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170.600-IOM (JUN 11)
Page 8
LIFTING LUG CAPACITY, LB/LUG
NOMINAL BEAM
MEMBER SIZE
W8
W10
BRINE / WATER SYSTEMS
For the most efficient operation of the unit, ensure a full flow
of either water or brine through the evaporator. Full flow is
achieved by using either of systems A or B in Figure 6.
1. Brine/water to/from PowerPac
2. Circulating pump
3. Brine/water to/from the system
4. Modulating 3-way valve
5. Buffer tank
Figure 6
A: Continuously Loaded System: The cooling media cir-
culates continually through the system and the evaporator.
B: System with load variations: (Example: air conditioning
system with several adjustable cabinets in which the cool-
ing media flow can be varied.) The modulating 3-way valve
will maintain a constant cooling media flow throughout the
evaporator. Installation of a buffer tank is recommended, as
shown in Position 5, Figure 6.
NOTE: Install vent valves (Position 1, Figure 6) at the
highest point in the system as well as at the drainage
valves (Position 2), which are located at the lowest point.
Connections and valves for chemical cleaning should be
installed. All cold piping should be insulated in order to
avoid condensation.
Water Treatment For Heat Exchangers
Often, brine and water for industrial refrigeration plants
contain impurities that can create a coating on the heat
conducting surfaces. This reduces the heat transmission.
In some cases, this coating can cause corrosion of the heat
conducting surfaces. Use a 12 mesh or finer filter for water
or brine in evaporator and condenser circuits.
This makes it important to monitor brine and water quality.
Consult a water expert concerning additives to the system
before installing the system.
Warranty does not include any damage that may occur
due to harmful impurities in the system.
CABLE ANGLE
VERTICAL
45°
15,200
14,990
19,400
14,990
™
FRICK
POWERPAC
®
™
INSTALLATION
Attention is drawn to the fact that all cooling towers experi-
ence a constant loss of water due to evaporation. This makes
impurities remain in the refrigeration system in an ever-
increasing concentration, also increasing their harmful effects.
Using a drainage system can minimize the concentration of
impurities. This drains off some of the polluted cooling tower
water and replaces it with fresh water.
This drainage system consists of a hand-operated adjusting
valve (Position 5, Figure 7), that is opened sufficiently to drain
the polluted cooling tower water to a treatment system. Fresh
water is provided through the float valve shown at Position 3.
1. Air in
2. Air out
3. Float valve
4. Pump
5. Adjusting valve with outlet to treatment system
6. Condenser
7. Overflow pipe
Figure 7
All electric wiring inside the PowerPac
nected at the factory on units ordered with solid-state,
package-mounted starters, or mounted variable frequency
drives.
External wiring connections that must be established once
the PowerPac
1. Mounting of main power supply cable to the control panel
2. Mounting of control line for starting of the condenser
pump
3. Mounting of control line for starting of the evaporator
pump
4. Mounting of flow switch, if any
5. Mounting of outside thermostat, if any
ELECTRIC WIRING
™
unit is installed are:
™
unit has been con-
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