vapor from industrial compressed air.
2)
This dryer has been designed for indoor operation.
3)
The minimum and maximum values stated must be observed, as well as the safety precautions described
in this manual.
C) Dryer label
The following label is affixed on the cabinet
of the refrigerant compressed air dryer.
D) Working details
1)
Refrigerant circuit:
The refrigerant circuit can be divided in 3 parts:
a)
Low pressure section with an evaporator (heat exchanger)
b)
High-pressure section including: Condenser, liquid receiver, (if installed) and the filter dryer.
c)
Control circuit including: Compressor, Expansion valve, by-pass valve (if installed),
Fan pressure switch (if installed)
2)
For water - cooled dryers:
a)
Water valve
b)
Safety high pressure switch (if installed)
3)
The Refrigerant circuit operates as follows:
a)
The compressor compresses gaseous refrigerant to a high temperature.
b)
The hot refrigerant condenses in the condenser. Being liquefied it is stored in the liquid receiver (if installed).
c)
The liquid is taken out the storage vessel and injected in the evaporator (heat exchanger) by an expansion valve.
This expansion valve is protected by a filter, which removes particles and humidity that could be in the circuit.
d)
The injected liquid fills in the refrigerant section of the air / refrigerant heat exchanger and evaporates by taking
out the calories from the compressed air. The gaseous refrigerant is sucked in the compressor and the cycle
carries on.
e)
In order to keep the evaporation pressure steady, and thus the refrigerant temperature in the heat exchanger,
a by-pass valve is injecting hot gaseous refrigerant in the circuit. On certain dryers, an automatic expansion valve
regulates this.
4)
Compressed air circuit
a)
The saturated hot compressed air flows into the Economiser where it is pre-cooled by the out flowing dry chilled
air. In the cold zone of the air refrigerant section it continues to cool
2. INTRODUCTION TO THE DRYER
3
down to dew point and enters the separator where condensates are collected. The outgoing chilled air is then
warmed up in the economizer by the hot incoming air.
b)
The condensates are collected after centrifugal separation and drained out through the automatic trap.
c)
As long as the compressed air temperature does not drop below dew point, there will be no condensation
in the air circuit.
5)
Refrigerant compressor
Being of the hermetic type, it requires no servicing.
6)
Condenser
a)
Th e air condensers are equipped with a helecoidal at the condenser refrigerant level.
On certain type of dryers, a water-cooled condenser can be fitted.
b)
In this case, a water valve being driven by the refrigerant circuit is taking care of its regulation.
7)
Refrigerant circuit protection
a) Klixon:
The single phase compressors are equipped with a klixon which is a thermal sensitive switch
controlling the temperature of the compressor and possible over intensity.
In case of malfunction, the klixon trips but switches on again automatically as soon as the compressor has
cooled down.
b) High Pressure Security Switch:
Refrigerant line is considered as a pressure vessel. That is why it is
protected against bursts by the help of manually reset switch. It is set to 362.5 psi for dryers working with
R134a
c) Filter dryer:
A refrigerant circuit is a closed circuit and total water removal in the refrigerant circuit is
paramount in order to obtain a correct functioning.
d)
To avoid problems, the refrigerant circuit must be vacuumed before loading the refrigerant.
It is equipped with a filter dryer, which also traps any solid particles, which may have migrated into the circuit
during assembly.
e)
Water-cooled dryers have a safety high-pressure switch.
In case of cooling water failure, the safety switch stops the dryer. When the safety switch has tripped out,
it has to be manually resettled before switching on the dryer.
8)
Refrigerant circuit controls
a)
Liquid refrigerant injection: The liquid refrigerant is into the evaporator by a control valve. This valve is a
thermostatic or pressostatic one maintaining a constant overheats of the refrigerant in the evaporator(s).
b)
Constant evaporating pressure: In the dryers equipped with a by-pass valve, the evaporating pressure is kept
constant by a controlled injection of hot gas from the high-pressure side into the low-pressure section of the circuit.
9)
Condensate drain - trap assembly
Dismantling the drain is easy because it can be isolated from the air circuit under pressure with a ball valve.
The drain has to be depressurized before being dismantled.
10)
Heat Exchanger Modular design
a)
The dryers are equipped with a compact Mono Bloc Heat Exchanger
module. This assembly has been specially designed to dry compressed air and is
made of:
1)
An Economiser which pre-cools the entering hot air with the out flowing cold air.
