140.925-IOM (APR 2019)
Page 19
XLP3 EVAPORATIVE CONDENSERS
OPERATION
•
Electric Water Level Control:
An electric water level
control will maintain the proper water level regardless of
the thermal load or variations in make-up water supply
pressure. The two-position, slow closing solenoid valve
provided with the Frick electric water level control package
also minimizes valve freezing problems (see page 28).
•
Heat Tracing:
Heat trace and insulate all exposed water
piping including pump piping below the overflow level and
make-up water lines with electrical heater tape.
NOTICE
For remote sump applications, the water level in the basin
of the equipment is a function of the design flow rate, the
quantity, size and location of the remote sump connection
and the pipe design between the cooling tower and the
remote sump. Units installed on remote sump applications
are supplied without a make-up connection.
COIL FREEZE PROTECTION
For protection against coil freeze-up, recommended solutions are
an industrial grade inhibited ethylene glycol or propylene glycol
solution. When the use of glycol is not practical, the system
must be designed to meet both minimum flow and minimum
temperature requirements.
Coil volumes for the XLP3 Evaporative Condenser using liquid
cooling circuits is job specific.
Minimum Operation
When utilizing an auxiliary cooling circuit with water as the
cooling media, the system must be operated to meet minimum
flow and temperature requirements. Maintain a minimum heat
load so that the temperature of the fluid leaving the coil is not
less than 50°F (10°C).
To maintain the leaving fluid temperature at 50°F (10°C) when
the process load is extremely light or shut off, apply an auxiliary
heat load to the circulating fluid and adjust the flow to ensure
that fluid leaving the coil maintains the minimum required tem-
perature. Otherwise, a glycol solution can be used as the cooling
media to prevent freezing.
OPERATION CONSIDERATIONS
FOR ACCESSORIES
Basin Heater (Optional)
One or more electric immersion heaters prevent the cold water
basin from completely freezing over and damaging the unit dur-
ing shutdown or standby. The heaters are sized for the specific
unit. The heating element has an enclosure that is suitable for
outdoor use. Annually, inspect the basin heater prior to the risk
of reaching freezing operating conditions.
Operation
Ensure that the heating element is completely submerged be-
fore energizing the main disconnect. For installations that have
a Frick Controls Enclosure, please consult the submittal packet
provided with the unit and contact your local Frick Representa-
tive for support. For installations that use a stand alone heater
control panel, see below.
NOTICE
The basin heater is not designed to prevent icing during
unit operation.
Stand Alone Frick Heater Control Panel (Optional)
The heater control system consists of a heater control panel
and a combination temperature/water level sensor. The stainless
steel sensor probe with 1/2” NPT mounting fitting has an on/off
relay output that de-energizes the heaters whenever the basin
water temperature is above 45°F (7.2°C), or whenever the sen-
sor probe is not fully submersed. The control panel enclosure is
suitable for outdoor use.
The control system utilizes a combination temperature/low
water level control sensor, which is powered by a transformer
in the control panel. When the sensor provides a signal to the
control panel, the panel sends a control voltage to the magnetic
contactors. When energized, the magnetic contactors supply
line voltage to the heaters. Annually inspect the heater control
system prior to the risk of reaching freezing operating conditions.
NOTICE
The heater control panel temperature/low level control can
only be used with the supplied combination temperature/
water level sensor probe. Please contact your local Frick
Representative for replacement parts.
Operation
Ensure that the element is completely submerged before ener-
gizing the main disconnect. The combination temperature/low
level control is preset to energize the heater at 40°F (4.5°C),
but will not energize if the water level is too low or if the water
temperature is above 45°F (7.2°C).
Testing the heater when water temperatures are above
45°F (7.2°C):
• Disconnect the heater control panel and tag out the circuit.
• Remove the heater control panel cover.
• Remove the sensor wires connected to terminals T1 and
T2 on the combination temperature/low level control and
isolate them.
Figure 18 - Basin Heater