Qmark MUH35 User Manual [en, es, fr]
MUH35D
Fan-Forced Unit Heater with
Built-in Thermostat
Installation, Operation & Maintenance Instructions
Specifications
Model No Volts Watts Amps Weight
MUH35D 240 5 kW High 21
3.3 kW Low 14 22 lbs
208 3.7 kW High 18
2.5 kW Low 12
IMPORTANT INSTRUCTIONS
WARNING
WHEN USING ELECTRIC APPLIANCES, BASIC PRECAUTIONS SHOULD ALWAYS BE FOLLOWED TO REDUCE THE
RISK OF FIRE, ELECTRIC SHOCK, AND INJURY TO PERSONS, INCLUDING THE FOLLOWING:
1. Read all instructions before installing or using this heater.
2. This heater is a commercial/industrial product not intended
for use in a residential setting.
3. This heater is hot when in use. To avoid burns, do not let
bare skin touch hot surfaces. Keep combustible materials,
such as furniture, pillows, bedding, papers, clothes, etc. and
curtains at least 3 feet (0.9 m) from the front of the heater.
4. Extreme caution is necessary when any heater is used by or
near children or invalids and whenever the heater is left
operating and unattended.
5. This heater has hot and arcing or sparking parts inside and
is not intended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other combustible
atmospheres as defined in the National Electrical Code are
used or stored. Failure to comply can result in explosion or
fire.
6. Do not operate any heater after it malfunctions. Disconnect
power at service panel and have heater inspected by a reputable electrician before using.
7. Do not use outdoors.
8. To disconnect heater, turn controls to off, and turn off power
to heater circuit at main disconnect panel.
!
9. Do not insert or allow foreign objects to enter any ventilation
or exhaust opening as this may cause an electric shock, fire,
or damage to the heater.
10. To prevent a possible fire, do not block air intake or exhaust
in any manner.
11. Use this heater only as described in this manual. Any other
use not recommended by the manufacturer may cause fire,
electric shock, or injury to persons.
12. This heater is provided with a buzzer that will sound only if
the heater has turned off as a result of overheating. If you
hear the buzzer, immediately turn the heater off and inspect
for any objects on or adjacent to the heater that may have
blocked the airflow or otherwise caused high temperatures
to have occurred. DO NOT OPERATE THE HEATER WITH
THE BUZZER SOUNDING.
13. This heater is not intended for use in special environments.
Do not use in damp or wet locations such as marine or
greenhouse or in areas where corrosive or chemical agents
are present.
14. When installing, see INSTALLATION INSTRUCTIONS for
additional warnings and precautions.
15. For safe and efficient operation, and to extend the life of your
heater, keep your heater clean - See MAINTENANCE
INSTRUCTIONS.
SAVE THESE INSTRUCTIONS
ECR 39423 04/13 5200-11128-000
INSTALLATION
MIN. 8"
TO WALL
MIN. 8"
TO WALL
MIN
8" TO
CEILING
TO WA LL
MIN 8"
INSTRUCTIONS
To prevent a possible fire, injury to persons or damage to the
heater, adhere to the following:
1. Disconnect all power coming to heater at main service
panel before wiring or servicing.
2. All wiring procedures and connections must be in accordance with the National and Local Codes having jurisdiction and the heater must be grounded.
3. Verify the power supply voltage coming to heater matches
the ratings as shown on the heater nameplate.
CAUTION: ENERGIZING HEATER AT A VOLTAGE GREATER
THAN THE VOLTAGE PRINTED ON THE NAMEPLATE WILL
DAMAGE THE HEATER AND VOID THE WARRANTY AND
COULD CAUSE A FIRE.
4. CAUTION - High temperature, risk of fire, keep electrical
cords, drapery, furnishings, and other combustibles at least
3 feet (0.9 m) from front of heater. Do not install heater
behind doors, below towel racks, or in an area where it is
subject to being blocked by furniture, curtains or storage
materials. Hot air from the heater may damage certain fabrics and plastics.
5. To reduce the risk of fire, do not store or use gasoline or
other flammable vapors and liquids in the vicinity of the
heater.
6. When heater is to be wall or ceiling mounted, the anchoring
provisions must be of sufficient strength to support the total
weight of the heater plus the weight of the mounting provisions. Failure to properly secure the supporting members
of the building structure could allow the heater to fall.
7. The following minimum clearances must be maintained:
Bottom of heater to floor - minimum 6’ (1829 mm) maximum height 15’ (4572 mm)
Sides of heater to adjacent wall - minimum 8” (203 mm)
When wall mounted, top of heater to ceiling 8” (203 mm)
When ceiling mounted, back of heater to wall 8”(203 mm)
Clearance in front of heater - 5’ (1524 mm)
8. Do not use this heater for dry out as the paint, plaster, sawdust and drywall sanding dust will permanently damage the
heater and must be kept out of the heater.
