Start-Up Procedures; Ignitor Placement, Alignment & Location; To Start The Furnace; To Shut Down The Furnace - Rheem RGPE series Installation Instructions Manual

START-UP PROCEDURES

IGNITOR PLACEMENT,
ALIGNMENT & LOCATION
Ignition failure may be a result of
improper ignitor alignment caused dur-
ing a service call or other work done to
the furnace in the field. When perform-
ing any work on the burner, heat
exchanger, etc., the technician must
check alignment of the spark ignitor.
Misalignment of the ignitor could cause
a failure to light or rough ignition. The
correct ignitor alignment is shown in
Figure 41.

TO START THE FURNACE

DIRECT SPARK IGNITION LIGHTING
INSTRUCTIONS
This appliance is equipped with a direct-
spark ignition device. This device lights
the main burners each time the room
thermostat calls for heat. See the lighting
instructions on the furnace.
During initial start-up, it is not unusual for
odor or smoke to come out of any room
registers. To ensure proper ventilation, it
is recommended to open windows and
doors, before initial firing.
The furnace has a negative pressure
switch that is a safety during a call for
heat. The induced draft blower must pull
a negative pressure on the heat
exchanger to close the negative pressure
switch. The induced draft blower must
maintain at least the negative pressure
switch set point for the furnace to oper-
ate. If the induced draft blower fails to
close or maintain the closing of the nega-
tive pressure switch, a "no heat call"
would result.
FIGURE 41
OPTIMUM IGNITOR LOCATION
1. Remove the burner compartment
control access door.
2. IMPORTANT: Be sure that the man-
ual gas control has been in the
"OFF" position for at least five min-
utes. Do not attempt to manually
light the main burners.
3. Set the room thermostat to its low-
est setting and turn off the furnace
electrical power.
4. Turn the gas control knob to the
"ON" position.
5. Replace the burner compartment
control access door.
WARNING
FAILURE TO REPLACE THE
BURNER DOOR CAN CAUSE
PRODUCTS OF COMBUSTION TO
BE RELEASED INTO THE CONDI-
TIONED AREA RESULTING IN
PERSONAL INJURY OR DEATH.
6. Turn on the manual gas stop.
7. Turn on the furnace electrical power.
8. Turn thermostat to "Heat" mode and
set the room thermostat at least
10°F above room temperature to
light the main burners.
9. After the burners are lit, set the
room thermostat to a desired tem-
perature.
TO SHUT DOWN
THE FURNACE
1. Set the room thermostat to its
lowest setting and turn to "OFF"
position.
2. Turn off the manual gas stop and
turn off the electrical power to the
furnace.
3. Remove the burner compartment
control access door.
4. Shut off the gas to the main
burners by turning the gas con-
trol knob to the "OFF" position.
5. Replace the burner compartment
control access door.
WARNING
SHOULD OVERHEATING
OCCUR OR THE GAS SUPPLY
FAIL TO SHUT OFF, CLOSE
THE MANUAL GAS VALVE
FOR THE APPLIANCE
BEFORE SHUTTING OFF THE
ELECTRICAL SUPPLY. FAIL-
URE TO DO SO CAN CAUSE
AN EXPLOSION OR FIRE
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.

SEQUENCE OF OPERATION

Heating Cycle Initiation
The heating cycle is always initiated
by a 24 volt signal on W of the ther-
mostat or, for communicating sys-
tems, a message is transmitted from
the thermostat to the IFC. When the
controller senses 24 volts on W or the
communicated message for heat call,
the following sequence occurs:
• High and low pressure switches are
checked to insure contacts are
open.
• Inducer is powered on high speed
for a thirty (30) second prepurge.
• Pressure switches are monitored as
the inducer creates the vacuum to
close the contacts.
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