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Control Options for Industrial Direct Fired Heaters
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- senses air pressure drop across the filter, and is mounted in
unit. When the filter becomes dirty, the switch activates a remote
control panel light, indicating a required filter change.
- provided with a 20-amp, 115-volt, GFCI outlet receptacle for field
wiring to customer's 115/1/60 power supply.
- allows for two, separate discharge temperature setpoints for spray
and dry modes in both paint booth applications.
- A clock which cycles the unit on and off, or changes from day to night
operation, at selected times of the day.
- 250°F rated high-limit control mounted in the blower discharge.
If the discharge temperature exceeds the control's settings, the unit
shuts down. Requires manual reset of control.
- relay interlocked with flame-safety relay. When burner fails to light
within 30 seconds, the relay energizes, opening the blower-starter circuit
and shuts down the unit.
- required on all applications where the unit's inlet gas pressure
exceeds 2 psi.
- stops unit operation when unit's inlet gas pressure exceeds setpoint.
Standard on all FM manifolds over 2,500 MBTU and on FIA (IRI) manifolds
over 150 MBTU.
- adapts unit with special construction and controls to high temperature
paint-booth and industrial-process heating applications.
- allows burner circuit, with an electrical interlock, to energize when
modulation control is in low fire. This is accomplished with a relay circuit
on Maxitrol Systems.
- stops unit's operation when inlet gas pressure goes below setpoint.
Standard on FM manifolds over 2,500 MBTU and on FIA (IRI) manifolds over
150 MBTU.
- shuts blower off if discharge temperature drops below 40°F for
longer than five minutes.
- Up to five labeled pilot lights mounted on a remote control panel
face, indicating unit's primary functions.
- clear: blower run light
- clear: burner on light
- amber: low-temperature failure light
- red: flame failure shutdown light
- amber: clogged filter light
- allows unit's blower to run for one minute, purging any gas residue
in the unit, before the burner circuit can energize.
- monitors supply pressure to unit, or to burner on gas manifold. Reads low
gas pressures between 0 and 35".
- monitors supply pressure to unit, or to burner on gas manifold. Reads low
gas pressures between 0 and 15#.
- gas manifold supplied with a motorized gas valve and an internal
micro switch. The valve must be in a closed position, with micro-switch
contact closed, before main burner can energize.
- stops unit's operation when smoke is detected. An ionization smoke
detector and sampling tube are shipped loose for field mounting.
- allows unit to adjust to a building's variable exhaust loads automatically.
Used with a variable frequency drive, the unit can turndown air volume to 40%
of full capacity. Fast-acting dampers maintain proper air velocity across
burner. Control interface prevents overfiring at low speeds.
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