2)
An air/refrigerant exchanger cooling down the compressed air.
3)
A centrifugal separator concentrating all condensates and requiring no maintenance.
11) Accessories
a) Dew point indicator: Located on the control panel, it displays the value of the pressure dew point.
b) Temperature switch: Located inside the dryer, this temperature switch is adjustable from 32 °F up to 95 °F
c) Energy Saving Device: (ESD) This device helps dryer save energy when there is not any compressed air flow
in the dryer. (Please see the models have standart and optional in next page)
d) Filter change alarm on the front panel
4
3.1. Operation
A)
Control panels:
The control panel of the dryer includes the following elements:
1) Dewpoint indicator (Standard)
2) Filter change Alarm**
3)
Start / Stop Button
1) Dewpoint indicator (Standard)
2) Start Light
3) N/A
4) Filter change Alarm**
5) Main Switch
Triphase
ESD3
PDRCF4600575 - PDRCF4601200
1) ESD3 (Standard)
5) EMERGENCY STOP
ATTENTION : DN-US range dryers have low pressure drop according its competitors.
Do not use DN-US range dryers together with other dryers which have higher
pressure drop without getting the confirmation from our technical team.
** IMPORTANT NOTE: The Dryer has two Compressed Air Filter inside.
It is better to change filter element for the best efficiency when the alarm light is active.
It is recommended to keep replacement filter elements in your stock
in order to replace them when needed.
1
5
1
2 3
Monophase
Dew point
indicator
DN120-US - DN130-US
Monophase
Dew point
indicator
PDRCF1150029 - PDRCF2300288
3. OPERATION
2 3
1 4 5
5
3.2. During Operation
Regularly check the digital temperature controller ESD3 or dew point indicator on dryer.
B) Start up and shut-down
Warning:
Avoid leaving the dryer off when compressed air is still flowing through it.
C) Starting for the first time or after a long stop
1) Set the rotary switch to “I” This preheats the dryer and turns the drain system on.
It is recommended to leave the dryer power on permanently so the crankcase heater runs continuously.
3) Follow the daily starting and shut down procedure.
D) Daily starting and shut-down
1) Push on the green button to start the dryer.
2) The start light will indicate that the dryer is running.
3) To stop the dryer, first stop the airflow (either shut-down the air compressor or close the inlet/outlet or
by-pass valve) When the air flow is stopped set the rotary switch on “ 0 “ Set it again on “ I “ in order to keep the
preheating on.
4)
IMPORTANT NOTE!
Avoid leaving the dryer stopped when compressed air is still flowing through it.
5) To switch the already preheated dryer on again, simply push the green start button.
E) Digital Temperature Control technical features (ESD3)
ESD3:
PLC clear text multilingual indication of alarms, maintenance and running hours
+ Energy Saving Device automatic switching OFF at no load and ON when warm compressed air is entering.
(Please see the ESD3 manual which is given with Dryer)
2)
IMPORTANT NOTE!
After a long stop of the dryer it is MANDATORY to allow a preheating period of minimum
4 hours
before starting again, to avoid any compressed air flow during preheating.
Emax Air Dryer
RE F RIG ERATED TYPE COMP R ESSE D AIR DRYERS
Technical Specifications
& Diagram
7
Model
Capacity
(CFM)
Connection
Size
Voltage
Total
Electric
Power
Refrigerant
Type
Pressure
Drop
Max Work
pressure
(bars)
Max
Ambient
Temperatu
Max inlet
Temp.
