JOHNSON CONTROLS
FORM 150.26-EG1 (116)
72
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, discharge service valve, system high
pressure relief device, sight glass with moisture indicator, expansion valves, and flexible,
closed-cell foam insulated suction line.
2.04 HEAT EXCHANGERS
A. Evaporator:
1. Evaporator shall be a direct expansion shell and tube construction, dual circuit heat
exchanger capable of refrigerant working pressure of 400 PSIG (27.6 bar) and liquid
side pressure of 150 psig (10.3 bar).
2.
Evaporator shall be covered with 3/4” (19mm), flexible, closed-cell insulation, ther
-
mal conductivity of 0.26k ([BTU/HR-Ft2-°F]/in.) maximum. Water nozzles shall be
insulated by Contractor after pipe installation.
3.
Heat exchangers shall be ASME pressure vessel code certified.
4. Installing contractor must include accommodations in the chilled water piping to al-
low proper drainage and venting of the heat exchanger.
5. The water connections shall be fully accessible and grooved to accept ANSI/AWWA
C-606 cou plings if used (by others).
B. Condenser:
1. Condenser shall be a cleanable thru-tube construction with removable heads and
integral subcooling. Heat exchanger shall be capable of a refrigerant side working
pressure of 560 PSIG (45 bar) and liquid side pressure of 150 psig (10.3 bar).
2. The condenser shall be equipped with relief valves and be capable of holding the
full refrigerant charge for pumpdown.
3. The water connections shall be fully accessible and grooved to accept ANSI/AWWA
C-606 cou plings if used (by others).
2.05 CONTROLS
A. General: Automatic start, stop, operating, and protection sequences across the range
of scheduled conditions and transients.
B. Microprocessor Enclosure: NEMA 1 (IP32) 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 tim-
ers, automatic pumpdown on shutdown, evaporator pump, and unit alarm contacts.
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 lithi-
um battery backed regulated time clock (RTC) memory for minimum 5 years.
Guide Specifications (Cont'd)
Содержание YCWL Series
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