Rotate thermostat knob clockwise to high position. After room reaches
desired comfort level, rotate thermostat knob counter-clockwise until the
thermostat clicks off. (Note that the fan delay will keep the fan running
until the elements cool.) Heater will cycle on and off to maintain room
temperature.
NOTE: The first time you operate the unit, it may smoke slightly.
This is due to the residual cleaning agents used to clean the ele-
ment when the heater is manufactured. This is normal and does
not indicate a problem with the unit. This condition will stop after
the heater has been in operation for a few minutes.
Automatic Fan Delay:
The MWUH5004 has an automatic fan delay.
When the thermostat calls for heat, fan action is delayed momentarily
until the heating elements warm. This prevents the circulation of cold air.
When the heater raises the temperature of the room to the thermostat
set point, the heating element is turned off but the fan will continue to run
until the heating element cools down. This prevents exposing the unit to
residual heat, provides a higher comfort level and prolonged element life.
Thermal Cutout:
The MWUH5004 is also equipped with a thermal
cutout which will automatically shut off the heater in the event of over-
heating. The heater will turn on when the operating temperature returns
to normal. Should the unit overheat and activate the thermal cutout
cycle, the cause of the overheating should be determined before further
operation.
NOTE: If the unit is installed in an area where the temperature is
below 50° F, the fan may cycle on and off until the temperature in
the room rises above 50° F, this is normal and does not indicate a
problem with the unit. As soon as the heater warms the air in the
room above 50°, the unit will cycle normally.
Adjusting Air Flow Direction
You can adjust the direction of air flow by:
A. Turning the unit. If the unit has been installed with a single lag bolt,
as shown in the Figure 6, simply turn the entire unit as needed to
adjust air flow.
B. Tilting the unit. Loosen the bracket screws, tilt the heater to the
desired position, and re-tighten the bracket screws (see Figure 4).
NOTE: To tilt the heater it must be mounted in bottom keyhole slots
of mounting bracket to maintain adequate clearance and prevent
possible overheating.
C. Adjusting the louvers to the desired position.
NOTE: The louvers are designed so they can not be complete-
ly closed. Do not attempt to defeat this feature, damage to the
unit can result.
ADJUSTING HEAT OUTPUT
Heat output can be increased or decreased by switching wires at the
wattage change terminal board. The heater is factory wired to deliver a
heat output of 17,065 BTU per hour. Should your particular application
require less heat output, refer to Table 1 and change the wires at the
wattage change terminal board as shown in Wiring Diagram Fig. 7.
MAINTENANCE
Because of its rugged design, superior engineering, and high-quality
craftsmanship, the MWUH5004 requires little maintenance. With proper
care, your electric heater should last a lifetime, but seasonal cleaning is
recommended to maintain the efficiency of the heater.
Cleaning the Heating Element
To clean the heating element, loosen (but do not remove) the four
Phillips head screws located behind the louvers in the corners of the
louver housing. (See Fig. 8) Grasp the louver housing on both sides, lift
up, and pull out. This provides access to the heating element. Remove
dust or lint with a soft brush or a vacuum cleaner. Replace the louver
housing and tighten the Phillips head screws.
Cleaning the Fan and Motor
Remove the protective grille from the rear of the heater. This provides
access to the fan and motor. Wipe off the fan and motor with a soft cloth
or brush. The fan motor does not require lubrication. Replace protective
grille. (See Fig. 9.)
Figure 6
WARNING
TO PREVENT POSSIBLE ELECTRIC SHOCK, DIS-
CONNECT POWER TO THE HEATER AT THE MAIN
SERVICE BOX BEFORE ATTEMPTING TO ADJUST
THE HEAT OUTPUT OF THIS UNIT.
!
TABLE 1. HEAT OUTPUT ADJUSTMENTS
MAX
FUSE
HEATER
MOVE JUMPERS FROM
BTU/HR
VOLTS
WATTS
SIZE
AMPS
C-D TO A-B
17065
240
5000
30
20.9
NONE
14215
240
4165
25
17.4
BLUE
11365
240
3332
20
13.9
BLUE & YELLOW
8533
240
2500
15
10.4
BLUE, YELLOW & RED
12799
208
3750
25
18.0
NONE
10659
208
3123
20
15.0
BLUE
8533
208
2500
15
12.0
BLUE & YELLOW
6396
208
1874
15
9.0
BLUE, YELLOW & RED
TO PREVENT POSSIBLE ELECTRICAL SHOCK, ALL
POWER MUST BE SHUT OFF AT THE MAIN SERVICE
BEFORE INSPECTING OR CLEANING.
BLK
1
2
3
4
5
6
ELEMENT
HI
LIMIT
FAN
CONT.
7
8
9
10
11
12
C D
A B
WATTAGE CHANGE
TERMINAL BOARD
GROUND
THERMOSTAT
L1
L2
POWER
TERMINAL
BLOCK
FIELD
WIRING
FAN
MOTOR
RD
YL
BLU
Figure 7
WARNING
!
CAUTION
USE CARE TO PREVENT DAMAGE TO INTERNAL
HEATER WIRING WHEN CLEANING ELEMENT.
MAKE SURE ALL CONNECTIONS REMAIN TIGHT
AND ALL WIRING IS ROUTED AWAY FROM ELE-
MENT FINS WHEN REASSEMBLING THE UNIT.
ALLOWING WIRING TO TOUCH THE ELEMENT FINS
COULD RESULT IN A FIRE HAZARD.
!
208/240V - MWUH 5004
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