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GENERAL FILTERS
INCORPORATED
Please Read And Save These Instructions
• Installation by anyone other than a qualified contractor voids the warranty.
• Product designed for residential installation only. Commercial installation voids warranty.
• Modification or alteration of product, parts, installation instructions or local safety codes voids warranty.
About the MHX3C Digital Humidistat
The MHX3C control provides low voltage control of most humidifiers. The humidistat uses a SPDT switch and is designed
for wall mounting in the living area or mounting on the return air duct.
!
WARNING!
Always TURN OFF POWER TO THE HVAC SYSTEM prior to installing or servicing the humidifier or
humidistat. Improper operation can result in over or under humidification. Improper voltage can cause malfunction or
damage to the control. All local building and electrical codes must be followed. The technical specifications for this
product and the contents of the user manual are subject to change without notice.
WARNING!
Do not set relative humidity too high during cold weather. Over humidification can result in condensation,
!
structural damage and mold.
General Filters, Inc.
43800 Grand River Avenue
Novi, Michigan 48375
Toll Free: (866) 476-5101
www.generalaire.com
• Read our full warranty policy at the end of this document.
Breathe Healthier
Canadian General Filters, Ltd.
400 Midwest Rd.
Toronto, ON M1P3A9 Canada
Toll Free: (888) 216-9184
www.cgfproducts.com
MHX3C Humidistat
(GFI #7038)
Installation Manual
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Table of Contents
Summary of Contents for General Filters MHX3C
- Page 1 • Read our full warranty policy at the end of this document. About the MHX3C Digital Humidistat The MHX3C control provides low voltage control of most humidifiers. The humidistat uses a SPDT switch and is designed for wall mounting in the living area or mounting on the return air duct.
- Page 2 WALL MOUNTING INSTRUCTIONS - Humidistat/Dehumidistat Versions 1. Chose a location for the MHX3C about five feet above the floor on an inside wall with average room temperature and relative humidity conditions. Drill a small hole in the wall and run low voltage wiring to the location chosen.
- Page 3 Model MHX3C Humidistat Installation Manual WARNING: ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES. Wiring Diagrams DIAGRAM 1: DIAGRAM 2: Wiring 24V Bypass Humidifier Wiring High Limit Humidistat With (Models 570, 900, 1042LH, 1099LHS, SL16) Elite Steam Humidifiers Use Terminals 2 and 3 On...
- Page 4 Using the MHX3C At Outside Recommended To adjust humidity using your MHX3C, simply turn the dial to the left or right. Turning to the left, Temperature Setting towards the number 75, increases humidity output. Turning the dial to the right, or the number 10, decreases the humidity output.
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