Marley MWUH Installation & Maintenance Instructions Manual
Model No. MWUH
Horizontal / Vertical Unit Heater
(Field Adjustable from 1.9KW @ 208V to 5KW@ 240V
WARNING
Dear Owner,
Congratulations! Thank you for purchasing this new heater manufactured by a division of Marley
Engineered Products. You have made a wise investment selecting the highest quality product in the heating industry. Please carefully read the installation and maintenance directions shown in this manual.
You should enjoy years of efficient heating comfort with this product from Marley Engineered Pr oducts...
the industry’s leader in design, manufacturing, quality and service.
... The Employees of
Marley Engineered Products
Read Carefully - These instructions are written to help
you prevent difficulties that might arise during installation
of heaters. Studying the instructions first may save you
considerable time and money later. Observe the following
procedures, and cut your installation time to a minimum.
TO REDUCE RISK OF FIRE, ELECTRIC SHOCK OR HEATER FALLING:
1. Use minimum 60° copper wire only.
2. Heater air flow must be directed parallel to, or away from,
adjacent walls.
3. Observe wall, floor, and ceiling clearance requirements.
4. All wiring must conform to national and local electrical codes
and the heater must be grounded as a precaution against
possible electrical shock. Heater circuit must be protected
with proper fuses. See Table 1 on page 3.
5. The mounting structure and the anchoring hardware must be
capable of reliably supporting the weight of the heater and, if
used, the mounting bracket.
6. All electrical power must be disconnected at the main service
box before installing, inspecting, cleaning or servicing the
heater. This is a precaution to prevent possible electrical
shock.
7. This heater is
not suitable for use in hazardous locations as
defined by the National Fire Protection Association (NFPA).
This heater has hot and arcing (sparking) parts inside. Do not
use in areas where gasoline, paint, or flammable liquids
are used or stored.
8. This heater is not suitable for use in corrosive atmospheres
such as marine, green houses or chemical storage areas.
9. This heater must be mounted at least 6 feet (1829 mm) off the
floor.
10. This unit only operates on 240 or 208 volts (AC), 60Hz.
Improper installation or failure to follow the procedures outlined in this instruction manual can result in serious electrical
shock.
Installation & Maintenance Instructions
SAVE THESE INSTRUCTIONS
FILE #E21609
1
!
Remember to place a washer on the screws before you insert them
through the holes in the mounting bracket and screw them into the joist.
Tighten the screws enough to securely hold the heating unit with the air
flow pointed in the proper direction.
2. Hanging the Heater
Attach the heating unit to the mounting bracket. Lift the heater up and
into the mounting bracket. The bracket screws, located on each side of
the heating unit, allow the heater to be attached easily to the mounting
bracket by aligning the screws with the keyhole slots in the mounting
brackets. If the heater is to be tilted, it must be positioned in the lower
keyhole slots (see Fig. 4). Tighten the bracket screws with a wrench so
the unit is securely suspended at the desired horizontal or vertical level.
3. Connecting the Power
To connect the power to the heater, simply remove the screw from the
front of the unit. This allows the hinged bottom to open, providing access
to the electrical wiring and connectors. (See Fig. 4)
Attach the cable connectors to the unit (See Fig. 1) and slide the 10
gauge wire through the cable connector. Pull enough of the wire through
the connector so you will have enough wire to work with when you make
the connections.
NOTE: Wiring compartment volume = 370 in3(6063 cm3)
Connect the wire to the power terminal block located in the base of the
heater (See Fig. 5).
NOTE: To decrease the heat output of the heating unit, see
Table 1 and wiring diagram on page 3.
Turn on the power at the main service.
OPERATION
Setting the Thermostat
INTRODUCTION
Your new heater has unmatched operating flexibility, designed to meet
a variety of heating requirements by simply switching a few easily
accessible wires located in the base of the unit. With heat output ranging from 6,396 to 17,065 BTU’s per hour, this unique feature lets you
use a single unit to meet a wide range of heating applications.
This manual shows you how to install, operate, and maintain your
MWUH5004 electric heater.
Hardware Needed
You will need the following hardware for installation:
• Enough 10 ga. min. insulated copper conductor (with ground)
wire to run power from the breaker/ fuse to the heater. Only use
copper wire rated at least 60°C. Do not use aluminum wire with
this unit.
• Proper size fuses or circuit breakers in accordance with the
National Electrical Code. Also see Table 1, page 3.
• Wood Screw, 3/8" x 2" (9.5 mm x 50 mm) Lag bolts (Qty. 1 or
2).
• Washer, 3/8" (9.7 mm) (Qty. 2)
• Wire connectors sized to your application.
NOTE: For certain applications, conduit may be required (see Fig.
1). 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.
FINDING THE BEST LOCATION
FOR YOUR HEATER
The heater should be installed out of traffic areas and at least 6' off the
floor. The direction of air flow should not be restricted (ie: by columns or
machinery) 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,
as indicated in figure 2, below.
Mounting Height
See Specifications, page 4.
Distance from Walls
See Specifications, page 4.
1. Mounting the Bracket
Locate a joist in the ceiling and attach the mounting bracket to the ceiling joist as shown in figures 3-A or 3-B. You will need to remove the
mounting bracket from the heating unit by loosening the bracket screws
with a wrench and slipping the handle off over the screw heads.
Connectors, cable, and hardware used to wire the MWUH5004
Figure 1
Figure 3-A
Figure 3-B
Single-Screw Mounting
Double-Screw Mounting
Figure 2
Conduit
Conduit
Connector
Flexible Conduit
Flexible Conduit Connector
Flexible NM Cable
Flexible NM Cable Connector
Figure 4
REMOVE SCREW TO OPEN DOOR
USE BOTTOM KEYHOLE
SLOTS IF HEATER IS
TO BE TILTED DOWN
Figure 5
2
CEILING JOIST
WASHER
3
/8" DIAGONAL
LAG BOLT
BRACKET
CEILING JOIST
WASHER
3
/8" DIAGONAL
LAG BOLT
BRACKET
POWER
BLOCK
BLACK
GREEN
(or Bare Copper)
BOTTOM
VIEW
TERMINAL
L2
WHITE
L1
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