Carrier 30HL050 - Manual (Page 17)

The cooler fluid inlet and outlet connections are grooved-
end. On 30HW units, the fluid enters at the top connection
and leaves at the bottom connection. Procedures for making
the grooved-end connections are the same as for the 30HWB
condensers. See 30HWB Condenser section on page 16 for
more details.
Run the pump for 10 minutes, then clean the strainer be-
fore starting the unit.
A cooler flow switch must be field-installed on all units.
This should be a differential pressure switch that is installed
between the cooler fluid inlet and outlet. The switch should
be set to open when the cooler fluid flow drops below the
values shown in Table 3. Use the cooler water pressure drop
curves (Fig. 16) to determine correct setting for each unit
size. Use Carrier accessory flow switch, part number
30HW900003. See Table 3 for Minimum Flow rates and loop
volumes.
See Step 6 — Make Electrical Connections section on
page 19 for flow switch wiring details.
30HK, HL Units — The thermistor used for sensing fluid
temperature is factory-installed in the cooler leaving fluid
line.
30HW Units — The thermistor used for sensing the fluid
temperature is inside the cooler leaving-water cavity.
Table 3 — Minimum Cooler and Condenser Flow
Rates Minimum Loop Volume
UNIT SIZE
COOLER CONDENSER*
MINIMUM COOLER
LOOP VOLUME†
Gal./Min L/s Gal./Min L/s Gal. L
30HK040 56.0 3.5 67 4.23 120 454.2
30HK,HL050 68.0 4.3 76 4.79 148 560.2
30HK,HL060 68.0 4.3 83 5.24 174 658.6
30HW018 22.5 1.4 22.5 1.4 44 167
30HW025 30.0 1.9 30.0 1.9 59 223
30HW028 37.5 2.4 37.5 2.4 76 288
30HW035 45.0 2.8 45.0 2.8 85 322
30HW040 57.0 3.6 57.0 3.6 113 428
LEGEND
ARI — Air Conditioning and Refrigeration Institute
N
— Liters per kW
V — Gallons per ton
*30HK, HWB, HWC and HWS only.
†Minimum system fluid volumes.
NOTES:
Gallons = V x ARI capacity in tons.
Liters = N x ARI capacity in kW.
APPLICATION V N
Normal Air Conditioning 3 3.25
Process Type Cooling 6 to 10 6.5 to 10.8
Low Ambient Operation 6 to 10 6.5 to 10.8
COOLER PRESSURE DROP — 30HW UNITS COOLER PRESSURE DROP — 30HK, HL UNITS
NOTE: Ft of water = 2.31 x change in psig.
Fig. 16 — Cooler and Condenser Water Pressure Drop
17