Valent Controls IOM 44 IOM-C1-0616
Part Number 474626
Enable Compressor 3 Ambient Lockout
If enabled, compressor 3 will not be allowed to
run below the Outdoor Air Temperature set by
Compressor 3 Ambient Lockout.
Enable Compressor 4 Ambient Lockout
If enabled, compressor 4 will not be allowed to
run below the Outdoor Air Temperature set by
Compressor 4 Ambient Lockout.
Enable Occupancy Auto Mode
If set to Occ Auto, the unit will only enable the
supply fan when there is a call for Occupied
Heating Occupied Cooling when occupied. If set
to Occ On, the supply fan will run continuously in
when the unit is in Occupied mode.
Enable Winter Ramp
Enables and disables the Winter Ramp function.
Exhaust Air Temperature
The temperature of the exhaust air, as
measured with a 10K Type-III thermistor factory
installed in the exhaust airstream. The sensor is
wired to U2 on the DDC2 I/O module.
Exhaust Fan Configuration
Indicates whether exhaust fans are present as
well as what control sequence is selected.
Exhaust Fan Enable Damper Position
The percent open that the Outdoor Air Damper
must be before the exhaust fan is enabled
(Default 15%).
Exhaust Fan Maximum Speed
The maximum requested speed for the exhaust
fan VFD, as a percentage of maximum possible
speed. For all exhaust fan sequences, the VFD
will not be controlled above this maximum
speed.
Exhaust Fan Minimum Speed
The minimum requested speed for the exhaust
fan VFD, as a percentage of maximum possible
speed. For all exhaust fan sequences, the VFD
will not be controlled below this minimum speed.
Exhaust Fan Offset
Displays and edits the offset of the commanded
supply fan VFD speed for the exhaust fan when
Exhaust Fan Tracks Supply Fan is selected. The
exhaust fan can be slowed by setting this point
toward -20% and accelerated by setting this
point toward 20%.
Exhaust Fan Output
Indicates whether the exhaust fan command is
currently on or off. This comes from DO1 on the
DDC2 I/O module.
Exhaust Fan Reaction Speed
Determines how fast the exhaust fan will react to
a change in space pressure. Allows some PID
tuning should the exhaust fan “hunt.”
Exhaust Fan Speed
Displays the defined speed for the exhaust fan.
The rooftop unit includes a variable frequency
drive (VFD) for the exhaust fan motor. In
constant volume operation, the speed of the fan
remains constant at the defined speed (15-
100%, adjustable). At 100%, the fan speed is
determined according to the setup of the VFD
(the design frequency, in Hz). The speed of the
exhaust fan may be slowed for constant volume
operation by adjusting the exhaust fan offset in
the controller (-20–20%). The minimum speed
must not be less than 15% of the design flow to
ensure proper motor operation. The demand
signal comes from AO1 on the DDC2 I/O
module.
Exhaust Fan Status
Reflects the run status of the exhaust fan (U4 on
the DDC2 I/O module). When the input contacts
are closed, the exhaust fan is running. When the
input contacts are open, the exhaust fan is off.
Flat Plate Defrost Setpoint
The exhaust air temperature at which the flat
plate goes into defrost mode to prevent ice from
forming in the heat exchanger.
Furnace Ramp Limit 1
Consult the factory before adjusting this
parameter.
Furnace Ramp Limit 2
Consult the factory before adjusting this
parameter.
Furnace Ramp Release Temp 1
Consult the factory before adjusting this
parameter.
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