Aprilaire 850 Installation & Maintenance Instructions Manual

Model 850 Steam Humidifier Fan Pack

Model 850 Steam Humidifier Fan Pack

Installation & Maintenance Instructions

TABLE OF CONTENTS

Safety Cautions..........................................2

Materials List ...........................................2

Operation ...............................................3

Specifications & Dimensions .............................3

Installation Instructions

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Mount Housing .........................................5

Hose Connections .......................................5

Electrical Wiring ........................................6

Grille Installation ........................................6

Start-up Procedure ......................................7

Maintenance............................................7

Troubleshooting Guide ...................................7

Replacement Parts.......................................8

Limited Warranty ........................................8

READ AND SAVE THESE INSTRUCTIONS

SAFETY CAUTIONS

CAUTION

ATTENTION INSTALLER

Read this manual before installing. This product must be installed by a qualified HVAC contractor and in compliance with local,
state, federal, and governing codes. Improper installation can cause property damage, severe personal injury, or death as a
result of electric shock, burns, or fire.

Read all cautions and instructions.

Read this manual before performing service or maintenance procedures on any part of the system. Failure to follow all cautions
and instructions could produce the hazardous situations described, resulting in property damage, personal injury, or death.

Failure to follow the instructions in this manual can cause moisture to accumulate, which can cause damage to structure and
furnishings.

HOT SURFACES AND HOT WATER

This steam humidification system has extremely hot surfaces. Steam pipes, and dispersion chamber can be as hot as 212°F
(100°C). Discharged steam is not always visible. Contact with hot surfaces, discharged hot water, or air into which steam has
been discharged can cause severe personal injury. To avoid severe burns, follow procedures in this manual when performing
service or maintenance procedures on any part of the system.

DISCONNECT ELECTRICAL POWER

Disconnect electrical power before installing supply wiring or performing service or maintenance procedures on any part of
the humidification system. Failure to disconnect electrical power could result in fire, electrical shock, and other hazardous
conditions. These hazardous conditions could cause property damage, personal injury, or death.

Contact with energized circuits can cause property damage, severe personal injury, or death as a result of electrical shock or
fire. Do not remove access panels until electrical power is disconnected.

Follow the shutdown procedure in this manual before performing service or maintenance procedures on any part of the system.

ELECTRICAL SHOCK HAZARD

If the humidifier starts up responding to a call for humidity during maintenance, severe bodily injury or death from electrical shock
could occur. Follow the procedures in this manual before performing service or maintenance procedures on the humidifier system.

SHARP EDGES

Sharp edges may cause serious injury from cuts. Use care when cutting openings and handling housing and grille.

EXCESS HUMIDITY

Do not operate humidifier if blower is not operating. Do not place objects in front of steam discharge. Condensation may cause
damage.

MATERIALS LIST

MATERIALS FURNISHED NOT FURNISHED

Model 850 Fan Pack

Manual humidistat

4 housing mounting screws

2 wire ties

2 grille mounting screws

Neoprene condensation tubing – 3/8” ID, 10’

Steam hose – 6’ steam hose provided with the Model 800
humidifier

Steam hose clamp – provided with the Model 800 humidifier

Wire for humidistat and wire to power Model 850 Fan Pack

2

OPERATION

17-1/16

6-7/8

6-1/16
7-1/16

5

14

Fan
Inlet

Fan Outlet

Steam Dispersion
Manifold

3/8

7-13/16

4-3/4

16" Minimum

for Steam Hose

30" Recommended

for Service Access

IMPORTANT:

Loop drain hose
below Model 850
to provide trap.

Drain

On a call for humidity the Model 800 Residential Steam Humidifier provides power to the Model 850 Fan Pack. The Model 850 blower distributes
the steam to the room. When the call for humidity ends and the humidifier stops producing steam, the Model 850 Fan Pack will continue to
operate for 2 minutes to distribute the remaining steam before de-activating.

SPECIFICATIONS & DIMENSIONS

TECHNICAL SPECIFICATIONS

• 24 VAC supplied by Model 800 humidifier

• Stainless steel steam dispersion chamber

• Noise dampening housing liner

• Ultra quiet fan

INSTALLATION INSTRUCTIONS

LOCATION

DIMENSIONS

FIGURE 1 – Dimensions of the Model 850

90-1554

The Model 850 must be located near the Model 800 Residential
Steam Humidifier to minimize the length of the steam hose. If the

Model 850 is mounted directly above the humidifier, 16” is required

for the steam hose to make the bend. See Figure 2. NOTE: The loop

in the condensate hose is required to prevent steam from escaping

into the drain.

FIGURE 2 – Side View

90-1551

3