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16.6.4 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.
All models use a flame rod to detect the flame
(between 6 to 8 Vdc).
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
79, Section 23)
FIGURE 24: Interconect Wiring 1
16.6.5 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.
16.6.6 Positive Low Fire Start
This feature forces the burner to start in low fire
rather than high fire during the air handler's start-up
sequence of operations. The burner maintains its low
fire setting for 10 seconds (as per timer setpoint)
before it begins to modulate.
SECTION 16: E
LECTRICAL
43
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