Aprilaire 850 Installation and operating instructions

850 Steam Humidifier Fan Pack
5658 Fan Pack Service Part
TABLE OF CONTENTS
Safety Cautions..........................................2
Materials List ...........................................3
Operation ...............................................3
Specifications & Dimensions .............................3
Installation Instructions
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Mount Housing .........................................6
Hose Connections and Steam Manifold Installation ............6
Electrical Wiring ........................................7
Grille Installation........................................8
Start-up Procedure ......................................8
Maintenance............................................9
Troubleshooting Guide ...................................9
Service Parts...........................................10
Limited Warranty .......................................11
READ AND SAVE THESE INSTRUCTIONS
Steam Humidifier Fan Pack
Installation & Maintenance Instructions

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.
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 850 fan is not operating. Do not place objects in front of steam discharge. Condensation may cause
damage.
Do not adjust humidity set point above recommended level or to recommended level if condensation occurs on inside surface
of windows or on other surfaces. Excess condensation can cause damage to structure or furnishings. Excess moisture can
also allow the possibility for mold growth to occur.
SAFETY CAUTIONS
2

SPECIFICATIONS & DIMENSIONS
MATERIALS LIST
MATERIALS FURNISHED NOT FURNISHED
850 Fan Pack
75VA transformer for the Steam Humidifier (included with service part
5658 only, installed in Model 865/866 steam humidifiers)
Model 65 Digital Manual Humidistat (provided with service part 5658
and Model 865)
Power connector for Model 65 Digital Manual Humidistat
2 housing mounting screws
4 grille mounting screws
2 serrated nuts for mounting steam manifold
1 stainless steel 45° elbow
Steam hose – 6’ steam hose provided with the Steam Humidifier
Steam hose clamp – provided with the Steam Humidifier
Wire for humidistat and wire to power the Fan Pack
Model 5558 Modulating Humidistat (for Model 866 only)
On a call for humidity, the Steam Humidifier provides power to the Fan Pack. The Fan Pack blower distributes the steam to the room. When the
call for humidity ends and the humidifier stops producing steam, the Fan Pack blower will continue to operate for 2 minutes to distribute the
remaining steam before de-activating.
When installing with the Model 800 Steam Humidifier, use the Manual Digital Humidistat included (see Figure 8). When installing with the
Model 801 Modulating Steam Humidifier, use the Model 5558 Modulating Humidistat (see Figure 9).
OPERATION
FAN INLET FAN OUTLET
STEAM DISPERSION MANIFOLD
14
3-15/16
6-29/32
1-3/32
16-3/16
9
7-21/32
5-3/16
FIGURE 1 – Model 850 Fan Pack Dimensions (inches)
TECHNICAL SPECIFICATIONS
• 24 VAC supplied by the steam humidifier. If
purchasing the 5658 fan pack service part ensure
the included 75VA transformer is installed in the
steam humidifier.
• Stainless steel steam dispersion chamber
• Noise dampening housing liner
• Ultra quiet fan (50 dB)
DIMENSIONS
90-2193
3

LOCATION
INSTALLATION INSTRUCTIONS
MODEL 850
FAN PACK
MODEL 800
STEAM HUMIDIFIER
TYPICAL INSTALLATION
16" MINIMUM
FOR STEAM HOSE STAINLESS STEEL
45° ELBOW
30" RECOMMENDED
FOR SERVICE ACCESS
NOTICE
Fan Pack must be installed over drywall for proper operation.
The Fan Pack must be located near the Steam Humidifier to minimize
the length of the steam hose. If the Fan Pack is mounted directly
above the humidifier, 16” is required for the steam hose to make the
bend. See Figure 2.
Six feet of steam hose is provided with the Steam Humidifier. For
installations that require longer runs, a combination of the steam
hose and insulated copper pipe can be used. See Figure 3. When
using more than 24” of steam hose or 36” of insulated copper pipe,
install a Drain Tee and Trap (#4028) to help control condensate and
reduce gurgling. See Figure 5.
Due to condensation inside the hose or pipe, the output of the Fan
Pack depends on the length of the steam hose or pipe connecting it to
the Steam Humidifier. See the Steam Humidifier installation manual
for maximum steam capacity (gal/day).
Humidity behaves like a gas and under ideal conditions will expand to
fill the space. However, air movement due to drafts or as a result of
temperature stratification may cause uneven distribution of humidity
within the conditioned space. To ensure even RH distribution, install
system in a central location.
To prevent condensation on surfaces and furnishings, install the fan
pack so the steam being discharged has enough room to be absorbed
into the air before encountering surfaces.
90-2194
FAN PACK
HUMIDIFIER
STEAM HOSE
SERVICE PART #4028
(INCLUDING CLAMPS)
TO DRAIN
3/4" x 1-1/4"
REDUCING COUPLER
3/4" x 1-1/4"
REDUCING COUPLER
STEAM HOSE
1" COPPER INSULATED
90-2022
FIGURE 3
FIGURE 2 – Side View
4

