Carrier /50HC 04-28, Controls, Start-Up, Operation And Troubleshooting, Page: 4 / 144

4
GENERAL
This publication contains Start-Up, Controls, Operation, and
Troubleshooting information for the 48/50HC rooftop units.
(See Table 1.) These units are equipped with Comfort Link con-
trols version 3.X or higher and use Puron ® refrigerant. The spe-
cific base unit installation instructions, service manual and/or
wiring label diagram may also be required in conjunction with
this book as a guide to a specific unit on the roof. All the units in
table 1 are Constant Volume (CV) or Staged Air Volume (SAV)
units that provide stand-alone or network operation.
BASIC CONTROL USAGE
Comfort Link Control
The Comfort Link control system is a comprehensive unit-man-
agement system. The control system is easy to access, config-
ure, diagnose and troubleshoot.
The
Comfort Link 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. Multi-
ple units can be linked together (and to other Comfort Link con-
troller equipped units) using a 3-wire communication bus.
The Comfort Link control system is easy to access through the use
of a unit-mounted display module. There is no need to bring a sep-
arate computer to this unit for start-up. Access to control menus is
simplified by the ability to quickly select from 11 menus. A scroll-
ing 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 commu-
nication network at the main control box. 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 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 in-
puts and outputs to check on their values and status, configure op-
erating parameters plus evaluate the current decision status for op-
erating modes. 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. (See Table 2.)
Fig. 1 — Scrolling Marquee
Accessory Navigator™ Display
The accessory hand-held Navigator display can be used with the
48/50HC units. (See Fig. 2.) The Navigator display operates the
same way as the scrolling marquee device. The Navigator display
is plugged into the LEN (local equipment network) port on either
CIB or the J3 port on the ECB (economizer control board).
AVERTISSEMENT
RISQUE D´INCENDIE OU D´EXPLOSION
Si les consignes de sécurité ne sont pas suivies à la lettre,
cela peut entraîner la mort, de graves blessures ou des dom-
mages matériels.
Ne pas entreposer ni utiliser d´essence ni autres vapeurs ou
liquides inflammables à proximité de cet appareil ou de tout
autre appareil.
QUE FAIRE SI UNE ODEUR DE GAZ EST DÉTECTÉE
• Ne mettre en marche aucun appareil.
• Ne toucher aucun interrupteur électrique; ne pas
utiliser de téléphone dans le bâtiment.
• Quitter le bâtiment immédiatement.
• Appeler immédiatement le fournisseur de gaz en
utilisant le téléphone d´un voisin. Suivre les
instructions du fournisseur de gaz.
• Si le fournisseur de gaz n´est pas accessible, appeler le
service d´incendie.
L´installation et l´entretien doivent être effectués par un in-
stallateur ou une entreprise d´entretien qualifié, ou le four-
nisseur de gaz.
Table 1 — Rooftop Units
MODEL SIZE NOMINAL TONS
48/50HC
04 3
05 4
06 5
07 6
08 7.5
09 8.5
11 10
(High Efficiency)
12 10
14 12
17 15
20 18
24 20
28 25
R u n S t a t us
S ervice Te s t
Temper a t u re
Pre ssu re s
S etpoint s
Inp u t s
O u tp u t s
Config u r a tion
Time Clock
Oper a ting Mode s
Al a rm s
Al a rm S t a t us
ENTER
MODE
E S CAPE