22
1T4 Line Voltage Transformer
Transformer that steps down line voltage to 115Vac control
powered circuits.
1T5 - Control Voltage Transformer
Transformer that steps down the 115Vac control voltage to
24Vac power.
1T6, 1T7, 1T8 Under-Over Phase Voltage Transformer
(Optional)
Voltage potential transformers provide an isolated
secondary voltage that is a proportional representation of
the primary voltage. Each line voltage of the three-phase
supply to the unit control panel is sensed. Each potential
transformer’s low voltage output is input to the 1U5 starter
module.
Contactors
Contactors are used to control the line voltage supplied to
the pump motors
• 1K11 - Refrigerant pump contactor
• 1K12 - High temperature solution pump contactor
Table 4 - Current gain settings as a function of CT factor for UCP2 starter
module
CT Factor Current Gain Setting
66 00
67 01
68 02
69 03
70 04
71 06
72 07
73 08
74 09
75 10
76 11
77 12
78 13
79 15
80 15
81 16
82 17
83 18
84 19
85 20
86 21
87 22
88 22
89 23
90 24
91 25
92 25
93 26
94 27
95 28
96 28
97 29
98 30
99 30
100 31
(5) Using the Control Panel
Figure 6. Operator interface (Local Clear Language Display - LCLD)
Unit is Running
Custom
Report
Chiller
Report
Cycle
Report
Pump or
Purge Report
Operator
Settings
Service
Settings
Service
Tests
Diagnostics
Previous
Next
Enter
Cancel
Auto
Stop
+
–
The operator interface or local clear language display
(LCLD) is used to communicate with the chiller. The
machine operator can select information displayed from
group menus that have predetermined information. All
operator selected and monitored information is entered
and displayed from this device. The operator interface
obtains the selected setup values and data from the
interprocessor communications (IPC) link. The settings and
temperatures will not be displayed until they have been
read via the IPC. Displayed items, such as temperature, will
be updated every two seconds. Service mode menus
provide machine setup, service tests, and manual control
operation. The LCLD has four operator report menus and
four select settings group menus. A detailed description of
menu use and function follows later in this section.
Display
Figure 6 illustrates the operator Interface which has a two-
line, forty-character display, an alarm indicator (LED), and a
keypad for the selection of specific chiller information. The
display has backlighting for legibility in low light conditions.
The backlight is also used to maintain the operating
temperature of the display. During low ambient
temperature periods the backlight will illuminate.
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