Unit installation

• Thermometer and pressure gauge connections should be provided on the inlet and outlet connections of each

cooler. Pressure gauges are recommended to check the water pressure before and after the cooler and to

determine if any variations occur in the cooler and system. When installing pressure taps to measure the amount of

pressure drop across the water side of the cooler, the taps should be located in the water piping a minimum of 24

inches downstream from any connection (flange etc.) but as near to the cooler as possible.

• Drain and air vent connections should be provided at all low and high points in the piping system to permit complete

drainage of the cooler and piping as well as to vent any air in the pipes. Hand shut-off valves are recommended for

use in all lines to facilitate servicing.

• The system water piping must be flushed thoroughly before connecting to the unit cooler. The cooler must not be

exposed to flushing velocities or debris released during flushing. It is recommended that a suitably sized bypass

and valve arrangement is installed to allow flushing of the piping system. The bypass can be used during

maintenance to isolate the cooler without disrupting flow to other units.

Any debris left in the water piping between the strainer and cooler could cause

serious damage to the tubes in the cooler and must be avoided. The

contractor/owner must also ensure that the quality of the water in circulation is

satisfactory, without any dissolved gases which can cause oxidation of steel

parts within the cooler.

• The following is a suggested piping arrangement at the chiller for single unit installations. For multiple chiller

installations, each unit should be piped as shown:

Isolating Valve - Normally Closed

Isolating Valve - Normally Open

Flow meter

Strainer

Balancing Valve

Pipe work

Flexible connection

Connection (flanged / Victaulic)

Pressure tapping

Flow Switch

OUT

Note: For chillers with two coolers, the connecting pipes for entering and leaving water on one cooler must be joined

to the corresponding pipes on the other cooler before connecting to the main headers in the system piping.

CAUTION