Generalaire MHX3 User Manual download pdf

WARNING! Do not set relative humidity too high during cold

weather. Over humidification can result in condensation,

structural damage and mold. Condensation within a building's

structure can cause loss of structural strength. Condensation

can also enable mold and mildew growth resulting in personal

injury and damage to building structure and contents.

RESIDENTIAL AIR TREATMENT PRODUCTS

Manual humidistat/dehumidistat

control

II. APPLICATION

The MHX3 control provides low voltage control of most

humidifiers. The humidistat uses a SPDT switch and is designed

for wall mounting in the living area or mounting on the return air

duct.

RANGE: 10% to 85% RH ELECTRICAL RATING: 30 VAC, 60 VA

OPERATING MODES

The MHX3 can be configured for operation as a standard

humidistat or dehumidistat. When using this product as a

standard humidstat terminals C and NO must be used. Use MHX3

face plate for the humidistat version. When using this product as a

dehumidistat terminals C and NC must be used. Use DHX3 face

plate for the dehumidistat version.

I. SAFETY

WARNING! Improper electrical wiring can result in fire,

failure or loss of humidity control. Disconnect electrical

power before installing and servicing. Failure to disconnect

electrical power may result in injury or death. All local

building and electrical codes must be followed.

The MHX3 humidistat must be installed by a qualified technician.

Failure to properly install the MHX3C may result in property

damage or personal injury.

Homeowners must read instructions and understand the operation

of the MHX3 and the humidifier(s) it controls.

Improper operation can result in over or under humidification.

Over humidification can result in condensation, structural damage

and mold. Condensation within a building's structure can cause

loss of structural strength. Condensation can also enable mold

and mildew growth resulting in personal injury and damage to

building structure and contents.

Safety questions regarding the MHX3 may be directed to General

Filters, Inc. Toll free (866) 476-5101

MHX3

WIRING DIAGRAMS

DIAGRAM 1 WIRING 24V. BYPASS HUMIDIFIER

HUMIDIFIER 24V.

SOLENOID VALVE

OR 24V. DRUM MOTOR

727-58

24 V. TRANSFORMER

(OMIT IF POWER SUPPLY

IS 20-30 VAC)

120V. POWER SUPPLY

SWITCHED WITH FURNACE OPERATION

HMX3

Humidistat

USE TERMINALS C AND NO FOR HUMDISTAT

DIAGRAM 2

WIRING HIGH LIMIT HUMIDISTAT WITH ELITE STEAM HUMIDIFIER

STEAM HUMIDIFIER

CONTROL MODULE

HUMIDISTAT

GND

24V

DIAGRAM 3 WIRING 120V. 1137/1000 POWER HUMIDIFIER

HUMIDIFIER CONTROL LEADS

(YELLOW WIRES)

HUMIDISTAT

HUMIDIFIER 24V AUX POWER

(RED WIRES)

(NOT USED, ATTACH WIRE

NUTS TO EACH LEAD)

DO NOT TOUCH TOGETHER!

110V SWITCHED WITH FURNACE HEATING CYCLE

L1 N

HUMIDIFIER

POWER CORD

DIAGRAM 4

WIRING 120V. 1137/1000 POWER HUMIDIFIER

HUMIDIFIER 24V AUX POWER

(RED WIRES)

(NOT USED, ATTACH WIRE

NUTS TO EACH LEAD)

DO NOT TOUCH TOGETHER!

110V CONSTANT VOLTAGE

HUMIDIFIER CONTROL LEADS

(YELLOW WIRES)

HUMIDISTAT

110V SWITCHED WITH

FURNACE HEATING CYCLE

FIELD SUPPLIED RELAY

24V COIL, N.O. 5A MIN.

L1 N

HUMIDIFIER

POWER CORD

727-58

24 V. TRANSFORMER

(OMIT IF POWER

SUPPLY IS 20-30 VAC)

TROUBLESHOOTING -- Humidistat Version

SYMPTOM

DIAGNOSTIC STEPS

Humidifier turns

on and off

repeatedly

1. If mounted on wall, verify wire clearance hole in wall is sufficiently

insulated to preven drafts from affecting the humidistat.

2. If mounted on return air duct, verify humidistat is at least 24”

upstream of humidifiers air discharge.

Humidifier

operates

continuously

1. When the humidity in the home is less than the knob setting on

the humidistat the stat will operate the humidfier until the humidity

is higher. Reduce knob setting.

2. Verify function of solenoid valve.

No humidifier

operation in “ON”

mode

1. Set the thermostat to operate both furnace burner and blower.

Operation may be necessary for system power.

2. Verify terminals 2 and 3 are used on the humidistat. These are the

contacts for humidification.

3. Check voltage at at terminals 2 and 3. There should be no voltage

for an Elite Steam or 1137/1000 power humidifier. Voltage should

be 20-30 VAC from most others.

4. Verify humidifier operation by bypassing the humidistat.

Ideal humidity is

not achieved

1. Technical fault with humidifier. Check water supply, electrical

connnections and condition of the evaporator pad. Verify metering

orifice at the solenoid valve is not obstructed.

