Carrier 48A3, 48A2 User Manual
48A2,A3,A4,A5020-060
Single-Package Rooftop
Gas Heating/Electric Cooling Units
with COMFORTLINK™ Controls and Scroll Compressors
User’s Information Manual
NOTE TO INSTALLER
This manual should be left with the equipment owner.
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or loss of life.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your
building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or
additional information consult a qualified installer,
service agency, or the gas supplier.
WARNING
Before performing recommended maintenance, be sure
main power switch to unit is turned off and lockout tag is
installed. Electrical shock could cause personal injury.
Your combination heating/cooling unit is equipped with
direct spark ignition and induced draft power combustion
blower.
WARNING
Burners will light automatically. Do not attempt to light by
hand; personal injury may result.
TO LIGHT UNIT
DANGER
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.
If you do not follow these instructions exactly, a fire or
explosion may result, causing property damage, injury, or
loss of life.
See Fig. 1 and 2 for location of gas valve. Refer to Fig. 3
while performing the following steps.
1. Disable unit operation by using the scrolling marquee.
The scrolling marquee is located in the control box at the
compressor end of the unit.
a. Push the key unit a blank display screen
is shown.
b. Push the key until the SERVICE TEST LED is
lit.
c. Push the key. The display will show
STOP.
NOTE: 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 default password is 1111.
d. Push the key again. The NO/YES display
will flash.
e. Push the or key to toggle the display to
YES and then push . The unit will be
locked off from heating, cooling or any operation.
The controls will still function and the display will
still operate.
2. Close the field-installed manual gas shutoff valve.
3. Turn off the electrical power to the unit using the optional
disconnect or the field-installed disconnect and lock off
using proper lockout and tag-out procedures.
4. Remove the gas section panels.
5. Move the switch on the gas valve to the OFF position and
wait 5 minutes.
NOTE: If this is the first installation of the unit, the gas
flue hoods must be installed before operating unit. These
must be installed for the unit to run properly.
ESCAPE
ENTER
ENTER
ENTER
ENTER
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
Ta b 1 a
Catalog No. 04-53480052-01 Printed in U.S.A. Form 48A-5SO Pg 1 3-08 Replaces: 48A-3SO
GAS VALV E
Fig. 1 — Typical Gas Section Location (48A3027 Shown)
GAS HEAT
SECTION
(PANEL REMOVED)
A48-8367
Fig. 2 — Typical Gas Valve Location (48A2,A3,A4,A5020-050 Shown)
2
a48-3766tf
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
a30-2239ef
Alarm Status
ESCAPE
ENTER
a48-925tf
a48-924tf
STEP 1
STEP 4
STEP 2
STEP 3
a48-3767tf
STEP 5
a48-930tf
STEP 6
STEP 8
a48-3768tf
a48-931tf
STEP 9
Fig. 3 — To Light Unit
3
STEP 7
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
a30-2239ef
Alarm Status
ESCAPE
STEP 10
ENTER
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