Aprilaire 60 Setup guide

Automatic
Digital Humidifier Control
Model 60 &62
Safety and Installation Instructions
WARNING
ATTENTION INSTALLER: T is product must be
installed by a qualified eating and air conditioning
contractor. Failure to do so could result in serious
injury from electrical s ock.
READ COMPLETE INSTALLATION INSTRUCTIONS
AND TEMPLATE BEFORE STARTING INSTALLATION.
Model 60 shown.

32
G tting Start d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag 7
Syst m Ch ckout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag 19
Troubl shooting Guid . . . . . . . . . . . . . . . . . . . . . . . . . . . .pag 21
TABLE OF CONTENTS
THESE INSTALLATION INSTRUCTIONS
ARE FOR THE APRILAIRE®AUTOMATIC DIGITAL
HUMIDIFIER CONTROL ONLY!
For Aprilaire®humidifier installation,
follow Aprilaire Humidifier Installation Instructions.
WARNING
Hazardous Voltage can cause serious injury
from electric s ock.
Disconnect electrical power to t e furnace and
umidifier before starting installation.
Sharp edges can cut.
Wear gloves and use care w en cutting plenum
openings and andling ductwork.
CAUTION
Condensation damage may occur.
Do not set umidifier control ig er t an
recommended.
Lower t e umidity setting if t ere is excess
condensation on t e inside of any windows in
un eated living spaces.
Install according to t e enclosed installation
instructions.
Controller damage or malfunction may occur
if installation instructions are not followed.
Install umidifier control on return plenum only.
Install umidifier control upstream of t e bypass
outlet or steam dispersion tube.
Do not install umidifier control facing downward.
GETTING STARTED
STEP 1: Unpack the Humidifier Control Carton
Mak sur all compon nts ar pr s nt (s Figure A):
A. Humidifi r Control
B. Outdoor T mp ratur S nsor
C. Manual Mod Lab l
B
AC
Figure A 90-1201B

54
STEP 2: Disassemble the Humidifier Control
R mov th knob. R mov th cov r by pulling at th bottom and
swinging it out and upward. S Figur Bto b com familiar
with th t rminal positions. Figur s Kand Lshow compl t
installation wiring diagrams for Aprilair Humidifi rs.
Figure B – Digital Humidifier Control 24V Terminals
90-1397B
HHGfW GODTBACR
OUTDOOR
TEMPERATURE
SENSOR
24 VAC FROM
HVAC EQUIPMENT
“R” AND “C”
COMMUNICATION
WITH APRILAIRE
8570 THERMOSTAT
HEAT SIGNAL
FROM HVAC
EQUIPMENT
FAN SIGNAL
FROM
THERMOSTAT
SOLENOID
CONTROL
OUTPUT
FAN SIGNAL
TO HVAC
EQUIPMENT
R v rsing th Rand Ct rminals on humidifi r control
will caus improp r op ration.
Water Panel
Indicator
Settings
STEP 3: Set the Change Water Panel Indicator
This s tting will control wh n th indicator light turns on,
r minding you to chang your wat r pan l. If your Control cam
with a humidifi r, th Control is pr -s t for th humidifi r. If th
installation sit has a 3-month or short r h ating s ason or v ry
hard wat r, you may want to adjust th s tting (s Figure C).
Set to “OFF” for Mod l
800 S ri s humidifi rs or
to turn th Humidifi r Pad
Chang indicator to off.
Set to “A” for Mod l
400 S ri s humidifi rs
in ar as with v ry hard
wat r. Th indicator
will light aft r 150
hours of op ration.
Set to “B” for Mod l 400
S ri s humidifi rs; and
Mod l 500 S ri s, 600
S ri s and 700 S ri s
humidifi rs in ar as with
v ry hard wat r. Th
indicator will light aft r
300 hours of op ration.
Set to “C” for Mod l 500 S ri s, 600 S ri s
and 700 S ri s humidifi rs. Th indicator will
light aft r 600 hours of op ration.
Figure C
90-1202B

