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Furnace Interface Module – WF-EZ3, WF-LGR3, WF-EM3
WF-EZ3, WF-LGR3, and WF-EM3 Front Monitor LED's
•
Utility, off-peak – utility load management receiver is not interrupting.
•
HP or A/C call – the output "Y" screw terminal is active at 24 volts high. The outdoor unit
should be on and running.
•
T-stat call – the room thermostat W and/or Y is active or 24 volts high.
•
Gas call – the fan center "W" or terminal block feeding fan center W is 24 volts high.
•
Standby mode – either override switch, load control receiver (blue wires), or program logic
MU timeout have setup an internal relay function for standby operation. The fossil fuel
furnace (Gas on LED) is now a function of the T-stat call.
•
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, etc.
The "standby mode" LED represents the internal logic condition directed by the various items
requiring fossil fuel furnace or standby action. The actual "gas call" LED is further tied in
with the room thermostat function represented by "t-stat call" LED.
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 the furnace
interface module, the WarmFlo II controller 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 25 "SB" tab.
Blower Operation – the blower function, via furnace fan center "G", is totally within the furnace
interface module (EZ3, LGR3, or EM3) and has nothing to do with the main WarmFlo controller. When
activated by a thermostat function, there will always be an approximate 10-second turn-on delay and a 1-
minute turn-off delay.
•
Stat terminal block "G" directly activates this blower on/off delay and relay function to the
fan center "G".
•
Tab "G1" can bypass this delay function.
•
Stat "W" or HP stat "Y" also activates this blower function when in off-peak or non-standby
mode. Whenever the system is forced to standby, this blower function will timeout and the
blower is controlled by the furnace itself. This puts the gas furnace speed back in the "hands"
of the gas furnace and also keeps the blower from falsely operating during load control (for
some heat pump stats this may not be the case and may be a load control discomfort
situation). This is another reason why WF-EZ3 and basic 4-wire stat are a better choice (also
see page 24).
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 controller 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°
11/01/2007
OPERATION INDICATORS
WarmFlo II Controller
21
HI320
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