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available to the chiller module via an interprocessor
communications link This module also provides output
contact closures for control devices.
1U4_ Purge Module
The purge module manages the purge system logic. In
auto mode, the module monitors a sensor located on the
condensing unit suction line to determine when pumpout
is required. A module output then turns on the pumpout
cycle. The pumpout cycle data is monitored and stored.
This information is available from the clear language
display (CLD).
1U5 Stepper Module (standard)
The stepper module 1U3 receives input from unit sensors
and binary input devices. This information is provided to
other modules as needed on the IPC link. The stepper
output is used to control the hot water valve when the
heating option is specified and the energy value for steam
or hot water indirect fired units.
1U6 Local Clear Language Display (LCLD, or
Operator Interface)
The LCLD is mounted on the control panel door. The
module has connecting wiring accessible on the door
backside. The LCLD is used to communicate with the chiller
module in order to change various machine-operating
parameters and monitor machine data. See the operator
interface for complete details.
1U7 Options Module
When optional functions are specified that required
additional input or outputs (I/O) option modules are used.
Some of these options are standalone, such as Generic
BAS interface; other options support other additions to the
chiller control. Features supported by the options module
are external chilled water and hot water setpoint and other
hot water simultaneous heating requirements.
1U8, 9,10 Optional External Communications Modules
• IPC Buffer Module - Used to communicate to
external devices.
• Printer Communications Interface - required for
printer compatibility.
The printer interface module provides a pre-
formatted chiller log to a printer. The printer
interface can be programmed via the LCLD to
print a chiller log on command, at the time of a
diagnostic, and/or on a periodic basis.
• Tracer Communications Interface Module -
Required for Tracer compatibility.
Comm 4 are an optional module that provides
a 9600-baud non-isolated communications link
to SUMMIT. Comm 3 is an optional module
that provides a 1200 baud isolated
communications link to TRACER 100.
3U3 Burner Module (ABDA only)
The burner module serves as an interface to the burner and
flame safeguard control. Some of these functions include
burner start, reset, and fuel select, alarm feedback, and
combustion confirmation and provides an interface for
burner firing rate modulation output. The burner module
also houses the simultaneous heating water control
algorithms providing control output for the heating system
water valve located on the optional auxiliary heat
exchanger. The burner module has other input or output
(I/O) capabilities used to support I/O expansion.
Terminal Blocks
Terminal blocks are utilized for various connection points
within the control panel as identified below.
• 1TB1 Main power terminal block (standard).
• 1TB2 Pump Motor Terminal Block - Line voltage
distribution point for the three phase solution pump
motors.
• 1TB3 Control Panel Mounted Terminal Strip - Provides
termination points for internal wiring, and also for field
wiring interface points. See the electrical connection
points on the typical unit schematics.
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