General
Location of Heater
This heater has user controls. It may be desirable to reach
these controls after installation.
The direction of air flow should not be restricted by columns,
machinery, etc., and the air flow should wipe exposed walls
rather than blowing directly at them. When more than one
heater is used in an area, the heaters should be arranged so
that the air discharge of each heater supports the air flow of the
others to provide best circulation of warm air.
Ceiling Mount
This heater may be mounted to any ceiling that will support the
weight of the heater. See Figure 2.
CIRCULAR
HOLE
USE CIRCULAR
HOLES FOR CEILING
MOUNTING. DO NOT
USE KEYHOLES.
Figure 2
1. Remove the mounting stand from the heater, then remove
four rubber grommets from stand.
2. Secure stand to structural members of ceiling with four 1/4”
diameter bolts (not provided). In wood joist use 1-1/2” long
lag bolts. In steel beams use machine bolts secured with
nuts and lockwashers. Never use bolts smaller than 1/4”
diameter.
3. Replace the heater in the stand and tighten knobs to lock in
place. Two large rubberwashers go between heater and
stand, one on either side.
TO PREVENT HEATER FROM POSSIBLY FALLING, DO NOT
USE KEYHOLE SLOTS FOR CEILING MOUNT APPLICATION.
Wall Mount
This heater may be mounted on any wall that will support the
weight of the heater. See Figure 3.
KEYHOLE
SLOT
USE KEYHOLES
FOR WALL
MOUNTING
Figure 3
1. Remove the mounting stand from the heater, then remove
four rubber grommets from stand.
2. Secure stand to structural members of wall with four 1/4” dia.
X 1-1/2” long lag bolts (not provided). In masonry walls use
metal expansion shields or toggle bolts. Never use bolts
smaller than 1/4” diameter.
3. Replace the heater in the stand and tighten knobs to lock in
place. Two large rubber washers go between heater and
stand, one on either side.
MOUNTING
HOLES
ARE 16” O.C.
Figure 1
2
Wiring
ELEMENTS FRONT
MIDDLE
REAR
HEAT SW.
HI
LOW
1
2
3
2
3
1
AUTO
FAN SW.
ON
TERMINAL BLOCK
6
4
INDICATOR LIGHT
MANUAL RESET LIMIT
ALARM BUZZER
BLACK
GREEN
BLACK
SUPPLY LEADS
WIRING COMPARTMENT
FAN
DELAY
MOTOR
L1
OFF
CYL
L2
THERMOSTAT
Hardware Needed (See Figure 4)
You also will need the following hardware which you can purchase from your local hardware store or electrical supply house:
• Enough 10 gauge copper wire to run power from the service
box to the heating unit. Copper wire must have a minimum
temperature rating of 60 degrees C. DO NOT USE
ALUMINUM WIRE WITH THIS UNIT.
• Proper wire connectors for your application. (See illustration
that follows.)
Figure 4 - Connectors, cable, and hardware used to wire the MUH35D
For certain applications, conduit may be required. Check local
electrical codes. Also, if you run the wiring in conduit and wish
to be able to turn the heater, be sure to purchase enough flexible
conduit to allow the heater to be turned.
1. Loosen the two screws that secure the wiring compartment
cover to the upper right hand area of the back of the heater
and remove the cover.
2. Attach the cable connector to the cover as shown above and
slide the 10 gauge wire through the cable connector. Pull
enough of the wire through the connector for making the
connections.
3. Connect the field wiring to the heater wiring as shown in
Figure 5 - Wiring Diagram.
4. After connecting the wiring, replace the wiring compartment
cover making sure none of the wires are pinched between
the cover and the heater. Tighten the screws securely.
OPERATING
INSTRUCTIONS
1. Heater must be properly installed before operation.
2. To operate the heater, first select either high or low position
on the heat selector switch, then turn the thermostat knob as
far as it will go in the clockwise direction. The indicator light
will come on and remain on as long as the heater is in the
operating mode.
3. When the room temperature reaches the desired level, slowly
turn the thermostat knob counterclockwise until the thermostat clicks. The indicator light will remain on. The heater will
automatically cycle OFF and ON as needed to maintain
desired temperature.
4. To shut heater off, turn thermostat knob as far as it will go in
the counterclockwise direction until the indicator light is off.
5. The fan selector switch allows continuous or cycling fan operation by selecting either the “ON” or “Auto” position, respectively.
6. It may be necessary to readjust thermostat a time or so until
exact comfort level is attained. Rotation in the clockwise
direction will increase the amount of time the heater will produce heat. Rotation in the counterclockwise direction will
reduce the amount of time the heater is on.
