Unit installation

Use and Maintenance Manual Air-cooled water chillers and Heat Pumps R-PAE/R-PAH/EAH Rev. 1 del 03/09

5. OPERATION

5.1 First check

Before starting the unit, make sure that:

Ø The evaporator water side is supplied with a suitable water flow according to the project;

Ø The hydraulic connections are carried out following the use and maintenance manual;

Ø The hydraulic circuit is charged and air free;

Ø The shut-off valves on the hydraulic circuit are open;

Ø All security conditions are respected;

Ø The unit is placed correctly on the floor;

Ø The service area is respected;

Ø The electric connections are performed correctly;

Ø The electric tension ranges within a tolerance of 10% compared to the unit nominal tension;

Ø The connection to ground is performed correctly;

Ø All electric and hydraulic connections are tight properly.

If a 3-phase scroll compressor is installed on the unit, when starting, check the rotation is correct. If the compressor

rotates in the opposite direction, it produces a higher noise level, it causes a pressure difference between

discharge and suction and its electric absorption is lower than scheduled; after few minutes of operation with the

reversed rotation, the internal heat protection can be enabled. If necessary, reset the correct rotation direction by

inverting two out of three phases in the input terminals of the main switch.

5.2 First startup

The first startup must be performed by a skilled refrigeration technician. The oil heaters must be energized for at

least 3 hours before the unit startup, and for 6 hours in case of screw compressors. Check the shut-off valves on

compressor and on the cooling circuit are open. Make sure all points described in the previous paragraph have

been checked.

To start the unit:

Ø Turn the main switch to “ON” position.

Ø Press the ON/OFF button on the microprocessor keyboard.

Compressors startup time-delay has a default value equal to 1 minute and it can be re-set. Check

all safety and control devices are working properly.

To stop the unit:

Ø Press the ON/OFF button on the microprocessor keyboard;

Ø If the unit must not work for more than 24 hours, turn the main switch to OFF position.

5.3 Microprocessor setting

Make sure the desired parameters are set on the microprocessor.

If the preset parameters need to be changed, proceed as described in the microprocessor manual (here

attached).

The standard units are designed to work with an outlet cooled water temperature higher than

5°C; for

operation at lower temperatures, use anti-freezing solutions having adequate properties. If necessary,

set the anti-freeze set point.