Warning, Unit introduction – Carrier 48VL-A User Manual

Page 3

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UNIT INTRODUCTION

These 48ES-A and 48VL-A units are a small packaged gas
heat/electric cooling system that can utilize the comfort of gas
heating packaged along with efficient electric air conditioning.
This unit uses Puron®, the ozone friendly refrigerant for cooling.

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. 3 while proceeding with
the following steps.

f. Set the temperature selector on room thermostat to the low­

est 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 control access panel with a 3/16-in. nut driver.

(See Fig. 3.)

3. Move the selector switch on the internal gas valve to the

OFF position and wait 3 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 3 seconds. If the burner
does not light within 3 seconds, the ignition module will go
into a Retry Mode after a period of approximately 22
seconds (following the 3-second ignition period). If the

burners do not light within 13 minutes of the initial call for
heat, there is a lockout.

11. Set the temperature selector on room thermostat to desired

setting.

WARNING

Fig. 3 - Accessory Filter Rack Access Panel

FIRE AND EXPLOSION HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.

1. If the main burners fail to light, or the blower fails to

start, shut down gas heating section and call your dealer for
service.
2. Never 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, then call your dealer as
soon as possible.

To shut off unit gas heat:

WARNING

FIRE,

EXPLOSION,

ELECTRICAL

SHOCK

HAZARD

Failure to follow this warning could result in personal
injury, death, and/or property damage.

Do not turn off the electrical power to unit without first
turning off the gas supply.

NOTE: If the unit is being shut down because of a malfunction,
call your dealer as soon as possible.

Should overheating occur or the gas supply fail to shut off, shut

off the external 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 any gas
control which has been under water.

Refer to Fig. 6 while proceeding with the following steps.

f. Set the temperature selector on room thermostat to lowest

temperature setting and set system SWITCH to OFF.

2. Close the external manual shutoff valve.

3. Turn off the electrical power supply to the unit.

4. Remove the control access panel. (See Fig. 3.)

3. Move the selector switch on the internal gas valve to the

OFF position.

6. Replace the control access panel.

To start unit electric cooling:

Refer to Fig. 7 while proceeding with the following steps.

f. Set the temperature selector on room thermostat to highest

temperature setting and set system SWITCH to OFF.

2. Close the external manual shutoff valve, if not already

closed.

3. Turn ON the electrical power supply to the unit.

4. Set system switch to COOL.

3. Set the temperature selector on room thermostat slightly be­

low the room temperature to start unit.

To shut off unit electric cooling:

Refer to Fig. 8 while proceeding with the following steps.

f. Set the temperature selector on room thermostat to highest

temperature setting and set system SWITCH to OFF.

2. Close the external manual shutoff valve, if not already

closed.

3. Turn off the electrical power supply to the unit.

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