Valent Controls IOM 65 IOM-C1-0616
Part Number 474626
space relative humidity is greater than the space relative humidity setpoint AND the space dewpoint is above
45°F.
4.2. The controller shall perform the following functions in the dehumidification mode.
A. Modulate cooling capacity to maintain the coil leaving air temperature setpoint.
B. Modulate hot gas reheat valve to maintain the supply air temperature setpoint.
5. COOLING & REFRIGERATION – AIR COOLED PACKAGED DIRECT EXPANSION
5.1. In cooling mode the controller shall perform the following functions.
A. Enable the Digital Scroll™ compressor and modulate capacity to maintain supply air temperature setpoint.
B. If the Digital Scroll™ compressor is not able to maintain the supply air temperature, additional fixed stages of
capacity shall be enabled and the Digital Scroll™ shall continue to modulate to maintain the supply air
temperature setpoint.
C. If the combination of multiple compressors provides lowers the supply air temperature below its setpoint, the
controller shall disable one or more fixed stages of capacity.
5.2. In dehumidification mode the controller shall perform the following functions.
A. Enable a fixed stage of capacity to maintain or exceed the evaporator coil leaving air temperature setpoint.
B. Modulate the hot gas reheat valve to maintain the supply air temperature setpoint.
C. Enable an additional fixed stage of capacity to maintain or exceed the evaporator coil leaving air temperature
setpoint (310 and 350 casings only).
D. Enable the Digital Scroll™ compressor to maintain the evaporator coil leaving air temperature setpoint.
E. Enable the final fixed stage of capacity and modulate the Digital Scroll™ to maintain the evaporator coil leaving
air temperature setpoint (310 and 350 casings only).
5.3. [Standard Condensing Performance] To maintain a consistent condensing temperature in cooling and
dehumidification mode, the controller shall perform functions.
A. Enable a single bank of condensing fans to maintain optimum condensing temperatures.
B. As head pressure rises, a mechanical switch shall enable additional condensing fans as needed to maintain
optimum condensing temperatures.
C. As head pressure lowers, individual condensing fans shall disable condensing fans maintain optimum
condensing temperatures.
5.4. [Active Head Pressure Control 1.0] To maintain a consistent condensing temperature in cooling and dehumidification
mode, the controller shall perform functions.
A. Enable and modulate single bank of condensing fans with a variable frequency drive to maintain a condensing
temperature of 110°F.
B. As head pressure rises, a mechanical switch shall enable additional condensing fans and first bank of
condensing fans shall modulate to maintain a condensing temperature of 110°F.
C. As head pressure lowers, individual condensing fans shall disable condensing fans first bank of condensing
fans shall modulate to maintain a condensing temperature of 110°F.
5.5. [Active Head Pressure Control 2.0] To maintain a consistent condensing temperature in cooling and dehumidification
mode, the controller shall perform functions.
A. Enable and modulate all condensing fans with EC motors at the same speed to maintain a condensing
temperature of 110°F.
6. COOLING & REFRIGERATION – AIR SOURCE HEAT PUMP
6.1. In cooling mode the controller shall perform the following functions.
A. Enable the Digital Scroll™ compressor and modulate capacity to maintain supply air temperature setpoint.
B. If the Digital Scroll™ compressor is not able to maintain the supply air temperature, additional fixed stages of
capacity shall be enabled and the Digital Scroll™ shall continue to modulate to maintain the supply air
temperature setpoint.
C. If the combination of multiple compressors provides lowers the supply air temperature below its setpoint, the
controller shall disable one or more fixed stages of capacity.
6.2. In dehumidification mode the controller shall perform the following functions.
A. Enable a fixed stage of capacity to maintain or exceed the evaporator coil leaving air temperature setpoint.
B. Modulate the hot gas reheat valve to maintain the supply air temperature setpoint.
C. Enable an additional fixed stage of capacity to maintain or exceed the evaporator coil leaving air temperature
setpoint (310 and 350 casings only).
D. Enable the Digital Scroll™ compressor to maintain the evaporator coil leaving air temperature setpoint.
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