meaning that set points are not affected by the programmed
schedule. While in vacation mode, the system provides tempera-
ture and humidity protection for the home in all seasons, but not
comfort.
VACATION SET POINTS
A special set of temperature and humidity set points exists which
are active in vacation mode. They are adjustable by the home-
owner, are exclusively for vacation mode, and are remembered
from 1 vacation selection to the next. These set points will be
higher for cool and dehumidify and lower for heat and humidify
than those of occupied mode.
VACATION HUMIDIFICATION
Normal humidify is available, using vacation set points. Humidi-
fication by fan only is not available as vacation selection. Auto
humidification is available, adjusting its set point with outdoor
temperature the same as when occupied. The maximum humidity
set point can be adjusted separately from the occupied value, but
it must always be less than occupied value. This allows humidi-
fication to track outdoor temperature identically, whether occupied
or vacation, but allows maximum humidification to be less when
unoccupied. Vacation humidification can be turned off indepen-
dently of occupied humidification.
VACATION DEHUMIDIFICATION
Normal Dehumidify, Cool to Dehumidify, and Dehumidify OFF,
are all available in vacation mode, and selection of 1 of these can
be different from that of occupied. Vacation dehumidification
selection and set points are remembered the next time vacation is
used.
Cool to dehumidify operates slightly differently, allowing the
home to be cooled to as low as 70°F when trying to achieve
dehumidify set point. The balance between dehumidify and
temperature set point adjustments is 1 percent set point increase
per degree of overcooling for temperatures below 76°F. For
example, at 74°F dehumidify set point is raised 2 percent, and at
72°F dehumidify set point is raised 4 percent. At temperatures
above 76°F, dehumidify set point is not changed.
Under no conditions will the house be cooled below 70°F,
regardless of dehumidify demand.
OPERATIONAL INFORMATION
A.
Five-Minute Compressor Timeguard
This timer prevents compressor from starting unless it has been off
for at least 5 minutes. It can be defeated for 1 cycle by
simultaneously pressing FAN mode button and INCREASE TEM-
PERATURE button.
B.
Fifteen-Minute Cycle Timer
This timer prevents the start of a heating or cooling cycle until at
least 15 minutes after the last start of the same cycle. Its function
is to assure that equipment is not cycled more than 4 times per hr.
This timer is defeated for 1 cycle when desired temperature is
manually changed. It can also be defeated for 1 cycle by
simultaneously pressing FAN mode button and INCREASE TEM-
PERATURE button.
C.
Fifteen-Minute Staging Timer
In multistage heating or cooling, this timer prevents any higher
stage from turning on until preceding stage has been on for 15
minutes. This timer is defeated if temperature error is greater than
5°F (usually due to a large change in desired temperature).
D.
Three-Minute Minimum On Time
In normal operation, when a stage turns on, it will not turn off for
a minimum of 3 minutes. If the set point is changed, this timer is
automatically canceled, allowing the equipment to turn off imme-
diately when the demand is removed.
E.
Heat/Cool Set points (Desired Temperature)
A minimum difference of 2° is enforced between heating and
cooling desired temperatures. This is done by allowing 1 setting to
"push" the other, to maintain this difference. This difference is
adjustable via Configuration Option 14.
F.
Equipment ON Indicators
When cooling equipment is on, a COOL icon preceded by a small
triangle is displayed below cool set point. While cooling equip-
ment turn on is delayed by a staging or cycle timer, triangle will
flash. The same is true for HEAT icon and its preceding triangle
located under heat set point. These 2 arrows are also used to
indicate state of humidify and dehumidify outputs. See next
section.
G.
Humidify and Dehumidify Indicators
The humidity screen (selected by pressing the HUMIDITY button)
uses the same triangles referenced in the above paragraph to
indicate the state of the HUM and DHUM outputs. When
humidification or dehumidification is active, the triangle under its
set point is turned on.
H.
Humidify/Dehumidify Output ON Indicators
Within humidity select screen (selected by Humidity button and
indicated by "hu" or "dhu" on clock display), triangle under
humidity set point will be on while humidify output is on. Triangle
under dehumidify set point will be on while dehumidify output is
active (turned off, because this output is reverse logic).
I.
Auto Changeover
When auto changeover mode is selected, a change from heat to
cool (or vice versa) will not occur until an opposite mode demand
has existed for 20 minutes. If set point is changed, 20-minute
requirement is deleted.
J.
Emergency Heat Mode
When Thermidistat Control is configured as a heat pump and
emergency heat is selected, all Y signals are locked out, and W
becomes energized upon a call for heat.
→
TABLE 6—WIRING DIAGRAM REFERENCE CHART
EQUIPMENT SELECTION
SINGLE-SPEED
AIR CONDITIONER
TWO-SPEED
AIR CONDITIONER
SINGLE-SPEED
HEAT PUMP
TWO-SPEED
HEAT PUMP
Typical Fan Coil
Fig. 3
Fig. 4
Fig. 5
Fig. 6
FK4C Fan Coil
Fig. 7
Fig. 8
Fig. 9
Fig. 10
1-Stage Furnace
Fig. 11
Fig. 12
Fig. 13
Fig. 14
2-Stage Furnace
Fig. 15
Fig. 16
Fig. 17
Fig. 18
Variable-Speed 2-Stage
Non-Condensing Furnace
Fig. 19
Fig. 20
Fig. 21
Fig. 22
Variable-Speed 2-Stage
Condensing Furnace
Without DE Connection
Fig. 23
Fig. 24
Fig. 25
Fig. 26
Variable-Speed 2-Stage
Condensing Furnace
With DE Connection
Fig. 27
Fig. 28
Fig. 29
Fig. 30
—10—
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