Safety Considerations; Unit Introduction; Starting Or Shutting Unit Off; Gas Heating/Electric Cooling Unit - Carrier 48SD Owner's Information Manual

SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due to
mechanical and electrical components. Only trained and qualified
personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on la-
bels attached to or shipped with the unit and other safety precautions
that may apply.
Follow all safety codes. Installation must be in compliance with lo-
cal and national building codes. Wear safety glasses, protective
clothing, and work gloves. Have fire extinguisher available. Read
these instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit.
Recognize safety information. This is the safety-alert symbol ,_
When you see this symbol on the unit and in instructions or manuals.
be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING. and CAU-
TION. These words are used with the safety-alert symbol. DAN-
GER identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify un-
safe practices which may result in minor personal injury or product
and property damage. NOTE is used to highlight suggestions which
will result in enhanced installation, reliability, or operation.
Note: Installer: This manual should be left with the equipment user.
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death, personal
injury and/or property damage.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
UNIT INTRODUCTION
This 48SD unit is a small packaged gas heat/electric cooling system
that can utilize the comfort of gas heating packaged along with effi-
cient electric air conditioning.
Starting or Shutting Unit Off:
Note: Your combination heating/cooling unit is equipped with an
automatic direct spark ignition and power combustion blower.
To start (light) unit:
Refer to Fig. 2 for location of unit access panel. Refer to Fig. 3 for
location of gas valve. Refer to Fig. 4 while proceeding with the
following steps.
1. Set the temperature selector on room thermostat to the lowest
temperature setting and set system switch to HEAT.
2. Close the external manual gas shutoff valve.
3. Turn off the electrical supply to the unit.
4. Remove the front access panel with a 5/16-in. nut driver.
5. Move the selector switch on the internal gas valve to the OFF
position and wait 5 minutes.
6. Move the selector switch on the internal gas valve to the ON
position.
7. Replace the front access panel.
8. Turn on the electrical supply to unit.
9. Open the external manual gas shutoff valve.
10. Set the temperature selector on room thermostat slightly
above 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 sec. If the burner does
not light within 5 sec, the ignition module will go into a Retry
Mode after a period of approximately 22 sec (following the
5-sec ignition period). If the burners do not light within 15
minutes of the initial call for heat, there is a lockout.
11. Set the temperature selector on room thermostat to desired
setting.
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Do not use this unit if any part has been underwater.
Immediately call a qualified service technician to inspect the
unit and to replace any part of the control system which has
been underwater.
ELECTRICAL SHOCK AND CUT HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal parts
and screws. Although special care is taken to reduce sharp
edges to a minimum, be extremely careful when handling
parts or reaching into the unit.
FRONT ACCESS
PANEL
Fig. 2 - Gas Heating/Electric Cooling Unit
A05175