Air Cooled Condenser (Self Contained); Water Cooled Condenser; Water Regulating Valve; Air Cooled Condenser (Remote) - Cornelius CCM0330 Service And Maintenance Manual

Refrigeration System

Air Cooled Condenser (Self Contained)

The air condenser is located in the back of the cabinet. Air is pulled
through the condenser by a fan motor and discharged through the right
hand side panel. The CCM1448 has 2 fan motors and discharges
through the right side and left side panels. The CCU Undercounter air
intake and discharge is through the front panel.
Do not block airflow as it will cause premature failure of the
machine and will void the warranty.

Water Cooled Condenser

If the machine has been properly installed, the water flow through the
condenser will be in a direction opposite the refrigerant flow. The water
condenser supply pressure must be between 20 psi (1.4 bar) and 60 psi
(4.1 bar). A water-regulating valve is used to control the flow of water
into the condenser. In areas that have poor water quality, the
condenser may eventually become coated with mineral deposits. This
will decrease the efficiency of the condenser resulting in high head
pressure. Water cooled condensers replaced due to excessive mineral
build up or freezing will not be covered under warranty.

Water Regulating Valve

The water-regulating valve controls the head pressure by regulating the amount of
water flow through the condenser. The bellows of the regulating valve are
connected to the high-pressure side of the refrigeration system. As the head
pressure rises, the bellows expand increasing the water flow through the water
condenser. Adjusting the spring pressure screw on top of the water valve can vary
the rate of water flow. The valve should be adjusted to maintain a discharge
pressure of 250 psi (17.01 bar) on R404a units. Water exiting the condenser should
be between 100°F (38°C) and 110°F (43°C). When the machine is off, the water
valve will close completely, stopping the flow of water through the condenser. If the
water flow does not stop when the machine is off, the valve may need cleaning or
replaced.

Air Cooled Condenser (Remote)

See Pages E5 and E7
High Pressure Safety Control (Manual Reset)
If the discharge pressure becomes excessive, the high-pressure safety
control will open and shut the machine off. The high-pressure safety control
opens at 450 psi (30.62 bar) on R404a units. The high-pressure safety
control is used on all water-cooled and remote units and select air-cooled units.
High Pressure Safety Control (Automatic Reset)
The automatic reset high pressure control opens at 450 psi (30.62 bar) and closes at
338 psi (23.00 bar). The high-pressure safety control is used on all water-cooled and
remote units and select air-cooled units.
Page E2