76
STEP 4: Blower Activation Feature Explanation
S t th Blow r Activation switch to “ON”, s Figure J, to allow
th Humidifi r Control to activat th furnac fan for additional
humidification. This may b r quir d if th humidifi r is mount d
on a h at pump or a furnac with short run cycl s. Wh n using
th Blow r Activation f atur , Mod l 400, 500, 600 and 700
s ri s humidif rs must b plumb d to hot wat r for ff ctiv
op ration.
Wh n th Blow r Activation switch is “ON”, th Humidifi r
Control will turn on th HVAC blow r wh n humidity is r quir d.
In th “OFF” position, th humidifi r will only op rat if humidity
is r quir d and th HVAC syst m is op rating.
Wh n th Blow r Activation switch is “ON”, th Humidifi r
Control may xt nd th HVAC blow r aft r a h at call for up to
two hours. If th HVAC syst m has b n idl for on hour, th
control will turn th blow r on for thr minut s to sampl
hous hold air to d t rmin if humidity is n d d.
NOTE: If us d in conjunction with an Aprilair 8570
Communicating Th rmostat, and th blow r activation f atur is
d sir d, DO NOT wir th A B communication t rminals.
Th Mod l 62 shipp d with th Mod l 800 St am Humidifi r is
factory s t to “OFF”. Th Mod l 62 do s not hav th “Chang
Wat r Pan l” light on th Control. Th Canist r Chang indicator
for th Mod l 800 is on th humidifi r. STEP 1: Mount the Humidifier Control
Humidifi r Control must b mount d on th R turn Duct, at l ast
6 inch s upstr am of th following (s Figure D):
• Humidifi r
• Humidifi r Bypass Ductwork (if applicabl )
• Fr sh Air Intak Ductwork (if applicabl )
For accurat humidity control, mount th Humidifi r Control at
l ast 12 inch s upstr am of th St am Humidifi r disp rsion tub .
Ambi nt op rating t mp ratur of th Humidifi r Control is to b
from 20°F to 120°F to pr v nt damag to th control display.
90-1137
6" MIN.
RETURN
DUCT
HUMIDIFIER
CONTROL
FRESH AIR
INTAKE
COIL
HUMIDIFIER
BYPASS
CONNECTION
INSTALLATION
Figure D

98
DUCT (SHEET METAL) MOUNT:
Aft r location for Control is s l ct d, drill a 3/4 inch hol for th
RH s nsor (th RH s nsor xt nds from th back of th
Humidifi r Control).
Us 2 sh t m tal scr ws, 3/4 inch long (not provid d), to mount
th Humidifi r Control. Us th mounting slot to l v l th Control,
th n s cur th Control with th s cond sh t m tal scr w.
Mak sur th Humidifi r Control s nsor gask t is s at d tightly
around th drill d hol . Do not install Control without gask t.
CAUTION
Controller damage or malfunction may occur if
installation instructions are not followed.
Install umidifier control on return plenum only.
Install umidifier control upstream of t e bypass
outlet or steam dispersion tube.
Do not install umidifier control facing downward.
DUCT (FIBER BOARD) MOUNT:
Aft r location for Control is s l ct d, cut a r ctangular hol in
th duct board, no small r than 6-9/16 inch s long by 4-3/8
inch s wid .
Cut a r ctangular pi c of sh t m tal to fit b hind th hol in
duct board for mounting th Humidifi r Control.
Drill a 3/4 inch hol for th RH s nsor (th RH s nsor xt nds from
th back of th Humidifi r Control) into th sh t m tal plat .
Us 2 sh t m tal scr ws, 3/4 inch long (not provid d), to mount
th Humidifi r Control.
Mak sur th Humidifi r Control s nsor gask t is s at d tightly
around th drill d hol . Do Not Install Control Without Gask t.
S cur th sh t m tal plat , with th Humidifi r Control
mount d, insid th duct (s Figure E).
CONTROL REPLACEMENT:
Wh n r placing an xisting control, th duct op ning l ft by th
r mov d control must b cov r d compl t ly. Locat and install
th n w control as instruct d pr viously in this st p.

