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Document: GFH-NT 1500-4000 IM 14 DEC 2016
Gas Fired Heater Instructions
©2016 NOVATEC, Inc. All Rights Reserved
3.0
After 1 minute of air purging, the automatic 10 seconds trial for ignition is initiated.
Simultaneously, the pilot gas solenoid valves (1SOL & 3SOL) and the ignition
transformer (2T) are energized so that the igniter gives off a continuous spark.
If a flame is detected by the flame rod within the 10-second period, the ignition
transformer is de-energized (The pilot gas solenoids remain open). A red LED located
in the flame signal test port on the flame controller will glow. The dual modular main
gas safety shutoff valves are simultaneously energized. The dual modular main gas
safety shutoff valves (2SOL) open slowly so that the pilot is not overloaded. The APS
remains closed. The neon indicator light (see section 2.2) in the LGPS and HGPS will
remain on. The POC indicator light will turn from orange to green.
4.0
If a problem occurs, the burner controller will lock out the sequence. The "Flame
Failure” red LED on the flame controller will glow. The flame controller must be
manually reset to start another sequence. The reset button is located on the flame
controller. Complete operational details for the flame controller can be found in the
Veri-Flame Purge Flame Monitoring Controller Series 5602 & 5605 bulletin located
elsewhere in this manual.
5.0
If the combustion high temperature limit with Display (CHTL) opens, it must be
manually reset to initiate another complete cycle, starting with the air purge sequence
(item 2.1). The reset button is located on the CHTL. The flame controller must also be
reset.
6.0
If the process air high temperature limit switch (PHTL) opens, it must be manually reset
to initiate another complete cycle, starting with the air purge sequence (item 2.1). The
reset button is located on the PHTL. The flame controller must also be reset.
7.0
The temperature of the process air is controlled by the NOVATOUCH PLC Control
that is located in the desiccant dryers main control box. A 4-20 ma signal is sent to the
modulating actuator that controls the main gas automatic butterfly valve in a range from
closed (15 degrees) to open (90 degrees).
8.0
If the Desiccant Dryers Process Blower Motor is not running the main gas automatic
butterfly valve will be driven to the closed position (LF). If the process blower remains
off for longer then 2 minutes, the process blower maximum off delay timer contact will
open, shutting down the burner. Toggling the gas heater start contact from the
NOVATOUCH PLC control located at the desiccant dryer resets the process blower
maximum off delay circuit. The NOVATOUCH PLC control automatically toggles the
gas heater start contact when the alarm is reset using the NOVATOUCH PLC touch
panel on the desiccant dryer.
Combustion Air Proof Switch
with test Button
