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Start-Up Instructions
Follow steps 1 - 6 on initial start-up after heater
installation. For normal start-up, set building control
thermostat above room temperature. The heater will
start.
1. Open all manual fuel supply valves and check
for gas leaks using approved leak detectors. The
gas control valve has a manual shut-off feature
incorporated into the valve assembly. Single stage
only - ensure the indicator on the valve is turned to
the ON position.
FIG. 12
2. Connect the electrical cord to an approved
electrical outlet.
3. This heater includes a direct ignition control
module for purposes of controlling the timing of the
ignition process of the heater as well as monitoring
of the safety functions. A red FAULT LED (light
emitting diode) is on the burner box side. A
flashing red light identifies a problem
in the operation of the heater. Refer to the
troubleshooting decal on the interior of the access
panel for assistance in troubleshooting.
4. On a call for heat, the motor will start and run for
5 seconds and the ON green light will be lit. The
High Heat green light will be lit when the second
stage solenoid is energized. See Fig. 13.
Sentry Tube Heaters
FIG. 13
5. This pre-purge is a safety feature and a normal
operational characteristic prior to ignition taking
place. After five (5) seconds, the igniter will spark.
6. The ignition control will make up to three trials for
ignition. Each trial for ignition will take
approximately ten seconds. If the main burner does
not light, the system will lock out, and a three flash
pattern will be given by the red LED.
NOTE: It is normal for air to be trapped in the gas
hose on new installations. The heater may try more
than once for ignition before the air is finally purged
from the line and ignition takes place.
Shut-Down Instructions
If the heater is to be shut down for cleaning,
maintenance or repair, follow steps 1-4. Otherwise,
set the building's thermostat to off or no heat for
standard shut down.
1. Close all manual fuel supply valves.
2. With the heater lit, allow the heater to burn off
excess fuel in gas supply hose.
3. If applicable, turn the thermostat to off or no heat
position.
4. Disconnect the heater from the electrical supply.
Owner's Manual • Sentry
17
RED FAULT LIGHT
GREEN ON
GREEN HIGH HEAT
(2-STAGE ONLY)
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