1110
90-1203B
CONTROL BOARD
COVER
KNOB
BASE PLATE
RETURN DUCT
RETURN
DUCT
SHEET METAL
PLATE
CUT OPENING IN
RETURN DUCT
SHEET METAL PLATE
GASKET
SCREW (x2)
INSIDE OF
RETURN
DUCT
STEP 2: Determine Location for and Mount Outdoor
Temperature Sensor
Th location of th Outdoor T mp ratur S nsor must m t
th s thr r quir m nts:
1. Must b mount d on North, East or W st sid of hous out of
dir ct sunlight.
2. Must b at l ast 3 f t from all xhaust v nts.
3. Must b abov xp ct d snow lin (s Figure F).
Incorr ct humidity l v ls will r sult if th s r quir m nts ar not
m t.
S cur s nsor brack t with a #8 galvaniz d scr w.
Figure F NORTH, EAST
OR WEST SIDE
OF HOME
OUTDOOR
TEMPERATURE
SENSOR
SENSOR
BRACKET
SENSOR
ABOVE EXPECTED
SNOW LINE
OUTDOOR
TEMPERATURE SENSOR
LEADS
90-998
NOTE: A conv ni nt way to g t th S nsor wir outsid is to
mak us of unus d wir s running to th A/C cond nsing unit
(if applicabl ). Oth r ways ar to us xisting hol s for Cabl TV
lin s, t l phon lin s, A/C lin s, tc. R ad all quipm nt
instructions b for hand for possibl conflicts and warnings.
Figure E – Fiber Board Duct Mount

1312
STEP 3: Alternate Location for Outdoor
Temperature Sensor
Wh n mounting th Outdoor T mp ratur S nsor in an intak air
duct th turn th Blow r Activation switch (s Figure J) to
“OFF”. If l ft in th “ON” position, ov r humidification and
cond nsation damag could occur.
Th S nsor can b mount d with a #8 galvaniz d scr w in th
c nt r of ith r:
• PVC fr sh air intak pip for th HVAC syst m.
OR
• A fr sh air intak duct.
In both cases, the Sensor must be no more than 3 feet
from the outside wall. See Figure G.
If it is not f asibl to us th Outdoor T mp ratur S nsor in any
of th ways d scrib d, th Humidifi r Control can b install d for
Manual Op ration. S “Installing th Humidifi r Control for
Manual Op ration” and Figure J for d tails.
Figure G
3 FEET MAX.
CENTER LINE
OUTSIDE WALL
90-999
STEP 4: Route the Wire from Control to Sensor
Run wir to th outdoor t mp ratur s nsor. S nsor is accurat
with l ad l ngths up to 300 ft.
STEP 5: Attach Sensor Wire to Humidifier Control
Strip wir 1/4 inch, and ins rt th wir s from th S nsor into th
t rminals lab l d “ODT” on th Humidifi r Control. S Figure H
for location of t rminals.
Figure H
90-1219B
CAUTION
Do not run outdoor temperature sensor alongside
wires carrying ig voltage (120 VAC or ig er).

1514
Installing the Humidifier Control for
Manual Operation
If it is not feasible to install t e Outdoor Temperature
Sensor, t e Humidifier Control can be operated in
Manual Mode.
1. Position t e Mode Switc in t e “MAN” position.
Manual indicator “M” will be displayed.
2. Apply t e Manual Mode Label to t e cover,
aligning t e sticker and knob oles.
BLOWER ACTIVATION SWITCH
AUTO/MANUAL MODE SWITCH
Figure J
90-1236B
STEP 6: Model 60 Wiring for Model 400, 500, 600, and
700* Series (Gray Housing) Humidifiers – See Figure K
Strip th wir s us d for all Humidifi r Control t rminal
conn ctions 1/4 inch.
NOTES:
• Th Mod l 60 must b continuously pow r d from “R” and “C”
on th furnac to function prop rly.
• Th minimum VA r quir d is 2.0 VA.
• In ord r for th humidifi r to op rat , th HVAC blow r must b
running and th Mod l 60 must b calling for humidity.
WIRING DESCRIPTION:
• Wir xt rnal 24 VAC transform r into a constant pow r sourc
oth r than th h ating, v ntilating, air conditioning quipm nt
(HVAC) blow r circuit. Th transform r can b pow r d off th
120 VAC lin at th junction box b for it nt rs th HVAC
quipm nt. Conn ct th 24 volt sid of th transform r to on of
th “H” t rminals on th humidifi r control and to on of th
humidifi r sol noid valv wir s. Conn ct th oth r sol noid
valv wir to th oth r “H” t rminal.
• Wir “R” and “C” on th Mod l 60 to “R” and “C” on th
furnac t rminal strip.
• R mov th th rmostat “G” wir from th furnac t rminal strip
and wir it to “G” on th Mod l 60 control.
• Wir “Gf” on th Mod l 60 to “G” on th furnac t rminal strip.
WARNING
120 volts may cause serious injury from electrical
s ock. Disconnect electrical power to t e furnace
before starting installation.
NOTE: If control s tting was chang d b tw n Automatic and
Manual mod , pow r to th control must b cycl d by r moving
th n r installing th R wir .

