Carrier 30H - Manual (Page 4)

CAUTION; Retìghten all condenser head bolts
before filling system with water. Torque bolts
to 150-170 Ib-ft.
Water leaving condenser is under pressure and
should not be connected directly into sewer lines.
Check local codes. A 3/8-in. drain plug is located in
the head at each end of the condenser.
Refer to Pressure Relief Devices concerning con­
nections for these components.
COOLER DESCRIPTION
The cooler is a direct-expansion type with remov­
able heads and is partitioned for multi-pass refrig­
erant flow. The water flow across the tube bundle
is directed by baffles designed for minimum water-
pressure drop. The tubes have integral internal fins
for maximum heat transfer efficiency.
Viewed from the front of the unit, the chilled
water enters (returns) at the left end of the cooler and
leaves at the right end. The sensing bulb for the
factory-set
water temperature controller is located
in the return-water nozzle; the return-water tem­
perature being the control point. The sensor for the
low
water-temperature cutout is located in the
leaving water nozzle.
The cooler is insulated with a flexible, closed­
cell plastic foam insulation of suitable thickness.
Water vapor cannot penetrate the cellular structure
to condense either within the cells or on the cooler
shell. Thus, the insulation itself is a vapor barrier.
Because of the toughness of the insulation, a pro­
tective sheet metal covering is not necessary.
The standard cooler can be used for all glycol
brines down to -20 F. However, for calcium or
sodium
chloride brines, it is important that the
proper inhibitors be carefully selected for protection
of the copper tubes. Refer to publications of the
Calcium Institute or the Mutual Chemical Division
of Allied Chemical Corporation for information
on corrosion control in calcium or sodium chloride
systems.
COOLER PIPING
Plan piping for minimum number of changes in
elevation. Install manual or automatic vent valve at
high points in line. Maintain system pressure by
using a pressure tank or combination relief and
reducing valve.
See Carrier System Design Manual, Part 3,
Piping Design, for chilled water piping detials.
Install thermometers in entering and leaving
water lines. Provide drain connections at all low
points
to permit complete drainage of system.
Connect shutoff valve to drain line before operating
unit. Install shutoff valves near entering and
leaving water connections. Use flexible connections
to reduce vibration transmission.
Insulate piping after leak testing to prevent heat
transfer and sweating. Cover insulation with mois­
ture seal.
All field wiring must conform with local code
requirements. Control circuit is 115 volts on all
60-Hertz units. Accessory transformer package is
available to allow 115 volts to be taken directly from
unit terminal block (see Fig. 3). Installation instruc­
tions are furnished with the accessory package. Con­
trol power may also be supplied from a separate
source thru a 15-amp fused disconnect.
Inside the control box, provision is made to
connect the ground wire which must be installed
with each field power supply.
All units are factory supplied with across-the-line
start at all voltages.
Refer to Table 4 for electrical data on individual
compressors and complete units and compressor
usage.
LABEL DIAGRAMS
The applicable Label Diagrams for the 30H040,
050,060 Heat Reclaim units are the same as for the
standard 30HK040,050,060 units.
Table 3 — Unit Voltage and Model Number
Step 5 — Make Electrical Connections
UNIT
30H
VOLTS
230 i
Model*
460 575 200
.....
040 ! 420 : 520 1 620 120
050 i 420 520 ‘ 620 > 120
060 420 520 I 620 120
*Last 3 digits of complete mode! number.
EQUIP GND
WHEN CONTROL CIRCUIT POWER IS FROM SEPARATE SOURCE
INCOMING WIRES ARE CONNECTED DIRECTLY TO
TERMINALS LL! AND LL2 ON TB2. ±2 MUST BE
CONNECTED TO NEUTRAL (GROUND) POTENTIAL.
CB — Circuit Breaker
EQUIP GIMD — Equipment Ground
TB — Terminal Board
*Appropriate transformer terminal depends on unit voltage,
instructions with accessory transformer package. H2 = 200 v;
H3 = 230 v; H4 = 460 v.
NOTE: For grounding 1 1 5-voit control circuit when transformer is
used, see instructions with accessory transformer package.
Fig. 3 — Wiring Schematic — Unitand Control
Power Supply