NATIONAL
SmartVapII
TM
REFRIGERATION
PROGRAM SPECIFICATIONS
AND OPERATING
INSTRUCTIONS
1085509
Defrost
Control System
Model: 1083700
Electrical Power: 115/1/60 - Air Defrost,
208-230/1/60 - Air & Electric Defrost
200-220/1/50 - Air & Electric Defrost
FEATURES:
· For use with 230V Single Phase Electric Defrost Evaporators
· Simple field hook up –Two Pipes-T wo Wires –It’s Done
· No wiring required to condensing unit / No field adjustments /set up
· Thermostat and defrost controls all factory set (-10°F freezer/ +39°F cooler)
· Simple user-friendly adjustments/ programming (if required)
· Available for Air Defrost (120 or 230V) +35°F Room and up applications
· User Lock Option (prevents unauthorized control adjustments)
CONTENTS
Operating Instructions ............................................................................................ 2 - 3
Wiring Diagrams ................................................................................................... 4 - 6
Troubleshooting Guide......................................................................................... 7 - 8
OPERATING INSTRUCTIONS
Electric Defrost Factory Settings:
The following are the factory default settings and
will suit most applications:
· Room Thermostat Cut-In Set Point :
-10°F for Freezer, and +39°F for cooler
· Defrost Frequency: 4 cycles per day with
maximum fail safe of 35 minutes.
· Defrost Termination set point : 55°F
· Fan Delay time set point: 3 minutes.
· User adjustments unlocked.
LED Display Indicators:
Dot illuminated
indicates
LOCKED
(CANNOT ADJUST)
MODE
(No illumination = normal
adjustment mode)
(Orange Lamp)
DEFROST MODE
(Green Lamp)
REFRIG RUN MODE
(T’stat calling)
Dot illuminated
indicates on
AIR DEFROST
MODE
(No illumination =
normal ED mode)
“Time” Button Functions
To view any of the “Time” button settings, just press and release in the following order.
To adjust settings, hold down “Time” button, while pushing “Up” or “Down” buttons.
Function Display Adjustment Factory Default
Shows: Range: Setting:
CLOCK actual time “23:59” 00:00 to 23:59 12:00
DEFROSTS per day “nd04” nd01 to nd12 nd04
FIRST DEFROST time “dEF01 / 9:00” 00:00 to 23:59 9:00
MAX DEFROST Duration Time “dEFd / 35” 15 mins* to 2 hours 35 mins
FAN DELAY “Fd-03” 01 to 06** minutes 03 mins
* Defrost cycle has a minimum 15 minute duration (unless reaches 75ºF on evaporator)
** CAUTION: long delay times can cause refrigerant flood back to the compressor
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“Temp” Button Functions
To view any of the “Temp” button settings, just press and release in the following order .
To adjust settings, hold down the “Temp” button while pushing “Up” or “Down” buttons.
Function Display Adjustment Factory Default
Shows: Range: Setting:
ROOM SET POINT cut-in temp. “SP / -10F” -40 to 99ºF -10ºF (Freezer)
+39ºF (Cooler)
ROOM set point differential “diF / 04F” 2 to 25ºF 4ºF
EV AP end plate temperature “EVAP” / actual ºF NA (reading only) N A
DEFROST termination temp. “dtº / 55ºF” 40 to 70ºF 55ºF
F-C Fahrenheit/Celsius “F” F or C F
“Man. Def” (Manual Defrost)
Button Function
Push and hold down (1 sec) to activate a manual
defrost cycle. To cancel at any time just push again
(hold for 1 sec). All regular timed defrost s will still
continue to be scheduled.
The defrost will not start if the evap end plate is
over 55°F (set point of termination temp).
During any defrost cycle the display will indicate the
room set point setting and will not display the actual
room temperature until 4 minutes after the defrost
has terminated.
User Lock Option
To prevent unauthorized personnel from tampering
with any settings, a locking function can be
enabled. This will allow any user to view the
settings but will prevent anyone from making
adjustments. The LED display will indicate LOC for
4 seconds during any attempt to adjust.
To activate the lock mode, hold down the “Temp”,
“Up” and “Down” buttons together for three
seconds.
To de-activate, wait for LOC (if displayed) to clear
from display, then follow the same procedure as
programming the lock mode.
Loss of Power
All previously programmed set points will be
retained in the program during the event of a power
loss. The clock time will re-start at the time setting
of when the power was lost (similar to mechanical
defrost clock) .
Air Defrost Application:
Ensure wiring has been modified according to the
air defrost diagram. Fans must stay on all the time.
For air defrost applications the room temperature
should be no colder than 35°F.
To program the control to Air Defrost mode push
the “UP” and “DOWN” button together. After 5
seconds “Ed” will appear in the display (continue
holding down buttons) after 5 more seconds “Ad”
will appear in the display at this point release both
buttons. A small LED dot will appear in the bottom
right hand corner of the display , indicating the
control is now programmed for air defrost mode.
Factory settings are: Room thermostat cut-in:
39°F. Defrost frequency: 3 cycles per day for 45
minute duration.
Troubleshooting Guide:
see pages 7 & 8.
Technical Assistance:
contact the factory at 1-800-463-9517
Note: the display will have a LED dot indicator on
the display when in locked mode (see “LED
Display” section)
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