MAXIMIZE
5 FEET
MINIMUM
TO OBJECTS
IN FRONT
OF GRILL
2 FEET
MINIMUM
TO SIDE
WALL
1-1/2 FEET
MINIMUM
TO CEILING
INTERNAL WALL
#4028 KIT
CONTENTS:
HOSE CLAMPS (5)
TRAP (1)
TEE ASSEMBLY (1)
REFER TO STEAM
HUMIDIFIER
INSTALLATION
MANUAL FOR
ADDITIONAL
APPLICATION
INFORMATION.
TEE
ASSEMBLY
FLARED
END
TRAP
NOTE: PRIME WITH WATER
BEFORE USING HUMIDIFIER
HOSE CLAMP
HOSE
CLAMP
HOSE CLAMP
TO FAN PACK
STEAM
HOSE
1" I.D.
STEAM HOSE, 1" I.D.
(DOWNWARD SLOPE TO TEE)
DRAIN HOSE
7/8" I.D.
STEAM HOSE
1" I.D.
(DOWNWARD
SLOPE FROM
HUMIDIFIER
TO TEE)
HOSE CLAMP
STEAM
HUMIDIFIER
FIGURE 4 – Minimum Clearances
LOCATION (CONTINUED)
The following guidelines are for a 240V installation in which the unit
discharges into a space with 70°F air temperature and 40% RH.
• Allow 5 feet of unobstructed space directly in front of the grille.
• Allow 2 feet on either side of the grille.
• Allow 1-1/2 feet above the grille.
See Figure 4.
If the room temperature is less that 70°F, allow an additional 6” to
each distance for every two degree drop in temperature.
If the RH set point is higher than 45%, allow an additional foot of
space between the grille and any obstruction or surface.
Warmer room air temperature and RH below 35% will reduce the
amount of unobstructed space required to absorb discharged steam,
but the distances provided are recommended minimums.
NOTE: Condensation running through the steam hose back into the
canister may cause a gurgling noise. Install Drain Tee and Trap #4028
as shown in Figure 5 to divert condensation to drain to eliminate
gurgling noise.
INSTALLATION INSTRUCTIONS (CONTINUED)
90-2196
90-1844
FIGURE 5
5

MOUNT HOUSING
The Fan Pack installs between the studs of a standard 16”
on-center internal wall. To ensure proper operation, the Fan Pack
must be mounted level. Use the four 1-1/2” mounting screws
provided to attach the housing to the wall studs. See Figure 6.
NOTICE
Fan Pack must be installed over drywall for proper
operation.
14-1/4"
7-1/4"
16"
WALL STUDS ON CENTER
WALL CUT-OUT
WALL STUD
FIGURE 6 – Wall Opening and Mounting
90-1550
HOSE CONNECTIONS AND STEAM MANIFOLD
INSTALLATION
Connect the steam hose (provided with the Steam Humidifier)
to the Fan Pack Steam Manifold and use hose clamp (provided
with the Steam Humidifier) to secure. Then install the steam
manifold into the Fan Pack cabinet by feeding the steam
hose back into the wall wall cavity, and secure the manifold
with the two serrated nuts (included). See Figure 7. A 45°
stainless steel elbow is provided for installations with the
steam humidifier mounted on the wall behind the fan pack. See
Figure 2. If more than 6 feet is required, use insulated hard
pipe as shown in Figure 3. See Steam Humidifier manual for
the affect on capacity.
TO STEAM HUMIDIFIER
ELECTRICAL TERMINALS
FIGURE 7 – Hose Connections
90-2197
INSTALLATION INSTRUCTIONS (CONTINUED)
6

INSTALLATION INSTRUCTIONS (CONTINUED)
ELECTRICAL WIRING
Disconnect all power to the Steam Humidifier
before wiring the Fan Pack. Use standard 24
volt thermostat wire.
Mount the humidistat in the area to
be humidified according to installation
instructions included with the control. Install
the humidistat in the same room or area as the
Fan Pack discharge, but at least ten feet away.
Wire the Manual Humidistat to the Model
800 using standard 24 volt thermostat wire.
See Figure 8. Remove the 40VA transformer
from the Steam Humidifier and replace with
the 75VA transformer supplied with the Fan
Pack (necessary for service part 5658 only). If
using the Model 65 Digital Manual Humidistat,
place the provided wire harness between
the control board and the 24VAC output
of the transformer. Connect R and C of the
humidistat to the red and white wires of the
wire harness.
When using the Model 801 Modulating
Steam Humidifier with the Modulating Control
(#5558), use the wiring diagram in Figure 9.
DO NOT USE the included wire harness.
FAN PACK
24VAC
+24V
IN
GND
1
2
6
12
13
14
36. 7
%RH
ON
1
2
3
4
STEAM HUMIDIFIER
FAN PACK
APRILAIRE MODEL 801 MODULATING STEAM HUMIDIFIER
MODEL 63 ADMC
MODULATING STEAM HUMIDIFIER
DIP SWITCH POSITION
WIRE:
18 AWG ACCEPTABLE FOR
24 VAC APPLICATION
H
H
R
C
24VAC
24VAC
YELLOW
BLUE
BLUE
YELLOW
WHITE
RED
WHITE
RED
FAN PACK
HUMIDISTAT
STEAM HUMIDIFIER
FAN PACK
APRILAIRE MODEL 800 STEAM HUMIDIFIER
TRANSFORMER
CIRCUIT
BOARD
WIRE:
18 AWG ACCEPTABLE FOR
24 VAC APPLICATION
MODEL 65 DIGITAL CONTROL
P4
FIGURE 9 – Wiring Diagram for Modulating Control and Fan Pack
FIGURE 8 – Wiring Diagram for Manual Humidistat and Fan Pack
90-2199
90-2198
7

