Robertshaw 9820i Dehumidifier User Manual


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MANUAL INDEPENDENT DEHUMIDIFICATION
If RH rises 2% above RH setpoint, then D, G, and Y1 switch to active. (D becomes de-energized.) In
addition, the unit will operate until one of two requirements are met: Either the temperature decreas-
es 1-1/2F° below the temperature setpoint or the RH decreases to 2% below the RH setpoint.
The resulting state depends on the room temperature at the time the dehumidication is satised. If
the temperature is in the range such that the cooling demand is satised, then Y1 and G turn off with
D. Otherwise there is a cooling demand from the present temperature, and Y and G stay active.
If dehumidication is active with no call for cooling, and cooling becomes active (Room temperature
is above temperature setpoint +0.5° F.), then the thermostat stays in a dehumidication state until the
humidity setpoint has been reached.
Fixed Speed Motor
D = 24 VAC – no call
D = 0 VAC – call
Relay shown in
de-energized state.
No voltage supplied.
D Terminal
Relay Coil
24 VAC
C Terminal
Cool
Control
Board
Fan
Motor
Higher Speed
Lower Speed
Uni-Line Part #
600-293
NOTE: If there is an existing xed speed motor and the dehumidication feature is used, see the
xed speed motor wiring diagram below.
191 E. North Avenue
Carol Stream Illinois 60188 USA
Customer Service Telephone 1.800.304.6563
Customer Service Facsimile 1.800.426.0804
HVACCustomerService@Invensys.com
For Technical Service
Telephone 1.800.445.8299
Facsimile 1.630.260.7243
TechnicalService@Invensys.com
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®
Uni-Line
®
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™
are trademarks of
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may be the trademarks of their respective owners.
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