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Once the unit is installed, follow the
steps below to ensure the installation
procedure is complete. When all are
accomplished, the unit is ready for
operation.
WARNING : More than one discon-
nect switch may be required to
de-energize unit for servicing. Refer to
unit schematic and open all electrical
disconnects to prevent injury or death
due to electrical shock.
1. Inspect all wiring connections;
electrical connections should be
clean and tight.
WARNING : Use extreme care
when electrically troubleshooting
compressors. If electrical power is
applied to a damaged fusite terminal,
a fire or explosion could occur,
resulting in injury or death.
CAUTION : Check tightness of all
connections in the compressor power
circuit (disconnects, terminal block,
contactors, compressor junction box
terminals, etc.) to prevent overheating
at connections and under voltage
conditions at the motor.
2. Check power supply voltage to
the unit at the main power fused
disconnect switch; the voltage
reading should be within the
utilization range shown in Table 2
on page 9. Also, Voltage imbalance
must not exceed 2%. (Refer to item
10 Unit voltage and amperage
checks )
3. Check the condenser fan
assemblies; the fan blades should
rotate freely in the fan orifice, and
be securely attached to the fan
shaft.
12
Pre-Start Procedure
4. Fill the chilled water circuit, leaving
the system air vents open. Close
vent after filling.
5. Start the chilled water pump. With
water circulating through the chilled
water system, inspect all piping
connections for leaks and make
any necessary repairs.
6. Adjust the water flow rate through
the chilled water circuit, and check
the water pressure drop through
the evaporator. Refer to water
pressure drop data on page 8.
7. Ensure flow switch is installed and
wired to the control panel. Adjust
the flow switch to provide proper
operation.
NOTE : Withe the water pump
operating, throttle the water flow to
approximately 50 percent of the full
flow rate. Following the manufacturer's
instruction adjust the flow switch
contacts to open at this point. Use
an Ohmmeter to verify opening and
closure of the switch contacts.
8. Stop the chilled water pump.
9. Open all fused disconnect
switches.
WARNING : Use extreme care when
checking voltage at live terminals to
avoid serious injury or death due to
electrical shock.
10. Unit Voltage and Amperage
Checks Voltage supply
Measure each leg of supply voltage
(3-phase) at all ling voltage disconnect
switches. Readings must fall within
the voltage utilization range shown on
the unit nameplate.
Voltage Imbalance
Excessive voltage imbalance between
phase will cause motors to overheat
and eventually fail. Maximum allow-
able imbalance is 2%
% Voltage Imbalance = 100 x [V
where VA is the average voltage and
VD is the ling voltage that deviates
farthest from VA
11. Establish a balanced water flow
through the evaporator.
12. Measure the water pressure drop
through the evaporator at the
pressure gauge(s) on the system
water piping. Pressure drop
readings at the gauges should
approximate those indicated by
the pressure drop charts (figure 2)
on page 8
NOTE : Be sure to account for piping/
fittings that will create additional
pressure drop between the unit and
the pressure gauge locations.
CGAT-IOM01-EN
-V
]
A
D
VA
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