Remote Condenser | Component Description |
Mixing Valve (Headmaster, Low Ambient Control Valve)
This valve serves as the head pressure regulating valve. It contains a pre-determined charge of nitrogen in the valve bellows. 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 217 psi 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.
Receiver
The quantity of liquid refrigerant in the receiver will vary with the temperature at the condenser coil.
Liquid Line Solenoid and Pump Down Low Pressure Control
When the bin is full or the ON-OFF switch is turned to the OFF position, the liquid line solenoid valve closes and the system begins to pump down. When the low pressure reaches 10-20 psi, the pump down low pressure control opens and the contactor shuts the machine off.
As the ice is removed from the bin or the ON-OFF switch is turned to the ON position, the liquid line solenoid valve opens and the high side and low side pressures begin to equalize. When the low side pressure reaches 50-75 psi, the pump down low pressure control closes and the machine begins a freeze cycle.
When the machine is off for extended periods of time (either a full bin or the ON-OFF switch in the OFF position), it will pump down approximately once every hour. This is due to the equalization of pressures during the off cycle resetting the pump down low pressure control. It is a normal function of the refrigeration system.
Condenser Fan Motor
The condenser fan motor is a single speed, permanent split capacitor motor and should be wired according to the wiring diagram. The motor is permanently lubricated for long service life.
