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The Model 400 ApriJaire can be installed on either the supply or return plenum of a forced air handling system and is easily reversible
for installation with right hand or left hand bypass pipe connections. Read complete instructions before mounting the humidifier.
The unit is 15" x 143/8" x 10'. The dimensions and serviceability must be considered when selecting the best location for the unit
WARNING
1. Disconnect electrical power to the furnace before starting
installation. Failure to do so could result in serious injury from
elecbica! shock.
2. Sharp edges may cause serious injury from cuts. Use care when
making plenum openings and handling ductwork.
3.
Hot water temperatures in excess of 125°F. may cause serious
injury from bums. Make sure water supply is shut off before
connecting the water supply.
4. Do not set humidity higher than recommended. Condensation
damage may result
5. Do not connect the transformer of the Model 400 to multi-speed
furnace blower motors or blower motors other than 120 VAC.
Premature component failure may result Use Research Products
Corporation Model SO Current Sensing Relay.
6. Do not set humidity up to recommended levels if there is
condensation on the inside windows of any unheated living
space. Condensation damage may result
7. When installing Humidifier Control on downflow furnace, ensure
blower continues to run after a heat call is satisfied to eliminate
high temperatures from damaging the Humidifier Control.
8. Do not install humidifier where water pressure exceeds 125 psi,
since damage to the unit may result Follow codes in effect
concerning pressure reduction.
CAUTION
,.
Do not install unit where freezing temperatures could occur.
2. Do not install unit or bypass connection on the furnace jacket
3. Do not install unit or bypass connection on a plenum face where
the blanked off ends of the cooling coil restrict air movement
through the humidifier.
NOTE: SIX (6) #8 X 3(4' PLATED HEX HEAD SMS SCREWS (NOT FURNISHED) ARE REQUIRED FOR INSTALLATION.
~
RETURN-
c-
FURNACE ACCESSORY
TERMINAl.S
(10VAMINIMI.».I)
OR
TRANSFORMER
(10VAMINIWMj
SUPPLY
Downflow
~
24 VAC
~SUPPLY
FURNACE
BlOWER
NOFITH,
EAST
NOTE
OAWEST
-
MODEL
IS)
SIM.OfF
(SADIX.E VALVE)
WATER SUPPlY
Upflow
IMPORTANT
WHEN MODB. 00 IS USED:
.DD NOT WIRE TRANSFDRMER
INTO
RJRNACE BLOWER CIRCUIT.
.WIREMDDB.OO ImD "APRllAIRE
HUMIDIRER" CIRCUIT DNLY! DO NOT
INSTALL it TRANSFDRM~
CIRCUIT.
G-
DONOTUSE
EXTERNAL
24 VJC OR
'~VAC
SOURCE.
DAMAGE TO
CO~ENTS
OF HUMIDIFIER
CAN OCCUR.
y
NOTE
N
Horizontal
""'--.
CONNECT
SAFETY
OVERFLOW UNE HERE
~IISIMGPROMICTS-
P.O. BOX 1467 .MADISON,
WI 53701.1467
.Call ~57.88()1
.FAX 608/257-4357
.~uca
For Bet/8r Indoor AIr Quality.
SlOE OF
HOME
OUTDOOR
j
TEMPEAATIH
SENSOR
~
~EXPECTEO
SNON~
-~-
LEAOS 1U
APRILAlRE
TERMINALS
FOR INSTALLATION
IN MANUAl
MODE'. REPlACE OUTDOOR
TEMPERATURE
SENSOR WITH
PlASTIC RESISTOR CASE AND
ATTACH MANUAl ~CE PlATE.
SEE FORM #OPI~
FOR
COMPLETE WIRING INSTRUC-
TIONS, INCLUDED WITH EACH
HUMIOIAER.
SDME FURNACES ARE EnUIPPED Wmi
ACCESSORY
TERMINAlS nIAT CAN BE USED
FOR nlE HUMIDISW. nlE RP MDDB-5I CtJVIENT
~SlNG RElAY (NOT RJ~ISHEDI MAY NOT BE
NECESSARY
IN THIS CASE. CONSUl:! nlE FURNACE
MANUfACruRER'S RECOMMENDATIONS
FOR WIRING.
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