Aprilaire 2120 Installation Instructions

INSTALL THE AIR CLEANER CONTROL BASE

Position the LED Base on the top of the Air Cleaner. If you have a plastic door latch on the top of the
Air Cleaner position the LED Base right behind the latch (see Diagram 1).
If you don't have a plastic door latch on the top of the Air Cleaner position the LED Base close to the
front edge (see Diagram 2).
Note: Leave 4-1/2" above LED Base to allow for installation of the Air Cleaner Control to LED Base.
Remove fi lter assembly from Air Cleaner Housing before drilling LED Base mounting holes.
LED BASE MOUNTING STEPS:
1. Remove filter assembly from Air Cleaner.
2. Position LED Base on top of Air Cleaner centered as shown in Diagrams 1 & 2.
3. Remove cover from LED Base.
4. Mark the two mounting hole locations and drill 1/8" diameter holes.
5. Assemble the LED Base to the Air Cleaner with screws provided.
6. Replace the cover on the LED Base.

INSTALL THE AIR CLEANER CONTROL

The electronic controls (Figure 1) are used to circulate air through the air cleaner, monitor filter life and
inform the user that the air is being cleaned. Users can turn on the blower for a set period of time or
adjust it so that the blower is on, either as part of a heating/cooling call or blower only, for a set number
of minutes per hour. This requires the Air Cleaner Control to be mounted in an accessible location, and
requires 18-22 gauge (standard thermostat cable) wires to be run between the air cleaner components
and the HVAC components.
THE AIR CLEANER CONTROL CAN BE MOUNTED:
• Option 1 (see below): near the thermostat.
• Option 2 (see opposite side): on the air cleaner in the LED Base.
• Option 3 (see opposite side): near the HVAC equipment.
OPTION 1 – INSTALL THE AIR CLEANER CONTROL NEAR THE THERMOSTAT
1
Run a 3-conductor cable between the LED Base and the low
voltage controls of the HVAC equipment.
2
Remove the cover from the LED Base and wire the LED Base to
the low voltage controls of the HVAC equipment as shown in
Diagram 3. Replace the cover on the LED Base.
3
Remove the backplate from the Air Cleaner Control and install
the backplate near the thermostat. Use the wire opening in the
wall behind the thermostat to make sure there is not a wall
stud between the thermostat and desired mounting location.
4
Run a 5-conductor cable between
the thermostat and Air Cleaner
FIGURE 3
Control.
5
Wire the thermostat to the
Air Cleaner Control as shown
in Diagram 4 or Diagram 5.
Diagram 4 is for standard, single
transformer systems; Diagram
5 is for two-transformer systems
such as radiant heat with forced
air cooling. Replace the Air
Cleaner Control on the backplate.
DIAGRAM 4 – Single Transformer Systems
THERMOSTAT
W
HEATING
Y
COOLING
G
FAN
C
R
SEE NOTE 1
LEGEND
NEW WIRE
EXISTING R C
WIRE
WIRE NUT
AIR CLEANER CONTROL
NOTE 1: IF THE TRANSFORMER COMMON IS NOT AVAILABLE, USE THE SUPPLIED BATTERIES
TO POWER THE AIR CLEANER CONTROL.
NOTE 2: IF THERE IS NO HEAT OR AUXILIARY HEAT OUTPUT WIRED ON THE THERMOSTAT,
JUMPER THE GS AND W TERMINALS ON THE AIR CLEANER CONTROL.
CAUTION
FIGURE 2
1
4
3
5
Wall Stud
DISCONNECT EXISTING WIRE FROM
THERMOSTAT G (FAN) TERMINAL AND
USE WIRE NUT TO CONNECT TO GF
WIRE FROM AIR CLEANER CONTROL
SEE NOTE 2
GF W GS A B
NOT USED
Air Cleaner Control Installation Instructions
Fits Models 2120, 2140, 2200, 2400 & 5000
DIAGRAM 1 – Models with Door Latch
FIGURE 1 – Air Cleaner Control Components
DIAGRAM 3 – Wiring the LED Base to the HVAC Equipment
FURNACE OR AIR
HANDLER
2
HEAT OR AUX.
W1
HEAT
COOLING OR
COMPRESSOR
FAN
90-1367
24
VAC
120
VAC
LEGEND
NEW WIRE
EXISTING
WIRE
WIRE NUT
90-1321
NOTE: IF THERE IS NO AUXILIARY HEAT OR IF THERE IS ONLY RADIANT HEAT,
DO NOT WIRE THE EQUIPMENT TO THE W TERMINAL OF THE LED BASE.
DIAGRAM 5 – Two Transformer Systems
THERMOSTAT
W
HEATING
RH
G
FAN
Y
COOLING
RC
C
R
LEGEND
NEW WIRE
EXISTING
WIRE
WIRE NUT
NOTE: IF THE TRANSFORMER COMMON IS NOT AVAILABLE, USE THE SUPPLIED BATTERIES TO POWER
THE AIR CLEANER CONTROL. USE ONLY THE FORCED AIR COOLING SYSTEM TRANSFORMER
90-1332
TO POWER THE AIR CLEANER CONTROL IN TWO TRANSFORMER SYSTEMS.
DIAGRAM 2 – Models without Door Latch
LED Base
Control
Y
G
C
R
SEE NOTE FOR
HEAT PUMPS AND
RADIANT HEAT
SYSTEMS
R C GF W GS
NOT USED
LED BASE
DISCONNECT EXISTING WIRE FROM THERMOSTAT G (FAN)
TERMINAL AND USE WIRE NUT TO CONNECT TO GF WIRE
FROM AIR CLEANER CONTROL
R C GF W GS A
NOT USED
AIR CLEANER CONTROL
90-1364
90-1366
A B
90-1328
TO RADIANT/
HYDRONIC
HEAT SYSTEM
TO FORCED
AIR COOLING
SYSTEM
SEE NOTE
B
90-1331