Installation, Operation and Maintenance 5 - 3
water temperatures, evaporator and condenser
water pump control, and general status and alarm
relays. Other machine inputs and outputs include
compressor load and unload pulse outputs, oil return
pump control and oil lubrication system control and
flow protection.
Stepper Module - 1U3
The stepper module is designed to drive the stepper
motor electronic expansion valve. The stepper
module uses liquid level inputs and stepper motor
outputs to run the algorithm to control liquid level in
the evaporator. The output of the control algorithm
drives the electronic expansion valve. Other module
I/O capabilities support general machine protection
and control, including evaporator and condenser
refrigerant temperatures.
Starter Module - 1U2
The starter module provides control of the starter
when starting, running and stopping the motor. The
starter module provides interface to, and control of,
Y-Delta and solid state starters. The starter module
also provides protection to both the motor and the
compressor such as running overload, phase
reversal, phase loss, phase unbalance and
momentary power loss.
Options Module - 1U5
The options module satisfies control or interface
requirements for a number of options. Some of these
options are standalone such as generic BAS
interface. Other options support either additions or
modifications to the chiller itself. Some features
supported by the options module are ice making,
external chilled water setpoint and external current
limit setpoint.
COMM 3 or COMM 4 (Tracer Interface)-
1U6
Two communication modules are available for
various communication functions. One available
option provides a 9600 baud non-isolated link to
Tracer Summit (Comm 4) and another can provide a
similar, but isolated, communications link to existing
Tracer 100 systems (Comm 3).
Printer Interface Module - 1U7
The printer interface module provides a pre-
formatted chiller log to the printer. The printer
interface can be programed, via the Clear Language
Display, to print a chiller log on command at the time
of a diagnostic or on a periodic basis.
Clear Language Display (CLD) - 1U4
The local Clear Language Display is mounted on the
control panel door and displays chiller data and gives
access to operation/service controls, set points and
chiller setup information or configuration. All
setpoints and other settings are stored in non-volatile
memory in the chiller module. The interface is
programmed with a variety of languages.The display
on the Clear Language Display is a two-line, 40
character liquid crystal. The display has a backlight
so that it can be read in low light conditions.
In addition to the alpha-numeric liquid crystal display,
a red “alarm” LED is installed that flashes ON-OFF
whenever a latching diagnostic (requiring manual
reset) is present. The red LED is also used to
indicate that a function or control has been set to
manual from within the service test menu for a
maintenance task such as oil line charging. If a
control has been set to manual, the LED is ON
continuously. If a diagnostic is active while some
function is in a manual mode, the LED will flash ON-
OFF. Diagnostic displays and resetting procedures
are discussed in Section 10.
A membrane keypad is used on the unit-mounted
operator interface. The keypad is sealed, making it
weather-proof and dirt-proof. The keypad has 16
keys arranged in a 4-by-4 matrix as shown in
Figure 30
.
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