Simple Dehumidification - Honeywell LCBS Applications Manual

11. Simple Dehumidification

DEHUMIDIFICATION – SIMPLE
BUILDING NAME
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
LCBS
CONTROLLER
1 2 3 4 5 6 7 8
24 VAC
SYLK BUS
CONTROLLER
POWER
LCBS
CONTROLLER
WALL
MODULE
LCBS CONNECT – INFORMATION
THIS APPLICATION PROVIDES AUTOMATIC CONTROL OF DEHUMIDIFICATION. WE SUPPORT TWO METHODS
OF DEHUMIDIFICATION. FIRST, WE PERFORM STANDARD DEHUMIDIFCATION WITH CONNECTED COOLING
AND HEATING EQUIPMENT. IF DEHUMIDIFICATION LIMIT IS EXCEEDED AT ANY TIME, OCCUPIED OR
UNOCCUPIED TIMING, COOLING AND HEATING IS ENABLED AND OPERATED CONCURRENTLY. HEATING
WILL CYCLE TO ATTEMPT TO DEHUMIDIFY. WHEN HYSTERESIS IS OBSERVED AND HUMIDITY FALLS BELOW
DEHUMIDIFICATION LIMIT, HEATING AND COOLING ARE CYCLED OFF. IF A CALL FOR COOLING STILL EXISTS,
COOLING CONTINUES TO OPERATE BASED ON COOLING SETPOINT. SECOND, AN LCBS CONNECT
CONTROLLER OUTPUT CAN BE PROGRAMMED TO CONTROL A DEHUMIDIFICATION UNIT LIKE A DX DEHUMIFIER
OR DESSICANT SYSTEM. IF A CALL FOR DEHUMIDIFICATION EXISTS, THE SELECTED SYSTEM OPERATES
INDEPENDENTALY OF LCBS CONTROL FUNCTIONS. THE CONFIGURER CAN ALSO SET A "RUN ON TIMER"
THAT OPERATES AFTER THE CALL FOR DEHUMIFICATION ABATES, UP TO 15 MINUTES.
CVAHU RTU NAME
9 10 11 12 13 14 15 16 17 18 19 20
DEHUMID
START
CIRCUIT
(METHOD #2)
39
LCBS CONNECT SOLUTION
DATE
COOL 1
COOL 2 COOL 2
FAN
HEAT 1
HEAT 2
LCBS CONNECT – COMPONENTS SHOWN
OS# DESCRIPTION
YCRL6438SR LCBS CONTROLLER (WITH WALL MODULE)
C7250A MIXED AIR SENSOR
C7250A DISCHARGE AIR SENSOR
C7400S RETURN AIR ENTHALPY SENSOR
C7400S OUTDOOR AIR ENTHALPY SENSOR
M7215A ECONOMIZER ACTUATOR
AT40 TRANSFORMER(S)
HVAC SYSTEM
24 VAC POWER
EXISTING
TRANSFORMER
MCR36718
31-00118EFS—01