6 720 220 343
Subject to change without prior notice Revised 07-12
5. Connect the wires to the terminals on the
control assembly as shown in wiring diagrams.
Replace face plate.
dUCT MoUnTInG on THe ReTURn
aIR—Wall base
Humidistat/Dehumidistat versions (optional)
Caution
Do not install the humidistat on the warm air duct
or within 48” of UV light.
Caution
Wall mount option requires Bosch
P/N 7738002911
1. Locate the humidistat at least 24" upstream of
the humidifier or bypass on the return air duct.
Avoid areas of direct radiation like secondary
heat exchanger in the fan compartment.
2. Cut a square in the duct 2-1/4" wide and 1-3/4"
tall. Remove the inner portion of the mounting
gasket and discard. Use the outer portion to
seal between the plastic base and the duct. Line
up the base with the cut out and accurately mark
the holes thru the plastic duct mount plate. See
Figure 6.
USE BOTH WITH
WALL MOUNTING
USE WITH DUCT
MOUNTING ONLY
USE OUTSIDE
PORTION ONLY
WITH DUCT
MOUNTING
GASKET PLACEMENT
FIG. 2
WALL MOUNT BASE
(CAN MOUNT ON DUCT
WITH GASKETS SHOWN)
figure #6 - Wall Mount version
3. Remove the humidistat and drill four 3/32"
mounting holes.
4. Place the outer portion of the mounting gaskets
on the plastic base and mount the base with four
screws. Low voltage wire may enter the
humidistat under the gasket.
5. Connect wires to terminals on the control
assembly as shown in wiring diagrams. Replace
the face plate.
dUCT MoUnTInG on THe ReTURn
aIR—dUCT base
Humidistat/dehumidistat versions (recommended)
Caution
Do not install the humidistat on the warm air duct
or within 48” of UV light.
1. Locate the humidistat at least 24" upstream of
the humidifier or bypass on the return air duct.
Avoid areas of direct radiation like secondary
heat exchanger in the fan compartment.
2. Remove face by inserting screwdriver into the
pry slot and twisting. See Figure 7.
3. Use the plastic duct mount plate as a template.
Accurately mark and drill the (4) 3/23” mounting
holes and cut away the 4-1/4” x 2-1/2” section of
the duct mount plate.
4. Place duct mount base gasket on the humidistat
base and mount the base with four screws. Low
voltage wire may enter the humidistat under the
gasket. See Figure 7.
DUCT MOUNT
VERSION
FIG. 1
DUCT MOUNT BASE
DUCT MOUNT BASE
GASKET
SCREWDRIVER PRY SLOT
figure #7 - duct Mount version
5. Connect wires to terminals on the control
assembly as shown in the wiring diagrams.
Replace face plate.
6 IaQ series
duct Mounting on the Return air-Wall base