140.010-IOM (NOV 2019)
Page 26
IDSC EVAPORATIVE CONDENSERS
OPERATION
Figure 47: Bleed valve location
7.
Confirm an even water distribution over the plan area
of the condenser coil from the water spray nozzles.
8. For remote sump applications and where the water
distribution pump is not supplied by FRICK, install a
globe valve in the water pump discharge line. Adjust
the water flow rate between 6 psig and 8 psig at the
inlet of the supplied riser pipe to ensure sufficient wa
-
ter flow to all the water spray nozzles.
NOTICE
Refer to the submittal package for specific unit infor
-
mation.
After 24 hours of operation:
•
Check the water level in the cold water basin.
•
Adjust the water level control valve if required.
•
Check all water spray nozzles and confirm that each
has a uniform, full spray pattern over the condenser
coil.
Units which are subject to subfreezing climates must
be adequately protected to protect against damage and
reduced thermal performance. Mechanical (basin heaters)
and operational controls must be used, and correctly set
up, to prevent any freeze damage occurring to the unit.
COLD WEATHER OPERATION
The operation of evaporative cooled equipment at, or
close to, full load conditions prevents the recirculating
water from freezing. However, during periods of reduced
load and especially when pumps or fan motors are shut
down, freeze protection must be considered. When using
the IDSC evaporative cooling equipment in subfreezing
ambient conditions, conisder the following items:
•
Unobstructed unit location/layout. Recirculated air en
-
tering the cooler causes icing on the inlet louvers.
•
Protection against the water in the basin from freez
-
ing. Basin heaters are offered as an accessory. All cold
water
basin heaters are designed to maintain a water
temperature of 40°F (5°C) when the water distribution
pump and fan motors are shut down.
•
When the equipment is run dry, the cold water basin
must be drained, even if basin heaters are installed.
•
During dry operation, ensure that the drain line for the
basin is left open to prevent the accumulation of rain
water or snow.
•
All external water lines, the pump, and external water
distribution piping to the unit must be heat traced and
insulated when operating at subfreezing conditions.
Access the riser piping using removable profile covers.
•
The supply line for make-up water, overflow, and drain
lines must be heat traced and insulated.
•
All connections and accessories at or below the water
level must be heat traced and insulated, such as an
electronic water level controller.
•
For fluid coolers protection against the fluid from
freezing in the coil, consider the use of glycol or alter
-
nate antifreeze solutions.
–
These solutions, and the concentration thereof, have
an impact on the thermal performance of the cooler,
which must be considered when selecting the equip
-
ment.
•
Increase visual inspections and maintenance frequen
-
cies during subfreezing conditions.
•
Check all operating controls for freeze protection and
capacity control on a regular basis during subfreezing
operation.
A remote sump is the best form of protection for sub
-
freezing operating conditions to prevent freezing in the
cold water basin during subfreezing ambient conditions,
low load conditions, or when running dry. The remote
sump is located in an indoor heated environment and
when the pump is not running the cold water basin and
all associated water distribution piping free drains due to
gravity.
NOTICE
Note any instruction labels on the unit.
