Reznor ZQYRA Unit Installation Manual - Manual (Page 28)

Form I-ZQYRA P/N 260414R5, Page 28
TYPE 6 - I want to
control the unit using a
VOC Sensor plus Keyed
Hand/Off/Auto Switch.
Control Option CN7C, Indoor Air Quality Sensor (VOC 0-100%) with Hand/Off/Auto
Switch, offers the option of allowing the unit to be started/stopped automatically based
on VOC setpoint, manually started, and manually stopped.
Sequence: This control option provides a wall-mounted VOC sensor that is wired to
AI-6. The option also provides a three-position, keyed manual switch that is wired to
the digital input. The three-position switch provides “auto”, “manual on”, and “manual
off” modes. When the switch is in the auto mode, the sensor is powered, the digital
start/stop input is closed, and the system monitors the VOC levels. When the level is
above the setpoint, the unit is on. When the level is below the setpoint, the unit is off.
When the switch is in “manual on” mode, the digital input is closed, the sensors are
electrically disabled, and the unit is on. When the switch is in the “manual off” mode,
the digital input is open, the sensors are electrically disabled, and the unit is off. NOTE:
If the sensor fails, the fail safe is for the unit to run.
Required Setpoint Settings: Occupancy - Type 6
CN Option - CN7C
Senosr - VOC
HOA Input - Off/Hand/Auto
VOC Level - Current Reading
VOC Setpoint - [60]
Off Diff - [15]
Minimum Run Time - [5 minutes]
Alarm - [Enable] or Disable
TYPE 7 - I want to
control the unit using a
Digital Input (DI-3) but
allow the VOC or CO
2
sensor to override DI
when levels are above
setpoint.
Control Option Configuration Type 7: This configuration allows for the Digital Input
(DI-3) to be the primary occupancy control but then allow a VOC or CO
2
sensor to over-
ride the DI when levels are above the setpoint. This option shows under the required
setpoint setting to be configured as CN5 but can be used in conjunction with CN5,
CN7D, or any field-supplied contact closure.
Sequence: This figuration type allows the unit to be started/stopped based on the
contact closure that is wired to the digital input (DI-3). When the input is closed the unit
is “on”, and when the input is open the unit is “off”. This configuration also allows the
unit to monitor the CO
2
or VOC level and override the unit “on” when the level is above
the setpoint.
Required Setpoint Settings: Occupancy - Type 7
CN Options - CN5
Sensor Type - [C02] or VOC (Sensor in CN7B or
CN7C or field-supplied sensor.)
CO
2
or VOC Level - Current Reading
CO
2
or VOC Setpoints - [800] / 60
CO
2
or VOC Off Diff - [50] / 15
Minimum Run Time - [5 minutes]
Alarm - Enable or [Disable]
TYPE 8 - I want to
control the unit using
an internal or Building
Automation Schedule
but allow the VOC or
CO
2
Sensor to override
the schedule and DI
when levels are above
setpoint.
8.2 Sequence of
Operation
(cont’d)
8.0 Controls
(cont’d)
Control Option Configuration Type 8: This configuration allows for an internal time
clock or building automation schedule to be the primary occupancy control but then
allows for the Digital Input (DI-3) to override the schedule. This configuration also allows
for a VOC or CO
2
sensor to override the schedule and the DI when levels are above the
setpoint. This option shows under the required setpoint setting to be configured as CN5
but can be used in conjunction with CN5, CN7D, or any field-supplied contact closure.
Sequence: This configuration type allows the unit to be started/stopped based on the
time of day schedule either done locally at the controller or through the Building Auto-
mation System. This configuration also allows the DI-3 to be configured to override the
unit schedule. When the DI override point is set to “Ovrd On”, the DI point will override
the unit to an “Occupied Command” whenever the DI is closed. This can be used to
provide an “override on” timer or switch, an occupancy sensor override, or any other
connection to allow the system to be turned on from the space when the unit is in the
unoccupied condition. When the DI Override point is set to “Ovrd Off”, the DI point will
override the unit to an “Unoccupied Command” whenever the DI is open. This can be
used to provide an “override off” switch to allow the system to be turned off from the
Unit Occupancy Control Options by Controller Setting TYPE (cont’d)