PDRCF11500 29 29 1/2" 115 0.42 R134a <3 232 122 140
PDRCF11500 58 58 3/4" 115 0.68 R134a <3 232 122 140
PDRCF11501 15 115 1 1/ 2" 115 0.93 R134a <3 232 122 140
PDRCF11501 44 144 1 1/ 2" 115 1.28 R134a <3 232 122 140
PDRCF23002 88 288 2" 230 1.94 R134a <3 232 122 140
PDRCF46002 88 288 2" 460 1.94 R134a <3 232 122 140
PDRCF46005 75 575 3" 460 3.01 R134a <3 232 122 140
PDRCF23005 75 575 3" 230 3.01 R134a <3 232 122 140
PDRCF46008 50 850 3" 460 4.31 R134a <3 232 122 140
PDRCF46012 00 1200 3" 460 5.68 R134a <3 232 122 140
PDRCF46016 00 1600 3" 460 R134a <3 232 122 140
PDRCF46020 00 2000 3" 460 R134a <3 232 122 140
For All Models
Maximum Pressure 232 PSI
Maximum Ambient Temperature 122 F
Minimum Ambient Temperature 40F
Maximum Inlet Temperature 140 F
8
5.1
AIR FLOW DIAGRAMS
EDRCF1150029
-
EDRCFR1150144
M
IMPORTANT NOTICE:
5: Only From Dryer PDRCF1150115 to PDRCF1150144
9: Only from Dryer PDRCF1150115 to PDRCF1150144
9
10
5.2
ELECTRICAL DIAGRAMS
Dryair DN10-US - Dryair DN30-US
Electrical Circuit
12
Dryair DN40-US - Dryair DN80US
Electrical Circuit
15
Dryair DN100-US - Dryair DN110-US
Electrical Circuit
16
Dryair DN140-US - Dryair DN170-US
Electrical Power Circuit
Emax Air Dryer
RE F RIG ERATED TYPE COMP R ESSE D AIR DRYERS
General Arrengements
Main Settings
Drawings
18
Model
Drya ir DN10-US
1 * GKO50X + 1 * GKO50Y
MKO50 KIT
16.26
14.29
21.93
70.40
Drya ir DN20-US
1 * GKO50X + 1 * GKO50Y
MKO50 KIT
16.26
14.29
21.93
70.40
Drya ir DN30-US
1 * GKO50X + 1 * GKO50Y
MKO50 KIT
16.26
14.29
21.93
70.40
Drya ir DN40-US
1 * GKO150X + 1 * GKO150Y
MKO150 KIT
18.62
17.83
32.76
112.20
Drya ir DN50-US
1 * GKO150X + 1 * GKO150Y
MKO150 KIT
18.62
17.83
32.76
116.60
Drya ir DN60-US
1 * GKO150X + 1 * GKO150Y
MKO150 KIT
18.62
17.83
32.76
121
Drya ir DN70-US
1 * GKO500X + 1 * GKO500Y
MKO500 KIT
21.77
19.80
34.41
171.60
Drya ir DN80-US
1 * GKO500X + 1 * GKO500Y
MKO500 KIT
21.77
19.80
34.41
182.60
Drya ir DN90-US
1 * GKO500X + 1 * GKO500Y
MKO500 KIT
21.77
19.80
34.41
189.20
Drya ir DN 100 - US
1 * GKO851X + 1 * GKO851Y
MKO851 KIT
26.69
25.51
45.55
352
Drya ir DN 110 - US
1 * GKO1210X + 1 * GKO1210Y
MKO1210 KIT
26.69
25.51
45.55
363
Drya ir DN 120 - US
1 * GKO1210X + 1 * GKO1210Y
MKO1210 KIT
37.32
28.66
53.94
484
Drya ir DN 130 - US
1 * GKO1210X + 1 * GKO1210Y
MKO1210 KIT
37.32
28.66
53.94
506
Drya ir DN 140 - US
1 * GKO1820X + 1 * GKO1820Y
MKO1820 KIT
37.32
31.42
57.48
594
Drya ir DN 150 - US
1 * GKO1820X + 1 * GKO1820Y
MKO1820 KIT
37.32
31.42
57.48
627
Drya ir DN 160 - US
1 * GKO2700X + 1 * GKO2700Y
MKO2700 KIT
45.79
30.63
67.91
862.40
Drya ir DN 170 - US
1 * GKO2700X + 1 * GKO2700Y
MKO2700 KIT
45.79
30.63
67.91
902
Superheat of
thermostatic
expansion
valve
Evaporating
pressure
Fan
pressure
switch
Security
(*)
high
pressure
switch
Security
(**)
low
pressure
switch
Drain
timer
(***)
Low pres.
High Temp.
switch
(****)
Water flow
valve
(if water
condenser)
41OF - 50OF
29.7 psi
130 - 174 psi
362.5 psi
23.2 psi
1 min. - 5- sec.
5 min. - 4- sec.
