FORM 201.19-CL2 (309)
2
JOHNSON CONTROLS
Grounding
Verify that the unit’s protective terminal(s) are properly
connected to a suitable grounding point. Ensure that all
unit internal ground connections are tight.
Overloads
Ensure that the fan overloads settings are correct for the
type of fan fitted.
Supply Voltage
Verify that the site voltage supply corresponds to the
unit requirement and is within limits.
Reference the
Technical Data Section in the IOM.
Control Transformer
The 3-wire control transformer is mounted external to
the panel. It is important to check that the correct primary
tapping has been used:
With the supply voltage to the unit turned off, remove
the lid to the transformer box.
Check that the tapping used conforms to the site supply
voltage. After the tapping is verified, replace the lid.
Switch Settings
Ensure that the unit ON/OFF switch on the display door
and the micro board system switches S2 through S5 are
set to “0” (OFF). Set the red handled emergency stop
device on the options panel to “1” (ON). For units fitted
with door interlocked circuit breakers the power panel
doors must be closed and the devices set to “1” (ON).
The customer’s power disconnection devices can now
be set to ON.
The machine is now live!
The unit is fitted with an under voltage circuit in each
panel and it may take between 5 to 10 seconds for its
contacts to close and energize the unit’s electronics,
including the display on the main panel.
Compressor Heaters
Verify the compressor heaters are energized. If
the ambient temperature is above 96°F (36°C) the
compressor heaters must be on for at least 8 hours before
start-up to ensure all refrigerant liquid is driven out of
the compressor. If the ambient temperature is below
86°F (30°C) then allow 24 hours.
Water System
Verify that the chilled liquid system has been installed
correctly, and has been commissioned with the correct
direction of water flow through the evaporator. The inlet
should be at the refrigerant pipework connection end of
the evaporator. Purge air from the top of the evaporator
using the plugged air vent mounted on the top of the
evaporator body. Flow rates and pressure drops must
be within the limits given in the Technical Data Section.
Operation outside of these limits is undesirable and could
cause damage.
Flow Switch
Verify a chilled water flow switch is correctly fitted in
the customer’s pipework on the evaporator outlet, and
wired into the control panel correctly using shielded
cable. There should be a straight run of at least 5 pipe
diameters on either side of the flow switch. The flow
switch should be connected to terminals 13 and 14 in
the micro panel.
Temperature Sensor(s)
Ensure the leaving liquid temperature sensor is coated
with heat conductive compound (part no. 013-00890-
000) and is inserted in the water outlet sensor pocket
of the evaporator. This sensor also acts as the freeze
protection thermostat sensor and must always be in the
water OUTLET sensor pocket.
Control Supply
Verify the control panel display is illuminated.
Programmed Options
Verify that the options factory programmed into the
Microcomputer Control Center are in accordance with
the customer’s order requirements by pressing the
“
Op-
tions
”
key on the keypad and reading the settings from
the display.
