Specifications

READ COMPLETE SAFETY INSTRUCTIONS AND INSTALLATION TEMPLATE BEFORE STARTING
TEMPLATE MUST BE LEVEL
– TOP –
READ REVERSE SIDE FIRST! READ REVERSE SIDE FIRST!
IMPOR
T
ANT!
Be sure owner’
s manual containing
instructions for operation and warranty information is given to
owner in order to avoid unnecessary calls. Warranty is void unless
humidifier is installed by qualified heating and air conditioning
contractor due to possible misapplication of product.
1. Remove front cover by
pressing center tabs on top and
bottom of the cover (1) and base
(2). Pull feed tube (3) out of the
water distribution tray (4). Tip the
Water Panel
®
Evaporator
assembly forward and lift it out
of the humidifier.
(See Figure 1)
2. The humidifier comes
assembled for left side
discharge. If converting to right
side discharge, the base can be
rotated so round collar is facing
to the right. Swap the location of
the hole plug (10) and drain spud
(9) if using a right side discharge.
To remove the cap, push and
twist from inside the housing
while lifting the cap up slightly on
the outside. To remove the drain
spud, twist and push from the
outside of the base.
3. Using a level, position this
template at least 3 inches above
the furnace housing or cooling
coil, if applicable, for clearance
of the drain line. Trace around
template edges. Remove the
template and accurately cut the
plenum opening 9
1
⁄2” x 9
1
⁄2”,
being careful to avoid injury
from sharp edges.
4. Place the humidifier into the
plenum opening, install six sheet
metal mounting screws (not
furnished) at the top and sides of
the humidifier interior.
5. Install a 6” collar in a
convenient location on the
opposite plenum. Attach a 90
°
elbow and measure the length of
6” round duct required to make
the connection. The design of the
humidifier collar provides a solid
connection with the bypass duct
through the use of inside support
ribs and pre-formed holes for
sheet metal screws. Slip the duct
inside the collar of the humidifier
,
up to the support ribs. Using the
pre-formed holes at the top and
bottom of the humidifier collar,
secure the duct to the humidifier
collar with two sheet metal
mounting screws (not furnished).
Support bypass ducts longer
than 4 feet to prevent sagging.
6. Reinstall the W
ater Panel
®
Evaporator assembly back into
the base, with the bottom of the
scale control insert (6) sitting
firmly in the inside of the drain
spud (9). Push the feed tube
back into the water distribution
tray.
(See Figure 2) Put the front
cover back on. If the nameplate
(11) is upside down, remove it
by gently squeezing the tabs of
the nameplate from inside the
cover and pushing out. Rotate
the nameplate so it is right side
up, and snap back into place.
Turn damper handle (8) to the
open position “WINTER” for
the heating season, or closed
position “SUMMER” for the
cooling season.
7. Locate and install the
humidistat by following the
instructions shown in step #7A.
DISCONNECT ELECTRICAL
POWER TO FURNACE BEFORE
PROCEEDING TO STEP #7A!
LOCATION
1. Locate on inside wall of living
area approximately 5 feet above
floor, or in the furnace return air
plenum or duct. Adapter Plate
Part No. 4039 is required for
return air installation. If
humidifier is mounted on return
duct, humidistat must be at least
6” upstream of humidifier
2. Do not locate control in the
direct path of furnace discharge
air or drafts from open doors
and windows.
3. Do not install where operation
might be affected by lamps,
sunlight, fireplace registers,
radiators, concealed air ducts
and pipes, or room occupants.
4. The basic rules for location of
thermostats also apply to
humidistats.
8. The Model 500 humidifier solenoid
valve and humidistat operate on 24
VAC. In order for the humidifier to turn
on, the furnace blower must be
operating and the humidistat must be
calling for humidity. The interface
between the Model 500 humidifier and
the furnace to detect blower operation,
and the means of providing 24 VAC to
power the solenoid can be
accomplished several different ways:
A. If the furnace has 24 VAC “ACC” or
“HUM” terminals, which are activated
only during furnace blower operation
or a heat call, then the yellow wires
from the humidifier and the humidistat
can be connected in series with those
terminals.
