Specifications
Damper Modulation — The monitor thermostat modu-
lates the zone damper depending on zone temperature,
supply-air temperature, zone demand, and mode. The moni-
tor thermostat modulates the zone damper to the Maximum
Damper Position when zone demand is greater than 1.5° F
or greater and duct temperature can satisfy demand. When
zone demand is less than 1.5° F, the monitor thermostat modu-
lates the zone damper closed (proportional to zone demand).
When the monitor thermostat is chosen as the reference
zone, it modulates the zone damper to the Maximum Damper
Position. The monitor thermostat operates at the maximum
airflow condition until it is no longer the reference zone.
NOTE: When the Ventilation Position is set to 0 and the moni-
tor thermostat is in Occupied mode, regardless of zone de-
mand, the monitor thermostat will not close the zone damper
beyond the Minimum Damper Position.
If the zone damper supply air temperature is within the
temperature range of 65 to 80 F, the monitor thermostat modu-
lates its zone damper to the damper ventilation position.
If the zone damper supply air temperature is not within
the temperature range of 65 to 80 F, the monitor thermostat
modulates its zone damper to the Minimum Damper
Position.
MAXIMUM DAMPER POSITION — The maximum damper
position determines the maximum amount that the damper
will open during modulation. To configure the option, set
category 3, option 1. Use the left set point buttons to raise
or lower the Maximum Damper Position setting. The range
of values is 15 to 8, where 15 is fully open and 8 is half
open. The default is 15.
MINIMUM DAMPER POSITION — The minimum damper
position determines the minimum amount that the damper
will close during modulation. To configure the option, set
category 3, option 2. Use the left set point buttons to raise
or lower the Minimum Damper Position setting. The range
of values is 0 to 7, where 0 is fully closed and 7 is half open.
The default is 0.
VENTILATION POSITION — If the zone has no system
mode and the damper supply air temperature is within the
temperature range of 65 to 80 F, the monitor thermostat modu-
lates its zone damper to the damper ventilation position. To
configure the option, set category 3, option 3. Use the left
set point buttons to raise or lower the Ventilation Position
setting. The range of values is 0 to 7, where 0 is fully closed
and 7 is half open. The default is 5.
ZD/RD ACTUATOR — If the ZD/RD Actuator option is set
to ON, the monitor thermostat is configured to operate a model
ZD/RD or MA-08 actuator. The actuator is shipped from the
factory already installed on its own damper. If the ZD/RD
Actuator option is set to OFF, the monitor thermostat is con-
figured to operate a model HTA (high torque) actuator.
To configure the ZD/RD Actuator option, set category 3,
option 4. Use the left set point buttons to toggle the setting
to ON or OFF. The default is OFF.
COUNTERCLOCKWISE OPEN DAMPER MODULA-
TION — If the Counterclockwise Open Damper Modula-
tion option is set to ON, the monitor thermostat will modu-
late the damper counterclockwise to move it into the open
position. If the Counterclockwise Open Damper Modulation
option is set to OFF, the monitor thermostat will modulate
the damper clockwise to move it into the open position.
To configure the Counterclockwise Open Damper Modu-
lation option, set category 3, option 5. Use the left set point
buttons to toggle the setting to ON or OFF. The default is
ON.
The following VVTt zone dampers require counterclock-
wise rotation to modulate the damper to an open position:
• Model ZD Round Zone Damper
• Model RD Rectangular Zone Damper
SUPPLEMENTAL HEAT
The operation of supplemental heat for each zone is con-
trolled by the each zone controller. The monitor thermostat
works in conjunction with the zone controller to:
• lock out supplemental heat based on outside air
temperature
• operate central heat when zone supplemental heat is
energized
• operate the supply air fan when necessary when zone supple-
mental heat is energized
NOTE: Supplemental heat options must be correctly con-
figured at both the monitor thermostat and at the individual
zone controllers before the supplemental heat capability will
function correctly.
Supplemental Heat Lockout — The monitor ther-
mostat can be configured to send a Supplemental Heat Lock-
out command which will not allow operation of supplemen-
tal heat. When the outside air temperature is at or above the
Heating Lockout Temperature Set Point and the Supplemen-
tal Heat Lockout option is set to ON, supplemental heat will
not be available to the system zone controllers.
When the Supplemental Heat Lockout option is set to OFF,
supplemental heat operation will always be available to the
zone controllers associated with the system of the monitor
thermostat.
To configure the Supplemental Heat Lockout option, set
category 6, option 1. Use the left set point buttons to toggle
the setting to ON or OFF. The default is OFF.
Heating Lockout Temperature Set Point — The
Heating Lockout Temperature Set Point defines the outside
air temperature set point for the Supplemental Heat Lockout
and System Heating Mode Lockout functions. To configure
the option, set category 4, option 14. The range of values is
10 to 80 F in 1° F increments. The default is 60 F. Use the
upper and lower set point buttons to raise or lower the value.
Supplemental Heat Callers — When the Supple-
mental Heat Callers option is set to ON, the monitor ther-
mostat considers the zone controllers associated with its sys-
tem as Zone Heating Callers when their zone supplemental
heat source is energized.
When the Supplemental Heat Callers option is set to OFF,
the monitor thermostat does not consider the zone control-
lers associated with its system to be Zone Heating Callers
when their zone supplemental heat source is energized.
To configure the Supplemental Heat Callers option, set
category 6, option 2. Use the left set point buttons to toggle
the setting to ON or OFF. The default is OFF.
By giving the zone controllers direct control of individual
zone heat and access to the central heat of the HVAC equip-
ment, the Supplemental Heat Callers option allows a supple-
mental heat source to be sized for either total zone load, or
to offset perimeter transmission losses.
For system applications that have simultaneous heating
and cooling demand on design heating days, zone supple-
mental heat can be sized for the total zone load. When the
Supplemental Heat Callers is set to OFF, the zone control-
lers will use supplemental heat to satisfy zone heating de-
mands while the equipment remains available to satisfy cooling
demand at other zones in the system.
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