Carrier 30HXC User Manual

26


  
Evaporator entering water temperature °C 6.8* 21
Evaporator leaving water temperature °C 4** 15
  
Condenser entering water temperature °C 20*** 45
Condenser leaving water temperature °C 25 50
Outsideambientoperatingtemperature30HXC °C 6 40
* Forapplicationrequiringoperationatlessthan6.8°C,contactCarrierforunit
selectionusingtheCarrierelectroniccatalog.
** For application requiring operation at less than 4°C, the units require the use of
antifreeze.
*** Unitsoperatingatfullloadandbelow20°Ccondenserenteringwater
temperature require the use of a head pressure control with analogue water
controlvalves(seeparagraphonheadpressurecontrol).
 Maximumambienttemperature:fortransportandstorageoftheunitsthe
minimumandmaximumallowabletemperaturesare-20°Cand+70°C.Itis
recommendedthatthesetemperaturesarealsoappliedfortransportby
container.
† Foroperationinambienttemperaturesdownto-18°Ctheunitmustbeequipped
withoption28.

1. Evaporatorandcondenser∆T=5K
2. Forstart-upatfullloadwithacondenserwaterenteringtemperaturebelow
20°C,athree-wayvalvemustbeusedtomaintainthecorrectcondensing
temperature
3. Maximumcondenserwaterleavingtemperature50°C(atfullload)
4. Forlowevaporatorleavingtemperatures<+4°Cand>-6°Corderoption5

A Standardunitoperatingatfullload.
B Standardunitoperatingatreducedload.
C Unitsoperatingwithheadpressurecontrolwith
.
For transient operating modes (start-up and part load) the unit can operate
downtoacondenserwatertemperatureof13°C.
Additional operating range for high condensing temperature units and
non-reversibleheatpumps.
Evaporator leaving water temperature, °C
Condenser water entering temperature, °C
20
25
30
35
45
15
13
50
58
151054°C
A
C
B
13

The minimum chilled water ow is shown in the table on the next
page. If the ow is less than this, the evaporator ow 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.

1 Evaporator
2 Recirculation

The maximum chilled water ow is limited by the maximum
permitted pressure drop in the evaporator. It is provided in the table
on the next page. If the ow exceeds the maximum value, two
solutions are possible:
• Select a non-standard evaporator with one water pass less
which will allow a higher maximum water ow rate.
• Bypass the evaporator as shown in the diagram to obtain a
highter temperature difference with a lower evaporator ow
rate.

1

1 Evaporator
2 Bypass

Carrier 30HXC Specifications

General

Brand	Carrier
Model	30HXC
Category	Chiller
Language	English