Application Data; Unit Operating Range; Minimum Chilled Water Flow (Units Without Hydronic Module) - Carrier AquaSnap 30RB Series Installation, Operation And Maintenance Instructions

6 - aPPlICaTION DaTa

6.1 - Unit operating range

30RB 162-262 "B" standard units and units with option 280
Evaporator
Entering water temperature at start-up
Leaving water temperature during operation
Condenser
Outdoor ambient operating temperature
Standard unit
Unit with option 28B-C (winter operation)
Unit with option 28 (winter operation)
available static pressure
Standard unit (outdoor installation)
Unit with option 12 (indoor installation)
30RB 302-802 units
Evaporator
Entering water temperature at start-up
Leaving water temperature during operation
Condenser
Outdoor ambient operating temperature
Standard unit
Unit with option 28B-C (winter operation)
Unit with option 28 (winter operation)
available static pressure
Standard unit (outdoor installation)
Unit with option 12 (indoor installation)
* For application requiring operation at less than 8 or 6.8°C respectively, contact
Carrier for unit selection using the Carrier electronic catalog.
** For an application, requiring operation up to +15°C leaving water temperature,
contact Carrier for the selection of the unit.
*** For operation from 0°C to -10°C the units must be equipped with option 28B-C
"Winter operation". For operation from 0°C to -20°C the units must be equipped
with option 28 "Winter operation". For both options the unit must either be
equipped with the evaporator frost protection option (for units without hydronic
module option) or the evaporator and hydronic module frost protection option
(for units with hydronic module option) or the water loop must be protected
against frost by the installer, using an anti-freeze solution.
Maximum outside temperature: For transport and storage of the 30RB units
the minimum and maximum allowable temperatures are –20°C and +48°C. It is
recommended that these temperatures are used for transport by container.
**** Unit with fans with available pressure up to 200 Pa.
† 30RB 162 units use option 28B-C for outside temperatures below 10°C.
Operating range 30RB 162-262 "B" standard units
and units with option 280
Leaving evaporator water temperature, °C
18
Minimum Maximum
°C 8* 40
°C 5 15**
Minimum Maximum
°C 0***/10† 48
°C -10 48
°C -20 48
Pa 0 0
Pa 0**** 200
Minimum Maximum
°C 6,8* 40
°C 3,3 15**
Minimum Maximum
°C 0*** 48
°C -10 48
°C -20 48
Pa 0 0
Pa 0**** 200
Operating range 30RB 302-802 units
48
-10
-20
3.3
Leaving evaporator water temperature, °C
Notes
1. Evaporator ∆T = 5 K
2. The evaporator is protected against frost down to -20°C.
legend
Standard unit operating at full load.
Operating range, units equipped with options 28 and 28B-C "Winter operation".
Option 28B-C (with two-speed lead fan for each circuit) allows operation down
to -10°C outside temperature.
Option 28 (with variable-speed lead fan for each circuit) allows operation down
to -20°C outside temperature. In addition to options 28 and 28B-C the unit must
either be equipped with the evaporator frost protection option (for units without
hydronic module option) or the evaporator and hydronic module frost protection
option (for units with hydronic module option) or the water loop must be protected
by the installer by adding a frost protection solution.
ATTENTION: Option 28 "Winter operation"
If the outside temperature is below -10°C and the unit has
been switched off for more than 4 hours, it is necessary to
wait two hours after the unit has been switched on again
to allow the frequency converter to warm up.
6.2 - Minimum chilled water flow (units without
hydronic module)
The minimum chilled water flow is shown in the table on
the next page. If the system flow is less than this, the
evaporator flow can be recirculated, as shown in the diagram.
For minimum chilled water flow rate
legend
1 Evaporator
2 Recirculation
15