KING KFUH User Manual

SAVE THESE INSTRUCTIONS

KFUH Electric Unit Heater

Installation Instructions

“WARNING: RISK OF ELECTRIC SHOCK. CAN CAUSE
INJURY OR DEATH. DISCONNECT ALL REMOTE ELEC­TRIC POWER SUPPLIES BEFORE SERVICING.”

CAUTION: Turn off power source supplying the heater before attempting installation, maintenance or repairs. Lock or tag circuit breaker
or fuse panel door. Failure to do so could result in serious electrical shock, burns, or possible death.

It is extremely important you verify the electrical power supply is the same voltage as the heater being installed. 240 and 480 Volt heaters are not
interchangeable. Powering a 480 Volt unit with 240 Volt supply wires will reduce the heater output by approximately 75% and is never recommended.
Powering a 240 Volt unit with 480 Volt supply wires will destroy the heater and voids all warranties.

CHECK: Ensure blower wheel is free-turning and that element assemblies are in place. Be sure filter is in proper position and not torn or damaged.
Check that blower housing and motor have not separated from element compartment during shipment.

FIELD WIRING

208 and 240 Volt heaters are equipped with circuit breakers over 48 Amps to provide internal circuit protection and a field disconnect on the unit. A
terminal block provides a single strike for field wiring. 480 Volt units do not have circuit breakers but are fused when internal protection is required and
are also supplied with terminal blocks for field wiring. Consult the National Electric Code for proper wire size and service circuit breaker protection.

Ter m in a l B lo c k

1 Phase and 3 Phase

240VAC

L6

L5

240VAC

L4

L3

240VAC

L2

L1

60 Amp

Circuit Breaker

60 Amp

Circuit Breaker

60 Amp

Circuit Breaker

To L im i t C on t ro l s

and

Heater Elements

Low Voltage Thermostat

R

W

G

Y

Furnace Low Voltage

Ter m in a l B lo c k

C

R

W

G

Thermostat Control Wiring diagram

for use with electric furnaces and
showing cooling coil relay hook-up

Transformer

24VAC

Heat Relays

Fan Only Relays

Cooling Coil Relay*

(*provided by others)

Electronic Air Cleaner Wiring diagram

for use with electric furnaces and
utilizing an airflow interlock switch

D

I
M
E
N
S

I
O
N

AIR FLOW AIR FLOW

S

2007 KFUH.indd : 3/08

King Electrical Mfg. Company • 9131 10th Avenue South • Seattle WA 98108 • phone [phone] • fax [phone]

1

Mounting

KFUH heaters can be mounted vertically or
horizontally as shown. 3/8" weldnuts are weld­ed into brackets and will accept 3/8 threaded
rod. A minimum of 6 inches clearance to
vertical and horizontal surfaces and 6 feet
minimum above floor are required. Louvers
can be adjusted for desired airflow.

Application Tips

First, calculate the heating loads in the con­ventional way using the N.E.M.A. handbook or
ASHRAE guide. Next, determine quantity and
size of heaters to be used. In instances where
large groups of people are normally settled
in the same location, use a large number of
smaller kW unit heaters. (Example: people on
a production line or skilled machine opera­tions.) By utilizing heaters in this manner one
can best distribute uniform heat, prevent hot
drafts, reduce potential noise levels and bal­ance the electrical operating demand.
When considering warehouse areas or
storage rooms (where heat distribution and
constant temperatures are less important) use
fewer heaters of higher capacity.
To maintain uniform heat and reduce strati­fied air it is recommended that the total CFM
of the units turn the air over approximately 3
times per hour.

Horizontal Mount

Smaller rooms can be heated by one unit
heater. Where two walls are exposed heaters
should be mounted as shown.
In larger rooms, units should be located so
their air streams wipe exposed walls without

Ceilings under 12 feet

6" Minimum

Clearance

Adustable

Louvers

blowing at them. Units should be located so
that the air stream of one supports that of
another thus setting up a circulatory air move­ment. (Distance between units to be approxi­mately 1½ times published air throw).
Units should not be mounted horizontally in
areas having ceiling heights in excess of 10
to 12 feet.

Vertical Mount

Units should be mounted vertically where
they may otherwise interfere with assorted
material, handling equipment and in high bay
areas. Heaters should be situated to provide
free air circulation. Size and selection of units
should be based on recommended mounting
height.
Unit heaters are frequently used to combat
cold air inrush when loading dock doors are
opened. For such applications, one or more
units should be arranged to blow warm air
vertically in front of opening.

Ceilings over 12 feet

Motor HP

Dual Mounting

Where square footage is large and comfort
essential, both horizontal and vertical installa­tions may best serve your requirements.

Mounting Limitations

KFUH unit heaters should not be used in
potentially explosive atmospheres. The finish
is not intended for direct salt spray exposure
in marine applications or the highly corrosive
atmospheres of swimming pools, chemical
storage bins, etc. Please refer to the factory
for explosion proof or marine application
heater information.
Do not install unit heaters above recom­mended maximum mounting height. Obstruc­tions must not block unit heater air inlet or
discharge. To prevent possible injury heaters
must be mounted at least 6 feet above the floor
to prevent accidental contact with the heating
element or fan blade.

AIR DELIVERY CHART @ .2 static

MOTOR SPEED

Motor Load

230

230

230

Amps

3.4

1.7

3.2

1.7

3.8

1.9

Voltage

1/5

380/460

1/3

380/460

1/2

380/460

Wire Color

Air Volume = Cubic Feet per Minute (CFM)
Air Velocity = Feet per Minute (FPM)

Low Med

CFM FPM

775 570 860 630

1100 810 1250 920
1100 810
1250 920 1540 1130

Red

CFM

Blue

FPM

CFM

1000
1000
1540
1540
1750
1750

High

FPM

735

735
1130
1130

1285
1285

Black

The following accessories and/or options

may have been ordered with your unit.

Model

1E30-910

KFUH-90D

KFUH-RD

KFUH-90RD

KFUH-PTBL

2

Description

24V Wall Thermostat, range 50°- 90°

90 Degree Elbow w/ adjustable louver diffuser

Radial Diffuser

90 Degree Elbow w/ radial diffuser

Kit includes casters and mounting bracket to
create a Portable KFUH (no power cord)

Add Suffi x

-T

-2TS

-SF

-BR

-2S1

-2S3

-DS40

-DS60

-DS80

-DS100

-ND

Description

1-Pole thermostat - factory installed

2-Stage thermostat - factory installed

Summer fan switch - factory installed

Blower relay for remote fan only operation

2-Stage control, 1-Phase models

2-Stage control, 3-Phase models

40 Amp 3-Pole non-fused disconnect switch

60 Amp 3-Pole non-fused disconnect switch
80 Amp 3-Pole non-fused disconnect switch

100 Amp 3-Pole non-fused disconnect switch

No diffuser - 1" duct collar provided on discharge
side for connection to 14" x 14" duct

2007 KFUH.indd : 3/08