Carrier 30GX 082-358, User Manual

Page: 13 / 36

13
9 - APPLICATION DATA
9.1 - Unit operating range
Evaporator Minimum Maximum
Evaporator entering water temperature °C 6.8* 21
Evaporator leaving water temperature °C 4** 15
Condenser (water-cooled) Minimum Maximum
Condenser entering water temperature °C 20*** 42
Condenser leaving water temperature °C 25 45
Outside ambient operating temperature 30HXC °C 6 40
Condenser (air-cooled) Minimum Maximum
Outdoor ambient operating temperature °C 0 46
Available static pressure kPa 0
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 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).
In temporary operating modes (start-up and at part load) the unit can operate with a
condenser entering air temperature of 13°C.
9.2 - 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 temperature of
the mixture leaving the evaporator must never be less than
2.8 K lower than the chilled water entering temperature.
EVAPORATOR
RECIRCULATION
Compressors
Reference Size I nom. MHA LRA LRA (Y) LRA (S) 1 cp. LRA (S) 2 cp.
06NA2146S7N 39 70 95 605 191 220 -
06NA2174S7N 46 90 120 715 226 260 -
06NA2209S7N 56 113 145 856 270 330 420
06NA2250S7N 66 130 175 960 303 380 500
06NA2300S5N 80 156 210 1226 387 445 550
06NA2300S5E 80+ 174 240 1265 400 460 600
Legend:
06NA
- Compressor for air-cooled units
N - Non-economized compressor
E - Economized compressor
INOM - Average current draw of the compressor at Eurovent conditions
MHA - Must hold amperes (maximum operating current) at 360 V
LRA - Locked rotor current with across-the-line start
LRA (Y) - Locked rotor current at reduced current (star/delta start-up mode)
LRA (S) 1 cp. - Start-up with reduced current with electronic starter (start-up duration 3 seconds max.) for one compressor per circuit
LRA (S) 2 cp. - Start-up with reduced current with electronic starter (start-up duration 3 seconds max.) for two compressors per circuit
FOR MINIMUM CHILLED WATER FLOW RATE
9.3 - Maximum chilled water flow
The maximum chilled water flow is limited by the maximum
permitted pressure drop in the evaporator. It is provided in the
table on the next page. If the flow exceeds the maximum value,
two solutions are possible:
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.
EVAPORATOR
BYPASS
FOR MAXIMUM CHILLED WATER FLOW RATE