Manual

2500AC
SPECIAL INSTRUCTIONS
WATER PUMP
The water pump is controlled by the manual switch for off and on operations. The motor on
this pump has a built-in overload protection, as do all the motors in our system.
ELECTRICAL CONTROLS - Control Circuit 24 Volts
This unit has two separate 12.5-ton refrigeration systems, each system having its own
wiring circuit. Both circuits are the same. The control circuit for the refrigeration system has
several controls wired in series. First are the high and low-pressure switches that are
mounted in the control panel. The high-pressure switch will shut off the refrigeration
system in the event the pressure is too high. High pressure can be caused by the
condenser becoming restricted, by foreign material on the outside surface of the
condenser, or if the fan motor (air cooled) is not running. If the high-pressure limit switch
should cut out, there is a manual reset switch, which is located at the control panel on the
right side. In order to reset this switch, the disconnect switch, and the compressor switch
must be turned off and the control panel door must be open. If and when the high-pressure
switch is off, check the "Trouble Shooting" chart for diagnosis.
The low-pressure switch will cut out at any time the pressure in the refrigeration system is
below 25 psi. Low psi can be caused by a freeze up in the water reservoir, a leak in any
sort of restriction in the system. If the switch cuts out, it will automatically reset. Never try
to adjust the high and low-pressure switches or by-pass them, or serious damage to
the system will result. Adjustment should only be made after the internal pressure of the
refrigeration system has been read.
The second control of the circuit is the temperature controller. It controls the cycling of the
refrigeration system. Once this control is set, it will control the cycling of the unit
automatically. Do not set it below freezing unless the proper amount of antifreeze is put
into the unit. Since antifreeze is a poor conductor of heat, never add more than necessary.
The third control on the circuit is the manual compressor switch. It is only used to turn the
refrigeration system on or off. The two fan relays are used to allow the fan motor (air
cooled) to operate with either system.
The fourth part on the circuit is the overload protection on the compressor. It will open if
the unit becomes low on refrigeration or if the improper voltage is used. This part of the
circuit is an automatic reset.