Thermon HELLFIRE 400, Installation, Operation & Maintenance Instructions Manual

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Inspect Action
Gas source
Verify propane tank is filled, or natural gas service is open and has pressure.
Open all manual gas shut off valves and inspect all gas lines for leaks.
Electrical service Verify electric service power is on. Close supply circuit breakers.
Electrical supply
Verify correct line voltages at each heater. Must be /- 5% of nominal
voltage.
Verify current draw is less than or equal to nameplate rating.
Gas supply
Verify supply and manifold gas pressures are within nameplate limits when
heater and all connected loads are operating.
Flame signal strength
Verify flame signal strength is stable (+/- 0.5) and between 3.0 and 8.0 micro
amps DC.
If signal strength is low:
Clean or replace flame rod.
Clean flame rod wire connections, or replace wire.
If cleaning or replacement of flame rod and wire does not increase strength,
have burner serviced or replaced.
Burner operation
Note current manifold pressure.
Set manifold pressure to maximum nameplate setting, measure point
nozzle temperature, if point nozzle temperature is 140°F or less above
ambient air temperature have burner serviced or replaced.
Return manifold pressure back to desired setting.
Air switch calibration
Block air intake 80%. Verify heater still operates.
Then block 90% and verify FSR alarms.
If heater fails with 80% or less blockage, recalibrate air switch.
Control and indication wiring
Verify the correct control and indication wiring between the heater and the
signal bungalow.
Energy Management System (EMS)
If heater is operated automatically by an Energy Management System:
–
Verify EMS module is installed and connected with POWER LED lit.
–
Verify controller is in AUTO mode.
–
Verify precipitation detector and ambient temperature sensor
installed and connected.
–
Verify rail thermostat is mounted on rail and connected to surge
isolator.
–
Verify its operation.
Aggressive retry
Verify operation.
Turn gas supply off, toggle heater to “Manual”.
Verify three attempts made followed by lockout.
Return heater to desired operating mode.
Open gas supply.
Reset controller.