16
Part Number: 9291460 11/17
Operation
Section 3
115Volt Power Switch
F5 power switch is located next to the condensing unit.
Turn the switch ON to begin operation.
F15 displays cases have one power switch. It is located
behind the louvered panel in the mechanical compartment.
Turn the switch ON to begin operation.
F15 Power Switch On Top of Base Temperature Control
115Volt Light Switch
The lights are controlled by a 3 position switch. The switch is
located in the display nosing under the display thermostat.
It has the following positions and functions:
• Top position – Motion – the lights will function
according to the motion sensors. This is the factory
recommended setting.
• Middle position – Off – the light will be off.
• Bottom position – On – the lights will be on.
115Volt Temperature Controls
The F5 and F15 display case temperature control is located
in the display nosing.
F5 & F15 Display Temperature Control
F15 display cases have two temperature controls. The
base temperature control in located in the mechanical
compartment.
F15 Base Temperature Control
Display cases are factory set at mid-range to maintain about
38ºF (3ºC) box temperature.
1. At initial start-up or anytime power is disconnected,
then reconnected to the unit, the control will go into
defrost mode.
2. The control will enter a DEFROST mode and the display
will read dEF. The compressor and condenser fan as
well as the evaporator fan will remain off until this
initial defrost is complete. This initial defrost cycle may
take up to 35 minutes to complete.
3. The display will continue to read dEF for an additional
30 minutes while the cooling cycle cools the box to the
set temperature.
4. Then the digital thermostat will display box
temperature.
5. The temperature control will cycle the compressor,
evaporator fan motor and condenser fan motor to
maintain box temperature at the control setting. For
more information see Evaporator Fan Operation on
page 18.
Defrost
The temperature control also monitors the evaporator
temperature and will turn off the compressor and
condenser fan motor when needed to allow accumulated
frost on the evaporator to clear. During this defrost cycle,
the digital temperature display will read dEF. After the
defrost cycle is complete, the temperature control will
return to a normal cooling cycle, but the display will
continue to read dEF until the evaporator returns to normal
cooling temperatures (up to 30 minutes).
The electronic temperature controller monitors evaporator
temperature and compressor run time to determine the
proper time for a positive defrost cycle. A defrost cycle
can occur as often as every 60 minutes under extremely
heavy usage. When the controller enters the defrost mode
the compressor is shut off and will remain off until the
evaporator coil temperature exceeds 41°F or the controller
reaches a time limit of 75 minutes. The defrost cycle can last
from a minimum of 2 minutes to a maximum of 75 minutes.