G
Y
W
C
R
THERMOSTAT
120 VAC
R
C
W
Y
G
FURNACE
OUTDOOR
TEMPERATURE
SENSOR FOR
AUTOMATIC
MODE
NORTH, EAST
OR WEST SIDE
OF HOME
ABOVE EXPECTED
SNOW LINE
CONTINUOUSLY POWERED
24 VAC TRANSFORMER
PROVIDED WITH HUMIDIFIER
CONNECT
TO HOT WATER
SUPPLY
CONNECT
DRAIN LINE
HERE
OUTPUTSINPUTSPOWER
GW
CRHHODT GfA
ADHC TERMINAL STRIP
B
1716
Figure K – Model 60 Wiring for Model 400, 500, 600
and 700* Series (Gray Housing) Humidifiers
90-1510
• Wir “W” on th Mod l 60 to “W” on th furnac t rminal strip.
• R plac cov r and knob.
*See note on page 18.
STEP 7: Model 62 wiring for Model 00 Series Steam
Humidifier and Model 60 Wiring for Model 700* Series
(Almond Housing) Humidifiers – See Figure L
Strip th wir s us d for all Humidifi r Control t rminal
conn ctions 1/4 inch.
NOTES:
• Th Mod l 62 must b continuously pow r d from “R” and
“C” on th furnac to function prop rly.
• Th minimum VA r quir d is 2.0 VA.
• In ord r for th humidifi r to op rat , th HVAC blow r must
b running and th Mod l 62 must b calling for humidity.
WIRING DESCRIPTION:
• Wir “H” t rminals on th Mod l 62 to th “Humidifi r”
t rminals on th Mod l 800 control board.
• Wir “R” and “C” on th Mod l 62 to “R” and “C” on th
furnac t rminal strip.
• R mov th th rmostat “G” wir from th furnac t rminal
strip and wir it to “G” on th Mod l 62 control.
• Wir “Gf” on th Mod l 62 to “G” on th furnac t rminal
strip.
• Wir “W” on th Mod l 62 to “W” on th furnac t rminal
strip.
• R plac cov r and knob.
WARNING
120/240 volts may cause serious injury from electrical
s ock. Disconnect electrical power to t e furnace
and umidifier before starting installation.
CAUTION
Model 700 series Humidifiers wit almond ousings
(produced prior to October 2007) wired per Figure K will
experience circuit board damage rendering t e unit
inoperable. See Figure L for proper wiring diagram.

