General Information
Unit Nameplate
The unit nameplate is located at the front of the unit. It includes the unit model number, serial number, electri- cal characteristics, refrigerant charge, and other pertinent unit data.
Compressor Nameplate
The nameplate for the compressors are located on the compressor shell.
Unit Description
Before shipment, each unit is leak test- ed, dehydrated, charged with refriger- ant and run tested for proper control operation.
The
The
Both heat exchanger types are leak tested to assure there is no cross leak- age between the water and refrigerant gas.
Water Connections
One inch brass swivel connections are provided for the
Water connections for the
Controls
The control system offered to control the unit is a Basic 24 volt control for the
All power wiring to the equipment is made at the unit contactor for the 2-
ton through
All low voltage wiring is made at the unit’s low voltage terminal board.
Wiring Connections
Troubleshooting and connection dia- grams for the equipment may be locat- ed in the back of this manual.
Basic 24V Controls
(for 2-ton through 6-ton units)
Safety devices for equipment contain- ing the basic 24V control option in- clude a low pressure switch and a freezestat to prevent compressor op- eration during low temperature activi- ty. The switch is set to activate at refrigerant pressures of 35 psig or 7 psig to fit most applications.
A high pressure switch prevents com- pressor operation during high or ex- cessive discharge pressures exceeding 395 psig.
The lockout relay communicates the low or high pressure situation to the compressor to prevent operation. The relay may be reset at the thermostat, or by cycling power to the unit.
General alarm may be accomplished through the lockout relay to drive light emitting diodes (LEDs) on a field sup- plied status indicating thermostat. Ter- minal 6 on the lockout relay is open for field use in malfunction indications.
This feature will drive dry contacts only, and cannot be used to drive field installed control inputs.
Deluxe 24V Controls (for
Units containing the Deluxe 24V con- trol design will incorporate a micro-
(which may be available for field use). See page 17 for diagnostic informa- tion.
Desuperheater
(Option for
The desuperheater pump fuse is locat- ed in the control box within a contain- er. The fuse is not factory installed to avoid possible pump damage at initial
Schrader Connections Connections for the low and high side of the refrigeration system are located conveniently on the unit’s right side for the
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