10
CHS-SVN011C-EN
Modes of Operation
(F0) Units
CAUTION
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
CAUTION
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
1. “Power” - Power sequence of operation
a. Field power leads are connected to terminals L1-L2-
L3 on the input side of the main circuit breaker.
b. Closing the main disconnect switch powers the unit
fan motor, heater, and control circuits. The green
“Power” light will turn on. This indicates that 115V
power is being provided to the control circuit.
c. Opening the main disconnect removes power from
the unit. The “Power” light turns off.
d. The “on-off” switch must be in “on” position for
refrigeration and defrost modes. The “on-off”
switch will not affect the “power” or “rotation”
modes. The “on-off” switch does not disconnect
power.
2. “Rotation” - Fan rotation and phase loss monitor
sequence of operation
WARNING
Rotating Components!
During installation, testing, servicing and
troubleshooting of this product it may be necessary to
work with live and exposed rotating components. Have
a qualified or licensed service individual who has been
properly trained in handling exposed rotating
components, perform these tasks. Failure to follow all
safety precautions could result in rotating components
cutting and slashing technician which could result in
death or serious injury.
WARNING
Rotating Components!
The following procedure involves working with rotating
components. Disconnect all electric power, including
remote disconnects before servicing. Follow proper
lockout/ tagout procedures to ensure the power can
not be inadvertently energized. Secure drive sheaves to
ensure rotor cannot freewheel. Failure to secure drive
sheaves or disconnect power before servicing could
result in rotating components cutting and slashing
technician which could result in death or serious injury.
a. Field power leads L1-L2-L3 provide power to L1-L2-
L3 on the Phase Monitor.
b. The Phase Monitor checks the incoming power
supply for proper phase and voltage. The unit will
not operate unless all three phases are present, and
in the proper phase.
c. Place unit in operating mode by closing the main
disconnect switch. Observe the “Rotation” light. If
the “Rotation” light is on, the power supply phases
are out of sequence and the fan motor will run
backwards. Close the main disconnect switch and
reverse any two incoming power leads (for
example, wire field lead L1 to terminal L2, and field
lead L2 to terminal L1).
d. If reversing the leads as described before fails to
turn off the “Rotation” light, then there is a loss of
phase or voltage imbalance between legs. Reset the
main circuit breaker.
e. Check the 15 amp Phase Monitor fuses, and replace
as necessary. If the “Rotation” light is still on at
power up, then there is a problem with the field
power supply and must be corrected.
f. If the “Power” light is on, and the “Rotation” light
is off, the unit is powered and the fan rotation is
correct.
