Installation manual

When the refrigeration system first starts up, the room
temperature and the coil temperature are above 62°F(17°C).
The fan delay thermostat is open and the fans and anti-
condensate heaters remain off. The fan motors will come on
when the evaporator temperature is pulled down to
approximately 32°F (0°). This fan delay control cannot be
adjusted. If a single fan motor fails to start when the
thermostat is below 32°F (0°C), it may be an indication of a
defective fan motor. If all fan motors fail to start, it is an
indication of a defective fan delay control.
NOTE: ON SOME MODELS, THE EVAPORATOR FANS
TURN OFF WHEN THE DOORS ARE OPENED.
SYSTEM CONTROL/OPERATION
ELECTRONIC (PULSE)
Note: The “Pulse” information that follows pertains to set-up
and basic operation. For more comprehensive operation,
repair, and maintenance information refer to the Pulse
service manual part number 51-2484-00.
Display Settings
the freezer is shipped from the factory with a thermostat
setting of approximately the midpoint of the operating range.
Final thermostat setting must be made in the field.
The normal operating temperature ranges are:
0°F to -20°F (-17°C to -26°C) for freezer models;
0°F to -40°F (-17°C to -40°C) for low temp. freezer models;
and 5°F to 122°F (-15°C to -50°C) for incubator models
NOTE: DO NOT OPERATE THE CABINET WITH
THERMOSTAT SETTINGS BELOW:
-23°F (-30°C) ON FREEZERS;
-40°F (-40°C) ON LOW TEMP. FREEZERS;
Cabinet Temperature
& Defrost Management
These functions are controlled by a computerized control
board located in the electrical box behind the front grill. The
control board utilizes 3 inputs, a display board, and two
temperature sensors. The display allows the user to monitor
the change the cabinet temperature (located with-in the door
frame).
Cabinet Operation
When supply power is hooked up to cabinet and power
switch is turned on. The control board has a built-in 3 minute
delay on start up. The cabinet temperature display will read
the current cavity temperature. The cavity temperature set
point can now be set or checked by depressing lower right
button on the display board. The upper right button will raise
the cabinet temperature set point. this can be done with an
ordinary paper clip. the lower left button is a service interface
and only a qualified service technician should activate this
program. the evaporator fans should start up as the coil
reaches 28°F the cabinet temperature will continue to drop
until the cavity temperature set point is reached.
NOTE: Control board only breaks on side of supply voltage
to the compressor and defrost circuit.
Notable points
1. The system utilizes a 3 minute off cycle timer to prevent
short cycles.
2. When the system initiates a defrost, the setpoint will flash
on and off until the defrost is terminated and the cavity
reaches the setpoint. At this time the cavity temperature will
be displayed as normal.
Display Functions
NOTE: Use a paper clip to access the function keys.
1. Pressing the top right button on the display unit will raise
the set point one degree. Holding the button down will
scroll the adjustment.
2. Pressing the bottom right button on the display unit will
lower the set point one degree. Holding the button down
will scroll the adjustment. After an adjustment is made the
cavity temperature will automatically return to the display
after a brief moment.
3. When the system enters a defrost state, the set point will
flash on and off repeatedly on the display and continue to
flash until the defrost state is terminated and the cavity
temperature returns to the set point. At this time the cavity
temperature will be displayed as normal.
4. Touching any key on the display will acknowledge and turn
off the local audible alarm as well as the optional remote
alarm.
IMPORTANT: When the freezer is plugged in or anytime
power is disrupted and then restored, the system will
pull down to the set point, begin the cycle, and then
initiate a defrost in 3.2 hours from initial start-up.This is
normal and is part of the initialization mode for the
microcontroller to collect data from the system.
The Service Interface and the Service Menu
The service menu offers the service technician direct control
of the components of the system. This allows the technician
to force the system into a defrost state or the refrigeration
state. This feature also allows the technician to toggle the
state in order to analyze separate components of the system
(e.g., start kit, compressor, heaters, etc.).
1. To access the service menu, press and hold lower left
button on the display with a paper clip for 2 seconds. The
system will enter the service menu and c0 will alternately
flash with evaporator temperature. This is the top of the
service menu. to exit the service menu, press the service
key again at any time.
2. The service menu offers five functions: Refrigeration
state, Defrost state, code revision level indication, the
option to blank the display (code version 1.6 and later),
Service
Interface
Indicates Temp.
below 0°F
Setpoint up
Setpoint down
HANDLING & INSTALLATION 7