York YCAL0041 User Manual download pdf (Page 75)

YORK INTERNATIONAL

FORM 150.64-EG1

2. Refrigerant ﬂow through the compressor with 100%

suction cooled motor.

3. Large suction side free volume and oil sump to

provide liquid handling capability.

4. Compressor crankcase heaters to provide extra

liquid migration protection.

5. Annular discharge check valve and reverse vent

assembly to provide low pressure drop, silent shut

down and reverse rotation protection.

6. Initial Oil charge.

7. Oil Level sightglass.

8. Vibration isolator mounts for compressors.

9. Brazed-type connections for fully hermetic refrig

erant circuits.

2.03 REFRIGERANT CIRCUIT COMPONENTS

Each refrigerant circuit shall include: liquid line shutoff

valve with charging port, low side pressure relief device,

ﬁlter-drier, solenoid valve, sight glass with moisture indi

cator, expansion valves, and ﬂexible, closed-cell foam

insulated suction line.

2.04 HEAT EXCHANGERS

A. Evaporator:

1. Evaporator shall be brazed-plate stainless

steel construction, single or dual circuit heat

exchangers capable of refrigerant working

pressure of 450 psig (3103 kPa) and

liquid side pressure of 150 psig (1034 kPa)

(Option for 300 psig [2068 kPa] available.)

2. Evaporator shall be covered in 3/4" (19mm)

ﬂexible, closed cell insulation, thermal conduc

tivity of 0.26k (BTU/HR-FT

°F]/in.) maximum.

3. C o o l e r s h a l l h a v e t h e r m o s t a t i

cally controlled heaters to protect to -20°F

(29°C) ambient in off-cycle.

4. Brazed plate heat exchangers shall be UL

listed.

5. Installing contractor must include accomoda

tions in the chilled water piping to allow prop

er drainage and venting of the heat exchang

er. A strainer with a mesh size between 0.5

and 1.5mm (40 mesh) is recommended up

stream of the heat exchanger to prevent clog

ging.

B. Air Cooled Condenser:

1. Coils: Internally enhanced, seamless copper

tubes, mechanically expanded into aluminum

alloy ﬁns with full height collars. Subcooling coil

an integral part of condenser. Design working

pressure shall be 450 PSIG (31 bar).

2. Low Noise Fans: Shall be dynamically and

statically bal anced, direct drive, corrosion re

sistant glass ﬁber reinforced composite blades

molded into a low noise, full-airfoil cross section,

providing vertical air discharge and low

sound. Each fan in its own compartment

to prevent crossflow d u r i n g f a n

cycling. Guards of heavy gauge, P V C

(polyvinylchloride) coated or galvanized

steel.

3. Fan Motors: High efﬁciency, direct drive, 6 pole,

3 phase, insulation class “F”, current protected,

Totally Enclosed Air-Over (TEAO), rigid

mounted, with double sealed, permanently lu-

bricated, ball bearings.

2.05 CONTROLS

A. General: Automatic start, stop, operating, and pro-

tection sequences across the range of scheduled

conditions and transients.

B. Microprocessor Enclosure: Rain and dust tight

NEMA 3R/12 (IP55) powder painted steel cabinet

with hinged, latched, and gasket sealed door.

C. Microprocessor Control Center:

1. Automatic control of compressor start/stop,

anti-coincidence and anti-recycle timers, au-

tomatic pumpdown on shutdown, condenser

fans, evaporator pump, evaporator heater, unit

alarm contacts, and chiller operation from 0°F

to 125°F (-18°C to 52°C) ambient. Automatic

reset to normal chiller operation after power

failure.

2. Remote water temperature reset via a Pulse

Width Modulated (PWM) input signal or up to

two steps of demand (load) limiting.

3. Software stored in non-volatile memory, with

programmed setpoints retained in lithium bat-

tery backed real time clock (RTC) memory for

minimum 5 years.

4. Forty character liquid crystal display, descrip-

tions in English (or Spanish, French, Italian, or

German), numeric data in English (or Metric)

units. Sealed keypad with sections for Setpoints,

Display/Print, Entry, Unit Options & clock, and

On/Off Switch.

5. Programmable Setpoints (within Manufacturer

limits): display language; chilled liquid tempera-

ture setpoint and range, remote reset tempera-

ture range, set daily schedule/holiday for start/

stop, manual override for servicing, low and high

ambient cutouts, number of compressors, low

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York YCAL0041 User Manual Page 75

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