113OF
159.5 psi
(*)
Available up to Dryair DN40-US and above
(**)
Available up to Dryair DN140-US and above
(***)
1 min. - 5 sec. (up to DN100-US and above)
5 min. - 4 sec. (up to DN90-US and above)
(****)
Available up to Dryair DN140-US and above
7. MAIN SETTINGS
6. GENERAL ARRANGEMENTS
19
Dryair DN10-US - Dryair DN30-US
8. ED and ID DRAWINGS
20
Dryair DN40-US - Dryair DN60-US
21
Dryair DN70-US - Dryair DN90-US
22
Dryair DN100-US - Dryair DN110-US
23
Dryair DN140-US - Dryair DN150-US
24
Dryair DN160-US - Dryair DN170-US
25
Dryair DN30-US
26
Dryair DN50-US
27
Dryair DN70-US
28
Dryair DN80-US
29
Dryair DN110-US
30
Dryair DN140-US
31
Dryair DN160-US
32
Dryair DN170-US
60
9. COMPONENTS LOCATION
61
Problem
Possible Cause
Repair
Comments
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 t he opp osite
direction.
Refrigeration unit is not functioning
Check refrigeration compressor
Seve ral factors can cause compresso r f ailure.
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 pr otect ed agains t exc essively high
refrigerant pressure. If the condenser efficiency has
reduced, the switch will trip. Manually reset the
switch.
In case of water cooled condensers, 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 h igh ambi ent temp erature may c ause the
refrigerant system to operate at higher than normal
pres sur es. Resul ts 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 eno ugh ambient tem peratu re.
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 protect ed aga ins t overly hi gh
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 designe d for working in calculated
con ditions (see descrip tion in this m anual ).
If co nditio ns are excee ded, 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,
caus ing high tempe rat ure in t he evapo rator.
Same will occur if water condenser is clogged with
mud or dirt. Air condenser and water condenser
should be per iodi cally chec ked and cl eaned.
Protect w ater cir cuit by an a dapt ed f ilter.
Too much compressed air flow.
Check actual flow
through the dryer.
This dryer is designed for a maximum air flow at
desi gn condit ions. If too much air is pum ped
into the dryer, water removal capacity may not be
sufficient, resulting in liquid carryover down stream.
Chec k the r ated outpu t the air comp ressor.
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 prot ected against high amp draw by
fuse and/or overload relay that can trip in case of
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 refri gerant
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 recei vers when
refrigerant com pressor 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 containi ng more
refrigerant
10. TROUBLESHOOTING
62
Problem
Possible Cause
Repair
Comments
Water in system
Compressed Air Inlet and
outlet connections are reversed.
Check inlet and outlet
connections.
This dryer is designed for air flow in one dire ction
only. Inlet and outlet directions are identified on
the dryer.
Drain system is clogged
or inoperative.
Restore a free flow of water
condensate. Check water
evacuation.
Drain system is timed solenoid valve,
pneumati cally assisted which has to be adjusted
in accordance with values listed in this manual.
The Solenoid valve includes a strainer that has to be
periodically checked and cleaned.
Membranes of pneumatically assisted drain have to
be checked or replaced every 6 months.
Bypass system is open
Check the valves
Impo rtant: B ypas s piping should be i nstalled
around the dryer so the dryer can be isolated for
serv ice without shuttin g down the ai r supply.
During dryer operation, valves must be set so all air
goes into the system. Check tightness
of the bypass system.
Free moisture remains in pipe lines.
Blow out the system
Before the dryer is first started all free moisture
should be blown out of the system.
Excessive air flow
Check actual flow through the
dryer.
This dryer is designed for a maximum air flow.
If too much air is pumped into the dryer, water removal
capacity may not be sufficient, resultingin liquid
Carry over downstream. Check the rated flow of the
air compressor .
Excessive free moisture
Check the separator and drain
system and compressor after
cooler ahead of the dryer.
In some system there may be an accumulation of free
moisture in the line ahead of the dryer. If this moisture
is pumped into the dryer intermittently, the water
removal capacity may not be sufficient.
A water separator should be installed in the line
before the dryer.
Excessive compressed
air inlet temperature.
Be sure that dryer is working
lower than design conditions
The dryer is designed to work for calculated design
conditions. Should the conditions be exceeded,
the dryer will be overflowed, dew point will go up
and protecting devices can switch off.
Clogged condenser fins
Clear fins of all obstructions
The clogged fins in the condenser will restrict air
passage and reduce refrigerant capacity causing
water downstream. Fins should be peri odically
checked and cleaned.
Shortage of refrigerant
Fix the leak and add a
charge of refrigerant.
Loss of refrigerant will cause improper functioning.
A qualified, refrigeration specialist should perform
the n ecess ary repai rs, or factory sh ould be
contacted if the unit is in warranty.
Refrigeration system is not functioning
Check to be certain refrigerant
compressor is running
To c heck if the com pres sor is runni ng, check
compressor-on light. lt is possible for the fan to be
operating but not the compressor.
