SignatureStat t Thermostat
Page 25
Fan AutoIn COOLING, the indoor blower cycles with calls for Cooling.
In HEAT, and with the thermostat set for standard, the indoor blower (G)
cycles with a call for first stage of heating. Note the indoor blower and com-
pressor stay on when the second stage of heating activates.
GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > STANDARD−COMP=ON
When in add−on heat, the indoor blower (G) again cycles with the call for
first stage heat. Note that the compressor turns off (comp=off) when the
second stage of heat activates, but the indoor blower remains on.
GO TO: MENU > INSTALLER SETTINGS > SYSTEM SETUP > ADD ON−COMP=OFF
Fan ONThe indoor blower is ON continuously regardless of whether
the heating or cooling equipment is running.
Thermostat Off" ModeIn this mode, the heating and cooling and
H/D terminals are inactive. The O or B terminal is active. This is determined
by the last state of O/B. For example, if the mode goes from Heat (B active)
to Off, then B will be active in the Off mode. Default on power−up is B active.
The G terminal may be active if FAN ON is selected from the menu.
System SetupDefault setting is STD (STANDARD−COMP=ON). The
auxiliary heat may be configured for standard or ADD on. Standard means
the auxiliary stage supplements the compressor stage (the compressor
and auxiliary are on at the same time). Add−on (ADD ON−COMP=OFF)
means that the compressor turns off before the auxiliary turns on. When the
auxiliary turns off, the compressor may turn on again.
Low Balance PointDefault setting is 25°F. This option will only be
available if an outdoor sensor is installed. If the outside temperature is be-
low the programmed low balance point, then the compressor stage opera-
tion is disallowed. This protects the compressor from operation and dam-
age in cold outdoor temperatures. Also, if the heat pump is not effective at a
low outdoor temperature, then it is more comfortable and efficient to go di-
rectly to the second stage. The options are from −20°F to the high balance
point temperature in 1.0°F steps.
High Balance PointDefault setting is 50°F. This option is only avail-
able if an outdoor sensor is installed. If the outside temperature is above the
high balance point, then the auxiliary heat stage is disallowed. This pre-
vents the expensive auxiliary heat stage from operating, and makes the low
cost heat pump satisfy the call. Both the compressor and auxiliary heat may
not be disabled at the same time by the low and high balance points.
SignatureStatt Humiditrol
®
Logic Diagram
RUN EQUIPMENT
IN NORMAL
HEATING MODE
RUN EQUIPMENT
IN NORMAL
COOLING MODE
DEACTIVATE
ALL
EQUIPMENT
81M SignatureStatt Equipment
Operation with Humiditrol
®
Enabled
NO
IS THERE A
HEATING
DEMAND?
start
IS THERE A
COOLING
DEMAND?YES
IS THERE A
DEHUMIDIFICATION
DEMAND?
YES
NO
NO
YES
IS
COOLSET – HEATSET
> DBND
?
IS INTEMP >
COOLSET – DBND
+2ºF
?
IS INTEMP >
2ºF ABOVE
HEATSET
?
run
Humiditrol
®
LEGEND:
COOLSET = COOLING SETPOINT
DBND = DEADBAND
HEATSET = HEATING SETPOINT
INTEMP = INDOOR TEMPERATURE
YES
NO
IMPORTANT!
HUMIDITROL
®
IS
NOT ALLOWED TO
RUN IF:
S OUTDOOR
TEMPERATURE
IS GREATER
THAN 95ºF
OR,
S INDOOR
TEMPERATURE
IS LESS THAN
65ºF.
NO
YES
YES
NO
Figure 6
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