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Monitor LED's on WF II Controller
Green LED - When illuminated the WarmFlo II controller is receiving 24v power. Under all
normal operating modes, this should be solid green.
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As a secondary function this green LED provides status of the two remote sensors. If a
sensor is inoperative, incorrectly wired, or malfunctioning; this monitor light is in a
blinking or pulsing mode. By checking the pulsing pattern, the appropriate sensor can
be identified.
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OT sensor - 1ØØ ms blink every second.
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ST sensor - two, 1ØØ ms blinks every second.
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Both bad - ½ second on, ½ second off, alternating.
Amber LED – When illuminated the WarmFlo II controller is in the electric heat operating mode.
Inside Warmflo Board, Red LED's - The four red LED's next to the output connector, indicate
Stage 1, 2, 3, and 4 operation (Stage 1 is on the bottom).
EM-WU*****/EM-WD***** Inside Relay Board
COMMENT: The relay board activates from the WarmFlo II controller as the WarmFlo II
controller interprets the "Y" input voltage in relationship to both temperature sensor
requirements. However, the "Y" input also directly controls the Stage 1 triac and the staging
relays. Whenever the "Y" input goes to 0 volts (at the end of the cycle) the relay output
immediately goes off and strip heat is turned off and not necessarily stepped down as shown by
the WarmFlo II monitor Red LED's. This is a safety feature; strip heat cannot be accidentally
kept on by the WarmFlo II controller internal logic if there is no "Y" input.
Inside Red LED - Illuminates when the low voltage hi-limit sensor probe opens. This applies
only after thermostat heat call and WarmFlo II controller is activating the various element stages.
If there is a hi-limit condition, red LED is illuminated. As soon as the hi-limit cools and snaps
back in, red LED extinguishes.
Triac Relay Module (under inside relay board)
This module has its own built-in LED. When the LED is on, the triac switch is closed, elements will be
heating. This LED shall operate coincident with Stage 1 on the WarmFlo board.
07/31/2007
Monitor Light
22
HI320
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