Once the Steam Humidifier and Fan Pack are installed, turn on main power to humidifier and open saddle valve. Turn on the Steam Humidifier
and turn humidistat set point up. The Fan Pack blower will turn on. Once canister fills and water boils, steam will flow from the manifold and the
fan will distribute it to the room. Set humidistat to desired RH.
START-UP PROCEDURE
Verify that there are no leaks at steam hose connections.
The Fan Pack will operate on a call for humidity and the production of steam by the Steam Humidifier. When the call for humidity is de-activated,
the Fan Pack blower will continue to operate for 2 minutes to distribute the remaining steam in the steam hose.
CAUTION
The front of the Fan Pack will be hot. Steam may not always be visible.
Do not touch the front of the Fan Pack or place hand in front of the manifold.
INSTALLATION INSTRUCTIONS (CONTINUED)
GRILLE INSTALLATION
Use the four 5/8” screws to attach the Fan Pack grille to the fan
housing and drywall. See Figure 10. If painting the grille is desired,
see a painting professional for acceptable paint products for high
temperature (212°F), high humidity environments and polycarbonate.
FIGURE 10 –Grille Installation
90-2212
8

After replacing the Model 80 Steam Humidifier Canister:
• Ensure fan is operating during a call for humidification.
• Check drain, steam and condensate hoses for kinks, blockages, leaks or cracks. Replace if necessary.
• Ensure steam outlet of the fan pack is not blocked.
MAINTENANCE
TROUBLESHOOTING GUIDE
TABLE 1 – Troubleshooting Guide
Problem Possible cause Action
Water dripping from
Fan Pack
Tubing connection Check all connections.
Fan not operating See “Fan does not operate”.
Steam outlets blocked Clean steam dispersion manifold outlet.
Foaming in canister or
steam hose
Rinse components with clean water.
Air drafts in the space Do not install near supply ducts or ceiling fans.
Fan does not operate Wiring Check wiring.
Steam Humidifier power Check that Steam Humidifier is powered and on.
No humidity call Adjust humidistat setting. Check location of humidistat.
Circuit board output Confirm 24 VAC output from Steam Humidifier FAN PACK terminals during a call for
humidity. Confirm that the Steam Humidifier contains a 75 VA transformer.
Motor failure Replace fan motor.
Noise Fan noise Check for obstructions or damage to fan.
Gurgling Add a drip tee and trap (PN 4028) to the steam line as close to the Steam Humidifier as
possible to divert condensation to drain. See Figure 5.
If a problem arises with the Aprilaire Fan Pack, please review the following troubleshooting guide for possible causes and solutions. If the
problem persists, call Aprilaire Tech Support toll-free at 1-800-334-6011. Please be prepared to describe the exact nature of the problem.
9

SERVICE PARTS
Part No. Description
65 Digital Manual Humidistat
4028 Tee & Trap
5662 Grille
4999 Fan
5558 Modulating Humidistat
10

Your Warranty Registration information will not be sold or shared outside of this company.
LIMITED WARRANTY
Your Research Products Corporation Aprilaire®fan pack is expressly warranted for five (5) years from date of installation to be free from defects in materials or
workmanship.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any part of the fan pack which is
found to be defective within such five (5) year period and which is returned not later than thirty (30) days after said five (5) year period by you to either your original
supplier or to Research Products Corporation, Madison, Wisconsin 53701, together with the model number and installation date of the fan pack.
THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP
OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE FAN PACK ITSELF.
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID FIVE YEAR
PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL
INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED.
THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING
CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL
BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above
exclusion or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
WARRANTY REGISTRATION
Visit us online at www.aprilaire.com to register your Aprilaire product.
If you do not have online access, please mail a postcard with your name, address, phone number,
model number of product purchased and date of installation to:
Research Products Corporation, P.O. BOX 1467, Madison, WI 53701
11

P.O. Box 1467 • Madison, WI 53701-1467 • Phone: [phone] • Fax: [phone] • www.aprilairepartners.com
10011634 9.16
B2206931B
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© 2016 Aprilaire – A division of Research Products Corporation