Safety, Precautions, Installation, Start-up

OPERATING INSTRUCTIONS	OSRAM
2/01/01	SYLVANIA
	Process Heat

Safety

!SHOCK HAZARD Only qualified individuals should install this heater and related controls. Follow all applicable electrical codes and use proper wiring.

!BURN/FIRE/EXPLOSION HAZARD Do not use with or near explosive or reactive gases. Avoid contact with the side, or exposure to the exit-end, during or soon after operation. DO NOT USE NEAR VOLATILE OR COMBUSTIBLE MATERIALS.

Precautions

!Use filtered air. Avoid grease, oil, or oil vapors, corrosive or reactive gases that will damage heater.

!Operate at safe voltages as shown on the PERFORMANCE CURVES. Excess voltage will cause premature failure.

!Always have sufficient airflow through the heater before applying power. Otherwise element will overheat very quickly, and burn out. NOTE: A thermocouple cannot detect temperatures if there is no flow – turn on flow before applying power, even when a controller with a thermocouple is being used.

!Use phase angle fired power controllers. On-off controllers may shorten heater life (or burnout element).

!For closed-loop control, use exposed junction type “K” thermocouple within one inch of the heater exit.

!For closed-loop control, use a temperature controller with a fast sampling period (500ms) and minimal overshoot.

Installation

"Securely mount the heater.

"Connect the filtered air source to the heater.

"If a thermocouple is used, ensure that it is located within one inch from the heater exit.

Start-up

"Reference the PERFORMANCE CURVES section for operational parameters before attempting to operate heater(s).

"Turn on air supply and adjust to desired flow/pressure.

"If using a closed loop system, turn on power to the temperature and power controller, then set the desired temperature on the temperature controller. If using an open loop system, increase power to the heater through the power controller until the desired temperature is attained.

Performance Curves

STYLE A (OPEN ENDED) HEATER CURVES:

The attached performance curves show exit air temperatures at different airflows and voltages. Pressure readings (longer dashed lines) are measured at the inlet to the heater with no entrance or exit restrictions. Solid lines indicate safe, normal life operating conditions. The shorter dash lines indicate marginal, shorter-life operating conditions leading to premature burnout. With a known flow (or pressure) at the heater entrance, follow the flow (or pressure) line across until it meets the desired temperature curve. Drop a line straight down to intersect the x-axis. This point, along the “Heater volts – true RMS” axis, represents the voltage required to generate the desired exit air temperature at the chosen flow rate (inlet pressure).

STYLE B (NOZZLED) HEATER CURVES:

With the small nozzle, it is difficult to measure exit end temperature accurately. Therefore, a different set of performance limits must be used. For these curves, operating with voltages and flows to the left of the curve results in long heater life. Operating to the right of the curve results in heater burn out.

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10226 specifications

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