Page
51
Problem
Possible Cause
Repair
Comments
The unit will not
run or cycles off
and on.
Excessive ambient
temperature
Designed conditions and cor-
rection 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. 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
passage and reduce the refrigeration capacity,
causing high temperature in the evaporator.
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 refrigerant 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 specialist 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.
Drain Failure
Back pressure or
reduction of drain port.
Back First of all replace the
drain / drains. Open drain to
atmosphere (no back pressure)
- if hose / pipe is used to carry
the drain somewhere else;
keep or enlarge the diameter.
Max drain hose length after the dryer
must not exceed 10 meters.
Max drain hose height from the dryer
must not exceed 3 meters.
The drain port size should not be reduced.
There should not be any fitting that may cause
pressure drop such as valves, elbow, tees, etc.
on the drain connection.
Drain should be at atmospheric pressure at all times.
Any back pressure will result in failure
and malfunction.
Refrigerated Dryer (MH-US)
WARRANTY POLICY
When used under the conditions recommended by the manufacturer Mikropor, MH-US Dryer is warranted
to be free from defects in material and workmanship for a period of twenty-four (24) months from date
of receipt, not to exceed thirty (30) months from the factory ship date, provided Mikropor is furnished the
customer’s name, address, and date of shipment information.
The heat exchanger will be warranted for two (2) years. This warranty is limited to the replacement of the
heat exchangers, F.O.B. Factory, and subject to the same restrictions as outlined below concerning
misuse, abuse or accident. The standard equipment external float drain and optional 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
Mikropor during the life of this warranty, Mikropor will repair or replace (at Mikropor option) any defective
part or assembly free of charge F.O.B. its warehouse if such defect occurred in normal service and was not
due to apparent misuse, abuse or accident. This Warranty is not transferable. Any warranty service
performed in the field must be authorized by Mikropor Unauthorized service voids the warranty and
any resulting charges will not be paid by Mikropor. Mikropor makes no other warranties or guarantees,
expressed or implied. The merchantability of the components is expressly excluded. The manufacturer
assumes no liability for indirect or consequential damages.
