Table of Contents
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BASIC CONTROL USAGE
ComfortLink Controls
The ComfortLink controls are a comprehensive unit-management
system. The control system is easy to access, configure, diagnose,
and troubleshoot.
The controls are flexible, providing constant volume and variable
air volume cooling control sequences, and heating control se-
quences for two-stage electric and gas systems, multiple-stage gas
heating, and hydronic heat in both Occupied and Unoccupied
schedule modes. This control also manages:
•
VAV duct pressure (through optional VFD), with configu-
rable static pressure reset.
•
Building pressure through four different power exhaust
schemes.
•
Return fan applications using fan tracking.
•
Condenser fan head pressure control.
•
Dehumidification (with optional reheat) and humidifier
sequences.
•
Space ventilation control, in Occupied and Unoccupied pe-
riods, using CO
sensors or external signals, with ventila-
2
tion 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.
•
Economizer operation and Fault Detection and Diagnos-
tics (FDD) per California Energy Commission (CEC)
Title 24-2013.
System diagnostics are enhanced by the use of sensors for air tem-
peratures, air pressures, and refrigerant 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 CCN building management system.
The control provides high-speed communications for remote
monitoring. Multiple 48/50P 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. A computer is not needed
to perform unit start-up. Access to control menus is simplified
by the ability to quickly select from 11 menus. A scrolling read-
out 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 commu-
nication 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 interface used to access the control in-
formation, read sensor values, and test the unit. The scrolling mar-
quee 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 con-
tains an Alarm Status LED. See Fig. 1. The display is easy to oper-
ate using 4 buttons and a group of 11 LEDs that indicate the fol-
lowing menu structures: Run Status, Service Test, Temperatures,
Pressures, Set points, Inputs, Outputs, Configuration, Timeclock,
Operating Modes, and Alarms.
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Alarm Status
Inputs
Outputs
ESCAPE
Configuration
Time Clock
Operating Modes
Alarms
Fig. 1 — Scrolling Marquee
Through the scrolling marquee, the user can access all of the in-
puts and outputs to check on their values and status, configure
operating parameters, and evaluate the current decision status for
operating modes. Because the 48/50P Series units are equipped
with suction pressure and discharge pressure transducers, the
scrolling marquee can also display refrigerant circuit pressures
typically obtained from service gauges. The control also in-
cludes 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
48/50P Series units. See Fig. 2. The Navigator display operates in
the same way as the scrolling marquee device. The Navigator dis-
play 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 economiz-
er end of the unit.
Fig. 2 — Accessory Navigator Display
Operation
All units are shipped from the factory with the scrolling marquee
display, which is located in the main control box. See Fig. 1. In ad-
dition, the ComfortLink controls also support the use of the hand-
held Navigator™ display.
Both displays provide the user with an interface to the
ComfortLink control system. The displays have
row keys, an
ESCAPE
used to navigate through the different levels of the display struc-
ture. The Navigator and the scrolling marquee operate in the same
manner, except that the Navigator display has multiple lines of
display and the scrolling marquee has a single line. All further dis-
cussions and examples in this document will be based on the
scrolling marquee display. See Table 2 for the menu structure.
5
ENTER
key and an
key. These keys are
ENTER
and
ar-
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Table of Contents
Troubleshooting
