AprilAire 700 Series Fan-Powered Evaporative Humidifier Installation Template

SPECIFICATIONS

• Humidifier Dimensions: Width: 15-29/32", Height (including solenoid valve and drain spud): 18", Depth: 10-11/32"
• Plenum Opening: 14-3/4"W x 14-5/16"Η
• Water Feed Rate: 3 gph
• Electrical Data: 24 VAC, 60 Hz, 0.8 Amp
• Water Panel®: Model 35

INSTALLATION OPTIONS

AprilAire Model 700 and 700M can be installed on either the supply plenum or cold air return of a forced air handling system. The humidifier dimensions and serviceability must be considered when selecting the best location for the humidifier.

Hot water is recommended (140°F max) for maximum evaporative capacity. It is also required when the Blower Activation Feature is used with an Automatic Digital Humidifier Control, when mounted on a heat pump system, or when the humidifier is mounted on a cold air return. The humidifier functions with cold, hot, softened, or unsoftened water.

RECOMMENDED

RETURN

SUPPLY

ALTERNATE

RETURN

SUPPLY

HOT WATER SUPPLY

Diagram showing recommended and alternate installation locations on supply and return plenums, indicating hot water supply and drain line connections.

Diagram illustrating the relationship between the humidifier and cooling coils.

DRAIN LINE

FLOOR DRAIN OR CONDENSATE PUMP

PARTS LIST

FURNISHED ITEMS

• 24 VAC transformer
• Automatic Digital Humidifier Control and Outdoor Temperature Sensor (Model 700 only)
• Manual Humidifier Control (Model 700M only)
• Humidifier Control Installation Instructions
• Saddle valve
• Humidifier Installation Template

ITEMS NOT FURNISHED

• Mounting screws (sheet metal screws)
• Water supply line (1/4" O.D. copper)
• Drain line (1/2" I.D. hose)
• Low voltage wire (18-22 gauge)
• Model 50 current sensing relay (if required)

NOTICE

FREEZING TEMPERATURES CAN BURST WATER PIPES. Do not install the humidifier where freezing may occur. The water line could freeze and crack causing water damage to the home.

CONDENSATION DAMAGE OR MOLD CAN OCCUR.

• Position the return duct mounted humidifier control at least 6" upstream of the humidifier or fresh air intake for accurate humidity sensing.
• Position the wall-mounted humidifier control in areas unaffected by drafts or heat sources for accurate humidity sensing.
• Lower the humidity setting on the humidifier control if there is excess condensation on the inside of any windows in unheated living spaces.

EQUIPMENT DAMAGE MAY OCCUR IF INSTALLATION INSTRUCTIONS ARE NOT FOLLOWED.

• Do not install the humidifier on the furnace jacket.
• Do not connect the power cord to multi-speed furnace blower motors or blower motors other than 120 VAC. Use AprilAire Model 50 Current Sensing Relay. Do not alter 120 VAC plug or hardwire the unit.
• Do not install the humidifier on a plenum face at the blanked end of the cooling coil.
• If water pressure exceeds 125 psi, reduce water pressure with devices allowed by local codes.
• Use hot water with a temperature no greater than 140°F (60°C).
• Do not install the humidifier on systems with external static pressure greater than 0.4" w.c.
• When installing the humidifier control on the return duct of a downflow furnace, ensure blower continues to run after a heat call is satisfied to eliminate high temperatures from damaging the humidifier control.
• Periodically check drain line to make sure water flows freely to drain.

INSTALLATION INSTRUCTIONS

1. Detach the cover assembly by lifting the latch at the bottom.
2. Remove the Water Panel evaporative assembly.
3. Cut opening using this template.
4. Position base in duct opening top-first so hooks engage sheet metal at top. Insert bottom of base and slide down to engage hooks at bottom.
5. Rotate swing locks to secure base to duct.
6. Secure base with screws. Tighten water line by double wrenching.

7a. Location of manual humidifier control in living space.

Diagram showing placement of manual humidifier control in a living space, with 'NO' indicators for proximity to doors and windows.

7b. Locate manual or digital humidifier control on the return at least 6" above the humidifier.

Diagram showing placement of manual or digital humidifier control on the return duct, 6 inches above the humidifier.

7c. Locate manual or digital humidifier control on the return.

Diagram showing placement of manual or digital humidifier control on the return duct.

8. Completed installation.

Diagram showing a completed humidifier installation.

MODEL 700 DIGITAL HUMIDIFIER CONTROL WIRING

Diagram illustrating the wiring for the Model 700 Digital Humidifier Control, showing connections to the outdoor temperature sensor, thermostat, equipment terminals, and a 120 VAC outlet via a transformer.

NOTE: Control will display software revision level, e.g., r3, when the one minute test cycle has completed. Refer to the control installation manual for system checkout instructions.

MODEL 700M MANUAL CONTROL WIRING

Diagram illustrating the wiring for the Model 700M Manual Humidifier Control, showing connections to furnace accessory terminals or a transformer, and a 120 VAC outlet. It also details the use of a Model 50 current sensing relay.

IMPORTANT: Use 120 VAC power source other than furnace blower circuit. However, the transformer can be powered off the hot 120 VAC line before it enters the furnace. Do not wire transformer into furnace blower circuit.

IMPORTANT: When Model 50 current sensing relay is used, wire Model 50 current sensing relay into 24 VAC humidifier control circuit only! Do not install in transformer primary circuit.

DRAIN LINE:

• Ensure downward slope and no kinks.
• Do not over-tighten hose clamp onto drain spud.
• Do not use solvent adhesive on drain spud.
• FLOOR DRAIN OR CONDENSATE PUMP

INSTALLATION CHECKLIST

• Saddle valve is fully open. ✔️
• All plumbing connections are watertight. ✔️
• Unit is plugged into 120 VAC outlet. ✔️
• Humidifier functions properly. ✔️
• Owner's manual has been given to homeowner. ✔️