Technical information

UGH021/0301 VL Series Portable Chillers, 2 to 40 Tons

Page: 19

2. Conair recommends the addition of 20% inhibited

propylene glycol to the process fluid. This should help

prevent the process fluid from freezing and internal

components from rusting. A biocide must be added to the

water to prevent organism growth in the chilled water

system. See water treatment section in section 8 of this

manual for more information.

3. FOR AUTOMATIC FILL (IF

EQUIPPED): engage the

water supply to unit. The

level switch will activate the

make-up solenoid (figure

3.2A), which will open and

the water supply will fill the

reservoir tank. During

operations, with the water

supply source “on”, the unit

will automatically maintain

the correct reservoir level.

4. MANUAL FILL: disconnect the electrical power supply and

remove all necessary cover panels to access the reservoir

tank. Add fluid directly to the reservoir tank. When the

pump is first started, as process lines are filled and air is

purged, additional fluid may be required to restore the

reservoir to the correct level.

B. ELECTRIC MOTOR PHASING (PUMP ROTATION)

1. The operator must determine the unit is phased correctly.

This is done by visually inspecting the rotation of the pump

motor shaft and is outlined below. Incorrect phasing results

in poor operation and eventual damage to the unit.

a. Supply electrical power to the unit by engaging the

unit’s disconnect switch. Once the correct voltage

is supplied to the unit, the POWER light on the

unit’s instrument display will illuminate.

b. Remove the necessary covers panel to access the

pump motor. Note that electrical power is

engaged at this point and caution must be

observed while the electrical supply is engaged

and cover panels are removed.

c. Locate the electric motor (figure 3.2B) The operator

must identify the motor shaft inside the electric

motor housing. The motor shaft can be seen

through the vent slots in the motor housing or by

removing the shaft cover (figure 3.2C).

Figure 3.2ATypical make-up solenoid valve