4000-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
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19.6.4 Flame Control
This device will check for both pilot flame and main
flame within the burner. When a flame signal from the
pilot flame is available, it will allow the main gas valve
to open.
Yo ur air handler may equipped with either a flame rod
or UV scanner type of flame detection. Consult your
parts list / electrical diagram to confirm and for flame
rod sensors See Page 115 and Page 116. For UV
scanners See Page 119 and Page 120
If a pilot flame is not present, the electrical signal
cannot be sent and the pilot burner gas valve will
close. The relay is equipped with a 10-second trial for
ignition. If ignition does not occur, the flame
safeguard relay will lockout, it will reset upon power
restoration. (See the Trouble-Shooting Guide - Page
136, Section 24)
19.6.5 Discharge Temperature Sensor
This device senses the discharge temperature of the
air at the blower. The discharge temperature sensor
reports the discharge temperature to the temperature
control amplifier
which modulates the burner to the
temperature set on the remote panel selector. Should
this system fail, the manual high temperature limit
switch will turn the burner off. BMS-ready air
handlers do not come equipped with this sensor and
must be field-supplied.
Yo ur Rapid
®
direct fired air handler was built custom
to meet your needs. For details on interconnect
wiring or any other wiring questions, please consult
the specific wiring diagrams provided with your air
handler.
NOTE: A laminated wiring diagram can be found
permanently affixed inside the unit control enclosure.
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