700M OWNER’S MANUAL

Loading ...

OPERATING INSTRUCTIONS –

MODELS 400M, 500M, 600M & 700M

Your AprilAire Humidier is controlled by a Manual Humidier Control

(see FIGURE C). The Manual Humidier Control is installed either in

the cold air return duct or on an interior wall of the home. With the

Manual Humidier Control, it is important to anticipate a drop in

outdoor temperature and reduce the RH set point accordingly to

avoid excessive condensation, just as with the Digital Humidier

Control installed in Manual mode (see page 8).

To determine the indoor RH, slowly turn the knob clockwise and

counterclockwise and listen for 2 clicks. The indoor RH is within the

range of the 2 clicks.

CHECK THE HUMIDIFIER OPERATION –

MANUAL HUMIDIFIER CONTROL

1. The HVAC system fan must be running for the humidier to

function. Make a heat or fan call at your thermostat.

2. Set the knob to the highest RH set point, make sure that the water

saddle valve is open and that there is electricity to the humidier.

3. Return control knob to the desired RH set point.

90-1237

FIGURE C: MANUAL HUMIDIFIER CONTROL

Loading ...

OWNER’S MANUAL - Page 11