1918
OUTPUTSINPUTSPOWER
GW
CRHHODT GfA
ADHC TERMINAL STRIP
B
MODEL 800
STEAM HUMIDIFIER
OUTDOOR TEMPERATURE SENSOR
FOR AUTOMATIC MODE
FURNACE
THERMOSTAT
R
C
W
Y
GG
Y
W
C
R
Figure L – Model 62 wiring for Model 00 Series
Steam Humidifier and Model 60 Wiring for Model
700* Series (Almond Housing) Humidifiers
90-1511
*Model 700 Series h midifiers prod ced prior to October 2007
have an almond color ho sing and internal transformer
providing 24VAC to the solenoid valve. Models prod ced after
October 2007 have a gray ho sing and external transformer
provided with the nit.
1. R plac th cov r by snapping it into th Humidifi r Control
bas . Also r plac th knob onto th Control.
2. Turn Blow r Activation switch to OFF
3. R stor pow r to th HVAC syst m.
4. Activat th HVAC syst m or h at pump (Fan or H at).
5. Onc th blow r is op rating, rotat th knob of th
Humidifi r Control Clockwis to th “T st/R s t” position.
Wh n th knob is s t in th “T st/R s t” position, th gr n
“Humidifi r On” light will illuminat . Aft r 5 s conds, th
gr n “Humidifi r On” light will blink, indicating a syst m
r s t.
6. If th Humidifi r Control and humidifi r ar s t up prop rly,
you should h ar th sol noid valv click into th op n
position. On th Mod l 800 St am Humidifi r, th “St am”
light will illuminat gr n. In th “T st/R s t” position, th
humidifi r will op rat for 1 minut . If th Humidifi r Control
is l ft in th “T st/R s t” position for mor than 1 minut ,
th “H” t rminals will op n (closing th sol noid valv ), and
th knob and display backlights will flash, indicating that th
Humidifi r Control is still in th “T st/R s t” position.
7. If th humidifi r do s not activat with th Humidifi r Control
in th “T st/R s t” position, r f r to th troubl shooting
guid .
SYSTEM CHECKOUT

2120
Blower Activation Test
• D activat HVAC syst m or h at pump.
• Turn knob to OFF.
• S t switch to Blow r Activation ON.
• Turn th knob to T st/R s t. Th Humidifi r On light will
illuminat . Aft r 5 s conds, th gr n “Humidifi r On” light
will blink, indicating a syst m r s t.
• If th Humidifi r Control and humidifi r ar s t up prop rly,
th sol noid valv should click and th HVAC blow r
should activat .
• If th humidifi r do s not activat with th Humidifi r
Control in th “T st/R s t” position, r f r to th
troubl shooting guid .
• If HVAC blow r do s not activat with th Humidifi r
Control in th "T st/R s t" position, r f r to th
troubl shooting guid .
8. S tting th Humidifi r Control:
• If th hom is occupi d, s t th Humidifi r Control to
“Normal”. (For Manual Mod , s t to 35%.)
• Blow r Activation f atur will not activat imm diat ly.
Humidifi r Control will start th blow r aft r th HVAC
syst m has b n idl for 1 hour to sampl th air to
d t rmin if humidity is n d d.
• If th hom is vacant, s t th Humidifi r Control to “OFF”.
• If in Manual Mod and syst m is install d during cooling
s ason, s t th Humidifi r Control to “OFF”.
9. Instruct th hom own r to r f r to th Aprilair Own r’s
Manual for th initial adjustm nt p riod.
10. Mak sur th r d “Call D al r for S rvic ” light is not
flashing. If th r d “Call D al r for S rvic ” light is flashing,
r f r to th troubl shooting guid .
TROUBLESHOOTING GUIDE
SYMPTOM
Call D al r For S rvic Light Flashing (s Figure M).
TROUBLESHOOTING PROCEDURE
Appli s to both Automatic and Manual Op ration unl ss
indicat d oth rwis .
Display Error Code: E1: RH S nsor
Rotat Humidifi r Control knob to th “T st/R s t” position.
Aft r 5 s conds, th gr n “Humidifi r On” light will blink,
r s tting th rror. If E1 r turns, r plac th Humidifi r Control.
Display Error Code: E2: Control Knob
Rotat Humidifi r Control knob to th “T st/R s t” position.
Aft r 5 s conds, th gr n “Humidifi r On” light will blink,
r s tting th rror. If E2 r turns, r plac th Humidifi r Control.
Display Error Code: E3: Outdoor T mp ratur S nsor
Auto Mode (switch in “AUTO” position)
1. Mak sur that th Outdoor T mp ratur S nsor is prop rly
conn ct d to th ODT t rminals on th Humidifi r Control.
2. M asur th r sistanc of th Outdoor T mp ratur S nsor
by r moving th l ads from th Humidifi r Control t rminals
and m asuring th r sistanc across th wir s with an
ohmm t r. Confirm th r ading with th t mp ratur in
Table 1 on pag 23. R conn ct th ODT S nsor l ads. If th
r sistanc valu do s not match th t mp ratur valu ,
r plac th Outdoor T mp ratur S nsor.

