Aprilaire 1830 User Manual download pdf (Page 5)

Application Sheet 4 – Two Zone using Internal Control

Parts Needed (additional

parts may be required):

__ Model 1830/1850/1870

__ Insulated duct

__ Thermostat wire

__ Duct fittings & hardware

__ 20A Outlet (1870 only)

__ Drain pan and float switch (if

required)

__ Grilles

__ 4522 Damper Kit (includes:

2 – 8” dia N.O. dampers,

2 – 8” dia N.C. dampers and

one 40VA, 24VAC plug-in

transformer)

Figure 1

Duct/Damper Layout with

Whole House as Primary Zone

Figure

Duct/Damper Layout with

Basement as Primary Zone

Figure

Wiring

Sequence of Operation

Adjust the relative humidity (RH) setting on the

dehumidifier control; this will be the setting for both the

Primary and Secondary Zone. Once an hour, the

dehumidifier will “sample” the air in the Primary Zone.

If there is no need for dehumidification in the Primary

Zone the dehumidifier will then sample the air in the

Secondary Zone.

When sampling in the Primary Zone the dehumidifier

will energize the dampers and then turn on its blower

(and the HVAC System blower if wired as shown in

Figure 3), to measure the RH of the air. If the RH of the

air is above the setting, the compressor will turn on. If

the Primary Zone does not need dehumidification, the

dampers are de-energized and the HVAC System Blower

(if on) is turned off while the dehumidifier blower

continues to run to sample the air in the Secondary

Zone. If the RH of the air in the Secondary Zone is above

the setting, the compressor will turn on.

Set Up the Dehumidifier for Zoning

1. With “OFF” showing on the control, press the Mode button for 3 seconds to enter the Installer Set Up menu

2. Press the Mode button until “ZONE DISABLED” appears.

3. Press the Up or Down button to change to “ZONE ENABLED”.

4. Press the Mode button repeatedly until “DONE” shows on the display.

HVAC

EQUIPMENT

THERMOSTAT

EXISTING WIRE

NEW WIRE

DH DH

HVAC EQUIP

Gh Rf Cf Gs W Y

FLOAT

SWITCH

DEHUMIDIFIER

CONTROL BOARD

N.C. DAMPERS

120

VAC

20 VA (MIN.)

TRANSFORMER

N.O. DAMPERS

HVAC EQUIPMENT

NORMALLY

CLOSED

DAMPER

NORMALLY

CLOSED

DAMPER

NORMALLY

OPEN DAMPER

NORMALLY

OPEN DAMPER

TO/FROM SECONDARY ZONE

TO BE DEHUMIDIFIED

TO/FROM PRIMARY ZONE TO BE

DEHUMIDIFIED

HVAC EQUIPMENT

NORMALLY

OPEN DAMPER

NORMALLY

OPEN DAMPER

NORMALLY

CLOSED

DAMPER

NORMALLY

CLOSED

DAMPER

TO/FROM PRIMARY ZONE

TO BE DEHUMIDIFIED

TO/FROM SECONDARY ZONE TO

BE DEHUMIDIFIED

1 2 3 4 5 6 7 8

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Aprilaire 1830 User Manual Page 5

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