Carrier COMFORT 48EZ-A - Manual (Page 3)

3
FIRE AND EXPLOSION HAZARD
Failure to follow this hazard warning could result in
personal injury, death and/or property damage.
What to do if you smell gas:
1. Do not try to light any appliance.
2. Do not touch any electrical switch; do not use any phone
in your building.
3. Leave the building immediately.
4. Immediately call your gas supplier from a nearby phone.
Follow the gas supplier’s instructions.
5. If you cannot reach your gas supplier, call the fire
department.
! WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury and/or death.
Before performing recommended maintenance, be sure the
main power switch to unit is turned off and lock--out tag is
installed.
! WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK
HAZARD
Failure to follow this hazard 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.
! WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Do not attempt to light by hand.
!
WARNING
CUT HAZARD
Failure to follow this caution may result in personal injury.
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.
! CAUTION
UNIT INTRODUCTION
The 48EZ--A and 48VT--A units are small packaged gas
heat/electric heat pump systems that can utilize both the efficiency
of heat pump heating and the comfort of gas heating. The system
will optimize for ideal heating, depending on several factors. This
unit uses Puron®, the ozone friendly refrigerant, for cooling and
heat pump heating.
Starting or Shutting Off Unit
NOTE: Your combination heating/cooling unit is equipped with
an automatic direct spark ignition and power combustion blower.
To start unit gas heat:
Refer to Fig. 3 for location of unit front access panel. Refer to Fig.
4 for location of gas valve. Refer to Fig. 5 while proceeding with
the following steps.
1. Set the temperature selector on room thermostat to the low-
est temperature setting and set system switch to Emergency
Heat.
2. Close the external manual gas shutoff valve.
3. Turn off the electrical supply to the unit.
4. Remove the control access panel with a 5/16--in. nut driver.
(See Fig. 3.)
Compressor
Access
Panel
Filter Access Panel
For Accessory Filter Rack
Blower
Access
Panel
Control
Access
Panel
A09213
Fig. 3 -- Unit Access Panels
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 control 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 seconds. If the burner
does not light within 5 seconds, the ignition module will go
into a Retry Mode after a period of approximately 22
seconds (following the 5--second ignition period). If the
burners do not light within 15 minutes of the initial call for
heat, there is a lockout.