BLUE M
Blue M - - DC 146 Series Industrial Ovens, Models DC, DCW, DCI, DCC
Page 52
10.0 COOLING SYSTEMS & CONTROL
10.1 Cooling with Ambient Air – Model DC / DCW
Cooling in Models DC and DCW can be achieved by opening the air intake and exhaust dampers with the
heating system turned off. Fresh ambient air will mix with circulating process air to cool the product. With
both dampers fully open and the heating system turned off, the oven can be cooled from your process
operating temperature to around 15° above ambient temperature. Maintaining temperatures around ambient
is difficult due to heat generated by air friction with the circulation blower wheel.
The optional Belimo Model NMB Motorized Damper Actuator may be employed to automatically open and
close the air intake and/or exhaust damper(s). The air intake actuator is installed at the rear of the chamber
with a special damper connecting rod assembly that attaches to the top flange of the damper blade. The air
exhaust actuator connects to the exhaust damper on the side of the exhaust port. Either a manual switch, a
controller Event Output, or a controller 4-20 ma proportioned type signal is used to activate the actuator
motor(s).
10.2 Cooling with Water-Cooled Coil - Optional
For enhanced cooling, or when the chamber is sealed as in the Model DCI and Model DCC, an aluminum
finned water cooled coil is used. The coil is located in the conditioning plenum. Circulating process air is
cooled as it flows through the coil. A city water type supply is required with a maximum temperature of 75° F.
It is important to remember to pipe the drain line to an open bell-type drain.
WARNING! Severe burn hazard. The use of the cooling coil to rapidly cool a high temperature
oven (+100° C) will initially result in the emission of extremely hot steam from the drain line. This
steam can cause severe burns. Stay clear from drain when steam is emitted.
Cooling Control:
With the standard non-profiling type controller, a Cooling Switch located on the main control panel is
normally used to energize a Water Cooling solenoid valve to permit cooling water to flow through the coil.
An optional Cooling Event Output with the non-profiling controller may also be used to energize the solenoid
valve. This type of output is provided standard with profiling type controllers.
WATER-COOLED COOLING COIL
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