48P2,P3,P4,P5030-100
Gas Heating/Electric Cooling Units
with COMFORTLINK™ Controls
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 rooftop unit is equipped
with an automatic direct spark ignition system and induceddraft 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 for location of gas valve(s). Refer to Fig. 2 while
proceeding with the following steps.
1. Turn off the unit demand for cooling or heating 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.
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. Open the burner section hinged access door.
5. Move the switch on the gas valves 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.
6. Move the switch on the gas valves to the ON position.
7. Close the burner section hinged access door.
8. Turn on the electrical supply to the units.
9. Open the field-installed manual gas valve.
ESCAPE
ENTER
ENTER
ENTER
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480054-01 Printed in U.S.A. Form 48P-1SO Pg 1 4-09 Replaces: New
FLUE
OUTLET
GAS VALV E
LIMIT
SWITCH
NO. 2
SECTION 2
LIMIT
SWITCH
NO. 1
FLUE
OUTLET
SECTION 1
FLUE
OUTLET
SECTION 2
FLUE
OUTLET
SECTION 1
GAS VALV E
LIMIT
SWITCH
NO. 1
NOTE: High heat consists of sections 1 and 2. Low heat consists
of section 1 only.
030-050 SIZES
Fig. 1 — Heat Section Details
a48-8445a
LIMIT
SWITCH
NO. 1
FLUE
OUTLET
SECTION 2
GAS VALV E
FLUE
OUTLET
SECTION 1
GAS VALV E
LIMIT
SWITCH
NO. 2
FLUE
OUTLET
SECTION 3
GAS VALV E
GAS VALV E
LIMIT
SWITCH
NO. 2
NOTE: High heat consists of sections 1-3. Low heat consists of
sections 1 and 2 only.
GAS VALV E
055-100 SIZES LOW HEAT
a48-8445b
10. Using the scrolling marquee, enable the unit to run using
the following procedure:
a. Push the key unit a blank display screen
ESCAPE
is shown.
b. Push the key until the SERVICE TEST LED is
lit.
c. Push the key. The display will show
ENTER
STOP.
d. Push the key again. The NO/YES display
ENTER
will flash.
e. Push the or key to toggle the display to NO
and then push . The unit will return to
ENTER
normal operation and exit SERVICE TEST mode.
11. To test the operation of the gas section, use the scrolling
marquee Service Test routine to energize the gas outputs
and to turn on the gas. Refer to the unit Controls, StartUp, Operation, Service and Troubleshooting literature for
more information.
12. For normal operation, make sure that units with a conventional thermostat are set to heating control temperature.
On VAV (variable air volume) and constant volume units
with a space temperature sensor, make sure that the set
points are at the normal heat set points.
NOTE: High heat consists of sections 1-3. Low heat consists of
sections 1 and 2 only.
055-100 SIZES HIGH HEAT
Fig. 1 — Heat Section Details (cont)
a48-8446
WARNING
If the main burners fail to light or the blower fails to start,
shut down gas heating section and call your dealer for service. Failure to follow these requirements could result in
serious personal injury.
2
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ESCAPE
MAIN
ON
ENTER
OFF
a48-8298
STEP 1
STEP 4
STEP 2
STEP 5
LOCK-OUT
STEP 3
a48-8297
TAG
STEP 8
STEP 6
STEP 9
Fig. 2 — To Light Unit
3
STEP 7
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Alarm Status
ESCAPE
STEP 10
ENTER