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Operating Conditions
BAC cooling equipment is designed for the operating conditions
specified below, which must not be exceeded during operation.
Wind Load: For safe operation of unshielded equipment exposed to
wind speeds above 120 km/h installed at a height above 30 m from
the ground contact your local BAC-Balticare representative.
Standard electrical motors are suitable for an ambiant temperature
range from -25°C to +40°C.
CLOSED CIRCUIT COOLING TOWERS (VFL)
Design pressure : max. 16 bar
Fluid inlet temperature : max. 82°C
Fluid outlet temperature : min. 10°C
Fluids circulated through the inside of the coils must be compatible
with the coil construction material, ie.
- black steel, for hot dip galvanized coils
- stainless steel AISI 304L or 316L (options)
- galvanized steel for cleanable coil (option)
Maximum spray pressure : 14 kPa (If pump(s) are installed by
others, it is recommended to install a pressure gauge at the inlet of
the water distribution system.
EVAPORATIVE CONDENSERS (VCL)
Design pressure : 16 bar
Refrigerant inlet temperature : max. 120°C
Refrigerant outlet temperature : min. - 20°C
Suitable refrigerants : R-717, Halocarbon Refrigerants, HFC`s.
Standard condenser coils are manufactured from black steel and
hot dip galvanised after fabrication and may contain certain
contaminants, such as carbon, iron oxyde or welding particles. The
interior condition of the coil, including humid air must be
considered, when using halocarbon (or HFC) refrigerants and
sensitive system components, such as electronic expansion devices
or semi hermetic compressors. The installer must take the
necessary precautions on site to safeguard the operation of these
components in conjunction with the condenser coils.
Maximum spray pressure : 14 kPa (If pump(s) are installed by
others, it is recommended to install a pressure gauge at the inlet of
the water distribution system.)
At ambient temperatures above 40°C ensure spray water pump
remains running, even if condenser is idle. This prevents unwanted
discharge of refrigerant through safety valves (by others).
Note: Stand-by pump arrangements for evaporative fluid coolers and
condensers require alternating operation of each pump at least twice per
week to avoid stagnant water conditions and bacteriological growth.
Purge Requirements
The installer of BAC condensers must ensure proper system purging
of air prior to operation. Entrained air can obstruct free drainage of
refrigerant and reduce condensing capacity, resulting in higher
operating pressures than design. To verify absence of non
condensables in the system, follow the instructions of the BAC
Evaporative Condenser Manual E115.
Refrigerant connections on site :
All connections in the external refrigerant pipework (installed by
others) must be leak free and tested accordingly.
COOLING TOWERS (VTL)
Maximum inlet pressure : 0.5 bar
Water inlet temperature : max. 55°C (std. fill) or 65°C
temperature option)
For circulating water quality compatible with construction materials
refer to section 'WATER CARE' on page 4.
Note: Actual spray pressure is indicated on technical data sheet supplied with
order acknowledgement.
GENERAL INFORMATION
Connecting Pipework
All piping external to BAC cooling equipment must be supported
separately. In case the equipment is installed on vibration rails or
springs, the piping must contain compensators to eliminate
vibrations carried through the external pipework.
Safety Precautions
All electrical, mechanical and rotating machinery constitute a
potential hazard, particularly for those not familiar with its design,
construction and operation. Accordingly adequate safeguards
(including use of protective enclosures where necessary) should be
taken with this equipment both to safeguard the public (including
minors) from injury and to prevent damage to the equipment, its
associated system and the premises.
If there is doubt about safe and proper rigging, installation,
operation or maintenance procedures, contact the equipment
manufacturer or his representative for advise.
AUTHORIZED PERSONNEL
The operation, maintenance and repair of this equipment should be
undertaken only by personnel authorized and qualified to do so. All
such personnel should be thoroughly familiar with the equipment,
the associated systems and controls and the procedures set forth in
this and other relevant manuals. Proper care, procedures and tools
must be used in handling, lifting, installing, operating and repairing
this equipment to prevent personal injury and/or property damage.
MECHANICAL SAFETY
Depending upon site conditions it also may be necessary to install
items such as bottom air inlet screens, ladders, safety cages,
stairways, access platforms, handrails and toe boards for the safety
and convenience of the authorized service and maintenance
personnel. At no time this equipment should be operated without all
fan screens, access panels and access doors in place.
When the equipment is operated with a variable fan speed control
device, steps must be taken to avoid operating at or near to the
fan's «critical speed». For more information consult your local BAC
representative.
ELECTRICAL SAFETY
Each fan and pump motor associated with this equipment should be
installed with a lockable disconnect switch located within the sight
of the equipment. No service work should be performed on or near
the fans, motors, drives or inside the equipment unless fan and
pump motors, heaters etc. are electrically isolated.
LOCATION
All cooling equipment should be located as far away as possible
from occupied areas, open windows or air intakes to buildings.
LOCAL REGULATIONS
Installation and operation of cooling equipment may be subject of
local regulations, such as establishment of risk analysis. Ensure
regulatory requirements are consistently met.
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