be circuited and sized for a minimum of minus 15 degrees C 5 degrees F
subcooling and full pumpdown capacity. [Provide a coating as specified in
the paragraph entitled "Coatings for Finned Tube Coils." Coils to be
coated shall be part of the manufacturer's standard product for the
capacities and ratings indicated and specified. Fins shall be plate type.]
2.1.2.6
Fans
Statically and dynamically balanced. For V-belt drive fans, provide
adjustable sheaves. Provide fans with vibration isolation devices to
minimize vibration transmission.
2.1.2.7
Liquid Coolers (Evaporators)
**************************************************************************
NOTE: Insert winter design temperature that the
equipment will be subjected to.
**************************************************************************
Tubes shall be seamless copper. Refrigerant side design pressure shall
comply with ASHRAE 15. Water side design pressure shall not be less than
1034 kPa (gage) 150 psig. On direct-expansion units, each refrigerant
circuit shall be complete with liquid solenoid valve and expansion device
capable of modulating to minimum capacity. For the water side of liquid
cooler, the performance shall be based on a water velocity ranging from
0.91 to 3.66 m/s 3 to 12 fps with a fouling factor of 0.00025. Cooler
shall be provided with an electrical heating cable for freeze-up protection
to [____] degrees C degrees F ambient.
2.1.2.8
Controls, Control Panels, and Gages
**************************************************************************
NOTE: Specify required time delay for type and size
of unit after consulting current literature.
**************************************************************************
**************************************************************************
NOTE: Specify lowest percent of full capacity
required. Check for availability before inserting
number in blank.
**************************************************************************
**************************************************************************
NOTE: Insert winter design temperature that the
equipment will be subjected to.
**************************************************************************
Provide a control panel fitted with a discharge pressure gage, suction
pressure gage, separate high pressure cutout with manual reset, separate
low pressure cutout, low water temperature cutout with manual reset,
compressor operating control, and manual off-auto switch. Provide oil
pressure gage and low-oil-pressure cutout switch with manual reset for
chillers with positive displacement type oil pumps. Provide signal lights
or other visual "failed" indications for high pressure, low pressure, and
oil pressure protection devices. Multicompressor units shall be provided
with a lead/lag selector switch. Provide a timer to prevent compressors
from short cycling whenever stopped by safety controls. Time delay shall
be not less than [_____] minutes. A pumpdown cycle of the nonrecycling
start type shall be provided for each compressor 70 kW 20 tons or larger.
SECTION 15601N
Page 17
Previous Page
