Delfield F15 Series Specifications, Installation, Operation & Maintenance Manual page 14

Operation
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.
14
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 20.
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.
Section 4
Part Number: 9291460 01/20