48HJ004-014
Single-Package Rooftop
Heating/Cooling Units
User’s Information Manual
48HJ004-014
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 flam-
mable 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 performed
by a qualified installer, service agency or the
gas supplier.
Improper installation, adjustment, alteration, service or maintenance can cause property damage,
serious injury or death. Refer to this manual. For
assistance or additional information consult a
qualified installer, service agency, or the gas
supplier.
Before performing recommended maintenance, be sure
main power switch to unit is turned off. Electrical shock
could cause serious injury or death.
TO LIGHT UNIT
1. D o 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.
If you do not follow these instructions exactly, a fire or
explosion may result. Property damage, injury, or loss of
life could occur.
See Fig. 1A and 1B for location of gas valve. Refer to Fig. 2
while proceeding with the following steps.
Step 1 —
setting and set SYSTEM switch to HEA T or AUT O. position.
Step 2 —
Step 3 —
disconnect.
Step 4 —
Step 5 —
and wait 5 minutes.
Step 6 —
Step 7 —
Step 8 —
Step 9 —
Step 10 —
room temperature to start unit. The induced-draft combustion
air fan will start. Main gas valve will open and main burners
should ignite within 5 seconds. If the burners do not light, there
is a 22-second delay before another 5-second try. If the burner
still does not light, the time delay is repeated. If the burner does
not light within 15 minutes, there is a lockout. To reset the control, break the 24-v power to W1. Repeat Steps 1-10. If burners
still do not light, call for service.
Step 11 —
to desired setting.
Set room thermostat to the lowest temperature
Close the manual gas valve.
Turn off the electrical supply to the unit, tag
Remove the compressor access panel.
Move the gas valve switch to the OFF position
Move the gas valve switch to the ON position.
Replace the compressor access panel.
Turn on the electrical supply to unit.
Open the manual gas valve.
Set room thermostat selector slightly above
Set the temperature selector on room thermostat
Your rooftop com bination heating/cooling unit is equipped
with an automatic direct spark ignition and induced-draft combustion blower.
Do not attempt to light by hand; serious injury or death
may result.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Ta b 1 a 6 a
PC 111 Catalog No. 534-80017 Printed in U.S.A. Form 48HJ-2SO Pg 1 11-00 Replaces: 48GJ,HJ-1SO
If the main burners fail to light, or the blower fails to come
on, shut down gas heating section and call your dealer for
service. Failure to follow these requirements could result in
serious injury or death.
COMPRESSOR ACCESS PANEL
Fig. 1A — Gas Valve Location
(48HJ004-007)
Fig. 1B — Gas Valve Location
(48HJ008-014)
TO SHUT UNIT OFF
GAS VALVE
INTAKE LOUVERS
FLUE OPENING
Refer to Fig. 3 while proceeding with the following steps.
Step 1 —
Set room ther m ostat to lowest te m pe ra t u r e set ting
and set SYSTEM switc h to O FF.
Step 2 —
Step 3 —
Close the external manual gas valve.
Turn off the electrical power supply to unit;
install lockout tag.
Step 4 —
Step 5 —
Step 6 —
Step 7 —
Remove the compressor access panel.
Move the gas valve switch to the OFF position.
Replace compressor access panel.
If unit is being shut down because of a malfunc-
tion, call your dealer as soon as possible.
If unit is being shut down because the heating season has
ended, restore electrical power to the unit and set thermostat to
the COOL position to ensure operation of the cooling system
during the cooling season.
Should overheating occur, or the gas supply fail to shut off,
shut off the manual gas valve to the unit before shutting off the
electrical supply.
Do not use this unit if any part has been under water. Immediately call a qualified service technician to inspect the unit and
to replace any part of the control system and gas control that
has been under water.
MAINTAINING YOUR UNIT
All maintenance should be handled by skilled, experienced
personnel. Your Carri er service technician ca n help you set up
a maintenance schedule.
For your safety, keep the area around the unit clear and free
of combustible materials, gasoline, and other flammable liquids and vapors.
To ensure proper functioning of the unit, flow of combustion and ventilating air must not be obstructed f rom reaching
the unit. Clearance of at least 3 ft on flue and condenser sides
and 6 in. on all other sides is required.
1. D o not turn off the electrical power to unit without
first turning off the gas supply .
2. N ever attempt to manually light the main burners on
unit with a match, lighter, or any other flame. If the
electric sparking device fails to light the main burners,
refer to the following shutdown procedures. Call your
dealer as soon as possible.
Failure to follow these procedures can result in fire, seri-
ous injury or death.
2
O
F
F
ON
C
HI
M
R
E
P
L
A
C
E
S
C
R
E
W
L
O
STEP 1
MAIN
ON
OFF
LOCK-OUT
TAG
STEP 3STEP 2
2-STAGE GAS VALVE
W
E
O
R
C
L
S
E
C
A
R
L
P
M
C
HI
48HJD005,006*
48HJE004-006*
48HJF004-006*
48HJD007-014
48HJE007-014
48HJF007-014
E
ON
F
F
O
STEP 4
SINGLE-STAGE GAS
VALVE
WR
P3
C2
M1
ON
F
F
O
48HJD005,006†
48HJE004-006†
48HJF004-006†
48HJG005,006
48HJH004-006
48HJK004-006
48HJL005,006
48HJM004-006
48HJN004-006
STEP 6
2-STAGE GAS VALVE
48HJD005,006*
48HJE004-006*
48HJF004-006*
48HJD007-014
48HJE007-014
48HJF007-014
STEP 7
STEP 5
SINGLE-STAGE GAS
VALVE
WR
P3
C2
M1
ON
F
F
O
48HJD005,006†
48HJE004-006†
48HJF004-006†
48HJG005,006
48HJH004-006
48HJK004-006
48HJL005,006
48HJM004-006
48HJN004-006
*3-phase units only.
†Single-phase units only.
STEP 8
STEP 9
STEP 10
Fig. 2 — To Light Unit
3
Loading...