Rheem GLH series, Installation Instructions Manual

Page: 24 / 36

24
LIGHTING INSTRUCTIONS
This appliance is equipped with either a
direct spark ignition device or 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.
TO START FURNACE
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 thermostat to lowest setting.
3. Turn off all electric power to the
appliance.
4. This appliance does not have a pilot.
It is equipped with an ignition device
which automatically lights the burner.
Do NOT try to light the burner by hand.
5. Remove control door.
6. Move switch to the "OFF" position.
NOTE: Use only your hand to move
the gas control switch. Never use
tools. If the switch will not move by
hand, don't try to repair it; call a
qualified service technician. Force
or attempted repair may result in a
fire or explosion.
7. Wait five (5) minutes to clear out any
gas. Then smell for gas, including
near the floor. If you smell gas, STOP!
Follow the safety instructions on the
front page of this manual. If you don't
smell gas, go to the next step.
8. Move switch from "OFF" position to
"ON" position.
9. Replace control door.
10. Turn on all electric power to the
appliance.
11. Set the thermostat to desired setting.
12. If the appliance will not operate, follow
the instructions below to shut down
furnace and call your service
technician or gas supplier.
TO TURN OFF GAS TO FURNACE
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the
appliance if service is to be performed.
3. Remove control door.
4. Move switch to the "OFF" position.
5. Replace control door.
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
UT Electronic Controls Direct Spark
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.
3. 30 seconds after the pressure
switch(es) close, the spark igniter
energizes.
The induced draft blower
operates for the complete heating
cycle.
4. After the spark igniter energizes, the
gas valve opens for a 8-second trial
for ignition.
5. The igniter lights the gas burners.
6. After the gas valve opens the 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 stops after
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 pre-purge, the
spark igniter energizes. The inducer
continues to run.
3. After the spark igniter energizes, the
gas valve opens for a 8-second trial
for ignition. The inducer continues and
the igniter stays energized.
4. If flame is not sensed within 8
seconds after the gas valve opens,
the gas valve closes, and the igniter
de-energizes.
5. After a 30-second inter-purge, the
igniter is energized, 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. 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.
UT Electronic Controls 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.
3. 5 seconds after the pressure
switch(es) close, the hot surface
igniter begins heating 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 an 8-
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. 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 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. 5 seconds into prepurge, the hot
surface igniter begins heating for 30
seconds. The inducer continues to
run.
3. After the 30-second igniter warm 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 opens, the
gas valve closes, and the igniter de-
energizes.
WARNING
!
START-UP PROCEDURE