Bryant 574D Owner's Manual download pdf (Page 4)

UNIT INTRODUCTION

These units are 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 Puronr,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. 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 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.)

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.

11. Set the temperature selector on room thermostat to desired

setting.

Compressor

Access

Panel

Filter Access Panel

For Accessory Filter Rack

Blower

Access

Panel

Control

Access

Panel

A09213

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.

WARNING

To shut off unit gas heat:

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.

WARNING

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.

1. 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.)

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

OFF position.

6. Replace the control access panel.

To start unit electric cooli ng:

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

1. 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.

5. Set the temperature selector on room thermostat slightly

below the room temperature to start unit.

To shut off unit electric cooling:

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

1. 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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Bryant 574D Owner's Manual Page 4

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