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Step 5—Operation
When relative humidity falls to humidistat set point, the humidistat
switch makes contact and starts humidifier. In some central unit
humidifier systems, furnace fan must be operating before humidi-
fier will start. An increase in relative humidity above set point will
stop humidifier.
Step 6—Checkout
Place system in operation and observe at least 1 complete cycle to
make certain that all components are functioning properly.
Fig. 21—Humidistat Installation Schematic
A97105
CASE
MOUNTING TEMPLATE
MOUNTING SCREWS (2)
FOAM GASKET
MAKE OPENING IN DUCT
MOUNT HUMIDISTAT CASE
ALTERNATE PROCEDURE:
DRILL SIX 1/4 IN.
DIAMETER HOLES
Recommended Humidistat Setting
OUTSIDE
TEMPERATURES
RECOMMENDED
HUMIDISTAT SETTING
-20°F 15%
-10°F 20% (LO)
0°F 25%
+10°F 30%
+20°F 35%
+30°F 40% (MED)
Copyright 1998 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 hum1si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 7a 9a
PC 101 Catalog No. 03HU-MC1 Printed in U.S.A. Form HUM-1SI Pg 12 7-98 Replaces: 49-4SI