These modern multiple-compressor liquid chilling pack
ages offer all the conveniences and economy of packaged
design, for use in chilled water air-conditioning systems and
various types of process cooling applications. Every
machine is completely factory engineered and assembled to
ensure a perfectly balanced refrigeration system. All com
ponents are matched to perform with high efficiency and
low power consumption. Only external water and electrical
connections must be completed to make the water-cooled
unit operational. Condenserless models require, in addition,
only refrigerant line connections to the remote condenser.
The water-cooled model (30HR) is a complete onepackage system with two condensers having built-in sub
coolers, and a direct expansion cooler with two refrigerant*,
circuits, one for each condenser.
FEATURES
• Low Inrush and Running Current because of sequential
starting and stopping Multiple Compressors*.
• Easy to Service bolted-hermetic compressors.
• Wide Range of Distribution Voltages (208 v to 600 v)
allowed by Carrier Voltage Standards*.
• Protection against Single-Phasing of compressor motors,
assured by manual reset, magnetic-trip circuit breakers.
• Internal Motor Protection against overheating, provided
by quick-sensing elements embedded in motor windings.
• Optimum Control of Chilled Water Temperature for
closer Capacity Control provided by Multiple-Step
Controller.
Model 30HS is a condenserless 30HR, designed for use
with remote water-cooled, air-cooled or evaporative type
condensers Includes all features of the 30HR.
Multiple serviceable compressors are mounted on spring
vibration isolators to minimize sound and vibration trans
mission to the unit frame and the building structure.
Hot-gas mufflers dampen compressor gas pulsations, giving
smooth, quiet operation.
Each refrigerant circuit includes a thermal expansion
valve, a liquid line solenoid valve, a filter-drier and
combination liquid line sight glass and moisture indicator.
Compact construction allows passage thru 36-inch door
way. Little floor space required for installation.
• Balanced Wear on Compressors assured by manual
transfer switch, which changes the lead compressor in the
starting sequence.
• Increased System Capacity, without raising horsepower
requirements, afforded by refrigerant subcooling.
• Protection against Refrigerant Migration and Oil Dilution
provided by compressor crankcase heaters, which are on
during compressor off cycle.
• Reduced Power Costs because of partial load operation
at higher suction temperatures made possible by two
Chilled Water Rise...............................................................................10 F
Entering Condenser Water Temp .....................................................85 F
Fouling Factor (Cooler and Condenser)
FOR 30HR (WATER-COOLED CONDENSER):
Enter the Ratings table marked 44 F Leaving Chilled Water
Temperature. Read down the left column (CAP ) to 80 tons
Note that either a 080 or 090 unit may be selected. Final unit
selection should be based on present and future job requirements
and the economics of the job. For this example, data from the
table is shown below for a 080 unit.
..............................................
............................................
PERFORMANCE DATA
44 F
0005
II Determine from Ratings table operating data for selected unit.
Saturated Discharge Temp (SDT)
Compressor Motor Power input (KW)
Total Heat Rejection (THR) ....................................................101.5 Tons
Cooler Water Flow ..................................................................192.0 Gpm
Cooler Water Pressure Drop (PD)
Condenser Water Flow
Leaving Condenser Water Temp (Lwt)...........................................95.6 F
Condenser Water Pressure Drop (PD)
For fouling factors other than .0005 refer to the Correction For
Fouling Factors table to: adjust the required capacity, correct
the compressor power input, and correct the actual condenser
water quantity required. ForA t (SDT — entering cond water
temp) other than 30 F, refer to curve.
FOR 30HS (CONDENSERLESS):
Use the same method, with the exception that the condenser
water data do not apply. For the remote condenser data, refer to
appropriate Carrier condenser data publication.
Ratings are based on .0005 fouling factor in the cooler and
condenser. Correction factors for other fouling factors are given in
the following table:
CORR FACTOR
FOULING
FOR CAPACITY
FACTORAND COND WATER
Condenser
1 02
1.00
Clean
.0005
Cooler
1.01
1 00
.001.98
.002
To correct capacity, adjust as follows:
a Adjusted required capacity (use to enter table)
_______
cooler factor x condenser factor
b. Actual compressor power input
= compressor kw (from table) x correction factor for
power input
c. Actual condenser water quantity
= gpm (from table) x cooler factor x condenser factor
-
required capacity
.94
________
CORR FACTOR
FOR
POWER INPUT
Condenser
98
1.00
1 03
1.10
Ratings based on: 10 F chilled water rise (suitable for 5 F to
15 F rise without adjustment), .0005 fouling factor in cooler (and
condenser on model 30HR), 15 F subcooling, and R-22.
Ratings in boldface type (44 F chilled water page) are in
accordance with the latest ARI Standard 590. Conditions:
30HR — 44 F leaving chilled water temperature with 10 F rise,
95 F leaving condenser water temp with 10 F rise and .0005 fouling
factor in cooler and condenser.
30HS — 44 F leaving chilled water temperature with 10 F rise,
.0005 fouling factor in cooler, 105 F condensing temperature for
remote water-cooled or evaporative condenser, 120 F condensing
temperature for air-cooled condenser.
Ratings based on 15 F subcooling. On 30HR units this occurs at
30 F A t (SDT — entering condenser water temperature.) When a
30HR (water-cooled condenser) unit is selected at conditions other
than 30 F A t use the curve below to correct the ratings table
capacity.
RATINGS
The following ratings tables are for both 30HR (water-cooled
condenser) and 30HS (condenserless) models. Condenser water data
apply to model 30HR only. Ratings beyond limits shown and/or
brine ratings are available in Carrier Application Data publications.
Ratings shown for Saturated Discharge Temperature (SDT) over
120 F do not apply to model 30HR.
Correction = Ratings table capacity x percent capacity correction
(from above curve).
Above 30 F At add the correction to rating table capacity.
Below 30 F At subtract the correction from rating table capacity.
30HS units matched with remote condensers which have greater
than (less than) the 15 F subcooling in the ratings, increases
(decreases) system capacity. To adjust capacity, multiply capacity
ratings by 0,94, then adjust this result upward by 0 4 percent for
each degree F of available subcooling