Ice-O-Matic EF Series ユーザーズマニュアル

 

Remote System 
Machines that use remote condensers have several components that are not used in self 
contained machines.  A mixing valve controls the head pressure when the ambient 
temperature at the condenser drops below 70°F (21°C).  When the bin fills with ice or is 
turned off at the selector switch, the machine will pump all the refrigerant into the receiver 
before shutting off. 
 
Remote Condenser 
For proper operation, the remote condenser must be installed properly.  
Improper installation will void the warranty.  See remote guidelines on 
page A10.  The location of the remote condenser should be such that the 
ambient air temperature does not exceed 120°F (48.9°C).  If ambient 
temperature exceeds 120°F (48.9°C) ice production will decrease until the 
ambient temperature decreases.  
    
If the airflow is restricted or the condenser is dirty, the head pressure will 
be excessively high, slow production will result and the compressor may 
overheat and eventually become damaged.  The condenser coil and fan 
blades must be kept clean.  The condenser can be cleaned with 
compressed air or by using a brush.  If a brush is used, brush in the direction of the fins 
taking care not to bend the fins.  If the condenser fins are bent, this will restrict the airflow 
through the condenser and the fins will need to be straightened with a fin comb. Problems 
related to a dirty condenser or poor airflow will not be covered under warranty. Note: The 
condenser fan motor runs continually, it will shut off when the icemaker shuts off. 

 

 
Mixing Valve (L.A.C., Headmaster) 
When the temperature at the condenser is above 
70°F (21°C), the refrigerant flow from the 
compressor is directed by the mixing valve 
through the condenser and into the receiver.  
When the temperature at the condenser drops 
below 70°F (21°C), the pressure in the bellows of 
the mixing valve becomes greater than the 
pressure of the liquid refrigerant coming from the 
condenser.  This change allows the valve to 
partially restrict the flow of refrigerant leaving the 
condenser and allows discharge gas to by-pass 
the condenser and flow directly into the receiver, 
mixing with the liquid refrigerant from the 
condenser.  The amount of discharge gas that 
bypasses the condenser increases as the ambient 
temperature decreases.  This action of the mixing 
valve allows the discharge pressure to be maintained at approximately 240 psi (16.5 bar) 
during low ambient conditions.  If the refrigerant system is undercharged and the ambient 
temperature is below 70°F (21°C), the mixing valve will not work properly.  The mixing valve 
will allow too much refrigerant to bypass the condenser.