Comfortlink Control; To Light Unit - Carrier 48HC User's Information Manual

COMFORTLINK CONTROL

These units have a factory- - installed Carrier ComfortLink
control. A Scrolling Marquee display is located in the unit
control box. To ensure complete unit shut off, use the
procedures in this book.

TO LIGHT UNIT

WARNING
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
1. Do not turn off the electrical power to unit
without first turning off the gas supply.
2. Before attempting to start the gas heating section,
familiarize yourself with all the procedures that
must be followed.
3. Never attempt to manually light the burners on
the unit with a match, lighter, or any other flame.
If the electric sparking device fails to light the
burners, refer to the shutdown procedures, then
call your dealer as soon as possible.
Turn off the unit demand for cooling or
Step 1 —
heating by using the Scrolling Marquee (see Fig. 1),
located in the unit's control box. See Fig. 5 for
control box location.
a. Push the ESCAPE key until a blank display
screen is shown.
b. Push the DOWN arrow key until the SERVICE
TEST LED is lit.
c. Push the ENTER key. The display will show
TEST.
d. Push the ENTER key again. The NO/YES dis-
play will flash.
e. Push the UP or DOWN key to toggle the display
to YES and then push ENTER. The unit will be
locked off from heat, cooling or any operation.
The controls will still function and the display
will still operate.
NOTE: A password may be required to change Service
Test values depending on the previous settings configured
in the unit. The default password is "1111."
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Alarm Status
Inputs
Outputs
ESCAPE
Configuration
Time Clock
Operating Modes
Alarms
Fig. 1 - - ComfortLink Controller
Turn off the gas supply by closing the gas
Step 2 —
supply shut- -off valve (external to RTU unit). See Fig.
2 for location.
ENTER
C06320
Gas Supply Shut Off Valve
(Field Supplied)
Fig. 2 - - Gas Supply Shut- - Off Valve Location
Fig. 3 - - Gas Supply Shut Off Valve
Turn off the electrical supply to the unit by
Step 3 —
switching the RTU main disconnect to OFF. Then,
ensure personal safety by installing a lockout tag on
the disconnect.
MAIN
Fig. 4 - - RTU Main Disconnect - - Electrical Supply
Remove the gas component access panel.
Step 4 —
See Figs. 5 and 6.
Fig. 5 - - Typical Access Panel Locations —
48 HC 17 Base Unit Shown
3
C08485
C07330
ON
OFF
C07331
Gas Component
Access Panel
Filter Access Panel
Control Box
Access Panel
C11482