Loading ...
Loading ...
Loading ...
Howard-McCray
A Division of HMC Enterprises, LLC.
831 East Cayuga Street •Philadelphia, PA 19124 USA •(215) 464-6800 •(800) 344-8222
Fax (215) 969-4890 •E-Mail: [email protected] 111118
5
Start-Up
1. Electrically energize the cabinet. Check the
supply voltage, must be within +/- 5%. Check the
evaporator fan motors to ensure all are operating
and rotating in the correct direction.
2. Electrically energize the refrigeration system.
Check the supply voltage, must be within +/- 5%.
3. Verify refrigeration system is operating
properly.
4. Verify proper Defrost operation (as outlined in
the Defrost section).
5. Verify the proper setting of the Crankcase
Pressure Valve (as outlined in the Crankcase
Pressure Valve section).
Controller Start-Up
: To display target set point; in programming
mode it selects a parameter or confirm an
operation.
(DEF) To start a manual defrost
(UP): To see the max. Stored temperature; in
programming mode it browses the parameter codes
or increases the displayed value.
(DOWN) To see the min stored temperature; in
programming mode it browses the parameter codes
or decreases the displayed value.
To switch the instrument off, if onF = oFF.
Not enabled.
KEY COMBINATIONS:
+
To lock & unlock the keyboard.
+ To enter in programming mode.
+ To return to the room temperature
display.
The controller has been programmed to delay
the compressor and fan motors for one minute. It
will take approximately 30 minutes for the
compressor to cycle, in a 75ºF room. The cabinet
will cycle between -5ºF to 0ºF.
If the alarm should go off during the pull-down
period just press the SET button on the
controller.
Alarm Program
The alarm is programmed to sound if the
temperature should reach a high of 15ºF or a low
of -25ºF by pressing the SET button on the
controller this will restart the unit until it reaches
the programmed temperature.
Individual Controller Parameters:
Cabinet Internal Temperature
= Cut-In-0ºF,Cut-Out-5ºF
Anti-Short cycle Delay [AC]
= 1 Minute Delay
Defrost Termination Temp[dtE]
= 50ºF Evaporator Coil Temperature
Between Defrost Periods [idF]
= 8 Hours
Maximum Time in Defrost [MdF]
= 30 Minutes
Alarm High Limit [ALU]
= 15ºF
Alarm Low Limit [ALL]
= -25ºF
Alarm Delay
+10 Minutes after Limit been reached
See chart in this manual for additional parameter
settings.
High Pressure Limit Control
The cabinet is equipped with a High Pressure
Limit Control. This control is for Safety purposes,
and SHOULD NOT BE ADJUSTED UNDER ANY
CIRCUMSTANCES.
Defrost Cycle
The cabinet goes into defrost every 8 hours from
the initial start up. If you want to set the defrost
period to start during closing hours simply push
the [MELTING SNOW FLAKE] key for more than 2
seconds and a manual defrost will start. Now the
next defrost will be approximately 8 hours from
that point. Defrost will terminate based on the
evaporator coil temperature. The sensor to
terminate defrost period is located on the inlet
line of the evaporator coil. When the coil
temperature reaches 50
o
F (10
o
C) the defrost
period will terminate. Remember the Defrost
Termination Temperature setting must be high
enough to allow the coil to completely clear itself
of frost and ice during the off cycle.
Loading ...
Loading ...
Loading ...