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Marquee Display Usage (See Fig. 19 and
Tables 7-25) —
The Marquee display module provides the
user interface to the ComfortLink™ control system. The dis-
play has up and down arrow keys, an
ENTER
key. These keys are used to navigate through the dif-
ferent levels of the display structure. See Table 7. Press the
key until the display is blank to move through the
ESCAPE
top 11 mode levels indicated by LEDs on the left side of the
display.
Pressing the
and
ESCAPE
will scroll a clear language text description across the display
indicating the full meaning of each display acronym. Pressing
the
ESCAPE
and
ENTER
(Mode LED level) will return the Marquee display to its default
menu of rotating display items. In addition, the password will
be disabled requiring that it be entered again before changes
can be made to password protected items.
Clear language descriptions in English, Spanish, French, or
Portuguese can be displayed when properly configuring the
LANG variable in the Configuration mode, under DISP sub-
mode. See Table 16.
NOTE: When the LANG variable is changed to 1, 2, or 3, all
appropriate display expansions will immediately change to the
new language. No power-off or control reset is required when
reconfiguring languages.
When a specific item is located, the display will flash show-
ing the operator, the item, followed by the item value and then
followed by the item units (if any). Press the
stop the display at the item value. Items in the Configuration
and Service Test modes are password protected. The display
will flash PASS and WORD when required. Use the
and arrow keys to enter the 4 digits of the password. The de-
fault password is 1111. The password can only be changed
through CCN devices such as ComfortWORKS® and Service
Tool.
Changing item values or testing outputs is accomplished in
the same manner. Locate and display the desired item. Press
to stop the display at the item value. Press the
ENTER
key again so that the item value flashes. Use the ar-
ENTER
row keys to change the value or state of an item and press the
key to accept it. Press the
ENTER
item, value, or units display will resume. Repeat the process as
required for other items.
See Tables 7-25 for further details.
Service Test (See Table 9) —
control circuit power must be on.
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Alarm Status
Inputs
Outputs
ESCAPE
Configuration
Time Clock
Operating Modes
Alarms
Fig. 19 — Scrolling Marquee Display
key, and an
ESCAPE
keys simultaneously
ENTER
keys when the display is blank
key to
ENTER
ENTER
key and the
ESCAPE
Both main power and
ENTER
The Service Test function should be used to verify proper
operation of compressors, unloaders, hot gas bypass (if in-
stalled), cooler pump and remote alarm relays, EXVs and con-
denser fans. To use the Service Test mode, the Enable/Off/
Remote Contact switch must be in the OFF position. Use the
display keys and Table 9 to enter the mode and display TEST.
Press
twice so that OFF flashes. Enter the password if
ENTER
required. Use either arrow key to change the TEST value to the
On position and press
mote Contact switch to the Enable position (Version 2.3 and
later). Press
ESCAPE
or COMP sub-mode.
Test the condenser fan, cooler pump, and alarm relays by
changing the item values from OFF to ON. These discrete out-
puts are turned off if there is no keypad activity for 10 minutes.
Use arrow keys to select desired percentage when testing ex-
pansion valves. When testing compressors, the lead compres-
sor must be started first. All compressor outputs can be turned
on, but the control will limit the rate by staging one compressor
per minute. Compressor unloaders and hot gas bypass relays/
solenoids (if installed) can be tested with compressors on or
off. The relays under the COMP sub-mode will stay on for
10 minutes if there is no keypad activity. Compressors will stay
on until they are turned off by the operator. The Service Test
mode will remain enabled for as long as there is one or more
compressors running. All safeties are monitored during this test
and will turn a compressor, circuit or the machine off if re-
quired. Any other mode or sub-mode can be accessed, viewed,
or changed during the TEST mode. The MODE item (Run Sta-
tus mode under sub-mode VIEW) will display "0" as long as
the Service mode is enabled. The TEST sub-mode value must
be changed back to OFF before the chiller can be switched to
Enable or Remote contact for normal operation.
Configuring and Operating Dual Chiller Con-
trol (See Table 18) —
able for the control of two units supplying chilled fluid on a
common loop. This control is designed for a parallel fluid flow
arrangement only. One chiller must be configured as the master
chiller, the other as the slave chiller. An additional leaving fluid
temperature thermistor (Dual Chiller LWT) must be installed
as shown in Fig. 20 and connected to the master chiller. See
Field Wiring section for Dual Chiller LWT sensor wiring.
To configure the two chillers for operation, follow the ex-
ample shown in Table 18. The master chiller will be configured
with a slave chiller at address 6. Also in this example, the mas-
ter chiller will be configured to use Lead/Lag Balance to even
out the chiller runtimes weekly. The Lag Start Delay feature
will be set to 10 minutes. The master and slave chillers cannot
have the same CCN address (CCNA, Configuration mode un-
der OPT2). Both chillers must have the control method variable
(CTRL, Configuration mode under OPT2) set to '3.' In addi-
tion, the chillers must both be connected together on the same
CCN bus. Connections can be made to the CCN screw termi-
nals on TB3 in both chillers. The master chiller will determine
which chiller will be Lead and which will be Lag. The master
chiller controls the slave chiller by forcing the slave chiller's
CCN START/STOP variable (CHIL_S_S), control point
(CTPT) and demand limit (DEM_LIM).
The master chiller is now configured for dual chiller opera-
tion. To configure the slave chiller, only the LLEN and MSSL
variables need to be set. Enable the Lead/Lag chiller enable
variable (LLEN) as shown Table 18. Similarly, set the Master/
Slave Select variable (MSSL) to SLVE. The variables LLBL,
LLBD, an LLDY are not used by the slave chiller.
Refer to Field Wiring section on page 67 for wiring
information.
29
. Switch the Enable/Off/Re-
ENTER
and the
button to enter the OUTS
The dual chiller routine is avail-
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