Specifications
Equipment Operation — The monitor thermostat op-
eration of the heating, cooling, and auxiliary relays is de-
termined by the system mode and the reference zone demand.
During a system mode, a stage of heating or cooling can-
not be energized in less than 3 minutes after the previous
stage has been deenergized. Once the first stage of heating
or cooling has been energized, it remains on until system
heating or cooling mode is released, unless a temperature
limit is exceeded. The reversing valve relay state, energized
or deenergized, remains constant until a change of system
modes.
AUXILIARY RELAY — The Auxiliary Relay option con-
figures the way the auxiliary relay will be controlled by the
monitor thermostat. When the option is set to 0, there is no
control by the monitor thermostat. When the option is set to
1, the monitor thermostat will control the auxiliary relay based
on the occupancy schedule. When the option is set to 2, the
monitor thermostat will control the auxiliary relay under IAQ
control. When the option is set to 3, the monitor thermostat
will control the auxiliary relay as a reversing valve in a heat
pump system based on system heating or cooling modes. When
the option is set to 4, the monitor thermostat will control the
auxiliary relay to enable or disable economizer control. The
Auxiliary Relay option is set in category 4, option 9. The
default is 0.
If the Auxiliary Relay option is configured to 0 (No Con-
trol) or 1 (Occupancy Schedule) then it can be forced with-
out affecting other relays. If the Auxiliary Relay option is
configured for any other value, if it is forced, all other relays
(C1, C2, H1, H2, FAN) will turn off.
EQUIPMENT OPERATION DURING A SYSTEM COOL-
ING MODE — The monitor thermostat utilizes the relay pack
to energize the reversing valve relay (if option 4.9 is set
to 3) when the system cooling mode is selected. The first
stage of cooling is energized 30 seconds after system cool-
ing mode is selected. The second stage of cooling is ener-
gized, or optimized staging is followed, when the reference
zone cooling demand is 2.0° F or greater. The second stage
of cooling is released when demand drops below 1.0° F. The
first stage of cooling is deenergized when the system cool-
ing mode is released.
EQUIPMENT OPERATION DURING A SYSTEM HEAT-
ING MODE — The monitor thermostat utilizes the relay pack
to deenergize the reversing valve relay (if option 4.9 is set
to 3) when the system heating mode is selected. The first
stage of heating is energized 30 seconds after system heat-
ing mode is selected. The second stage of heating is ener-
gized, or optimized staging is followed, when the reference
zone heating demand is 2.0° F or greater. The second stage
of cooling is released when demand drops below 1.0° F. The
first stage of cooling is deenergized when the system cool-
ing mode is released.
Equipment Operation With Economizer Con-
trol —
The monitor thermostat operation of the heating,
cooling, and economizer relays is determined by the system
mode, the reference zone demand, and the outdoor-air tem-
perature. The Auxiliary Relay option must be set to 4 to con-
figure the monitor thermostat for equipment operation with
economizer control.
During a system mode, a stage of heating or cooling can-
not be energized in less than 3 minutes after the previous
stage has been deenergized. Once a heating or cooling stage
has been energized, it remains on until system demand is
lowered or until system heating or cooling mode is released.
EQUIPMENT OPERATION DURING A SYSTEM COOL-
ING MODE
Outside Air Temperature Greater Than 65 F — The monitor
thermostat utilizes the relay pack to energize the first stage
of cooling after system cooling mode is selected. The sec-
ond stage of cooling is energized, or optimized staging is
followed, when the reference zone cooling demand is 2.0° F
or greater. The second stage of cooling is released when de-
mand drops below 1.0° F. The first stage of cooling is deen-
ergized when the system cooling mode is released.
Outside Air Temperature Greater Than Or Equal To 55 And
Less Than Or Equal To 65 F — The monitor thermostat uti-
lizes the relay pack to energize the outside air economizer
after system cooling mode is selected. When the reference
zone cooling demand is 2.0° F or greater, the first stage of
cooling is energized or optimized staging is followed. The
second stage of cooling is energized when the reference zone
cooling demand is 2.5° F or greater and the first stage of
cooling is energized. The economizer relay and the second
stage of cooling is released when demand drops below
1.0° F. The first stage of cooling is deenergized when the
system cooling mode is released.
Outside Air Temperature Below 55 F — The monitor ther-
mostat utilizes the relay pack to energize the outside air econo-
mizer after system cooling mode is selected. When the ref-
erence zone cooling demand is 2.0° F or greater, the first
stage of cooling is energized or optimized staging is fol-
lowed. The first stage of cooling cannot be energized until
5 minutes after the economizer relay has been energized. The
second stage of cooling is energized when the reference zone
cooling demand is 2.5° F or greater and the first stage of
cooling is energized. The economizer relay and the second
stage of cooling is released when demand drops below
1.0° F. The first stage of cooling is deenergized when the
system cooling mode is released.
EQUIPMENT OPERATION DURING A SYSTEM HEAT-
ING MODE — The monitor thermostat utilizes the relay pack
to energize the first stage of heating after system heating mode
is selected. When the reference zone heating demand is 2.0° F
or greater, the second stage of heating is energized or opti-
mized staging is followed. The second stage of cooling is
released when demand drops below 1.0° F. The first stage of
cooling is deenergized when the system cooling mode is
released.
Optimize Staging — The Optimize Staging function
establishes a pattern for the changing temperature condi-
tions of the reference zone. The monitor thermostat will not
energize the second stage of heating or cooling as long as
conditions are improving.
When the Optimize Staging option is configured to ON,
the monitor thermostat energizes the second stage heating or
cooling if the reference zone temperature trend has not im-
proved for 6 minutes. The 6-minute limit is reset if condi-
tions begin to improve. When the Optimize Staging option
is configured to OFF, the monitor thermostat energizes the
second stage heating or cooling normally.
To configure the Optimize Staging option, set category 4,
option 10. Use the left set point buttons to toggle the option
ON and OFF. The default is ON.
By preventing unnecessary use of the second stage heat-
ing or cooling, the Optimize Staging option allows the heating/
cooling equipment to operate more economically without
sacrificing individual zone comfort.
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