2. Humidifier run time is too short. Switch water supply to hot water if

appropriate (use copper tubing).

3. Excess air infiltration. Seal sources of air loss.

4. Humidifier is undersized. Switch water supply to hot water if

appropriate (use copper tubing). Add additional unit(s) or

replace existing unit with a larger unit.

USE TERMINALS C AND NO

FOR HUMDISTAT

DIAGRAM 5

1300 DEHUMIDIFIER

HUMIDISTAT

GENERALAIRE 1300

DEHUMIDIFIER

FORM NO MHX3-06 REV C

WALL MOUNT VERSION

FIG. 1

USE TERMINALS C AND NO FOR HUMDISTAT

USE TERMINALS C AND NC FOR DEHUMDISTAT

III. INSTALLATION INSTRUCTIONS - PRECAUTIONS

The installer must be a qualified technician. Disconnect electrical

power before begining installation. Do not install the humidistat

on the warm air duct. Conduct a thorough checkout before leaving

the installation.

WALL MOUNT INSTRUCTIONS - Humidistat/Dehumidistat

versions

1. Choose a location for the MXH3 about five feet above the floor

on an inside wall with average room temperature and relative

humidity conditions.

2. Drill a small hole in the wall and run low voltage wiring to the

location chosen. Pull about 6” of wire through the hole.

Use the entire mounting gasket (both inside and outside

portions) to seal the wall opening or use foam tape to prevent

drafts from affecting the humidistat operation. (see fig 3.)

3. Remove the knob on the humidistat. Squeeze the top and

bottom of the base to release the face of the humidistat.

4. Mount the base horizontally over the wires. Attach directly to

the wall, using the two screws provided in the slotted holes.

5. Connect the wires to the screw terminals on the control assembly

as shown in wiring DIAGRAMS 1-5 Replace face and Knob.

DUCT MOUNTING ON THE RETURN AIR - WALL BASE

Humidistat/Dehumidistat versions (optional)

Do not install the humidistat on the warm air duct or within 48”

of UV light.

1. Locate the humidistat at least 24” upstream of the humidifier or

bypass on the return air duct. Avoid areas of direct radiation like

secondary heat exchanger in the fan compartment.

2. Cut a square in the duct 2-1/4” wide and 1-3/4” tall. Remove the

inner portion of the mounting gasket and discard. Use the outer

portion to seal between the plastic base and the duct. Line up the

base with the cut out and accurately mark the holes thru the plastic

duct mount

plate. (see fig 3.)

3. Revove the humidistat and drill four 3/32” mounting holes.

4. Place the outer portion of the mounting gaskets on the plastic base

and mount the base with four screws. Low voltage wire may enter

the humidistat under the gasket.

5. Connect wires to screw terminals on the control assembly as

shown in wiring DIAGRAMS 1-5. Replace the face and knob.

DUCT MOUNTING ON THE RETURN AIR - DUCT BASE

Humidistat/Dehumidistat versions (recommended)

Do not install the humidistat on the warm air duct or within 48”

of UV light.

1. Locate the humidistat at least 24” upstream of the humidifier

or bypass on the return air duct. Avoid areas of direct radiation

like secondary heat exchanger in the fan compartment.

2. Remove face by inserting screwdriver into the pry slot and

twisting (see fig. 2)

3. Use the plastic duct mount plate as a template. Accurately mark

and drill the (4) 3/32” mounting holes and cut away the 4-1/4” x 2-1/2”

section of the duct mount plate.

4. Place duct mount base gasket on the humidistat base and mount

the base with four screws. Low voltage wire may enter the humidistat

under the gasket (see fig. 2)

5. Connect wires to screw terminals on the control assembly as shown in

wiring DIAGRAMS 1-5. Replace face and knob.

MHX3 CALIBRATION INSTRUCTIONS

(Accurate humidity gauge required)

1. Use an accurate humidity gauge to determine the current relative

humidity in the room where the humidstat is located. This relative

humidity will be used in step 5.

2. Remove the face plate from the housing.

3. Turn the knob on the MHX3 faceplate to the “on” position

4. Very slowly, turn the knob clockwise until you hear a “click” from

the humidistat control and leave the knob in this position.

5. Turn the ring (not the knob) so that the knob is pointed directly

at the current relative humidity number determined in STEP 1.

6. The humidistat in now calibrated to match you humidity gauge.

1 2 3 4

Summary of Contents

Page 1 - 120V. POWER SUPPLY

WARNING! Do not set relative humidity too high during cold weather. Over humidification can result in condensation, structural damage and mold.

Page 2 - WARRANTY REGISTRATION

Product Information:Serial Number: _____________________________________________________________Model: _______________________________________________

Page 3 - Commande manuelle

PRODUITS DE TRAITEMENT D’AIR RÉSIDENTIELSCommande manuelle de l’humidistat/déshumidistatRSYMPTÔMEÉTAPES DU DIAGNOSTICI. SÉCURITÉMISE EN GARDE! Un câbl

Page 4 - ENREGISTREMENT DE LA GARANTIE

Renseignements sur le produit :Numéro de série : ____________________________________________________________Modèle : _______________________________

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Generalaire MHX3 User Manual

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