Sub-Zero Mega Chill User Manual

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2. INTRODUCTION
The “MEGA CHILL-2COMP” is a
two compressor chiller controller .
This integrates all the required
functions of the chiller.
It is very user friendly due to the
LCD provided which gives all the
parameters, messages, alarms
etc on the display. In addition to
the LCD there are LED's provided
for instant status on all controls in
the system.
2.1 Main Features
The Mega Chill controller allows
you to manage refrigeration units
having different configurations.
WATER condensation.
AIR condensation.
System’s Functions:
The system controls and regulates
the following conditions :
Water temperature
according to the user’s
location of the sensor.
Protection of the
compressor with indication
of any possible fault.
Display of Chiller status on
temperature on
LCD and
LED display.
Regulates level of water via
a water solenoid valve.
2.2 Hardware Description
The basic system comprises of
Mega Chill User interface
Input / Output board
Mega chill is the intelligent part
of the system. It also represents
the ‘user interface’ for an easy
communication between user and
the controller.
3.1 Mega Chill User Interface
Mega Chill User Interface is a user friendly board which integrates all
controller keys, display LCD and display LEDs.
3. Hardware
COMPRESSOR2 ON
MED. LIQUID LEVEL
2 COMPRESSOR2 COMPRESSOR
29.5
COMPRESSOR2 ON
MED. LIQUID LEVEL
29.5

Sub-Zero Mega Chill Specifications

Operating Environment

operating temperature	-50 C to +50 C0
storage temperature	-20 C to + 70 C
operating humidity	Max 80% (non-condensing)
storage humidity	Max 80% (non-condensing)

Power

max continuous input voltage	230 Vac
input current (closed contact)	10 mA
transformer primary input	230Vac, 50Hz
transformer secondary output 1	9Vac, 350mA
transformer secondary output 2	10Vac, 500mA

Digital Output (Relay)

type	SPDT
contacts	C & NO (C, No, NC for compressor)
rating	250 Vac, 5A(resi)

Analog Inputs

sensor type	Japanese NTC thermistors
specification	10K @ 25 C0
resolution	0.5 C0
accuracy	+/- 1 C0