Guide specifications — 30HS
Condenserless Reciprocating Liquid Chiller
HVAC Guide Specifications
Size Range:
70 to 160 Tons (250 to 560 kW)
Carrier Model Number:
30HS070-160
Part 1 — General
1.01 SYSTEM DESCRIPTION
A. Electronically controlled reciprocating-type liquid
condenserless chiller utilizing semi-hermetic type
compressors.
1.02 QUALITY ASSURANCE
A. Unit performance shall be based on ARI Standard 590
(U.S.A.) at standard rating conditions.
B. Unit construction shall comply with ASHRAE 15 lat-
est revision safety standard, NEC, and applicable
ASME codes (U.S.A.).
C. Unit(s) shall be UL (U.S.A.) listed and CSA certified.
D. Unit shall be certified in accordance with ISO 9002
manufacturing quality standard.
1.03 DELIVERY, STORAGE AND HANDLING
A. Unit shall be shipped factory assembled with all re-
frigerant piping and control wiring factory installed.
B. Unit shall be shipped pre-charged with a holding
charge of R-22.
C. Unit to be stored and handled according to manufac-
turer’s recommendations.
Part 2 — Products
2.01 EQUIPMENT
A. General:
Factory-assembled, single-piece, liquid chiller consist-
ing of motors, compressors, direct expansion cooler,
initial oil operating charge, refrigerant holding charge,
and all controls, safeties, and hardware required prior
to start-up.
B. Compressors:
1. Reciprocating serviceable semi-hermetic type only.
2. Each compressor shall be equipped with an auto-
matically reversible oil pump, operating oil charge,
suction and discharge shutoff valves, and oil sight
glass.
3. Factory mounted on spring vibration isolators.
4. Motors shall be cooled by suction gas passing
around motor windings and shall be thermally
protected.
5. Each compressor shall be factory equipped with
an insert-type crankcase heater to control oil di-
lution during shutdown.
6. Motor speed shall not exceed 1750 rpm (29.2 r/s).
7. Equipped with electrically-actuated suction cut-off
cylinder unloaders.
8. Same manufacturer as chiller.
C. Cooler:
1. Shell-and-tube type with removable heads. Seam-
less copper tubes shall be rolled into tube sheets.
2. Single fluid pass type with multiple internal polypro-
pylene baffles.
3. Design shall be dual independent, direct expan-
sion, refrigerant circuit type.
4. Shell shall be insulated with
3
⁄
4
-in. (19 mm) closed
cell polyvinyl chloride foam insulation or suitable
alternate.
5. Cooler shall be tested and stamped in accordance
with ASME code (U.S.A.) for refrigerant side work-
ing pressure of 235 psig (1620 kPa). Cooler shall
have a maximum fluid-side working pressure of
300 psig (2068 kPa).
D. Condensers:
1. Remotely located type (normally air-cooled).
2. Design and construction shall provide positive sub-
cooling of liquid refrigerant.
E. Refrigerant Components:
Each refrigerant circuit shall include the following mini-
mum components:
1. Hot gas muffler.
2. Moisture indicating sight glass.
3. Hermetic filter drier.
4. Maximum operating pressure type electronic ex-
pansion valve with a minimum 760-step control
with
3
⁄
4
-in. (19 mm) variable refrigerant metering.
5. Liquid line solenoid valve.
6. Charging valve.
7. Discharge gas thermostat.
8. Close-fitting cellular foam insulation on all suction
lines.
F. Controls, Safeties and Diagnostics:
1. Controls:
a.
Unit controls shall include the following mini-
mum components:
1) Microprocessor.
2) Power and control circuit terminal blocks.
3) RUN/STANDBY control power switch.
4) Replaceable solid-state relay panel and
electronic expansion valve control.
5) Control panel with keypad and display
module.
6) Thermistors.
7) External communication port.
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