06/07/2016 11
EI508
OPERATIONAL INFORMATION
In order for the installer to completely understand the WF II functions and operational sequence it is
recommended to thoroughly read and understand the information below. This knowledge can help in
determining settings that can be set according to the end customers needs.
Normal Heating Operation
– Whenever the WarmFlo II Y tab is at 24 volt (with reference to “C”), the
WarmFlo II controller begins turning on the Electro-Mate elements (assume outdoor temp. is below disable
value) and automatically controls the warm air temperature as sampled by the warm air sensor (ST). However,
if added heat is
not
required, no element power is used.
Depending upon Electro-Mate model, the heating section may have one, two, three, or four stages. Stage
1 is pulse modulated (approximate 10-second cycle) based upon the WarmFlo II controller automatic
requirement. Stages 2, 3, and 4 are turned on and off with a relay. However, Stage 2 is only used when
needed by the WarmFlo II supply air temperature calculations. When the warm air sensor is calling for
more than the heat pump and Stage 1 100% output, Stage 2 turns on. Stage 1 may not necessarily remain
at 100%, but is modulated downward to meet the requirements of the warm air sensor.
Also on the next call for heat, the WarmFlo II controller remembers what stages were on and starts at that
point. A clamp-on amp meter at the service input can be used to “visualize” the Stage 1 modulation
and/or Stages 2, 3, and 4 functions.
Efficiency
– the characteristic of a heat pump dual heat system is the heat pump’s ability to deliver warm
air at efficiencies greater than 100%. Gas and oil systems are always less than 100% (60% through 90%),
resistance electric (Electro-Mate) is always exactly 100%, but the heat pump is always at least 100% (-
20°F) or greater, up to about 200% for air source.
Realizing it is to the user’s advantage to run the heat pump either continuously or at the longest possible
thermostat call cycles. This is contrary to the basic understanding of most users. However, realizing
again the heat pump is a device that delivers greater than 100%, this system can only deliver greater than
100% if it’s running, let it run. Because of the WarmFlo design concept and its internal “brain” the heat
loss curve (diagonal lines, above) allows the compressor to operate with a minimal amount of electric
resistance supplement or temperature boost.
Where should I set the efficiency (center) dial?
– As you can visualize from the heat loss curve (Figure
1), the lower the setting, the flatter the curve, the less electric resistance is added to the heat pump
compressor warm air. Therefore, the efficiency knob setting is based upon comfort and efficiency. The
lower the setting the higher the overall operating annual efficiency, the higher the setting the warmer the
air at the register.
Heat loss curve
– within the “brain” of the WarmFlo controller is a relationship of supply temperature to
outdoor temperature measurement. As it gets colder outside, the higher the supply temperature in order to
properly overcome the heat loss within the structure. This is the diagonal line between 65° outdoor and
maximum Btu/h (heat loss) at the coldest outdoor temperature. The slope of this line or the exact warm
air position at the coldest temperature is established by the “efficiency” adjustment knob or dial.
