Valent Controls IOM 47 IOM-C1-0616
Part Number 474626
Outdoor Air Enthalpy
Displays the value of the outdoor air enthalpy,
as calculated using the factory-installed outdoor
air relative humidity sensor and factory-installed
outdoor air temperature sensor.
Outdoor Air Relative Humidity
The level of relative humidity from the outdoor
air is measured by the field-installed RH sensor
located in the outdoor air inlet hood. The sensor
provides a 0-10 VDC signal to the controller,
which is wired to U5 on the DDC1 I/O module.
Outdoor Air Temperature
The temperature of the outdoor air is measured
by the factory-installed sensor located in the
outdoor air inlet hood. The sensor is wired to U3
on the DDC1 I/O module.
Outdoor Dewpoint
The dewpoint as calculated from the outdoor
temperature and humidity values.
Outdoor Dewpoint Setpoint
If the space humidity sensor is absent or not
connected, the unit will control humidity based
on the Outdoor Dewpoint Setpoint. If the
measured outdoor air dewpoint is greater than
the Outdoor Dewpoint Setpoint, the unit will
stage into dehumidification. If the outdoor air
dewpoint is less than the Outdoor Dewpoint
Setpoint minus the Outdoor Air Dewpoint
Deadband, dehumidification is disabled.
Overcool Offset
Defines the maximum number of degrees the
space temperature can reach below setpoint
before cooling is disabled. The space
temperature must be below setpoint by this
amount for 10 minutes before the cooling is
disabled.
Preheat Ambient Setpoint
If the outdoor air temperature is at or below this
temperature, the preheater will be enabled.
Preheat Output
Indicates whether the preheater is currently
enabled. This is wired to DO10 on the DDC1 I/O
module.
Ramp Release Delay
Consult the factory before adjusting this
parameter.
Refrigerant Pressure Circuit A
The refrigerant pressure, in psi, of Circuit A. This
is wired to U3 on the DDC 2 I/O module.
Refrigerant Pressure Circuit B
The refrigerant pressure, in psi, of Circuit B. This
is wired to U8 on the DDC2 I/O module.
Space Dewpoint
The calculated dewpoint of the space, based on
the space temperature and humidity values that
are currently in control.
Space Dewpoint Dehumidification Disable Setpoint
If the Space Dewpoint falls below this value,
then the unit will exit dehumidification until the
dewpoint in the space is greater than this value
once again. This prevents overcooling of the
space.
Space Enthalpy
Space enthalpy is calculated based on the field-
installed space temperature sensor (factory
provided, if ordered) and field-installed space
humidity sensor (factory provided, if ordered).
Space Pressure High Limit Setpoint
This is the highest allowable static pressure. If
the static pressure exceeds this limit, the fans
and the unit will shut down to prevent extreme
over-pressurization of the space. Default is
0.200 InWc.
Space Relative Humidity
Space RH is measured by an optional field-
installed relative humidity sensor located in the
space. The sensor provides a 0-10 VDC signal
to the controller wired to U6 on the DDC1 I/O
module.
Space Relative Humidity Occupied Deadband Setpoint
Adjusts the threshold the unit uses to determine
when the space does not need dehumidification.
Space dehumidification is not requested when
the space relative humidity is less than
(Occupied Space Humidity Setpoint – Occupied
Space Humidity Deadband Setpoint).
Space Relative Humidity Setpoint
The relative humidity level that the system
should maintain in the space.
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