Sub-Zero Mega Chill User Manual

6
7
Liquid Crystal Display (LCD)
The LCD screen shows description
of the controller parameters, and
any other information concerning
the controlled variables.
Display 2 rows X 16 characters.
Character Size 5.56 X 2.96 mm.
Liquid Crystal Display (LCD)
Light Emitting Diodes (LED)
There are 23 LED indications on
the chiller front panel indicating :
Phases - all 3 phases are
displayed as RYB.
Faults - Red blinking LED
ALERT Indicates that there is a
fault.
Individual device fault - Red
LED indicates that there is a
fault in that particular device.
Device OK status - Green LED
indicates that the device is OK.
Device is inactive - Blank LED
indicates that the device is
inactive.
COMPRESSOR 2 ON
MED. LIQUID LEVEL
Light Emitting Diodes (LED)
3.2 Input/Output Board
The Relay board represents the
core of the system, where the
signals coming from the probes,
digital inputs etc. are processed.
On this board you can locate :
1. Terminals for power source-
10Vac (yellow) & 9 Vac (red).
2. Liquid level sensor inputs
(Level Sensors).
3. Analog inputs (sensors).
4. Digital Inputs (alarms).
5. Digital outputs (relay).
6. Telephone connector for user
interface connection.
Input/ Output
2 COMPRESSOR2 COMPRESSOR

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