4
instead of the local display. The CCN tables are located in
Appendix B of this manual.
BASIC CONTROL USAGE
ComfortLink™ Controls — The ComfortLink con-
trols are a comprehensive unit-management system. The con-
trol system is easy to access, configure, diagnose and trouble-
shoot.
The controls are flexible, providing two types of constant
volume cooling control sequences, two variable air volume
cooling control sequences, and heating control sequences for
two-stage electric and gas systems, for multiple-stage gas heat-
ing, and hydronic heat in both Occupied and Unoccupied
schedule modes. This control also manages:
• VAV duct pressure (through optional VFD or inlet guide
vanes), with reset
• Building pressure through four different power exhaust
systems
• Return fan applications using fan tracking
• Condenser fan cycling for low ambient head pressure
control
• Dehumidification (with reheat) and humidifier sequences
• Space ventilation control, in Occupied and Unoccupied
periods, using CO2 sensors or external signals, with ven-
tilation defined by damper position or ventilation airflow
measurement
• Smoke control functions
• Occupancy schedules
• Occupancy or start/stop sequences based on third party
signals
• Alarm status and history and run time data
• Management of a complete unit service test sequence
System diagnostics are enhanced by the use of multiple
external sensors for air temperatures, air pressures and refriger-
ant pressures. Unit-mounted actuators provide digital feedback
data to the unit control.
The ComfortLink™ controller is fully communicating and
cable-ready for connection to the Carrier Comfort Network®
(CCN) building management system. The control provides
high-speed communications for remote monitoring via the
Internet. Multiple 48/50Z Series units can be linked together
(and to other ComfortLink controller equipped units) using a
3-wire communication bus.
The ComfortLink control system is easy to access through
the use of a unit-mounted display module. There is no need to
bring a separate computer to this unit for start-up. Access to
control menus is simplified by the ability to quickly select from
11 menus. A scrolling readout provides detailed explanations
of control information. Only four, large, easy-to-use buttons are
required to maneuver through the entire controls menu. The
display readout is designed to be visible even in bright sunlight.
For added service flexibility, an accessory hand-held
Navigator™ module is also available. This portable device has
an extended communication cable that can be plugged into the
unit’s communication network either at the main control box or
at the opposite end of the unit, at a remote modular plug. The
Navigator display provides the same menu structure, control
access and display data as is available at the unit-mounted
scrolling marquee display.
Scrolling Marquee — This device is the keypad inter-
face used to access the control information, read sensor values,
and test the unit. The scrolling marquee is located in the main
control box and is standard on all units. The scrolling marquee
display is a 4-key, 4-character, 16-segment LED (light-emitting
diode) display module. The display also contains an Alarm Sta-
tus LED. See Fig. 1. The display is easy to operate using
4 buttons and a group of 11 LEDs that indicate the following
menu structures:
• Run Status
• Service Test
• Temperatures
• Pressures
• Set points
• Inputs
• Outputs
• Configuration
• Timeclock
• Operating Modes
•Alarms
Through the scrolling marquee, the user can access all of the
inputs and outputs to check on their values and status, config-
ure operating parameters plus evaluate the current decision sta-
tus for operating modes. Because the 48/50Z Series units are
equipped with suction pressure and discharge pressure trans-
ducers, the scrolling marquee can also display refrigerant
circuit pressures typically obtained from service gages. The
control also includes an alarm history which can be accessed
from the display. In addition, through the scrolling marquee,
the user can access a built-in test routine that can be used at
start-up commissioning and to diagnose operational problems
with the unit.
Accessory Navigator™ Display — The accessory
hand-held Navigator display can be used with the 48/50Z
Series units. See Fig. 2. The Navigator display operates the
same way as the scrolling marquee device. The Navigator
display is plugged into the RJ-11 jack in the main control box
on the COMM board. The Navigator display can also be
plugged into the RJ-11 jack located on the unit corner post
located at the economizer end of the unit.
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ENTER
MODE
ESCAPE
Fig. 1 — Scrolling Marquee
Run Status
Service Test
Temperatures
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
ENTER
ESC
MODE
Alarm Status
TIME
EWT
LWT
SETP
12.58
54.6F
44.1 F
44.0F
NAVIGATOR
ComfortLink
Fig. 2 — Accessory Navigator Display