Heating Sequence Of Operation; Ignition Control Led - HeatStar HSU50 Instrucciones De Funcionamiento Y Manual Del Propietario

1. STOP! Make sure you have read and understand all of the safety
information regarding the operation of this gas appliance. Any and
all service should be performed by a licensed installer
2. Set the thermostat to lowest setting.
3. Turn off all electrical power to appliance.
4. This appliance is equipped with an ignition device which
automatically lights burner. DO NOT attempt to light the burners
manually.
5. There is a black rotary switch knob that can be moved between the
on and off position. Rotate the switch knob to the off position. (See
Figure 9)
6. Wait five minutes to clear out any gas. If you then smell gas, STOP!
Immediately call your gas supplier from a neighbor's phone. Follow
the gas supplier's instructions. If you do not smell gas go to next
step.
7. Rotate the black switch knob to ON.
8. Turn on electrical power to unit.
9. Set the thermostat to desired setting.
10. The combustion air blower will start. The burners will light within
30 seconds.
11. If unit does not light first time (gas line not fully purged) it will
attempt up to two more ignitions before locking out.
12. If lockout occurs, repeat steps 1 through 9.
13. If appliance still will not operate, follow the instructions "TO TURN
OFF GAS TO UNIT" and call your service technician or gas supplier.
TO TURN OFF GAS TO UNIT
1. Set thermostat to lowest level.
2. Turn off all electrical power to unit if service is to be performed.
3. Rotate black knob to OFF position.

HEATING SEQUENCE OF OPERATION

1. When the thermostat calls for heat, the combustion air blower
starts immediately.
2. Combustion air pressure switch proves blower operation before
allowing power to the ignition controller. This switch is factory set
and no adjustment is necessary.
3. After pre-purge of approximately 30 seconds, the spark ignition is
energized and the solenoid valve opens in the gas valve.
4. The spark then ignites the gas, the ignition sensor proves the flame
and the combustion process continues.
5. In the event that the flame is not detected after the first 10-second
trial for ignition, the controller will repeat steps 3 and 4 an
additional two times before locking out the gas valve. Refer
to ignition control board table 3. Ignition control will then
automatically repeat steps 3, 4, and 5 after 60 minutes.
To interrupt the 60-minute lockout period, move thermostat from
"HEAT" to "OFF" then back to "HEAT." Heating sequence then
restarts at step 1.
6. The burners shall light without noticeable crossover delay. There
shall be no flame lifting from the burner heads, flashback or
burning within the burner. The flames shall be predominantly blue
in color and shall be approximately centered in the tubes with no
apparent impingement taking place. If your burner characteristics
11
Compact Unit / Utility Heater
do not match those described above. Refer to the trouble shooting
sections.
7. The ignition control will energize the fan approximately 45 seconds
after ignition is established.
8. After the thermostat demand is satisfied the gas valve is closed; 5
seconds after the demand is satisfied the combustion air blower is
shut off.
9. The control center shall shut off the system fan approximately 150
seconds after the gas valve is de-energized.

IGNITION CONTROL LED

The ignition control board contains a green LED which indicates the
following:
TABLE 3 IGNITION CONTROL LED
LED
Slow Flash Normal Operation - No call for heat.
Fast Flash
Current signal at FLAME terminal 0.6 to 1.0 microamps
System lockout - failed to detect or sustain flame
2 Flashes
Current signal at FLAME terminal <0.6 microamps
Pressure switch failed closed before CAB is energized or failed
3 Flashes
4 Flashes
5 Flashes Flame sensed and gas valve not energized
Steady Off Loss of power/Check 3AMP Fuse on circuit board
Steady On
*When thermostat is placed in continuous fan mode LED will slowly
LIMIT CONTROL
The limit control switch is factory set and not field adjustable.
LOUVER VANE ADJUSTMENTS
Rotate louver vanes to direct airflow upward, downward, straight,
or any combination of these directions. When unit is installed in an
inverted position, louvers may be positioned in the same manner.
COMBUSTION AIR PRESSURE SWITCH
This pressure switch checks for proper combustion air blower
operation before allowing an ignition trial. The switch is factory set
and no field adjustment is necessary. If a 3 flash LED occurs Please
make sure your venting is not blocked up. Next, remove the end of
the pressure switch tubing from the EXHAUST FAN hose barb. There
might be an obstruction in the hose barb opening clear out the
opening with a thin object that will fit inside the hose barb. Push that
through the length of the hose barb PLUS at least another 1/2 inch,
into the exhaust fan housing. This will clear out anything stopping the
vacuum from engaging the pressure switch.
FLAME ROLLOUT SWITCH
The flame rollout switch(es) are located on the burner box top, behind
the ignition control board. This normally closed switch opens on a
temperature rise. Check for adequate combustion air before manually
resetting switch.
Operating Instructions and Owner's Manual
UNIT OPERATION
Normal Operation - Call for heat
open after CAB is energized
High limit or rollout switch open
Ignition control failure
flash