Automatic Fan Delay: This heater incorporates an automatic
fan delay. When the thermostat calls for heat, fan action is
delayed momentarily until the heating element is warm. When
the thermostat is satisfied, the fan continues to operate until the
heating element is cool. This action prevents circulation of cold
air, and avoids exposing unit to residual heat, thus providing
higher comfort level and prolonged element life.
NOTE: For best results, the heater should be left “ON” constantly during the heating season as the thermostat, when properly
set, will maintain the desired temperature. In the full counterclockwise position the heater will remain off until the room temperature drops well below freezing.
How To Reset Over -Temperature Safety Control:
DO NOT TAMPER WITH OR BYPASS ANY SAFETY LIMITS
INSIDE HEATER.
Figure 5 - Wiring Diagram
Your heater is equipped with a manual reset safety thermal limit
control that will automatically turn the heater off and sound a
buzzer to prevent a fire if the heater overheats. This control is
located on front of the heater just above the thermostat and is
marked “PUSH TO RESET”. To reset, allow the heater to cool
then simply push the red button in until it snaps. The heater
should immediately return to normal operation.
CAUTION - DO NOT CONTINUE TO ATTEMPT TO USE THE
HEATER IF THE SAFETY CONTROL REPEATEDLY OPERATES AFTER BEING RESET. TO DO SO COULD PERMANENTLY DAMAGE THE HEATER OR CREATE A FIRE OR
SAFETY HAZARD.
It is important to keep this heater clean. Your heater will give you
years of service and comfort with only minimum care. To assure
efficient operation follow the simple instructions below.
3
ALL SERVICING BEYOND SIMPLE CLEANING THAT
REQUIRES DISASSEMBLY SHOULD BE PERFORMED BY
QUALIFIED SERVICE PERSONNEL.
TO REDUCE RISK OF FIRE AND ELECTRIC SHOCK OR
INJURY, DISCONNECT ALL POWER COMING TO HEATER
AT MAIN SERVICE PANEL AND CHECK THAT THE ELEMENT
IS COOL BEFORE SERVICING OR PERFORMING
MAINTENANCE.
User Cleaning Instructions:
1. After the heater has cooled, a vacuum cleaner with brush
attachment may be used to remove dust and lint from exterior
surfaces of the heater including the grille openings.
2. With a damp cloth, wipe dust and lint from grille and exterior
surfaces.
3. Return power to heater and check to make sure it is operating properly.
MAINTENANCE
INSTRUCTIONS
It is important to keep this heater clean. Your heater will give you
years of service and comfort with only minimum care. To assure
efficient operation follow the simple instructions below.
ALL SERVICING BEYOND SIMPLE CLEANING THAT
REQUIRES DISASSEMBLY SHOULD BE PERFORMED BY
QUALIFIED SERVICE PERSONNEL.
TO REDUCE RISK OF FIRE AND ELECTRIC SHOCK OR
INJURY, DISCONNECT ALL POWER COMING TO HEATER
AT MAIN SERVICE PANEL AND CHECK THAT THE ELEMENT
IS COOL BEFORE SERVICING OR PERFORMING
MAINTENANCE.
User Cleaning Instructions:
1. After the heater has cooled, a vacuum cleaner with brush
attachment may be used to remove dust and lint from exterior
surfaces of the heater including the grille openings.
2. With a damp cloth, wipe dust and lint from grille and exterior
surfaces.
3. Return power to heater and check to make sure it is operating properly.
4
REF.
NO
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2.
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5.
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10.
11.
12.
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24.
Replacement Parts
DESCRIPTION
Guard, Element
Element Assembly
Spring, Element
Spring, Capillary
Switch, Rocker
Grille
Indicator Light
Knob, Thermostat
Thermostat
Limit, Manual Reset
Block Terminal
Bracket, Cover Screw
Cover, Control Comp.
Knob, Stand
Stand, Portable
Washer, Rubber
Blade, Fan
Motor
Case, Back
Bushing, Strain Relief
Wiring Comp. Divider
Wiring Cover Plate
Bracket, Mounting
Fan Delay
PART NUMBER
2504-0011-001
1802-0087-032
5208-0073-000
5208-0072-000
S99814893A000
1402-2154-001
3510-2007-000
3301-2012-001
5813-2018-000
4520-11004-000
5823-0003-001
1215-0291-000
1402-0336-000
3301-2018-000
5210-2000-004
W10814895A000
1210-2000-000
3900-2002-006
1425-2005-002
25221-70011
1614-2000-000
4503-2010-002
1215-2001-002
4520-0010-000
4
2
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