2322
TROUBLESHOOTING PROCEDURE (CONTINUED)
3. Rotat Humidifi r Control knob to th “T st/R s t” position.
Aft r 5 s conds, th gr n “Humidifi r On” light will blink,
r s tting th rror. If E3 r turns, r plac th Humidifi r
Control.
Manual Mode (switch in “MAN” position)
1. Mak sur th ODT t rminals ar cl ar of any wir s that
may short th t rminals tog th r oth r than th ODT s nsor.
2. Rotat Humidifi r Control knob to th “T st/R s t” position.
Aft r 5 s conds, th gr n “Humidifi r On” light will blink,
r s tting th rror. If E3 r turns, r plac th Humidifi r
Control.
Display Error Code: E4: Communication
This rror appli s to syst ms wir d to an Aprilair Mod l 8570
Th rmostat (s Figur Q) using th “A” and “B” t rminals.
Rotat th Humidifi r Control knob to th “T st/R s t”
position. Aft r 5 s conds, th gr n “Humidifi r On” light will
blink, r s tting th rror. If E4 r turns, ch ck th wiring
b tw n th Digital Humidifi r Control and Mod l 8570 ch ck
th conn ctions at “A”and “B” on th humidifi r control and
th Mod l 8570. Mak sur th Mod l 8570 is wir d and
op rating prop rly according to th Mod l 8570 manual.
TABLE 1
Outdoor Temperature (°F) Resistance ( kΩ) ±10
-30 231.8
-20 163.4
-10 117.3
0 84.8
10 62.2
20 46.1
30 34.4
40 26.1
50 19.9
60 15.3
70 11.9
80 9.3
90 7.3
100 5.8
Figure M
Red “Call Dealer For Service” Light
Yellow “Change Water Panel” Light
Green “Humidifier On” Light
90-1227

2524
SYMPTOM
Humidifi r do s not op rat in “T st/R s t” mod .
TROUBLESHOOTING PROCEDURE
• Ch ck wiring diagrams for corr ct Humidifi r Control
installation.
1. For Mod l 700 S ri s Humidifi rs with gray color
housings nsur that wiring diagram in Figure K is us d.
2. For Mod l 700 S ri s Humidifi rs with almond color
housings nsur that wiring diagram in Figure L is us d.
• Mak sur that th blow r is op rating and th HVAC
syst m is calling for h at.
• If conn ct d to a Mod l 400 S ri s humidifi r, mak sur
both floats in th bottom of th scal control ins rt ar in
th down position. If n c ssary, dump out wat r to low r
th floats.
• Ch ck voltag at th Humidifi r Control “R” and “C”
t rminals. Voltag should b 22 VAC minimum to 30 VAC
maximum.
• Mak sur that th saddl valv is op n.
• In “T st/R s t mod , th humidifi r will op rat for 1
minut only. DO NOT LEAVE THE HUMIDIFIER CONTROL IN
“TEST/RESET” MODE AS THE HUMIDIFIER WILL NOT
OPERATE.
SYMPTOM
Y llow “Chang Wat r Pan l” light is blinking (s Figure M).
TROUBLESHOOTING PROCEDURE
Ch ck th condition of th Wat r Pan l and r plac it if
min ral d posits ar blocking air flow. Follow th instructions
on th Wat r Pan l box. Rotat th knob to th “T st/R s t”
position for at l ast 5 s conds to r s t Wat r Pan l chang
tim r. Ch ck that th tim r s tting is corr ct for th humidifi r
mod l and wat r conditions (s Figure C). DO NOT LEAVE
THE HUMIDIFIER CONTROL IN “TEST/RESET” MODE AS THE
HUMIDIFIER WILL NOT OPERATE.

