HE360 HUMIDIFIER AND INSTALLATION KIT
5
69-2517EF—01
IMPORTANT
Calibration accuracy requires that the switch be
mounted vertically (as pictured in Fig. 8).
Fig. 8. Pressure switch—oriented vertically.
3.
The return duct is recommended, however the
switch can also be mounted to the supply duct.
Fig. 9. Mounting the pressure switch.
4.
Cut a 3/4-in. diameter hole in the duct within 10 feet
of the switch to ensure the provided tubing reaches
the pressure tap elbow.
5.
Insert the black rubber gasket into the duct hole.
6.
Connect the tubing to the tubing fitting elbow and
insert the tubing fitting elbow into the black rubber
gasket.
7.
Connect the other end of the tubing to the applica-
ble pressure connection on the switch.
e. Black connection if installed on the supply
f. Grey connection if installed on the return
g. Both grey and black if installed on both
IMPORTANT
With low-speed airflow or variable speed sys-
tems it is recommended to run tubing to both the
supply and return ducts.
Fig. 10. Install tubing.
8.
You may cut the tubing to fit the connection length
between the tubing fitting elbow and switch. It is
also recommended to secure the hose to existing
structures to avoid accidental disconnection.
Installing the Humidistat
Installing on Mounting Duct
1. Apply the template to the duct location chosen
for the humidistat. Make sure the template is
level before drilling the holes.
2. Refer to the template (provided with the H8908
Humidistat Installation Instructions) to drill the
control assembly opening and mounting holes
for the H8908.
3.
Remove the H8908 case from the base.
4.
Position the foam gasket on the H8908 base.
5.
Position the base on the duct with the arrow up.
6.
Secure the base to the duct using the four
1 in. (25 mm) mounting screws provided with humi-
distat.
7.
Connect the low-voltage wires to the leads and
replace the H8908 case. See Fig. 12.
NOTE: For wall mounting instructions, see the H8908
Installation Instructions.
M27300
M27303
A
B
SUPPLY DUCT INSTALL
- AIR LINE ONLY TO TAP A,
CONNECTED TO THE + PORT ON THE AIR FLOW SWITCH
RETURN DUCT INSTALL
- AIR LINE ONLY TO TAP B,
CONNECTED TO THE – PORT ON THE AIR FLOW SWITCH
SUPPLY/RETURN DUCT INSTALL
- AIR LINE CONNECTED
TO BOTH THE + AND – PORTS ON THE AIR FLOW SWITCH
M27304
INSIDE
OF DUCT
CONNECT TUBING TO + CONNECTION IF PRESSURE TAP IS
MOUNTED TO SUPPLY DUCT. CONNECT TO – IF PRESSURE
TAP IS MOUNTED TO RETURN DUCT.
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