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After the legs have been attached and the unit has been moved into place check to make
sure the coil is level to ensure proper coolant drainage. If it is level bolt the unit to its
foundation.
ELECTRICAL WIRING
The electrical installation should be in accordance with National Electrical Code, local
codes and regulations. Proper fuse protection, starters, disconnect switches, etc., for the fan
motors must be provided in the field.
Electrical leads from each motor terminate at the unit junction box. Field connections
must be made from these leads thru a starter, fuse and disconnect in accordance with local, state
and national codes.
Three phase motors must be connected to three-phase power and voltage to agree with
motor nameplate.
PIPING
The design of the RH air-cooled heat exchangers is such that the cooling coil can be
either single or multi-pass. In a single pass unit, the coolant journeys only once through the coil.
Connections are made to the male NPT connectors on one end of the unit and the outlet
connections are made at the other end of the unit. If the unit is multi-pass the inlet connections
should be made to the higher of the two openings supplied per module, the outlet connection is
made with the lower of the openings. This piping arrangement is necessary to insure a cross-
counterflow coolant passage thru the unit for maximum heat transfer.
In most RH applications a surge tank is recommended to maintain a safe coolant level in
the system and allow entrained air to escape from the coolant.
START-UP AND OPERATION
Check all electrical connections to be sure that they are secure and safe. Start fan motors
and check each fan for proper rotation. Proper rotation should be counterclockwise looking from
beneath the unit. The air is discharged vertically through the top of the unit.
Check all fluid connections for leaks after filling and pressurizing the system.
After the above items are checked unit may be started and put into operation.
FREEZE PROTECTION
When installed in areas where freezing temperatures occur, precautions must be taken for
adequate anti-freeze protection of the radiator to prevent damage. Normal protection consists of
a 50% Ethylene Glycol and H2O solution. Water used should be neutral or slightly alkaline with
a PH of eight or more. Water should be treated with a reputable inhibitor to forestall corrosion.
The antifreeze and the inhibitor must be compatible.