Reymsa HFC Series - Basin Heater Operation; Coil Freezing Protection; Pump Freezing Protection; Remote Sump Operation

REYMSA COOLING TOWERS, INC.
www.reymsa.com
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In Double Fan cooling towers (per cell), ensure to Start-Stop the fan motors at the same time. If
you need more information, please contact REYMSA.
WARNING
C.5.3. COIL FREEZING PROTECTION
The method recommended to protect the copper coil from freezing-up is to use an ethylene glycol solution
inside the coil, if an anti-freeze solution is not used, the coil must be drained immediately if the ow stops.
The recommended Solution freezing protection temperature is showed in the table below.
ETHYLENE GLYCOL (by volume)
FREEZE
POINT
20% 30% 40% 50%
°F 14 3 -14 -38
°C -10 -16 -26 -39
Table C-5: Recommended solution freezing protection temperature
If the minimum uid ows cannot be maintained or an anti freeze solution is not in the coil it needs to be
drained as soon as possible if the pumps are shut down or lack of ows during freezing conditions. This is
accomplished by having automatic drain valves and air vents in the piping to and from the cooler. Care must
be taken to ensure that the piping is insolated to allow water to ow from the coil. This method of protection
should be used only in emergency situations, and is neither a practical not recommended freeze protection
method. Coils should not be drained for an extended period of time.
C.5.4. PUMP FREEZING PROTECTION
If freezing conditions exist for a long period of time, during shut down the pump must be completely drained
and blow out of all liquid, from pump passages, casing, and pockets, using compressed air.
C.5.1. BASIN HEATER OPERATION
REYMSA recommends the use of an Immersion Heater System in the Tower basin, designed to provide freeze
protection. Such system consists on heating element (3-12 kW), control panel, temperature and level sensors
(refer to section “A.2.8.3. BASIN HEATER”).
▪ Visually check that the water level is above sensor electrode. The heater element should be covered with
at least 2” of uid, while heater is energized.
▪ The heater will energize if the temperature of the basin water falls below the thermostat set point and
the water level is above the sensor level.
C.5.2. REMOTE SUMP OPERATION
A remote sump tank located in an indoor heated building is a simple option of freeze protection. When the
Tower shuts down, the water is drained into the remote sump tank which is in a heated atmosphere.
Operation
Immersion heater should be covered with at least 2” of uid, while heater is energized
to prevent any failure by overheating
WARNING