2726
SYMPTOM
Humidifi r op rat s only in “T st/R s t” mod .
• If outdoor t mp ratur is gr at r than 60°F or l ss than
-30°F, th Humidifi r Control will only op rat in th
“T st/R s t” mod (for 1 minut ).
• If th humidity l v l in th hom is high r than th
Humidifi r Control knob s tting, th Humidifi r Control will
not op rat th humidifi r.
TROUBLESHOOTING PROCEDURE
• M asur th r sistanc of th Outdoor T mp ratur S nsor
by r moving th l ads from th Humidifi r Control t rminals
and m asuring th r sistanc across th wir s with an
ohmm t r. Confirm th r ading with th t mp ratur in
Table 1. R conn ct th ODT S nsor l ads. If th r sistanc
valu do s not match th t mp ratur valu , r plac th
Outdoor T mp ratur S nsor.
• Mak sur that th Outdoor T mp ratur S nsor is mount d
compl t ly outsid th hous on th North, East or W st
sid of th hous and out of dir ct sunlight. (Automatic
Mod Only)
• Mak sur that th Outdoor T mp ratur S nsor is locat d
at l ast 3 f t away from all xhaust v nts. (Automatic
Mod Only)
• If Outdoor T mp ratur S nsor is mount d in th fr sh air
intak duct, mak sur that th s nsor is no mor than 3
f t from th outsid wall. (Automatic Mod Only)
• Mak sur th R and C t rminals ar wir d p r nclos d
wiring diagrams.
• If control s tting was chang d from Automatic to Manual,
pow r to th control must b disconn ct d, th n r stor d.
SYMPTOM
Humidifi r op rat s constantly.
• If th humidity l v l in th hom is l ss than th Humidifi r
Control knob s tting and th r is a continuous fan call or
h at call (d p nding on s tup), th Humidifi r Control will
op rat th humidifi r until th humidity l v l is high r than
th Humidifi r Control knob s tting.
TROUBLESHOOTING PROCEDURE
• S t Blow r Activation switch to OFF.
• In th “T st/R s t” mod , v rify that th humidifi r turns off
aft r 1 minut .
• Ch ck th Outdoor T mp ratur S nsor r sistanc and
location, as instruct d on th pr vious pag .
• Rotat th Humidifi r Control knob count rclockwis to th
“Off” position, and obs rv wh th r th humidifi r turns off.
If th humidifi r still op rat s in th “Off” position, p rform
th following:
1. Ch ck th wiring diagram for corr ct Humidifi r Control
Installation.
2. R mov th wir s from th “H” t rminals on th
Humidifi r Control. If th humidifi r continu s to op rat ,
r plac th sol noid valv .
• Ensur HumidifI r Control is install d p r instructions in
STEP 1 of th INSTALLATION s ction.

P.O. Box 1467 • Madison, WI 53701-1467
Phon : 800/334-6011 • Fax: [phone]
www.aprilairepartners.com
10009879 3.12
B2205708A
Print d in U.S.A.
© 2012 Aprilair – A division of
R s arch Products Corporation
SYMPTOM
Humidifi r or Humidifi r Control “chatt rs” or clicks On and Off
rapidly.
TROUBLESHOOTING PROCEDURE
• Ch ck for st ady 22 VAC to 30 VAC across th “R” and “C”
t rminals of th Humidifi r Control with a voltm t r.
• Ch ck, with a voltm t r, that th HVAC signal across th
“W” and “C” and “G and C” t rminals of th Humidifi r
Control is a st ady 22 VAC to 30 VAC.
• Mak sur that th Outdoor T mp ratur S nsor wiring is
not running alongsid oth r wir s carrying high voltag
(120 VAC or high r). (Automatic Mod Only)
SYMPTOM
Humidifi r blow r do s not activat during Blow r Activation T st.
TROUBLESHOOTING PROCEDURE
• S t th Blow r Activation Switch to “ON”.
• Ch ck wiring diagrams for corr ct Humidifi r Control
installation.
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