Compressor not running can be caused by several
taeters. A qualified refrigeration technician should
che ck all refr igerant and electr ical con trols
Excessive pressure dew point
Readjust refrigerant
evaporating pressure
The refrigerant pressure adjustme nt s hould be
done by a qualified refrigeration engineer. This is
a very sensitiye device and incorrect settings may
create other failures.
High pressure drop
Excessive compressed
air flow or too law air inlet pressure.
Check actual pressure and
flow through the dryer.
This dryer is desi gned for a maximum air flow.
If t oo much air is pump ed i nto t he drye r,
water r emoval c apac ity may not be sufficient ,
re sulti ng in l iquid ca rr y- over d ownst ream.
Chec k the ra ted flow of the air com pressor .
Freeze up
Check that compressor room
ambient,
Frosting of the Iines is an indic ation that controls
are set too low. The fol lowing should be done by
an e xp erie nced ref rig era ti on te chn ici an.
Fan switch could have failed
in closed position keeping fan
on.
Controls may be adjusted in the fields by means of
the hot gas by pass valve . This is to be done
by a qualified refrigerant technician.
The unit will not run or
cycles off and on.
Clogged heat exchanger
Clean heat exchanger
with areverse air flow.
Dryer are supposed to be used with compressed
air free of any aggressive contami nants . Som e
contamination may require extra maintenanc e of
the heat exchanger.
Line disconnect switch is
open.
Close the start or disconnect
switch.
If the dryer is not operating, check the disconnect
switch or circui t breaker to be certai n it is on.
Fuse or breaker is open
Replace fuse or reset breaker.
The fuse to the power line s hould be checked and
replaced if needed. Never replac e a burnt fuse
with an oversized fuse.
Faulty refrigerant
compressor or controls.
Determine the cause and make
correction
Failure of compressor to run may be c aused by
several factors. A qualified refrigeration specialist
should check all electrical and refrigeration controls,
or factory should be contacted if unit is in warranty.
Excessive compressed air
inlet temperature.
Design conditions and correction
factors are described in this manual.
Be sure that dryer is working
in ambient temperatures
below design conditions.
The dryer is designed for working into calculated design
conditions. Shoul d th e co nditi ons be exce eded,
the dryer will be overflowed, dew point will go up and
protecting devices may trip.
63
Problem
Possible Cause
Repair
Comments
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 evap orator
temperature.
Important: there should be adequate air circulation
around the dryer, and proper ventilation in the
equipment room should guarantee a low enough
ambient temperature.
Clogged condenser fins
Clear fins of all obstructions.
The clogged fins in the condenser will restrict the air
passa ge and reduce the refri geration capaci ty,
cau sing high tem perat ure in the eva por ator.
Fins should be periodically checked and cleaned.
Shortage of refrigerant
Fix the leak and add a charge
of refrigerant.
Loss of refrigerant will cause improper functioning.
Dryers are equipped with a temperature switch which
maintains the amount of r efrigerant to maintain
proper cooling of the compressor.
A shortage of refrigerant may cause suction line to
become very hot, causing the temperature switch
to trip. A qualified refrigeration speci alist should
perform the necessary repairs.
Error sign occurs on
digital temperature
control device
The dew point is too low or too high.
Check refrigerant gas and
make sure that the working
conditions are within the correct range.
If there is not enough refrigerant gas or if the working
temperature and inlet temperatures are very high,
the dew point will increase.
Refrigerated Dryer
WARRANTY POLICY
When used under the conditions recommended the heat exchanger will be warranted for five (5) years. This warranty is
limited to the replacement of the heat exchangers,
Some restrictions as outlined below concerning misuse, abuse or accident. The standard equipment external
float drain and automatic drain carry a 90-day warranty.
This warranty will apply to equipment installed, operated and maintained in accordance with the procedures
and recommendations as outlined in the owner’s manual published by Emax During the life of this warranty,
Emax will repair or replace (at Polar airs option) any defective part or assembly free of charge if such defect occurred
in normal service and was not due to apparent misuse, abuse or accident.. Customer is responsible for shipping
charges.
This Warranty is not transferable.
Any warranty service performed in the field must be authorized by EMAX air Unauthorized service voids the
warranty and any resulting charges will not be paid by Emax
Polar air makes no other warranties or guarantees, expressed or implied. Polar air assumes no liability for
indirect or consequential damages
.
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