Application Data; Unit Operating Range; Minimum Chilled Water Flow - Carrier 30GX Installation, Operation And Maintenance Instructions
Screw compressor water-cooled liquid chillers and air-cooled liquid chillers
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6 - aPPlICaTION DaTa
6.1 - Unit operating range
Evaporator 30HXC - 30GX
Evaporator entering water temperature
Evaporator leaving water temperature
Condenser (water-cooled) 30HXC
Condenser entering water temperature
Condenser leaving water temperature
Outside ambient operating temperature 30HXC °C
Condenser (air-cooled) 30GX
Outdoor ambient operating temperature
Available static pressure
*
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.
*** Water-cooled units (30HXC) 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 30GX and
30HXC 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.
6.1.1 - Operating range 30HXC
58
50
45
35
30
25
20
15
13
4
5
Evaporator leaving water temperature, °C
Notes
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
legend
A
Standard unit operating at full load.
B
Standard unit operating at reduced load.
C
Units operating with head pressure control with analogue water control
valve.
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.
20
Minimum
Maximum
°C
6.8*
21
°C
4**
15
Minimum
Maximum
°C
20***
45
°C
25
50
6
40
Minimum
Maximum
°C
0†
46
kPa
0
B
A
C
10
13
15
°C
6.1.2 - Operating range 30GX
°C
46
D
45
43
42
0
-18
4
Evaporator leaving water temperature, °C
Notes
1.
Evaporator ∆T = 5 K
2.
If the ambient temperature can be below freezing, the evaporator must be
protected against frost.
3.
Available static pressure zero.
4.
For low evaporator leaving temperatures <+4°C and >-6°C order option 5
legend
A
Standard unit operating at full load.
B
Standard unit operating at reduced load.
C
With year-round operation option.
D
Operating limit, units 30GX 267 and 358 at full load.
6.2 - Minimum chilled water flow
The minimum chilled water flow is shown in the table on the
next page. If the flow is less than this, the evaporator flow
can be recirculated, as shown in the diagram. The tempera-
ture of the mixture leaving the evaporator must never be
less than 2.8 K lower than the chilled water entering tempe-
rature.
legend
1
Evaporator
2
Recirculation
B
A
C
°C
7
11
15
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