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WF-LGR4 Front Monitor LED's
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Utility, off-peak – utility load management receiver is not interrupting.
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HP call – the output "Y" screw terminal is active at 24 volts high. The outdoor unit should
be on and running. This LED will be off when the OT sensor is below the setup ODT value.
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T-stat call – the room thermostat Y or E is active or 24 volts high.
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Cool mode – follows the reversing valve wire, top center pin jumper selects the high logic. If
installed and setup correctly this light is always on when the roomstat lever is in cool.
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Gas call – the furnace "W" or terminal block feeding fan center W is 24 volts high.
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Monitor LED Comments – the "utility, off-peak" LED is a true representation of the load
control blue wires. It will not react to the override switch, A1 tab, program MU timeout,
SOT-S, etc. However, the main WF II board "EL ON" is a true representation of what's
going on within the WarmFlo logic.
Override Switch – the front panel slide switch (very similar to standard Electro-Mate DFC) is a direct
hardware disabling of any WarmFlo and electric elements functions. The room thermostat heat call wire
or function is directly controlling the fossil fuel or gas furnace. This totally resides within this controller,
the WarmFlo II main board could be completely disconnected or completely non-functional but the
override switch will still allow fossil fuel furnace operation. This function can also be on a remote
switch, see page 16 "SB" tab.
Blower Operation – the blower function is totally within this controller and has nothing to do with the
main WarmFlo board. The stat "G" function is directly channeled to the furnace "G". The thermostat
"Y" and "E" activate an internal "furnace G" with an approximate 10-second turn on delay and a 1-
minute turn off delay.
The furnace "Y" is also activated when the internal blower relay is on from an HP heat or cool call.
Strip Heat Disable – To maximize heat pump system energy efficiency and preventing "accidental"
unnecessary resistant strip heat when it is not required, this WarmFlo II disables or locks out strip heat
elements based upon outdoor temperature.
Depending upon program code chip and information in the colored sections, the strip heat may not
activate or operate unless the WF outdoor sensor is below the ODT dial setting. Typically for a heat
pump, factory settings are:
Stage 1 - 5Ø°F
Stage 2 - 38°F
Stage 3 - 36°F
Stage 4 - 34°
Monitor LED's on WF II Board
Green LED - When illuminated WarmFlo II 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 WarmFlo II is in the electric heat operating mode.
01/10/2008
OPERATION INDICATORS
WarmFlo II Main Board
12
HI321
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