B. If the furnace has 120 VAC “ACC” or
“HUM” terminals, which are activated
only during furnace blower operation
or a heat call, then the transformer
provided can be connected to those
terminals and the yellow wires from the
humidifier and the humidistat can be
connected in series with the
transformer.
C. If the transformer is powered
continuously, then a Model 50 Current
Sensing Relay (not included) must be
installed in series with the yellow wires
from the humidifier and the humidistat.
Do not wire transformer into furnace
blower circuit.
The transformer can be
powered from the 120 VAC line before
it enters the furnace.
9. Tap into a water supply line with the
saddle valve furnished. See
instructions on saddle valve package.
The humidifier will function with cold,
hot, softened or unsoftened water. The
use of service hot water (140
°
F MAX.)
and constant blower operation will
provide maximum evaporative
capacity.
When installing humidifier
NOTE: BEFORE LEAVING
THE JOB SITE, MAKE SURE:
1. Saddle valve is fully open.
2. All plumbing connections
are watertight.
3.
Humidifier functions
properly.
4. Bypass damper is in
proper position.
Figure 1 Figure 2 Figure 3
10006900 B2204039A 04.06
7A. HUMIDISTAT INSTALLATION INSTRUCTIONS:
Aprilaire Humidistat (Part No. 4016) is designed for low voltage service
to control humidification equipment.
GENERAL INSTRUCTIONS
1. Do not attempt to repair or
recalibrate humidistat.
Humidistats requiring service
should be returned to Research
Products.
2. Use humidistat in low voltage
(24 VAC) applications only.
Install 24 VAC wiring to
humidistat as shown in Wiring
Diagram, opposite side.
3. Make sure no bare wires are
exposed or insulation damaged.
Insulation on wire should extend
to head of screws.
4. Make sure all splices are
mechanically and electrically
secure.
5. To remove dirt or other foreign
matter from nylon ribbon and
control interior, dust lightly with
a fine, soft brush.
90-1067 90-1068 90-1069
12
10
2
7
9
6
11
1
4
3
5
8
90-1070
FURNISHED ITEMS
ITEMS NOT FURNISHED
Built-in bypass damper
24 V
AC Humidistat
24 V
AC Transformer
Saddle valve
Humidifier Installation Template
Mounting screws (sheet metal screws)
Water supply line (
1
⁄4” copper)
Drain line (
1
⁄2” I.D. hose)
Low voltage wire
Bypass ductwork
Humidistat Adapter Plate
Model 50 Current Sensing Relay (if required)
on heat pump system, humidifier must
be supplied with service hot water
.
NOTE: The saddle valve is designed to
be fully opened or closed. Do not use it
to regulate water flow.
10. Connect tubing from the saddle
valve to the inlet side of the solenoid
valve using
1
⁄4” O.D. copper tubing (not
furnished).
DOUBLE WRENCH TO
PREVENT LEAKING! (See Figure 3)
11. Drain spud is designed to accept
1
⁄2” I.D. plastic hose (not furnished). Run
drain line from drain spud to floor drain.
CAUTION: If hose clamp is used, do not
over tighten, drain spud could crack.
Be sure drain line has continuous
slope. NOTE: Do not sweat or directly
attach metal drain line to fitting. Do not
use solvent type adhesive when
connecting plastic drain line, since
damage to fitting could result.
12. Open saddle valve completely and
turn on furnace. Turn up humidistat so
that humidifier will turn on. Allow
humidifier to run until water is observed
coming out of the drain line. Check to
see if humidifier and saddle valve are
watertight. Check operation to make
sure that all electrical components
function properly. Set humidistat to
recommended level.
1. Front Cover
2. Base
3. Feed Tube
4. Water Distribution Tray
5. Water Panel Evaporator
6. Scale Control Insert
7. Integral Damper
8. Damper Handle
9. Drain Spud
10. Hole Plug
11.
Nameplate
12. Solenoid Valve