Specifications

APPLICATION DATA

Unit operating range

Cooler Minimum Maximum

Cooler entering water temperature °C 6.8* 21

Cooler leaving water temperature °C 4** 15

Condenser (water-cooled) Minimum Maximum

Condenser entering water temperature °C 20*** 42

Condenser leaving water temperature °C23 45

Condenser (air-cooled) Minimum Maximum

Outdoor ambient operating temperature °C0 45

COOLER

RECIRCULATION

FOR MINIMUM CHILLED WATER FLOW RATE

Minimum chilled water flow

The minimum chilled water flow (maximum chilled water

temperature difference) is shown in the table below. If the flow

is less than this (a high temperature difference) three solutions

are possible :

a - Check for availability of a non-standard evaporator (plus one

pass) which will allow a lower water flow rate (contact factory).

b - The evaporator flow can be recirculated as shown in the

diagram. The temperature of the mixture leaving the evaporator

must never be less than 2.8 K lower than the chilled water

entering temperature.

c - Link several chillers in series with each making a contribution

to the total temperature difference.

Notes :

* For application requiring operation at less than 6.8°C, contact Carrier s.a. for unit selection

using the Carrier electronic catalog.

** For application requiring operation at less than 4°C, the units require the use of antifreeze.

*** Water-cooled units (30HXC) operating at less than 20°C for condenser entering water require

the use of head pressure control with analogue water valves (see head pressure control

paragraph).

Maximum chilled water flow

The maximum chilled water flow (> 0.09 l/s per kW or < 2.8 K

temperature difference) is limited by the maximum permitted pressure

drop in the evaporator. It is provided in the following table :

a - Select a non-standard evaporator with one water pass less

which will allow a higher maximum water flow rate.

b - Bypass the evaporator as shown in the diagram to obtain a

highter temperature difference with a lower evaporator flow

rate.

COOLER

BY-PASS

FOR MAXIMUM CHILLED WATER FLOW RATE