Start-Up Procedures - Rheem RGPH Installation Instructions Manual

START-UP PROCEDURE
HOT SURFACE IGNITION
LIGHTING INSTRUCTIONS
This appliance is equipped with a hot
surface silicon carbide ignition device.
This device lights the main burners each
time the room thermostat (closes) calls
for heat. See lighting instructions on the
furnace.
IMPORTANT: FOR Nox MODELS –
Make a visual inspection of the Nox
inserts to ensure they are in proper
position and have not become dislodged
during shipping or time in the warehouse.
TO START FURNACE
WARNING
!
1. BE SURE THAT THE MANUAL GAS
CONTROL HAS BEEN IN THE
"OFF" POSITION FOR AT LEAST
FIVE MINUTES. DO NOT ATTEMPT
TO MANUALLY LIGHT THE MAIN
BURNERS. FAILURE TO FOLLOW
THIS WARNING CAN CAUSE A
FIRE OR AN EXPLOSION
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
2. Set the room thermostat to the lowest
setting.
3. Turn the gas control knob to the "On"
position, or move the gas control lever
to the "On" position.
4. Replace the control access door.
5. Turn on the electrical power.
6. Set the room thermostat to a point
above room temperature to light the
main burners. After the burners are lit,
set room thermostat to a desired
temperature.
TO SHUT DOWN FURNACE
1. Set the room thermostat to its lowest
setting.
2. Shut off the gas to main burners by
turning the gas control knob to the
"Off" position, or by depressing the
gas control lever and moving it to the
"Off" position.
WARNING
!
SHOULD OVERHEATING OCCUR OR
THE GAS SUPPLY FAIL TO SHUT
OFF, SHUT OFF THE MANUAL GAS
VALVE TO THE APPLIANCE BEFORE
SHUTTING OFF THE ELECTRICAL
SUPPLY. FAILURE TO DO SO CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
SEQUENCE OF OPERATION
Honeywell or UTEC Integrated
Controls with Hot Surface Ignition.
1. Each time the thermostat contacts
close, the induced
draft blower (inducer) begins a
prepurge cycle.
2. The air proving negative pressure
switch(es) closes.
26
3. 30 seconds after the pressure
switch(es) close, the hot surface
igniter heats for 30 seconds to full
temperature. The induced draft blower
operates for the complete heating
cycle.
4. After the 30-second igniter warm up,
the gas valve opens for a
9-second trial for ignition.
5. The igniter lights the gas burners and
stays energized for the first 8
seconds after the gas valve opens.
6. 8 seconds after the gas valve opens
the remote flame sensor must
prove flame ignition for one second
using the process of flame
rectification. If the burners don't light,
the system goes through another
ignition sequence. It does this up to
four times.
7. The main blower starts 20 seconds
after the burners ignite.
8. When the thermostat cycle ends, the
gas valve closes, the burners go out,
the induced draft blower runs for a 5-
second post-purge, and the negative
pressure switch(es) open.
9. The main blower continues until timed
off by the setting on the integrated
furnace control board.
Sequence if the system doesn't light
or doesn't sense flame:
1. On a call for heat, the control runs the
inducer for 30 seconds to prepurge.
2. After the 30-second prepurge, the hot
surface igniter heats for 30 seconds.
The inducer continues to run.
3. After the 30-second igniter warm up,
the gas valve opens for a
9-second trial for ignition. The inducer
continues and the igniter stays
energized.
4. If flame is not sensed during the 9th
second after the gas valve opens, the
gas valve closes, and the igniter de-
energizes.
5. After a 30 second inter-purge, the
igniter heats for 30 seconds. After 30
seconds, the gas valve opens for 9
seconds. If no flame is sensed, it
closes the gas valve, the igniter de-
energizes, Both the main blower
and the inducer operate for 180
seconds before the next ignition
trial.
6. It repeats this process up to four
times. At the end of the last try, the
inducer stops immediately. The
system is in "soft" lock out.
7. The above sequence will repeat after
a one hour delay. It will continue
repeating until ignition is successful or
the call for heat is terminated.
8. To reset the lock out, make and
break power either at the
thermostat or at the unit
disconnect switch for 5 to 10
seconds. It then goes through
another set of trials for ignition.
WHITE RODGERS 50A62-101 WITH
HOT SURFACE IGNITION
1. Each time the thermostat contacts
close, the induced draft blower
(inducer) begins a pre-purge cycle.
2. The air proving negative pressure
switch(es) close.
3. 10 seconds after the pressure
switch(es) close, the hot surface
igniter heat up for 20 seconds to full
temperature.
4. After the 20 second igniter warm-up,
the gas valve opens for an 8-
second trial for ignition.
5. The igniter lights the gas burners and
stays energized for one (1) second
after flame is sensed.
6. 7 seconds after the gas valve opens
the remote flame sensor must
prove flame ignition for one second
using the process of flame
rectification. If the burners do not light,
the system goes through another
ignition sequence. It does this up to
four times.
7. When the thermostat cycle ends, the
gas valve closes, the burners go out,
the induced draft blower runs for a 5-
second post-purge, and the negative
pressure switch(es) open.
9. The main blower continues until timed
off by the setting on the integrated
furnace control board.
Sequence if the system doesn't light
or doesn't sense flame:
1. On a call for heat, the control runs the
inducer for 10 seconds to pre-purge.
2. After the 10 second pre-purge, the hot
surface igniter heats for 20 seconds.
The inducer continues to run.
3. After the 20-second igniter warms up,
the gas valve opens for an 8-second
trial for ignition. The inducer continues
and the igniter stays energized.
4. If flame is not sensed during the 8th
second after the gas valve 9opens,
the gas valve closes, and the igniter
de-energizes.
5. After a 30 second inter-purge, the
igniter heats for 20 seconds. After 20
seconds, the gas valve opens for 8
seconds. If no flame is sensed, it
closes the gas valve, the igniter de-
energizes. Both the main blower
and the inducer operate for 180
seconds before the next ignition
trial.
6. It retries up to four times. At the end of
the last try, the inducer stops
immediately. The system is in "soft"
lock out.
7. The above sequence will repeat after
a one hour delay. It will continue
repeating until ignition is successful or
the call for heat is terminated.
8. To reset the lock out, make and
break power either at the
thermostat or at the unit
disconnect switch for 5 to 10
seconds. It then goes through
another set of trials.