King Electric Model KFUH - Manual (Page 3)

3
CONTROL WIRING
Connect thermostat to terminals R and W for heating, R and G for air only. This can be done with a single stage heat-
cool thermostat or a single stage heat-only thermostat and a separate fan-only switch to control the fan-relay (optional)
installed on furnaces. Some models of furnace have two stage operation (optional) and are provided with terminals W1
and W2. If a single stage thermostat is used it should be connected to terminals R and W1 and a jumper wire installed
form terminals W1 to W2 (see enclosed control circuit wiring diagram). Some models of furnace have the 24 VAC power
available between terminal C and R for use with external air conditioning relay option. Never short or cross these two
terminals! The transformer will fail.
OPERATION
When control thermostat is turned up to demand heat the blower and heating elements should be energized. Furnaces
with sequences installed will have up to 30 seconds delay in start-up. When turned to cool position heat-cool thermostats
should bring on the blower only for air only.
MAINTENANCE
"CAUTION" Disconnect power at the main service panel before inspecting or cleaning this heater.
Lock or Tag breaker to prevent accidental shock.
Because of its rugged design, superior engineering and quality craftsmanship the King KFUH Unit Heater requires
little maintenance. With minimum care your electric heater should last a lifetime. King recommends changing the air
intake filter at least twice a year and checking the motor and blower for excessive dust / lint accumulation to maintain
the efficiency of the heater. While King recommends the filter be changed twice a year, your environment may require
more frequent changes.
WARRANTY
The King KFUH unit heater is warrantied against defects in workmanship and materials for five years from date of
installation. Extended warranty applies to heating element only; all other components are covered for two years. This
warranty does not apply to damage from accident, misuse or alteration; nor where the connected voltage is more than
5% above the nameplate voltage; nor to equipment improperly installed, wired or maintained in violation of this instruction
sheet. All claims for warranty work must be accompanied by proof of the date of installation. The customer shall be
responsible for all costs incurred in the removal or reinstallation or products, including labor costs, and shipping costs
incurred to return products to King Manufacturing. King, will repair or replace, at our option, at no charge to you with
return freight paid by King. King shall not be liable for consequential damages arising with respect to the product, whether
based upon negligence, tort, strict liability or contract. No other written or oral warranty applies, nor any warranties by
Representatives, Dealers, Employees of King or any other person. King Manufacturing can be contacted in Seattle,
Washington U.S.A. by phone at (206) 762-0400, fax (206) 763-7738 or website www.king-electric.com.
2007 KFUH.indd : 3/08
TROUBLESHOOTER
TROUBLE POSSIBLE CAUSE REMEDY
Unit will not start
Motor will not stop
Unit goes off on high limit
Vibration noise
Unit has a buzzing sound
when not in use
Unit continues to heat after
room is up to set temperature
- does not shut off
• Thermostat wire is not connected
• Circuit breaker is off
• 24 Volt transformer burned out
• Wire connection off or there are
broken wires
• Reset button tripped
• Wrong voltage
• Repair
• Reset
• Replace
• Repair or replace
• Reset
• Check the power source
• Defective sequencer or contactor • Replace
• Dirty air filter
• Defective sequencer
• Defective limit control
• Power failure
• Replace
• Replace
• Replace
• Reset manual limit push
button 20-35 kW units
• Blower assembly loose • Secure blower and motor cage
• Low voltage transformer
defective or loose
• Replace or tighten
• Defective sequencer
• Defective thermostat
• Thermostat wires to ground
• Motor wires to ground
• Thermostat accidentally shorted
& contacts are welded • Replace
• Replace
• Repair
• Repair
• Replace
- Make sure all connections are tight