OPERATING
INSTRUCTIONS
1. Heater must be properly installed before operation.
2. After heater is completely assembled, rotate thermostat knob
counterclockwise until control stops. This is the minimum
heat setting.
3. Turn power supply to heater “ON” at main switch panel.
4. Heater should not operate. If it operates disconnect power
and recheck wiring.
5. Rotate thermostat clockwise until it stops (maximum heat set-
ting).
6. Heater should turn on after a brief delay (see Automatic Fan
Delay below). If heater and fan do not come on, disconnect
power and check wiring.
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.
7. Allow heater to continue to operate until room temperature
reaches desired comfort level. Then rotate thermostat knob
counterclockwise slowly until 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 tempera-
ture.
8. 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 pro-
duce heat. Rotation in the counterclockwise direction will
reduce the amount of time the heater is on.
Automatic Fan Delay:
The FUH Series 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 ele-
ment cools down. This prevents exposing the unit to residual
heat, provides a higher comfort level and prolonged element life.
Automatic Thermal Limit:
FUH Series is equipped with a
thermal limit which will automatically shut off the heater in the
event of overheating. Should the thermal limit activate an alarm
light will be visible on the front of the heater next to the thermo-
stat knob. The heater will turn on when the operating tempera-
ture returns to normal. Should the unit overheat and activate the
thermal limit, 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 indi-
cate a problem with the unit. As soon as the heater warms the
air in the room above 50°, the fan will operate continually until
the thermostat has reached the room set point.
Adjusting Air Flow Direction
You can adjust the direction of air flow by:
1. Turning the unit. If the unit has been installed with a single
lag bolt, as shown in Figure 8, simply turn the entire unit as
needed to adjust air flow.
DO NOT TAMPER WITH OR BYPASS ANY SAFETY LIMITS
INSIDE HEATER.
CAUTION - DO NOT CONTINUE TO ATTEMPT TO USE THE
HEATER IF THE THERMAL LIMIT REPEATEDLY OPERATES.
TO DO SO COULD PERMANENTLY DAMAGE THE HEATER
OR CREATE A FIRE OR SAFETY HAZARD.
4
Figure 8
GND
4
6
5
2
3
1
MOTOR
FAN
2
1
11
12
9
10
8
7
L1
L2
D
C
B
A
ELEMENT
FAN
CONTROL
HI LIMIT
FIELD WIRING
POWER
TERMINAL
BLOCK
THERMOSTAT
WATTAGE CHANGE
TERMINAL BOARD
RED
YEL
BLU
BLK
T
3
T
2
T
1
CONTACTOR
L
3
2
L
2
1
L
1
ALARM LIGHT
Figure 7B - Wiring Diagram FUH724A
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
ALARM LIGHT
MOTOR
RD
YL
BLU
Figure 7A - Wiring Diagram FUH54C
