Manual Humidifier Control Safety and Installation Instructions R E A D C O M P L E T E I N S TA L L AT I O N I N S T R U C T I O N S A N D T E M P L AT E B E F O R E S TA R T I N G . WARNING ATTENTION INSTALLER: This product must be installed by a qualified heating and air conditioning contractor. Failure to do so could result in serious injury from electrical shock.
THESE INSTALLATION INSTRUCTIONS ARE FOR THE APRILAIRE MANUAL HUMIDIFIER CONTROL ONLY! For Aprilaire® humidifier installation, follow Aprilaire Humidifier Installation Instructions. The Manual Humidifier Control (Part 4655) is designed for low voltage service to control humidification equipment. An increase in relative humidity (RH) expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in RH reverses the process and closes the control switch. WARNING 1.
LOCATION Control can be mounted on wall in living space or on return duct. For Wall Mount: • Locate on an inside wall of living area approximately 5’ above the floor. • Do not locate control in the direct path of drafts from open doors and windows. • Do not install where operation might be affected by lamps, sunlight, fireplace, registers, radiators, concealed air ducts and pipes, or room occupants. • The basic rules for location of thermostats also apply to humidifier controls.
INSTALLING AND WIRING Wall Installation: 1. Select location for the Humidifier Control on an inside wall. Mount the Humidifier Control in a location where low voltage wires from the furnace area are already in place, or can be easily run. 2. Drill a 1/2” hole into the wall at the selected Humidifier Control location. 3. Pull low voltage wires from the furnace area and through the hole in the wall.
Figure 1 – Wall Mount ANCHOR F (x2) SCREW E (x2) BASE PLATE D HUMIDISTAT SWITCH C COVER B KNOB A BASE PLATE D 90-1228 5
Duct (sheet metal) Installation: 1. Select Humidifier Control location on furnace return air duct. 2. Use the attached template to mark the duct opening. 3. Carefully cut the opening in the duct. 4. (See Figure 2) Gently pull knob (A) from Humidifier Control cover (B). Cover is held in place by snap clips. Remove cover by pulling carefully. Do not touch the sensing element. 5. Run low voltage leads to control location. All wiring should conform to the National Electrical Code and local regulations. 6.
Figure 2 – Sheet Metal Duct Mount GASKET G SCREW H (x4) BASE PLATE D HUMIDISTAT SWITCH C COVER B KNOB A INSIDE OF RETURN DUCT RETURN DUCT 90-1229 7
Duct (fiber board) Installation: 1. Select Humidifier Control location on furnace return air duct. 2. Cut a rectangular hole in the duct board, no smaller than 5-3/4 inches long by 3-3/4 inches wide. 3. Cut a rectangular piece of sheet metal to fit behind the hole in duct board for mounting the Humidifier Control. 4. Use the attached template to mark the sheet metal opening for the Humidifier Control. 5. Carefully cut the opening in the sheet metal. 6.
Figure 3 – Fiber Board Duct Mount GASKET G SCREW H (x4) HUMIDISTAT SWITCH C COVER B KNOB A INSIDE OF RETURN DUCT BASE PLATE D SHEET METAL PLATE RETURN DUCT RETURN DUCT SHEET METAL PLATE CUT OPENING IN RETURN DUCT 90-1230 9
SPECIFICATIONS RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15% to 50% OPERATIONAL DIFFERENTIAL . . . . . . . . . . . 8% RH NOMINAL DIMENSIONS (Inches) Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1/8” Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3/8” Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. USING 4 SHEET METAL SCREWS, INSTALL HUMIDIFIER CONTROL IN OPENING. 4. REMOVE TEMPLATE AND ACCURATELY CUT OPENING. 3. TRACE OUTSIDE EDGES OF TEMPLATE. 2. PLACE TEMPLATE ON THE SHEET METAL RETURN PLENUM UPSTREAM OF (BEFORE) THE HUMIDIFIER CONNECTION. 1. CUT OUT TEMPLATE ALONG EDGES.
RESEARCH PRODUCTS CORPORATION P.O. BOX 1467 • MADISON,WI 53701-1467 Call 800/334-6011 • FAX 608/257-4357 10007235 8.